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Nov'. 5,1946.
R. E. cRocKETT
2,410,601
MAGNETIC sEPARAToR
Filed Nov. l2, 1940
.
nu wun
Y
5 Sheets-Sheet l
Nov. 5, 1946.
R'. E. cRocKET'r
-2,410,601
MAGNETIC SEPARATOR
Filed NOV. l2, 1940
mm.
3 Sheets-Sheet 2
R. E. CROCKETT
ì 2,410,601
MAGNETIC SEPARATOR
Filed Nov. l2, 1940'
3 Sheets-Sheet 3
Patented Nov. 5, 1946
2,410,601.
MAGNETIC SEPARATOR
Robert E. Crockett, rompton Lakes, N. J., as
signor to Dings Magnetic Separator Co., Mil
waukee, Wis., a corporation of Wisconsin
Application November 12, 1940, Serial No. 365,183
17 Claims. (Cl. 209-225)
My present invention relates in general to im
provements in the art of separating mixed solids
h_aving different characteristics, and relates more
specifically to various improvements'in the con
struction and operation of magnetic separators
ofthe type shown and described in my prior
Patents No. 2,003,430, granted June 4, 1935, and
No. 2,090,112, granted August 17, 1937.
An object of the present invention is to provide
2
To provide improved mechanism for effecting
final separation of the ingredients from each
other and from the advancing conveyor, and for
expressing excess moisture from the finally sepa
rated product.v
»
To provide other improvements in magnetic
separator structures, whereby the cost of con
struction and operation thereof is reduced to a
minimum, while the efliciency Vis enhanced to a
a new and useful magnetic separator, which is 10 maximum.
simple in construction, fiexible in adaptation, and
highly efficient in operation.
Some of the more specific objects of my present
invention are as follows:
To provide various improvements in the con
These and other objects and advantages of the*l
invention will be apparent from the following
detailed description.
A clear conception of the several features con
15 stituting my present improvements,'and of the
struction of magnetic separators of the general
construction and operation of magnetic separa
type shown in my prior patents above referred
tors embodying the same, may be had by referring
to, whereby the operation of such machines and
to the drawings accompanying and forming a
the adaptability thereof to effectively meet var
part of this specification wherein like reference
ious conditions, are vastly improved.
20 characters designate the same or similar parts
To provide an improved separator of the class
in the various views.
wherein magnets coacting with one side of a trav
Fig. 1 is a part sectional side elevation of one
elling conveyor such as an endless belt, effect
of the improved magnetic separators, showing
separation of magnetic from non-magnetic mixed
a longitudinal vertical section through the feed
particles brought in proximity to the opposite 25 and separating zones; ,
face of _the advancing conveyor, and which is
Fig. 2 is a part sectional end view of the sepa
compact and durable in construction and auto
rator of Fig. 1, the section through the lower
matic in operation.
structure having been taken along the line 2_2;
To provide improvements in the construction
Fig. 3 is an enlarged fragmentary section
and operation of the magnet assemblages for 30 through the pole-piece of one of the magnets in
magnetic separators having magnets of consider
the pick-up tails and concentrates section of the
able bulk and which are normally exposed to
machine;
moist and gritty surroundings, whereby such
Fig. 4 is a similarly enlarged fragmentary sec
magnets may be readily assembled and handled,
tion through the pole-piece of a magnet in the
and are thoroughly protected against damage 35 middlings section of the machine;
A
from moisture and grit.
Fig. 5 is a somewhat enlarged longitudinal sec
To provide improved means for safeguarding
tion through a special feed tray or chute for
and for'prolonging the usefulness of the material
initially introducing the mixed materials to the
transporting conveyor or belt of a magnetic sep
arator or similar assemblage. ‘
To provide improved instrumentalities for feed
ing mixed materials to the advancing conveyor
of a magnetic separator or the like, and for in
suring most effective separation and removal of
the products from the zone of separation.
To provide improved control means for regu
lating the supply of material to be treated to,
and the discharge of treated product from, the
separating zone of a magnetic separator or simi
lar assemblage.
To provide improved means for controlling-the
delivery of liquid to a magnetic separator of the
` type wherein separation is effected in the pres
ence of liquid, and for most elîectively subjecting
the material to the hydraulic action.
machine;
.
Fig. 6 is a transverse section through the tray
of Fig. 5, taken along the line 6_6;
Fig. '7 is an enlarged transverse section through
a fragment of the magnet and conveyor belt,
showing one of the vertically and laterally ad
justable baffles;
Fig. 8 is a side view of the assemblage of Fig. '7,
showing the baffle in section;
Fig. 9 is an enlarged fragmentary part sectional
side view of the liquid control and injecting mech
50 anism associated with the separating zone of the
machine;
Fig. 10 is a transverse section through the as
semblage of Fig. 9, taken along the line Ill-l0;
Fig. 11 is a diagrammatic part sectional side
elevation of a modified hydraulic magnetic sepa
2,410,601
4
rator, the section having been taken longitudi
nally through the lower portion of the assem
binge;
Fig. 12 is a transverse section through the ma
chine of Fig. l1, taken along the line I2--I2; and
Fig. 13 is a fragmentary top view of one side
of a modified type of feed tray somewhat similar
to that of Figs. 5 and 6.
While the various improved features constitut
be suspended from the main frame 32 of the
machine, by means of eye-bolts 33 and removable
cross-beams 34 in such manner that the lower
catenary stretch of the belt 20 willv travel closely
adjacent to the pole-pieces I6, l1 but will not
actually touch the same due to the injection of
flushing and lubricating liquid between the belt
and pole-pieces. The conveyor belt 20 may be
of any desired width and formed of durable rub
ing my present invention have been shown and 10 ber impregnated fabric, and the opposite longi
tudinal edges of the lower belt stretch may be
described herein as being especially applicable to
caused to coact with rubber sealing strips 35 se
hydraulic magnetic separators for magnetic ore
cured to the lower edges of the side plates 29 as
and of the type shown in my prior patents, it is
shown in Figs. 2 and 7. Lubricating and flushing
not my desire or intent to thereby unnecessarily
restrict the scope of the invention or the utility 15 liquid, preferably clean water, may be admitted
to the area between the lower belt stretch and
and possible application of the improved struc
the surface I9 and «between the strips 35, by means
tures- to other types of separators.
_
of a pipe 36 having orifices therein, as indicated
Referring to Figs. 1 to l0 inclusive of the draw
in Fig. 1, and this liquid after being drawn under
ings, the improved magnetic separator shown
therein, comprises in general an elongated arcu 20 the magnet face between it and the belt, eventu
ally flows outwardly between the belt 20 and
ate bank of material agitating magnets I5'hav
strips 35 and prevents gritty particles from reach
ing lower pole-pieces I6, I1 the bottom faces of
ing the surface I9.. The belt idler pulley 2| is
which cooperate with spacers I8' to provide an
mounted upon a shaft 31 near the lower feed end
approximately catenary shaped curved lower sur
face I9; an endless non-magnetic conveyor or 25 of the frame 32; and the driving pulley 22 which
beitv 20 supported by pulleys 2 I, 22, and having
coacts with the higher discharge end of the belt
its lower stretch movable along and in close prox
imity to the magret surface I9: an adjustable
chute or tray 23 for feeding a. mixture of mag
20, is mounted upon a driving shaft 38 which may
be adjustable by means of adjusting bolts 39 as
shown in Fig. 1, and may be rotated from any
netic and non-magnetic particles to the lower 30 desirable source. Since the lower stretch of the
belt 20 is constantly passing through liquid and
face of the belt 20 and into the magnetic field of
may be moist and slippery when approaching the
the magnets I5; means including spray pipes 24,pulley 22, this driving pulley 22 is preferably
25 for subjecting the material within the sepa
formed with a plurality of parallel slats 46 on its
rating zone to a needle spray washing and jetting
surface, forming intervening grooves along which
action, the latter to break up mass magnetism;
and means for effecting final separation and
liquid may escape. With this construction, liquid
grading of the treated product.
adhering to the inner face of the belt 20 will be
pressed into the intervening grooves by contact
The magnets I5 which may be of any desired
of the belt with the slats 40, and this removal of
width, are of relatively well known structure, and
alternate magnets of the series preferably are of 40 liquid will enhance the traction and will prevent
slippage.
like polarity, while the intermediate magnets are
Supported upon the main frame 32 beneath the
of opposite polarity, in order to provide successive
magnetic fields having reversed polarity which`
belt and magnet assemblages, is a series of hop
will agitato the magnetic particles passing there
pers 4I, 42, 43, 44, of which the hopper 4I is a
through, to the maximum extent. As shown in 45 tailings collector, the hopper 42 is a middlings
receptacle, the hopper 43 is a dewatering cham
Figs. 1 and 3, the magnets I5 at the feed and
discharge ends of the separating zone, are pro
ber, and the hopper 44 is a concentrate discharge
chute. These hoppers may be adjustably sus
vided with relatively narrow pole-pieces I9 and
are of greatest intensity since the magnet cores
pended from the frame 42 by means of jack
26 are rather heavy; whereas the magnets I5 at 50 screws 45, and the tailings hopper 4I has a feed
the middlings section of the separating zone, are
spout 46 at one end within which an independent
provided with wider pole-pieces I1 and are of
feed tray 23 is adiustably confined, and is pro
lesser intensity because the cores 21 are relatively
vided with liquid overflow compartments 41 at
light, as shown in Figs. l and 4. All of the mag
its opposite sides, see Figs. 1 and 2. The hop
nets I5 are preferably housed directly within a 55 pers 4I, 42 are normally filled with liquid 48 to
liquid-tight casing 28 formed of sheet metal such
the levels indicated in Fig. 1, and excess liquid
will flow over dams 49 disposed between the hop
as copper or stainless steel, and the cores 26, 21
and their energizing coils are preferably sealed
per 4I and the compartments 41; and each of
within the casing 28 and are immersed in oil or
these liquid ñlled hoppers may be divided into
the like. The enclosing casing 28 is protected at 60 two laterally adjoining sections each of which
the bottom by the spacers I8 which may be
may be provided with a special material dis
charge spigot 50 such as shown in Figs. l and 2.
formed of wood or the like, and the opposite sides
of the casing 28 are likewise protected by heavy
Each spigot 50 may consist of an outer sleeve 5I
Wooden or other non-magnetic slabs or plates 29.
secured to the bottom of the adjacent hopper 4I,
The top of the magnet bank has a. curved backing 65 42; a flexible and elastic tube 52 confined within
plate 30 firmly «but detachably secured thereto in
the sleeve 5I and protruding from the lower end
thereof; and a gate 53 swingably suspended from
any suitable manner, and this curved reenforcing
the sleeve 5 I and being swingable across the lower
plate may be formed of suitable metal and is
provided with a central longitudinal stiffening
sleeve end to kink or compress the tube 52 near
and suspension rib 3I which may be pierced by 70 its lower end and to thereby throttle the dis
charge, more or less. In order to completely shut
openings to facilitate suspension and handling of
off the discharge of material and liquid, the
the magnet bank.
'
gates 53 may be swung to positions directly be
As previously indicated, the lower curved sur
face I9 of the magnet assemblage is approxi
neath the sleeves 5I, thereby bending the tubes 52
mately a, catenary curve, and the magnets I5 may 75 which may be formed of rubber, to right angle
_
‘
2,410,601
5
6
position. The overiiow compartments 41 may be
provided with lower liquid discharge passages 54,
and the dewaterlng hopper 43 may likewise be
provided with a liquid discharge pipe 55.
25 also have pin holes 1| therein, and are as
sociated with a common plate 15 which is also
adjustably suspended from the wooden side plates
by bolts 13 coacting with slots 14. vLiquid under-
'I'he raw material feed chute or tray 23 for de
pressure may be supplied .t0 the pipes 24, 25
through flexible conduits 16 successive ones of
which may be located on opposite sides; and the
uid 48, may be constructed either as shown in
end of each pipe 24,. 25 remote from the inlet
Figs. 5 and 6, or as illustrated in Fig. 13; and this
thereof, is preferably provided with a valve con
tray 23 ls preferably made -swingably adjustable 10 trolled orifice 11 for. indicating the pressure
as shown in Fig. 1, by means of adjusting rods
within the pipe, and hence the intensity of the
56 coacting with the lower end of the tray. 'I'he
jets issuing from the holes 1| thereof. These
interior of the tray may be rubber lined, and as
needle jets-are directed at approximately right
shown in Figs. 5 and 6, the tray is divided by
angles to`the face of the belt 28 to ‘break up mass .
livering the mixed magnetic and non-magnetic
particles to the separating zone beneath the llq
partitions 51 into a central valley extending lon
gitudinally thereof beneath the belt 28, and two
opposite side channels 58 located outwardly be
yond the path of the belt. 'I‘he central valley
formed by the >partitions 51 may either be free
15 magnetism, thus permitting most- effective re
lease of entrained waste materials, and the plates
12, 15 serve to 'prevent magnetic particles which
may be dislodged by the jets, from falling out of
the magnetic ñeld or zone of separation. “The
from obstructions as in Fig. 1, or it may be prof 20 open spaces between successive spray baflles 12
vided with one or more ñow retarding riilies 59,
allow the- immediate discharge of waste or mid
60, 6| as in Figs. 5 and 6; and liquid may be sup
plied to the channels 58 by supply pipes 62 either
` as in Figs. 1 and 2 or as in Figs. 5 and 6.
dling material >to the hoppers below.
It is desirable to remove at least the greater
The
portion of the liquid from the concentrates, be
-side channels 58 may either' be unobstructed as 25 fore the latter are discharged into the hopper 44,
Y shown in Figs. 5 and 6; or they may be spanned
by high dams 63 as in-Figs. 1 and 2; or they may
be sub-divided into divisions as in Fig. 13, by
-means of barriers 64. These several modified
types of feed trays may be used advantageously- 30
_under diiferent conditions of operation.
The interior of the tailings and middlings hop.V .
pers 4|, 42, adjacent to the zone of separation
and beneath the liquid 48, is preferably provided
and ín order to express this liquid, a roller 18 sus
pended from the lower ends 0f side links or arms
19, is provided. This( roller 18 may be formed of
soft rubber or the like, and is pressed against the
lower face of the belt 20 by means of adjustable
springs 80 coacting with the swinging ends of
the arms 19 and with the wooden side plates 29.
The upper ends of the suspension links 19 are ad
justably pivotally confined in slotted plates 8|
with a series of baliies 65 having their upper ends 35 also secured to the side plates 29, and the roller _
directed toward the feed end of the machine, and
18 may thus be adjusted forward-1y 4or. rearwardly
some or al1 of these baffles 65 are preferably
and may be caused to engage the belt 20 with
mounted for both vertical and lateral adj'ustment.l
more or less pressure due to the adjustability
In Figs. 7 and 8 is shown a means for effecting
of the springs 80. The liquid expressed'from the
such adjustment, and each of the baffles 65 may 40 concentrates advancing with the belt 28, drops
be suspended from side arms 66 having slots 61
into the dewatering hopper 43, land in order to
therein coacting with studs 68 secured to the
'insure proper delivery of the ñnal concentrates
magnet side plates 29„the studs 68 being pro
into the hopper 44, an adjustabledividing plate
vided with clamping nuts ‘69. With this assem
82 such as shown in Fig. 1 may be employed. This
blage, the baffles 65 may obviously be independ 45 dividing- plate 82. is suspended from a> cross-rod
ently adjusted toward'or away from the belt 28,
83 which is rotatably adjustabIe in cross-heads
or forwardly or rearwardly relative to the feed>
84, and the cross-heads 84 are vertically adjust
end of the machine, in order to secure most ef
able in slides 85 which are bodily movable along
fective separation. In addition to the bail‘les 65
horizontal angle irons 86 at the opposite sides of
spanning the separating zone, barriers 18 may 50 the machine. With such an assemblage, the di
be provided between thehoppers 4| ,` 42 beyond
viding plate 82 may be adjusted horizontally, ver
the opposite sides of the belt 28, see Fig. 1, and
tically, and angularly in order'to `insure most
these barriers should also be made vertically and
effective discharge of the final product. The
laterally adjustable.
plate 82 may be replaced bya somewhat simpler
In order to obtain thorough washing of the 55 dividing plate 81 adjustably supported on side
particles as they are conveyed along the separat
angle bars 88 as shown in Fig. 1l, and the plate
ing zone by the belt 2li-and while being agitated
81 may be- used either alone or'in conjunction
by the magnets »|5, I have provided improved
with a plate 82. The dividing plate 81is pref
Àmeans for subjecting the- conveying surface oi'l
erably adjustably disposed in a zone starting mid->
the belt to pin sprays of liquid. This'improved 60 way between the last two poles and terminating >
spray means comprises a series'of transverse liq
just beyond the last pole-piece Vlli as shown in
uid supply pipes 24 located between some of the ‘
bañles 65 in the tailings hopper 4| and between
others of the baiiies 65 in the front part Vof the
Fig. 11.
'
The oil ñlled magnet housing 28 may be pro
vided with an oil gage 89 near the highest end
middlings hopper, and a subsequent group of 65 of the magnet bank and the oil may be positivelyr
liquid supply pipes 25 near the concentrate dis- A circulated through the casing 28 for cooling pur
charge zone, see Figs. 1, 2, 9 and 10. Each of
poses, and in order to remove heavy liquid such
the individual liquid supply pipes 24 has a series
as Water or moisture from the atmosphere which
of pin holes 1| therein,_and is provided with a
may accidentally enter the magnet housing 28, '
transverse plate 12 disposed approximately par 70 I provide one or more depressions 90 in the low-l
allel to the adjacent belt 20, and these pipes 24
est portion of the casing 28 in which such heavy
and their plates 12 are adjustable toward and
liquid may accumulate beneath the oil, see Fig.
away from the belt 20 by means of bolts 13 coact
10. Pipes 9| the upper ends of which are normal
ing with the magnet side plates 29 and with slots
ly capped, have their lower ends disposed iny these
14 in the plates 12, see Fig. 9. All oi' the pipes 75 depressions, and upon removal of the closure caps,
2,410,601
siphon tubes 92 may be applied to the upper pipe
ends in order to remove the accumulated water.
Since the static oil pressure within the casing 28
is much greater than that of the liquid outside,
any leakage of oil from within will prevent other
liquid from entering the casing and damaging the
coils, and such oil leakage may be readily de
8
concentrates are being conveyed over the trough
plate l5 they are finally subjected to a thorough
washing and desliming action by the jets 25 be
fore being subjected to the press roller 18. The
roller 18 expresses most of the residual liquid, and
the final high intensity magnets also remove some
_ of the liquid, so that the final concentrates deliv
tected with the gage 89. In order to insure more
ered into the hopper 44 over the diverter plate 82,
effective lubrication and expulsion of gritty ma
are in relatively drycondition. The final high
terial from between the belt 20 and seal strips 35, 10 intensity magnets are designed also to carry the
I may also provide a series of fresh water supply
magnetic material across the dewatering hopper
pipes 93 as shown in Figs. 11 and 12. These pipes
43 without loss of mineral. It will therefore be
92 extend through the magnet bank to the slight
apparent that the separation of the tailings and
space between the surface I9 and belt 20, midway
middlings from the concentrates is effected au
between the sealing strips 35, and each pipe 93 15 tomatically and continuously, and the concen
may be provided with a control valve 94 for regu
trates may be effectively dewatered before ñnal
lating the quantity of liquid admitted.
discharge thereof.
While the machine shown in Figs. l and 2 is
relatively standard and adapted to meet a broad
While the operation of the machine shown in
Figs. 11 and 12 is quite similar to that just ex
range of separation problems, it may in some 20 plained, this modiñed assemblage is adapted to
cases be possible to omit the middlings production
retain all material within the zone of magnetic
and reduce the size and weight of hoppers, by
influence for a longer» period of time. The mix
using a simplified thin trough such as shown in
ture of liquid and solids delivered to the separat
Fig. 1l, which would be particularly applicable to
ing zone by the feed tray 23 in this improved
line material having the gangue separated as by 25 machine, is compelled to travel along a laterally
crushing. In this modified magnetic separator,
and entirely enclosed flat conduit 95 and is thor
curved troughs 95, 96 are disposed forwardly and
oughly subjected to the magnetic influencé which
'rearwardly of the tailings hopper 9T and closely
permeates the entire interior of this conduit, until
adjacent to the .lower face of the conveyor belt
the material reaches the open hopper 91. Here
20. The feed tray 23 is adapted to deliver the 30 the tailings and non-magnetic materials are_remixture of liquid and solids directly into the sep
leased and drop into the hopper, whereupon the
arating zone at the forward end of the trough 95,
concentrates are carried into and along another
and the tailings hopper 9'! is in open communica
laterally enclosed conduit formed by the trough
tion with the confined spaces between the troughs
96. In this latter conduit, the concentrates are
95, 96 and the belt 29 at the rear end of the trough 35 finally thoroughly washed and deslimed by the
95 and the front end of the trough 86. Water jet
relatively strong needle jets of fresh liquid de
injection pipes'24I 25 may be provided along the
livered from the pipes 24, 25, and the final con
rear trough 96 for the purpose of thoroughly
centrates are thereafter dewatered and dis
, washing the concentrates, and dewatering and
as previously described.
concentrate collecting hoppers 43, 44 are provided 40 charged
It will thus be noted that the improved mag
at the delivery end of the trough 96. This modi
netic separators are adapted to automatically
fied assemblage may also be provided with a de
and effectively remove magnetic from non-mag
watering roller 18, a magnet suspension plate 39,
netic materials, and to deliver the concentrates
and special feed troughs, such as previously de
45 in relatively dry condition. The improved mag
scribed.
net structure wherein the magnets are confined
During normal operation of the improved mag
in
oil within a complete enclosure such as the
netic separator shown in Figs. 1 and 2, the con
housing or casing 29, and are provided with re
veyor belt 20 is being constantly driven at an ap
movable pole-pieces I6, I1, permits removal and
propriate speed in the direction indicated by the
arrow in îF’ig. 1, the magnets I 5 are energized, and 50 replacement of these pole-pieces without disturb
ing the concealed magnet parts. The curved
material and liquid are being delivered in regu
backing and suspension plate 3l) for the magnet
lated quantities through the feed tray 23 and
bank reenforced by the spine or spines 3|, not
the various supply pipes. As the material ad
only provides strong means for facilitating han
vances along the separating zone the magnetic
solid particles are drawn upwardly against the 55 dling and convenient suspension of the magnets,
but also enables the magnet cores 26, 21' to be
lower face of the belt> 20 by the magnets l5, and
properly disposed approximately perpendicular to
the tailings or non-magnetic particles are quick
the lower stretch of the belt 20. While the mag
ly removed by the washing and jetting action and
nets are quite-effectively cooled by the fresh
the bailles 85 which may be set to insure such
prompt removal. The opposite polarity of the 60 water admitted to and circulating through the
machine, the oil within the enclosing casing 28
successive magnets causes the retained magnetic
may also be circulated to enhance the cooling
particles which adhere to and advance with the
leffect„and Water which may enter the casing 28
belt 20, to be thoroughly agitated, and as this
may be readily removed with the aid of the siphon
retained material passes over the spray pipes 24
it is subjected to thorough Washing and agitation 65 tubes 9|, 92. The use of the sealing strips 35
coacting with the belt 20, and the admission of
by the high intensity needle jets issuing from the
fresh liquid to the surface I9 either through an
orifices 1I. Other non-magnetic material is thus
end pipe 39, or several pipes 93, provides simple
removed from the belt 20 by the jets, and the open
and eiîective means for cooling the magnets thus
spaces between jets and the adjacent baffles 65
quickly direct this other material into the ho-p 70 allowing -the use of higher currents andA conse
quently obtain stronger magnetic fields, and for
pers 4I, 42. As the belt proceeds over the mid
dlings hopper 42, some material containing mag
keeping grit away from the belt surfaces. The
netic particles may be washed from the magnetic
ribbed pulley 22 insures proper driving of the belt
separating zone, and these middlings may be
20 and avoids undesirable slippage, and the belt
treated for subsequent separation; and when the 75 supporting pulleys 2|, 22 can be readily adjusted
’ 2,410,691
9
,
to position the lower belt stretch in snug engage
^
10
p
thereof, a roller resiliently engaging said opposite
' ,
side -of said conveyor near the discharge end of
The improved feed trough 23 is angularly ad
the field for expressing moisture from» the con
justable to insure most effective deliveryl of the
centrates within said field, means for removing ,
feed to the separating zone, and by utilizing _bar 5 material from said conveyor beyond said roller,
riers or riiiies 59, 60, 6|, the feed can be retarded
and a diverter plate coacting with said conveyor
as it enters the zone of separation and the solid
near the delivery end of said field beyond said
particles are forced to flow upwardly toward the
roller.
belt. The provision of the side chutes 58 with
4. In'a separator, an endless conveyor, a series
barrier partitions 64 therein for returning spillage 10 of magnets on one side of saidconveyor for cre
to the separating zone, prevents loss of magnetic
ating a magnetic field along the opposite side
particles with the tailings, and the adjustability
thereof, a resilient roller swingably suspended
of the baffles 65 also enhances the efficiency of
from said magnets near the discharge end of the
separation by quickly removing the non-magnetic
field and resiliently engaging the opposite side of
particles from the separating zone. The im 15 said conveyor for expressing moisture from the
proved spigots 50 Inot only make it possible to
concentrates within said iield, and means for
control the discharge of tailings and middlings,
swinging said roller toward and away from said
but also permit quick closing when the machine
conveyor.
f
is shut down, and prevents complete drainage
-5. In a separator, a conveyor belt having a
of the hoppers 4|, $2,
20 lower stretch, magnets above said stretchrfor
ment with the sealing strips 35.
The improved needle spray arrangement com
creating a magnetic field therebeneath, and a
bined with the adjacent trough plates 12, 15 is
feed tray for delivering material into one end of
very important since. the strong jets 'of fresh
said field beneath said stretch, said tray having
liquid effectively spray the material being carried
~a central valley beneath said stretch and opposite
along the separating zone by the belt 20, and the- 25 side channels beyond the sides of said conveyor
plates prevent dislodged magnetic particles from
provided With barriers for catching overflow ma
dropping out of the zone of magnetic influence.
terial above the magnetic field. '
,
The oriñc'es 1l provide simple means- for observ
6. In a separator, a conveyor belt Vhaving a
ing the pressure in the several pipes 24, 25 so as
lower stretch, magnets above said stretch for
to obtain most efficient operation, and the. press 30 creating a magnetic field therebeneath, and a
roller 18 and diverter plates 82, 89 enable the
feed tray for delivering material into one end of
operator to thoroughly dewater the concentrates
before ñnal delivery thereof from the machine.
These needle sprays and dewatering appliances
are readily applicable to other types of separa
tors wherein the materials are transported
through a washing and separating zone by con-.
veyors of other types. These various improve
said field beneath said stretch, said tray having
a central valley within said field and opposite side
channels beyond the sides of the field provided
35 with barriers for catching overflow material es
caping above said field. .
7. In a separator, a conveyor belt' having a
lower stretch, magnets above said stretch for _cre
ating a‘magnetic ñeld therebeneath, a feed tray
ments have proven highly satisfactory in actual
use, and provide a separator which besides being 40 for delivering material into one end o'f said field
simple and compact in construction, is also ñex
beneath said stretch, said tray having a central
ible in use, and can be installed and operated at
valley beneath said stretch and opposite side
minimum cost considering the enormous capacity
channels beyond the sides of said conveyor pro
thereof. The use of oil under high static pressure
vided with barriers for catching overflow mate
head within the casing 28 not only provides ef
rial above the magnetic field, and a dam spanning
fective insulation, but is also extremely important
as a safety feature, since it positively prevents
liquid from entering the casing 28 and thus
said valley.
,
8. In a separator, a conveyor f belt having a
lower stretch, magnets above said stretch for
creating a vmagnetic field therebeneath, a feed
casing 28.
50 trayfor delivering material into one end of said
It should be understood that it is not desired
field beneath said stretch, said trayhaving a cen
to limit this invention to the exact details of
trai valley within said field and opposite side '
construction or to the precise mode of operation,
channels beyond the sides of the field provided
damaging the coils, in case a leak occurs in the
herein shown and described, for various modifi
with barriers for catching _ overflow material
cations withìn the scope of the claims may occur 55 escaping above said field. and a dam spanning the
to persons skilled in the art.
I claim:
delivery end of said valley.
,
l. In a separator, a4 conveyor belt. having a
.
-
9. In amagnetic separator, a pair of spaced
pulleys, a carrier belt for running over said pul
leys and having a lower reach suspended in
lower stretch, a bank of magnets adjoining the
top of said stretch, and a feed tray for delivering- 60 loosely sagging position therebetween, means for
material beneath said stretch into the magnetic
feeding along the under side of said reach a liquid
zone, said tray having a central valley and oppo
mixture of the magnetic and non-magnetic par
site side channels provided with barriers for
ticles to be separated, a series o_f magnets on the
catching overñow material on opposite sides of
upper side of said> reach, said magnets having
and above the magnetic field,
5 pole faces forming a series which extends along
2. In a separator, an endless conveyor, a series
and is curved in substantial conformity with the
of magnets on one side of said conveyor-for cre
upper surface of said lower reach, spacer means
ating a magnetic field along the opposite side
between such pole faces to form therewith _a sur
thereof, and a roller resiliently engaging said op
face opposed to the upper surface of said reach,
posite side of said conveyor near the discharge 70 and a conduit opening into a slight space between
end of said field for expressing moisture from the
said surfaces at a point spaced from the edges of
concentrates within said ñeld.
the belt and spaced from the ends of the series
3. In a separator, an endless belt conveyor. a
series of magnets on one side of said conveyor for
of pole pieces, said conduit being constructed
_ and arranged for connection to a source of water
creating a magnetic ñeld along the opposite side 75 supply under pressure for injecting water to cause
2,410,601
11
-said slight space to be maintained against the
conducting along the under side of said first
named areas, a liquid mixture containing mag
netic particles and non-magnetic material, a se
riesV of magnets on the upper side of said lower
magnetic forces on the particles which tend to
press said belt stretch against the pole faces.
'
10. In a, magnetic separator, a pair of spaced
pulleys, a carrier belt for running over said pul 5 reach, such series extending along and being
leys and having 'a lower reach suspended in loose
curved in substantial conformity with said areas,
for causing said particles to be separated and
1y sagging position therebetween, means for feed
ing along the under side of said reach a liquid
carried on the belt, while the belt areas with
mixture of the magnetic and non-magnetic par
such particles thereon travel from an approxi
ticles to be separated, a series of magnets on the 10 mately horizontal position, through a region of
.upper side of said reach, said magnets having
submergence in said liquid, and thence up to said
pole faces forming a series which extends along
discharge point, means at said region for project*
and is curved in substantial conformity with the
ing submerged jets of water against the belt for
upper surface of said lower reach, spacer means
between such pole faces to form therewith a sur
dislodging non-magnetic material, means ex
tendingalong adjacent the sources of said jets
for preventing settling _of magnetic material away
Aface opposed to the upper surface of said reach,
and a plurality of conduits opening into a slight
space between said surfaces at spaced points re
spectively, said conduits being constructed and
fromv the belt, and means at 'said more inclined
areas, subsequent to said region of submergence
and in advance of said discharge point for wash
arranged for connection to a source of water sup
ply under pressure for injecting water to cause
said slight space to be maintained against the
magnetic forces on the particles which tend to
press said belt stretch against the pole faces.
ingt remaining non-magnetic material from the
bel .
13. In a magnetic separator, a pair of spaced
pulleys, one substantially higher than the other,
11. In a magnetic separator, a pair of spaced .
pulleys, one substantially higher than the other,
a carrier belt for running over said pulleys and
having a lower reach suspended in loosely sagging
position therebetween, the lower reach areas
'which are nearer the lower pulley sagging in ap
proximate tangency to the horizontal while areas
a carrier belt for running over said pulleys and
having a lower reach suspended in loosely sag
ging position therebetween, the lower reach areas
which are nearer the lower pulley sagging in ap
proximate tangency to the horizontal while
areas nearer the higher pulley are inclined more
30 and more upwardly to a discharge point, means
for driving the pulleys and belt in a direction for
upward travel of said reach, means for feeding
and conducting along the under side of said ñrst
ward travel of said reach, means for feeding and 35 named areas, a liquid mixture containing mag
netic particles and non-magnetic material, a se
conducting along the under side of said ñrst
ries of magnets on the upper side of said lower
named areas, a liquid mixture containing mag
reach, such series extending along and being
netic particles and non-magnetic material, a se
curved in substantial conformity with said areas,
ries of magnets on the upper side of said lower
nearer the higher pulley are inclined more and
more upwardly to a discharge point, means for
driving the pulleys and belt in a direction for up
reach, such series extending along and being 40 for causing said particles to be separated and
carried on the belt, while the belt areas with such
curved in substantial conformity with said areas,
particles thereon travel from an approximately
for causing said particles to be separated and
horizontal position, through a region of sub
carried on the belt, while the belt areas with such
mergence in said liquid, and thence up to said
particles thereon travel from an approximately
horizontal position, through a region of sub 45 discharge point, and means providing a station
ary surface extending up along and in spaced
y'mergence in said liquid, and thence up to said
relation to said more inclined areas on the belt,
discharge point, means at said region for project
to form a trough space subject to the effective
ing submerged jets of water against the belt for
field of said magnets above said region of sub
dislodging non-magnetic material, and means
mergence, and means for projecting a series of
extending along adjacent the sources of said jets
forceful sprays of water against the belt in said
for preventing settling of magnetic material
trough space, to thereby release remaining non
away from the belt, means providing a station
magnetic material on the belt while said station
ary surface extending up along and in spaced
ary surface retains any dislodged magnetic par
relation to said more inclined areas on the belt,
to form a trough space subject to the effective 55 ticles within said field for recapture on the belt,
and said remaining material is washed back down
field of said magnets above said region of sub
the trough space by the spray water.
mergence, and means for projecting a series of
i4. In a magnetic separator, an endless belt
forceful sprays of water against the belt in said
having a lower material conveying reach,`means
trough space, to thereby release remaining non
magnetic material on the belt while said station 60 for advancing said lower reach upwardly at an
oblique angle, a series of magnets above and in
'ary surface retains any dislodged magnetic par
close proximity -to said advancing reach, means
ticles within said field for recapture on the belt,
providing a stationary surface extending along
and said remaining material is washed back down
and in spaced relation to the under side of said
the trough space by the spray water.
412. In a magnetic separator, a pair of spaced 65 lower reach to provide a space subject to the
effective field of said magnets, means for feeding
pulleys, one substantially higher than the other,
magnetic particles and non-magnetic material
a carrier belt for running over said pulleys and
mixed with liquid into a lower region of said
having a lower reach suspended in loosely sag
space while maintaining said feed receiving
ging position therebetween, the lower reach areas
which are nearer the lower pulley sagging in ap 70 region constantly submerged in liquid, means
for projecting forceful jets of other liquid through
proximate tangency to the horizontal while areas
the liquid within said region to dislodge non
>nearer the higher pulley are inclined more and
magnetic material from said lower reach while
more upwardly to a -discharge point, means for
preventing settling of the magnetic particles,
driving the pulleys and belt in a direction for up
ward travel of said reach, means for feeding and 75 and means for effecting discharge of the mag
13
2,410,801
`netic particles at a point above said submerged
regions.
15. In a magnetic separator, an endless belt
having a lower material conveying reach, means
for advancing said reach upwardly at an oblique
angle, a series of magnets above and in close
proximity to said advancing reach, a normally
' ñxed plate having an upper surface extending
~
14
and along beneath said reach in spaced relation
thereto and arranged together with the tailings
hopper to maintain a body of liquid submerging
a substantial portion of said reach, means ad
jacent one end of said reach for feeding into
said trough means and thence along the under
side of said reach toward said hopper, a mixture
of the magnetic and non-magnetic particles to
along and in spaced relation to the under side of
said lower reach to provide a space subject to 10 be separated, the concentrates discharge being
adjacent the end of said reach opposite from
the effective ñeld of said magnets, means for
said feeding means, a sexies of magnets on the
eiîecting variation in the position of said plate
upper side of said reach, said magnets having
relative to said conveying reach to vary the dis
pole
faces forming a series which maintains a
tance between said surface and said magnets,
ñeld along said reach extending from the feeding
means for feeding a'mixture of magnetic and
non-magnetic materials into a lower region of 15 means to the discharge position, and means be-À
tween said hopper and discharge position for
said space, means for projecting forceful jets of
introducing
jets of water into the trough space.
liquid across said space to dislodge non-mag
17. In a magnetic separa-tor, a conveyor belt
netic material from said lower reach while pre
venting settling of the magnetic particles, and 20 having a lower stretch, a series of magnets ex
tending along the upper surface of such stretch,
means for eiïecting discharge of the magnetic
and a feed tray for delivering material along
particles from an upper region of said space.
beneath said stretch into the ñeld of said mag
16. In a magnetic separator, a pair of spaced
nets, said tray having a central valley and oppo
pulleys, a carrier belt for running over said pul
leys and having a lower reach suspended in loose 25 site side channels provided with barriers for
catching overñow of material on opposite sides
ly sagging position therebetween, a tailings hop
of said central valley and for directing such over
per beneath a low _sagging portion of said reach,
ñow material into the magnetic ñeld.
trough means extending in upwardly inclined
directions from each side of said tailings hopper
ROBERT E. CROCKE'I'T.
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