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Патент USA US2123301

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July 12,1938.
'
~G_ GRAVE
'
2,123,301
“ELECTROSTATIC SEPARATOR FOR THE SEPARATION OF‘ FINE GRAINED MIXED MATERIALS
Filed March 12, 1956
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2,123,30
Patented July 12, 1938
UNITED} STATES PATENT OFFICE
z,123,301
ELECTROSTATIC SEPARATOR FOR. THE
SEPARATION OF FlNE-GRAINED' IWIXED
MATERIALS
Georg Grave, Frankfort-on-the-Main, Germany,
assignor to American Lurgl Corporation, New
York, N. Y., a corporation oi New York ‘
‘Application March 12, 1936, Serial No. 68,532
r
. In Germany March 20, 1935
6 Claims. (Cl. 209-128)
This invention; relates to an electrostatic sepa
by means of the bolt It adapted to be guided
rator for- the separation of fine-grained mixed and tightened in the groove it of the frame 65.
materials, said separatorv having an-uncharged An earthed protective surface 8 may be provided
‘ ‘ chute surface over which the materials slide and
from the lowerledge of which they are caused to
, drop at different velocities. According to the
‘ present invention there is provided in the rear
‘ ‘of said surface and opposite its discharging edge,
above the chute t.
_
Opposite the bottom edge of the chute 4 is a @
‘deflector It, facing the oncoming material and
adapted to be adjusted in respect of its distance
improved. The effect of the impact against said
from, and angle in relation to the chute t. It
will be seen that the deflector it is positioned in
the path of the material leaving the chute where ill
the material .has a substantial horizontal com
ponent of travel. Said de?ector It is insulated
in relation to the frame it, and therefore to earth
as well, by means of insulators it, and is con
nected with a source of high-tension current by M
a conductor ill. The electrode it may be charged
with direct or alternating current, or by surge
de?ector can be modi?ed, depending upon the
current.
an electrically charged separating surface which
serves as a de?ector for the entire material and
from which the material rebounds along sepa
rate distinct paths. The ‘result obtained thereby
is that the angles of dispersion of the, particles
of the mixture (which have already become sepa
15 rated to some extent in falling from the chute)
are increased and the separating operation is
particular circumstances, by altering the angle
20 at which the de?ector is inclined, or the distance
at which it is mounted from the edge of the
chute.
-
~
.
-
The separator of the present invention di?ers
fundamentally from known arrangements with
electrically charged ‘chute and a serially dis
25 an‘
posed ejecting surface of the same polarity. In
consequence of this identical charge in the eject
ingsurface, the material-4n contrast to the ac»
tion of the deflector of the present invention
30 does not rebound. On the contrary, the sole pur
pose of the known ejecting surface, which is de»
signed as a sieve, is to allow the less‘powerfully
energized particles of the material to drop
through between the ejecting surface and the
more powerfully
35 chute, whilst allowing the
charged particles to pass onwards. This opera
tion has nothing in conunon with the object
of the‘ present invention, namely to increase,
through the rebounding action, the angle of dis
40 persion of the particles of the mixture that have
already dropped,in a separated condition, from
the chute.
.
In order more clearly to understand the inven
tion, reference is made to the accompanying
45 " drawing, which illustrates diagrammatically and
by way of example one embodiment thereof ;
Fig. 1 being a side elevation; and
‘
Fig. 2 an end elevation viewed in the direction“
of the arrow A.
The ?ne-grained material‘ to be separated
passes from the feed channel it into the dis
v
'
As the result of the induction exerted by the
charged plate it on the lower edge of the chute 20
d,[the particles dropping, at different velocities
from the chute it receive an additional electro
static charge and impinge on the plate it in a
difi'erentrcondition in respect of ‘their electro
static charge, as indicated by the broken lines. 25
The dlderent velocities of the particles leaving
the chute is due to differences in various prop- ‘
erties of the materials to be separated, such as
differing susceptibilities to being charged by fric
tion, di?ering sizes, weights, shapes and other so
differing properties of the particles. They re
bound from the plate ill, along the separate dis
tinct pathsuinto the receptacles t and ‘l, the
catchment areas of which can be varied, accord
ing to requirements, by means of an adjustable 35
tongue 5 located between the receptacles. In
consequence of the different angles at which the
particles impinge-according to their specific
electrostatic charge-on the plate l0, and under
the influence of the reversal of the'charge occur 40
ring on the plate i t (which takes up more or less
time according to the electrical conductivity of
the particles), a separation into very wide angles
of dispersion is effected, which results in emcient
separation of the material.
45
1. An electrostatic separator for the separation
of ?ne-grained materials, comprising in combi-r
nation, an electrically uncharged inclined chute, \
"means for feeding materials to be separated to
said chute, an electrically charged separating sur
tributing hopper 2, from which it is delivered, face positioned facing the lower edge of the chute
through an adjustable slide 3, on to the oblique across the plane thereof at a position in the path‘
chute t. This chute is movably mounted on the of all the material leaving the chute where the
55 frame l5, at H, and its slope can be adjusted. material has a substantial horizontal component 55
2
2,123,301
of travel to serve as a de?ector for all of the
material leaving the chute whereby particles
leaving the chute at different velocities are caused
to rebound in separate distinct paths, and sepa
rate receptacles positioned in said separate paths.
2. An electrostatic separator for the separa
tion of fine-grained materials, comprising in
_ combination, an electrically uncharged inclined
chute, means for varying the inclination of the
10 chute, means for feeding materials to be sepa
rated to said chute, an electrically charged sepa
rating surface positioned facing the lower edge
,
chute across the plane thereof at a position in the .
path of all the material leaving the chute where v
the material has a substantial horizontal com—
ponent of travel to serve as a de?ector for all of
the material leaving the chute whereby particles
leaving the chute' at different velocities are caused
to rebound in separate distinct paths, means for
varying the inclination of the separating surface,
and separate receptacles positioned in said sepa- "
10
rate paths.
5. An electrostatic separator for the separa
tion of ?ne-grained materials, comprising in
combination, an electrically uncharged inclined
of the chute across the plane thereof at a posi
tion in the path of all the material leaving the . chute, means for feeding materials to be separat
ed to said chute, an electrically charged separat 15
15 chute where the material has a substantial hori
zontal component of travel to serve as a de?ector ing surfacepositioned facing the lower edge of
for all of the material leaving the chute whereby the chute across the plane thereof at a position
particles leaving-the chute at different velocities in the path of all the material leaving the chute
are caused to rebound in separate distinct paths, where the material has a substantial horizontal
20
and separate receptacles positioned in said sepa—
rate paths.
3. An electrostatic separator for the separa
tion of fine-grained materials, comprising in com
bination, an electrically uncharged inclined
25 chute, means for feeding materials to be sepa
rated to said chute, an electrically charged sepa
rating surface positioned facing the lower edge
of the chute across the plane thereof at a posi
tion in the path of all the material leaving the
30 chute where the material has a substantial hori
zontal component of travel to serve as a de?ector
for all of the material leaving the chute where
by particles leaving the chute at different veloci
ties are caused to rebound in separate distinct
35 paths, means for varying the inclination of the
separating surface, and separate receptacles posi
tioned in said separate paths.
4. An electrostatic separator for the separation
of fine-grained materials, comprising in combi
40 nation, an electrically uncharged inclined chute,
means for varying the inclination of the chute,
means for feeding materials to be separated to
said chute, an electrically charged separating
surface positioned facing the lower edge of the
component of travel to serve as a de?ector for 20
all of the material leaving the chute‘ whereby
particles leaving the chute at different velocities
are caused to rebound in separate distinct paths,
means ‘for varying the distance between the sepa
rating ‘surface and the lower edge of the chute, 25
and separate receptacles positioned in said sepa
rate paths.
I
6. An electrostatic separator for the separa
tion of fine-grained materials, comprising in com
bination, an electrically uncharged inclined 30
chute, means for feeding materials to be sepa
rated to said chute, an electrically charged sepa- -
rating surface positioned facing the lower edge of
the chute across the plane thereof at a position
in the path of all the material leaving the chute 35
where the ‘material has a substantial horizontal
component of travel to serve as a de?ector for
all of the material leaving the chute whereby
particles leaving the chute at different velocities
are caused to rebound in separate distinct paths, 40
separate receptacles positioned in said separate
paths and means for varying the catchment areas
of said receptacles.
GEORG GRAVE.
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