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Патент USA US2120785

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June 14, _1938.
`
E. C. SAINT-JACQUES
FURNACE FOR TREATING PULVERULENT MATERIALS
\
Filed'wiarcn 4, 193s
//k/
¿0.
2,120,785
2,120,785
l Patented June 14, 1938
~UNITED sTATEs PATENT or-'FTCE
2,120,785
TREATING
Foa MATERIALS PULV'ERULENT
Yrinuncia
Eugène Camille Saint-Jacques, Paris, France
4, 1936, Serial No. 67,137
Applicatiiînn France
March March 12, 1935
1 claim. (Ci. zes-29)
The present invention has for its subject mat
ter a furnace capable of being used for. any
roasting or calciiialtionI operations upon pulveru
lent materials and in particular for oxidation,
5 reduction or other treatments of ores in the>
pulverulent state.
‘
This furnace is constituted essentially by a
cylindrical body forming a. turbulent heater sur
mounted by a distributing extension and in which
10 the materials to be treated enter, with a spiral
movement with more or less flattened spirals.
and
cumference and between which the material into
the gaseous fluid are forced to pass to enter
the body I.
.
`
Combustion air may be passed under pressure
into an annular chamber 6 whence it enters
tangentially or not into the cylindrical body I
by open apertures 1.
'
`
8 is» a gas, heavy oil, pulverized fuel or other
burner the flame of which enters tangentially
into the cylindrical body I- and rises during the 10
operation of the apparatus under the effect of
the internal depression created by the suction
In this cylindrical body there open, preferably fan so as to enter into contact with the gyratory `
tangentially and at suitable points, 4‘inlets forv descending current of the materials to be treated.
` combustion air if necessary, and if desired Va
l1li gas, heavy oil, pulverized fuel or other vburner or
The diameter of the extension 2 is substan
tially smaller than that of the body I.
In its lower part the cylindrical fore-body I
The cylindrical body forming the heater for.L opens into a reverberatory furnace 9 the dimen
burners.
,
A
I
y
the materials to be treated terminates at its y sions of which may be very reduced and in which
20
lower part in a reverberatory furnace preferably
2g provided with one or several burners, and in
- which the materials in the molten state achieve
an intimate intermixing and react upon one
another.
s
.
` Due to the combination of aturbulent heater
in which the pulverulent materials to be treated
25 descend turbuiently and are heated progressively
I0 and II are the discharge openings for the
molten bath and the slag -swimming on the fur
nace respectively. Into the furnace 9 one or
more burners I2 similar to the burner l may
Open.
y
The operation of the furnace is as follows:
The pulverulent material to be treated, which
material is suspended in a gaseous fluid and if
to above 1000° C. for example, and of a rever
necessary mixed with fluxes or other mate
beratory furnace in which the treatment or the rials which are also in a pulverulent state, is
reactions of the materials in the fused state _ tangentially introduced into the space between
30 simply take place, there may be given to this
latter part of the furnace (the heat eiilciency
of which is in general rather low in comparison
with that of a turbulent furnace) much smaller
dimensions than if an ordinary reverberatory
35 furnace merely beused to effect the same op
erations.-
y
-
u
In the appended drawing there has been ~shown
diagrammatically by way ofV non-limiting ex
ample an embodiment of the subject of the in
¿o vention.
'
‘
The furnace comprises a cylindrical body 4I
which communicates- at 'its upper part with a
ycylindrical extension 2', to winch is connectedtangentially a pipe 3 through which the mate
rials to be treated opter, previously reduced to
the pulverulentstate and held in suspension in
any suitable gaseous fluid.
0
the cone l and the cylindrical. fore-body 2 and
takes a spiral descending movement in the said
space. In the course of the said movement the
material is uniformly distributed aroundthe cone m Ul
I so that the whole periphery of this cone is
equally covered‘with the same.
The speeding up of the mixture‘of gas and
material is progressively obtained 'through the
progressive throttling of the section of space a
between the cone l and the housing 2. The
mixture takes a speed which becomes greater
and greater as the mixture effects its spiral
descending movement and when it arrives in
the very narrow annular space b which is oc
cupied by the vanes 5 it is automatically carried
forth and directed into the inner part of the
heater I through the said vanes which are pref
erably curved in order to `flatten the spirals
At the interior of the cylindrical' extension is . followed-by the mixture to be treated during
arranged an inverted cone-shaped funnel 4 the
top of which communicates with a iiue I3 in
which is located a suction fan Il driven by a`~
motor Il, and the base of which is connected
to the wall of the cylindrical extension by the
intermediary of blades I. preferably' inwardly
55 curved, uniformly- distributed over all the cir
its spiral movement when descending through
.the said heater; it results therefrom that the
material to be treated follows, in this heaterl
a longer way and thus - remains longer in the
saine. whichinsures a more intensive heating of
the particles of treated material.
55
i 2
A2,120,785
When entering the body I (of larger diameter)
through the vanes 5 the particles of the materialv
to be treated‘proceed on their spiral descending
movement'the spirals of. which are preferably
ñattened inwardlyv of the heater. During this
A time 'the fan which‘ communicates with the top
of the `cone 4 produces acurrent of partialvacu
When enteringv the reverberatory furnace 8>
which is heated vthrough the burner or burnersI2, the materials are molten; the one, for in
stance, and the ñux are 'intimately mixed, thus
forming the molten -bath which is decanted.
At the given moment the metal vis evacuated,
for. instance at l0 and the slag at I I, in the known '
um upwardly in the middle line of the circular » manner.
trajectory-followed by the mixture of gas’v and
10 material, combustion _air under pressure entering
the body I of the furnace through-the vopenings 1.
Due to'this combination‘of the gyratory move
ment imparted to the mixture of gas and pul
verulent materials- with thisrising ‘current of
15 partial. vacuum there is produced, on the one
What I claim is:
‘
"_
~
_
Apparatus for the ’treatment of finely com 10
minuted metalliferous particles comprising ` a
cylindrical fluxing chamber, va cylindrical dis
tributor havinga smaller diameter than that of
the fluxing chamber for tangentially projecting`
the particles ‘in the top of said iluxing chamber 15
hand, a rational intermixing of the gases and _ whereby theparticles take a downwardly swirl
the gravity fall Aof the latter and, lastly, a hori ,ing motion inthe fluxing chamber, an annular
zontal separation or. classification effectin the -chamber -around the fluxing chamber in _the bot
‘ materials and, on the other hand, :a braking of
materialswhich, upon accentuating the disper
tom portion thereof, meansv for introducingïcom
sion of the- latter in th'e'gaseous stream, facili
tates their contact with the combustion gases _and
renders the roasting or calcinationjoperation still
in said air chamber >for establishing communica- .
more complete.
'
»
c
,
L
b_ustion 'air into thisv latter chamber, 'apertures'
tion with the inside v'ofi the fluxing chamber, a
burner opening tangentially into the fluxing
chamber and disposed below the annular air .
In the inner of the heater I the gaseous stream
' holding the material to vbe treatedin a suspended chamber, a rreverlziera‘tory furnace directly con
the bottom of the fluxing chamber-andcondition is inflamed through any known means, _ nected-to
into which the particlesv'are received,~me'ans fo'.'
for insta-nce by means of the burner`8. Y During _
-30
. their spiral gyratory. movement in the in_ner of
‘ supplying heat t saidA furnace whereby theufluxed.
the'y furnace the particles of~ the material have -particles are«..m lted and maintained Vin a fluid '
lquite time for being hefated up to-temperatures ' . condition, discha ge openings in said furnace for
the .molten particles, the Icylindrical distributor
,of more than 1000° C. forQinstance, and even for " being *providedV withA an axial opening at its top,
beginning to mix with. and to- react upon the
and a >fan connected to said opening for creating
fluxes or other materials which `have been intro,
duced with them, .the _gases which are produced __ a suction inthe inside of thefluxing chamber.
vbeing drawn off through the fan which communi
cates with the top of the cone Í.
EUGÈNE
sAIN'LmccïzUEs.A .
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