Патент USA US2120785код для вставки
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 .