Method of low-autogenous raw material processing in flash smelting furnaces

FIELD: metallurgy.

SUBSTANCE: according to method, low-autogenous raw material processing in flash smelting furnace comprises supplying a metal-containing charge and flux as charge-gas flame to reaction zone of the said furnace by stream of oxygen or air enriched with oxygen, charge melting occurs to form a molten matte and slag, their separation by settling, separate liquid melting products and gases outputing. Charge composition comprises carbon containing reducer with fineness of 3-15 mm in an amount of 0.4 to 5 tons per hour in at volume ratio of 1:30 to 1:2 relative to flux.

EFFECT: increased productivity of flash smelting process, reduced probability of scull formation in uptake and slag bath of furnace, and also reduced losses of non-ferrous metals with waste slag.

2 cl, 3 tbl

 



 

Same patents:

FIELD: metallurgy.

SUBSTANCE: process comprises treatment of slag with calcium oxide in the presence of reducing agent at increased temperature. Note here that copper slag-to- solid carboniferous reducer carbon ratio makes 1:(0.05-0.09). Mix surface is blown by oxygen-containing oxidiser using the upper non-intrusive blowing with flow rate of oxygen-containing oxidiser in amount of defined by oxygen content therein, 50-100 kg per ton of slag.

EFFECT: decreased content of nonferrous metals in slag, simplified process.

1 tbl, 1 dwg

FIELD: chemistry.

SUBSTANCE: method includes carbothermal reduction of a metal oxide to obtain a mixed gaseous stream containing a metal and carbon monoxide, keeping the mixed gaseous stream at high temperature sufficient to prevent re-formation of metal oxide, releasing the mixed gaseous stream from the reactor through a convergent-divergent nozzle connected to the reactor for flash cooling of said stream to a temperature at which no re-formation of metal oxide occurs, separating and collecting the metal. The nozzle is further heated by direct interaction with the reactor and/or by using an induction heating system and/or by direct heat transfer. Temperature of the surface of the nozzle in contact with the mixed gaseous stream is kept at a level sufficient to prevent precipitation of products of said mixed gaseous stream on said surface. The reactor has a convergent-divergent nozzle for releasing the mixed gaseous stream adapted for said heating.

EFFECT: preventing precipitation on the surface of the nozzle.

5 cl, 13 dwg, 1 dwg

FIELD: metallurgy.

SUBSTANCE: proposed method comprises preparation of charge by mixing the tinstone concentrate with coal and fluxing additives consisting of sodium carbonate and sodium chloride and reduction melting of said charge at 870°C. Then, obtained melt is cooled to separate metal from slag. Note here that charge melt is irradiated by nanosecond electromagnetic pulses for 10-30 minutes.

EFFECT: higher yield of lead, accelerated melting.

1 tbl, 2 ex

FIELD: metallurgy.

SUBSTANCE: proposed method comprises grinding of concentrate and pyrometallurgical break-down of concentrate in two steps. At first step, sodium is subjected to carbothermic reduction from concentrate by sodium evaporation at the pressure p=10-50 Pa, temperature T=1000 K and carbon content with respect to concentrate mC=2.9 wt %. Sodium vapours are withdrawn from reaction volume and condensed at T=300 K. At second step, further carbothermic reduction of produced enriched concentrate is performed at p=10-50 Pa, temperature T=2000 K and carbon content relative to enriched concentrate mC=28 wt % with reduction of refractory metal oxides to carbides in condensed phase and transition of rare earth element oxides to gas phase. Said phase is withdrawn from reaction volume and condensed at T=300 K.

EFFECT: higher yield of sodium, rare earth elements and refractory metals without application of harmful reagents.

1 dwg

FIELD: metallurgy.

SUBSTANCE: pyrometallurgical processing comprises three steps: reduction, smelting and oxidation. Reduction step comprises carbothermic reduction of concentrate at limited amount of carbon in the system to reduce solely refractory metals (RM) to their carbides to get the process mix of oxides of rare-earth elements (RE) and RM carbides. Smelting step separates RE from TM carbides. Said separation consists in dissolution of RM in liquid iron. This brings about iron containing RM and slag composed by target product, i.e. RE oxides. Third oxidation step consists in processing RM-bearing iron with oxygen to produce steel and iron on the base of RM oxides.

EFFECT: production of RE oxides and RM oxides to be processed by known technologies.

FIELD: metallurgy.

SUBSTANCE: method involves carbothermal vacuum treatment. Prior to carbothermal treatment, a charge is prepared, which consists of perovskite concentrate and carbon-containing material in the ratio suitable for formation of calcium carbide, and titanium carbides and oxycarbides. Opening is performed in one unit in two stages. At the first stage, carbothermal treatment is performed at the temperature of 1100-1300°C and residual pressure of 10-100 Pa so that solid mixture of calcium carbides and titanium carbides and oxycarbides is obtained. The second stage is performed at the temperature of 1400-1500°C and pressure of 5-10 Pa for dissociation of calcium carbide and its stripping so that elementary calcium and carbon is obtained and with concentration in the residue of precious components of titanium, tantalum, niobium and rare-earth metals, which are contained in perovskite concentrate and are subject to chlorination.

EFFECT: improving specific productivity, reducing technological operations and use of a cheap reducing agent - carbon-containing materials.

1 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: proposed method comprises making the charge from calcium carbonate, primarily, from chemically deposited chalk or high-quality sifting in production of limestone and carbon, primarily from reused graphite, obtained at final stage of carbothermic process. Note here that starting charge is pelletised, placed in furnace and heated in vacuum in one unit at three steps. At first step, calcium carbonate is dissociated in the presence of carbon at 600-700°C for 2-4 hours and residual pressure of 40-50 Pa to remove carbon monoxide. At second step, calcium carbide (CaC2) is synthesized at 1400-1500°C and 100-150 Pa to remove carbon monoxide. At third step, calcium carbine is dissociated to produce elementary calcium and graphite at 1300-1400°C and < 10 Pa.

EFFECT: higher efficiency, simplified process, application of cheap reducing agent.

1 tbl

Calcium carbide // 2501733

FIELD: chemistry.

SUBSTANCE: method includes thermal processing of crushed limestone and coal with discharge of gaseous products, which are applied for production of carbonic acid. Thermal processing is carried out in one reactor. At the first stage in the process of introduction of raw material into reactor it is subjected to heating to 1000°-1200°C by transmission of heat from constructive elements of loading canal and by exposure of raw material to plasma beam in zone of free movement of raw material particles. Thermal processing of raw material is realised in atmosphere of carbon dioxide. Further synthesis of calcium carbide is realised at temperature, at least, 1700-1800°C by induction heating of reaction mass. Obtained calcium carbide liquid is discharged. Gaseous products, from which carbon oxide and carbon dioxide are separated, are discharged from upper part of reactor, and at least, part of discharged carbon dioxide is applied for filling loading canal. For production of carbonic acid volume of carbon dioxide, remaining after filling loading canal and entire volume of carbon oxide are applied.

EFFECT: increase of target product output and reduction of process power consumption.

1 dwg

FIELD: metallurgy.

SUBSTANCE: method involves carbon thermal reduction of oxide compound of rare-earth metal in vacuum so that powder of rare-earth metal carbide, which is free from residues of oxygen impurity, is obtained. Then, it is cooled down and mixed with high-melting metal powder in the ratio that is sufficient for performance of exchange reactions between rare-earth metal carbide and high-melting metal, and mixture is heated with hot volumetric plasma discharge to the temperature of ≥1800°C. With that, evaporating rare-earth metal is collected on condensers and hard-alloy carbide of high-melting metal is obtained. The device includes a vacuum system, cathode and anode assemblies arranged concentrically in the chamber, and a steam line and a condenser-cooler, which are coaxial to them. With that, an internal electrode represents an anode of high-current vacuum plasma discharge burning in an annular discharge cavity formed with coaxial cylindrical electrodes. The anode is made from high-melting electrically conducting material in the form of a crucible having a capacity, and a thin-wall cathode enveloping it, outside which there located is a starting resistance heater, is also made from high-melting electrically conducting material, for example tungsten, tantalum or graphite.

EFFECT: improving extraction of rare-earth metal.

5 cl, 1 dwg

FIELD: chemistry.

SUBSTANCE: method involves mixing a concentrate, a carbonaceous reducing agent and a pore-forming additive in form of ammonium sulphate, pelletising the obtained mixture, firing and holding at maximum temperature with reduction of silicon dioxide to a gaseous monoxide, crushing the obtained sinter, treatment thereof with ammonium bifluoride and calcining the reaction mass to obtain an aluminium-containing product, wherein ammonium sulphate is taken in an amount of 10-20% of the mass of the concentrate; before pelletising, the mixture is milled to obtain particles with size of 50-75 mcm in amount of at least 80%; the mixture is fired at temperature of 1690-1750°C; ammonium bifluoride is taken in amount of 0.4-14% of the mass of the sinter; and the reaction mass is calcined at 700-900°C. Before treatment with ammonium bifluoride, the sinter can be treated with 10-20% hydrochloric acid. The degree of extraction of aluminium oxide from the concentrate is increased by 1.3-9.9%. Content of aluminium oxide in the end product reaches 97.7% with content of silicon oxide impurities of 0.13-1.0%.

EFFECT: high content of aluminium oxide in the end product while reducing content of silicon oxide impurities.

3 cl, 6 ex

FIELD: cleaning of low-grade coal not suited for production of reduced metal by standard carbon-composite method.

SUBSTANCE: proposed method is based on use of cleaned coal for production of high-quality reduced metal. Coal is first kept in organic solvent simultaneously with heating, thus obtaining cleaned coal suitable for metallurgy which possesses higher thermoplasticity as compared with starting coal. Then, mixture of cleaned coal and starting material is subjected to agglomeration in agglomerator and agglomerate thus obtained is reduced at heating in furnace provided with movable hearth; then, it is molten by further heating, thus obtaining reduced melt which is cooled and hardened in furnace provided with movable hearth, thus obtaining solid material, after which reduced solid material is withdrawn from furnace. Then, slag is removed with the use of screen and reduced metal is extracted.

EFFECT: enhanced efficiency; improved quality of reduced metal.

21 cl, 9 dwg, 10 tbl, 7 ex

FIELD: metallurgy; reduction of metal oxides by carbon-containing agents for obtaining final product at different phase state.

SUBSTANCE: charge in form of mixture of oxides and reductant is fed to heated furnace and is mixed in way of temperature rise at passage of gas mixture through charge in way of temperature rise. Size of particles of oxides does not exceed 2-4 mm. Used as reductant are hydrocarbons and/or oxygen derivatives of hydrocarbons and/or their polymers. Reduction process is completed within range of temperatures of forming final product at preset phase state.

EFFECT: enhanced efficiency of process.

3 dwg, 6 tbl

FIELD: metallurgy.

SUBSTANCE: invention concerns tin metallurgy field and can be used for tin manufacturing while treatment of cassiterite concentrates. Method of tin manufacturing from cassiterite concentrate with content of 35-50% SnO2 includes batch preparation by blending of tin concentrate with coal and flux additive. In the capacity of flux additive it is used sodium carbonate and sodium nitrate. Melting is implemented at temperature 850-1000°C during 2 hours. For mentioned concentrate it is kept up following mass ratio: concentrate : coal : sodium carbonate : sodium nitrate, equal to 1 : (0.2-0.25) : (0.12-0.15) : (0.06-0.08). It allows without concentrate pretreatment to provide tin manufacturing of 98% purity at less in comparison with tradition approach, temperature.

EFFECT: simplification of manufacturing scheme, process temperature reduction at high enough purity of receiving product.

2 ex

FIELD: metallurgy.

SUBSTANCE: at reduction of metal and oxygen composition effect as reducer, herewith at first stage gaseous CO is passed into reaction chamber, containing specified composition of metal and oxygen. In conditions, providing conversion of CO into solid carbon and carbon dioxide, formed solid carbon is introduced into metal and oxygen composition. At the second stage solid carbon, which is introduced into metal and oxygen composition at the first stage, reduces metal and oxygen composition. Additionally at the second stage it is, at least, the first material- promoter, conducive reduction of specified metal and oxygen composition. Additionally the first material- promoter contains the first metal- promoter and/or composition of the first metal- promoter.

EFFECT: invention provides implementation of process at comparatively cold temperature with formation of less volumes of noxious exhaust gas.

21 cl, 3 dwg, 3 ex

FIELD: metallurgy.

SUBSTANCE: method includes formation of charge consisting of concentrate and sodium carbonate by means of intergrinding of components and reduction of charge components at presence of taken with excess carbonaceous reducing material at temperature 850-1300°C. Additionally batch material reduction is implemented up to providing of content of metallic iron in the range of particles dimensions 10-300 mcm not less than 80%. Received partly reduced conservative mass, consisting of metalise phase containing main part of iron and vanadium and oxide phase, containing main part of titanium and vanadium, it is grinned up to size not more than 300 mcm. Then it is implemented leaching of vanadium from reaction mass and leaching residue is separated from vanadate solution. After separation residue of leaching is subject to gravitational separation in water flow with separation of metalised and oxide phases. Metalised and oxide phases are separately subject to wet magnetic separation for receiving of metallic iron and titanium oxide concentrate. Additionally wet magnetic separation is implemented in the range of field intensity 20-300 E.

EFFECT: increasing of extraction of iron and titanium oxide.

7 cl, 4 dwg, 6 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to procedure for depletion of solid copper-zinc slag. The procedure consists in supply of charge containing solid copper-zinc slag and carbonic reducer at weight ratio of slag to solid carbonic reducer 1: (0.06-0.1) into heated furnace. Also charge in the heated furnace is blasted with oxygen containing oxidant by means of upper not-immersed blast; consumption of oxygen-containing oxidant is determined by contents of oxygen in it from condition of 60-110 kg per ton of slag. Further there is produced a rich with copper phase and zinc is transferred into a gas phase.

EFFECT: simplification of process of solid copper-zinc slag depletion.

1 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: reducing method of metals from oxides refers to reducing technologies of metals from non-organic oxides, at which preparation of homogeneous mixture is performed from ultradisperse powders of metal oxide and carbon, supply of prepared mixture under pressure to high-temperature zone in the well, which is formed with plasmatron jet, decomposition of metal oxide with formation of carbon dioxide that is removed through upper tuyeres of the well, and finished product is removed in the form of ultradisperse metal powder through tap holes in lower part of the well.

EFFECT: method allows reducing power consumption at reduction of metals from oxides and ensures the reduction of content of impurities in finished product at direct extraction of metals from oxides during continuous process.

FIELD: metallurgy.

SUBSTANCE: solid or melted substances are loaded on graphite body heated, at least, partially, inductively. Reducing agents are introduced therein, other than graphite carbon to collect flowing reduced and/or gasified melt. Note here that reducing agents are introduced along with solid or melted loaded particles. Said reducing agents represent natural gas, coal dust, brown coal dust, hydrocarbons, hydrogen, carbon oxide and/or ammonia to be introduced together with steam, oxygen, carbon dioxide and/or halogens or halogen hydrides.

EFFECT: simplified process.

18 cl, 5 dwg

FIELD: chemistry.

SUBSTANCE: method involves mixing a concentrate, a carbonaceous reducing agent and a pore-forming additive in form of ammonium sulphate, pelletising the obtained mixture, firing and holding at maximum temperature with reduction of silicon dioxide to a gaseous monoxide, crushing the obtained sinter, treatment thereof with ammonium bifluoride and calcining the reaction mass to obtain an aluminium-containing product, wherein ammonium sulphate is taken in an amount of 10-20% of the mass of the concentrate; before pelletising, the mixture is milled to obtain particles with size of 50-75 mcm in amount of at least 80%; the mixture is fired at temperature of 1690-1750°C; ammonium bifluoride is taken in amount of 0.4-14% of the mass of the sinter; and the reaction mass is calcined at 700-900°C. Before treatment with ammonium bifluoride, the sinter can be treated with 10-20% hydrochloric acid. The degree of extraction of aluminium oxide from the concentrate is increased by 1.3-9.9%. Content of aluminium oxide in the end product reaches 97.7% with content of silicon oxide impurities of 0.13-1.0%.

EFFECT: high content of aluminium oxide in the end product while reducing content of silicon oxide impurities.

3 cl, 6 ex

FIELD: metallurgy.

SUBSTANCE: method involves carbon thermal reduction of oxide compound of rare-earth metal in vacuum so that powder of rare-earth metal carbide, which is free from residues of oxygen impurity, is obtained. Then, it is cooled down and mixed with high-melting metal powder in the ratio that is sufficient for performance of exchange reactions between rare-earth metal carbide and high-melting metal, and mixture is heated with hot volumetric plasma discharge to the temperature of ≥1800°C. With that, evaporating rare-earth metal is collected on condensers and hard-alloy carbide of high-melting metal is obtained. The device includes a vacuum system, cathode and anode assemblies arranged concentrically in the chamber, and a steam line and a condenser-cooler, which are coaxial to them. With that, an internal electrode represents an anode of high-current vacuum plasma discharge burning in an annular discharge cavity formed with coaxial cylindrical electrodes. The anode is made from high-melting electrically conducting material in the form of a crucible having a capacity, and a thin-wall cathode enveloping it, outside which there located is a starting resistance heater, is also made from high-melting electrically conducting material, for example tungsten, tantalum or graphite.

EFFECT: improving extraction of rare-earth metal.

5 cl, 1 dwg

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