Method of receiving of chrome-bearing alloy |
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IPC classes for russian patent Method of receiving of chrome-bearing alloy (RU 2354735):
 Extraction method of metallic element, particularly metallic chromium, from charge containing metal oxides in arc furnace / 2352672
Invention relates to extraction method of metallic elements, particularly, metallic chromium from slag, which contains oxides, particularly chrome oxide, in arc furnace. Additionally slag is not reduced at separated stage after melting, but there are implemented following stages: after charge introduction into arc furnace it is melted, forming molten metal and slag. Melt is discharged, keeping unreduced slag in furnace. Then it is fed following scrap portion, including reducers for slug. At melting of this charge slag is reduced. Then slag and melt are merged. Method can be used also in aggregates of ladle or convertermetallurgy.
Method of receiving products made of iron with carbon alloy / 2352671
There are received products from alloy of iron and carbon with carbon content more than 2.14 wt % by means of melting, melt heating till the temperature for 400-600°C higher of eutectic temperature, isolation at this temperature no less than 10 minutes, ingot plastic deformation at the temperature higher than 600° and following cooling till the ambient temperature in water. Sulfur content in alloy is provided, not exceeding 0.001 wt %, phosphorus - not exceeding 0.01 wt %.
Melting method of ferrotitanium / 2351678
Invention relates to metallurgy field. Particularly it relates to production of ferroalloys by aluminothermy process. In the method in the capacity of titanium-bearing raw material it is used liquid titanic slag, it is mixed metallothermic part of charge, consisting of iron-ore concentrates, aluminium powder, lime and ferrosilicium in relation 1:(1.09-1.18):(0.27-0.33):(0.08-0.09) agreeably, in amount 126-146% of titanium slag mass, then it is mixed and penetrate main part of charge, consisting of iron-ore concentrate, lime and aluminium powder in relation 1:(0.1-0.29):(0.43-0.46) agreeably, in amount 15-25% of titanium slag mass. In the capacity of titanium-bearing raw material it is used liquid titanic slag with content 85-95% % TiO2 at temperature 1700-1850°C.
 Method of concentrates treatment from ore, containing oxides of ferric, titanium and vanadium and facility for its implementation / 2350670
Method is implemented by means of liquid-phase recovery of metals from oxides of concentrate batches, consisting of main and additional parts, in conditions of melt revolution by electromagnetic field. During the melting it is effectively used centrifugal effect, accelerated fused fed for melting charge, containing concentrate, and in it there are selectively recovered metals from oxides. At that likewise accelerated iron is diluted in aluminium while production of ferroaluminium. Method is implemented almost excluding gas emission from melt. Facility for method implementation is outfitted by collector circulating ferrosilicium that simplifies process of charge treatment, reduces treatment time of each regular charge batch. Under the bottom of circulating ferrosilicium collector there are located induction units which are equal in structure to induction units, located around walls and under the bottom of assembly that provides decreasing of costs for induction units manufacturing and for electricity supply.
Method of manganese ore reducing fusion / 2348727
Invention concerns pyrometallurgy. Particularly it concerns production of ferromanganese, and provides excluding of formation of dump waste slag at extraction of manganese from ore. In method it is implemented forming in furnace of reactionary capacity on the basis of fluorite melt, charging and reducing fusion of manganese ore, discharge from furnace of slag and ferromanganese. Before discharge from furnace of slag and ferromanganese into reactionary capacity it is add manganese ore in amount, depending on content of manganese in ore, content of manganese in slag and slag mass in furnace, till the receiving of slag with content 10-20% of manganese, used for preparation of welding flux.
 Charge for melting of high carbon ferromanganese / 2347835
Invention refers to metallurgy, particularly to processing of manganese raw material by melting in ore reducing furnaces. Charge contains manganese raw material, carbon reducer and flux. As manganese raw material there is used mixture of concentrate of rare phosphorous manganese ore with ratio P/Mn=0.0052-0.042 and high grade manganese ore with ratio P/Mn≤0.0021 at following ratio of components, wt %: carbon reducer 12-18, flux 8-20, concentrate of rare phosphorous manganese ore with ratio P/Mn=0.0052-0.042 5-40, high grade manganese ore with ratio P/Mn≤0.0021- the rest. The invention facilitates processing low grade native manganese containing materials.
 Method of electroslag melting of ferrotitanium / 2346994
Invention refers to special electrometallurgy and is designed for production of ferrotitanium of high quality out of titanium and steel chips. Melting of titanium and steel chips is performed in a slag bath in a water-cooled crystalliser by means of supply of electric current into slag through a non-consumable graphite electrode. Chips are loaded into the crystalliser by portions at amount of 20-50% from the total weight of chips. After melting of each portion of chips density of current is lowered at the electrode at 50-70% relative to density of current of melting and holding is carried out at lowered current density during 1-5 minutes. Further next portion of chips is melted.
Method of alumino-thermal production of ferro-titanium / 2338805
Invention refers to metallurgy of high-melting rare metals, particularly to metallurgy of titanium, and can be used at production of ferro-titanium for alloys on base of titanium and structural items. The method consists in out-of-furnace alumino-thermal reduction; ore titanium concentrates are used as titanium containing element of charge; elements of charge are mixed till obtaining the ratio of iron and titanium oxides 1:(1.0÷3.0) of wt, calcium oxide 0.2÷0.5 from the total weight of titanium and iron oxides and aluminium till obtaining ratio of total contents of titanium and iron oxides to aluminium as 1:(0.45÷0.55). Before reduction charge is heated to the temperature of 800-1000°C in inert medium and held to equalise temperature in charge volume; the process of reduction is initiated by firing of charge followed by heating turn off.
 Method of melting of ferronickel out of oxidised nickel ores and products of their concentration and assembly for implementation of this method / 2336355
Inventions refer to metallurgy and can be used fro production of ferronickel with various contents of nickel out of Ural and other oxidised nickel ores. The assembly is equipped with injectors for blowing dust into slag melt, the said dust caught in gas cleaning system while carried out with exhaust gases out of a chamber. Fuel oxygen burners are installed in side walls of the chamber above the level of the slag melt at 0.5-1.2 m at an angle of 15-60° to the surface of the melt and at an angle of 35-65° to the lengthwise axis of the assembly, while nozzles of the injectors for blowing into the slag melt carbon containing materials and dust caught in gas cleaning and carried off with exhaust gases out the chamber are installed at 0.25-0.60 m above the level of reduced metal. Heat exchangers of cooling circuit of liquid metal heat carrier are connected via nitrogen lines with injectors installed in the walls of the chamber, the said injectors facilitate injection of carbon containing materials and caught in gas cleaning and carried off by the exhaust gases out of chamber dust in a stream of heated nitrogen.
 High titanium ferro alloy produced by two stages reduction out of ilmenite / 2335564
Invention refers to high titanium ferroalloy, produced by two stages melting in electric furnace; alloy is used as alloying component at production of steel with high level of physic-mechanical properties. For producing of ferroalloy the charge prepared out of ilmenite, iron and/or steel scrap, crushed electrodes and/or coke, lime and/or lime stone is used; then slag containing titanium oxide and part of iron melt on the first stage are withdrawn; a consumable electrode in a steel coat is melted under the layer of flux; the said electrode contains crushed slag of the first stage and aluminium as filler. Ferro alloy contains components at a following ratio, wt %: titanium 68.02-78.7; iron 19.32-30.0; impurities to 1.98.
 Method of regeneration of metallic chromium from slags containing chromium oxide / 2247161
Proposed method is used for converter processes such as AOD, MRP, AOD-L, MRP-L, CLU, ASM, Conars-Stainless steel, or vacuum processes such as VOD, SS-VOD, RH and RH with use of oxygen lance. Slag formed at the end of blowing and treatment in converter or vacuum plant is drained and removed in unreduced state; this slag is fed to electric furnace which is loaded with standard charge consisting of metal scrap and residual dust; then carbon is additionally fed and silicon if necessary; during melting, chromium oxide contained is slag is reduced by means of carbon and silicon.
 Method of production of complex siliceous ferro-alloy / 2247169
Proposed method includes loading the furnace and fusion of charge containing quartzite and briquetted blend of ore part of charge with excessive carbon reductant required for reducing the main elements at lack of reductant in charge. Reduction intensifying agent and wastes of process are additionally introduced into blend for briquetting of ore part of charge with carbon reductant; wastes have form of ferro-alloy at size lesser than 1 mm, slag and sublimates in the amount of 2-10% and 1-15%, respectively. Used as intensifying agent are copper and nickel sulfides and/or oxides, borate ore and fluorspar.
 Method for producing ferrosilico-aluminum in ore heating furnace / 2251586
Method comprises steps of using coal -containing rock with carbon content 5 -35 % as silicon- and aluminum-containing material. Melting is realized while keeping during process lack of carbon in charge loaded to furnace in range consisting 3 -12% of stoichiometric quantity due to adding coke and (or) quartzite to coal containing rock. Invention provides stabilized process of melting out silicon-aluminum alloys with aluminum content 5 -35%.
Method of alumino-thermal production of ferro-niobium / 2258095
Proposed method includes stage-by-stage loading and melting of charge containing niobium concentrate, sodium nitrate, lime, iron ore, aluminum and drainage products of melt; used as niobium concentrate is commercial niobium concentrate. At first stage, charge is loaded at rate of 300-380 kg/m2/min; this charge contains total mass of commercial niobium concentrate and sodium nitrate, 30-70% of iron ore of mass of melt, 20-80% of lime of mass of melt and aluminum in the amount of 0.85-0.99 of amount stoichiometrically required for reduction of elements of ferro-niobium alloy; at second stage, charge is loaded in the amount of 35-55% of mass of niobium pentoxide in commercial niobium concentrate of first stage at rate of 210-270 kg/m2/min, 30-70% of iron ore of mass of melt, 20-80% of lime of mass of melt and aluminum in the amount of 1.6-2.0 of amount stiochiometrically required for reduction of elements of ferro-niobium alloy; before draining, melt is held during period equal to 0.1-0.6 of charge melting time.
 Pyro-metallurgic plant for concentration of titanium-silica concentrates / 2258759
Plant has transport means and device for forming current-conductive channel, made in form of cylinder with radial ribs, inner diameter of which is equal to two diameters of electrode, and mounted at furnace bottom. Graphite-covered electrode is mounted in furnace body coaxially with relation of inner furnace diameter to electrode diameter equal to 2 : 8, while furnace body is made in form of water-cooled crystallizer, is mounted on transporting means and connected to minus, and electrode - to plus of direct current power block. Radial plates of means for forming radial current-conductive channel are rigidly connected to cylinder, while length of two radial plates plus outer diameter of cylinder match inner diameter of furnace.
 Method for concentration of titanium-silica concentrates / 2258760
Method includes melting in water-cooled crystallizer, into which at bottom a layer of non-electric-conductive source material is placed and in the center of it a channel is formed with diameter approximately equal to two electrode diameters, which is filled by current-conductive material. After that crystallizer Is connected to minus, and electrode with plus of direct current power block and electrode is lowered until touching current-conductive material until appearance of stable arc, and after start of crystallization of titanium slurry main working period is begun - accumulation of slurry block, during whole period of which periodically before end of melting portion loading of material of given compound is performed. Current-conductive material is formed by adding to source material not less than 33% of breeze coke from mass o source material.
 Method of obtaining ingots of initial alloy for production of amorphous bands / 2260070
Proposed method includes melting of main charge, introduction of alloying elements, complete melting, cooling to pouring temperature and pouring to ingot mold from above. Main charge contains waste amorphous band of the same composition in the amount of 5-80 wt-% of mass of charge at bulk mass equal to 18-20% of density of initial alloy. Proposed method makes it possible to reduce amount of nonmetallic inclusions in ingots, to avoid choking of calibrated nozzle and to reduce action of melt on quartz crucible. Yield of good amorphous bands is increased from 52.6% to 79.3-87% and consumption of quartz crucibles is reduced by 50%.
Method for thermal melting of metal / 2269585
Method involves preparing burden mixture; charging burden mixture into melting crucible of reaction chamber; creating low pressure in reaction chamber and initiating reaction process; providing melting simultaneously under low pressure in reaction chamber and under pulsing pressure in crucible melting space, said pressure in crucible being created by accumulating and periodic discharging through crucible cover into reaction chamber space of gaseous melting process products. Weight of cover is selected on condition that desirable working pressure may be created in crucible melting space. Melting process is conducted under low pressure of 10-5 - 600 mm of mercury column in reaction chamber and under gas pressure of 0.1-10 atm in crucible.
Method of smelting of ferroaluminum with the reduced consumption of the pure aluminum / 2272851
The invention is pertaining to the field of metallurgy, in particular, to the versions of smelting of ferroaluminum used for a steel deoxidation. In the first version the process of smelting of the ferroaluminum is conducted in two separate induction furnaces by separate melting of the steel and aluminum scrap at the temperature exceeding the fusion point of the each particular scrap by 50-70°C, tapping of the melt of aluminum with a fluidic protecting slag into the induction furnace containing the melt of the steel, heating of the melts within 5-10 minutes up to their complete stirring. In the second version the process of the ferroaluminum smelting is conducted in two induction furnaces by the separate melting of the aluminum scrap and the steel scrap, which is added by batches in amounts determined by the charge smelting process to the residual smelt, remained after the previous smelt of the ferroaluminum, tapping of the aluminum melt with the fluidic protecting slag into the induction furnace containing the melt of ferroaluminum with the low content of aluminum, heating within 5-10 minutes up to the complete stirring. The invention ensures reduction of consumption of the pure aluminum into the melting loss up to 6 %, a decrease of the duration of the smelting process by 2-2.5 hours with the corresponding growth of the volumes of the production.
 Low hood of an open ore regenerating electric furnace / 2272976
The low hood of an open ore regenerating electric furnace has a lid, lateral walls and a mobile screen. On the lid it has openings for current inputs and leaking pipes. On lateral walls it has intaking windows of gas conduits and branch pipes for feeding blast-furnace gases with overlapping of the gap between the flange of the furnace and the lateral windows of the hood with a mobile screen. The hood is fulfilled in the shape of a stepped pyramid with lateral walls of a smaller diameter and a mobile screen of a larger diameter; the intaking windows of the gas conduits of rectangular cross-section are placed tangentially and directed relatively to each other at 1800.
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FIELD: metallurgy. SUBSTANCE: invention can be used for processing of chrome ore, concentrates and aluminium-bearing wastes of non-ferrous metallurgy. In the method in the capacity of aluminium-bearing material it is used preprepared aluminium-bearing wastes from manufacturing of secondary aluminium in amount 0.6-1.1 wt % per 1 wt % of content Cr2O3 in chrome-ore concentrate. Isolation of received in furnace melt is implemented with blending during 10-15 minutes, after which it is preliminary pumped out in slag pan 70-90% of dross major part from the total dross mass, then it is pumped out part of the rest slag into metallic reservoir, isolated during 3-5 minutes and discharged the rest part and metal to the same metallic reservoir. EFFECT: invention provides developing of the new technology of chrome-bearing alloy, providing substitution of expensive reductant by significantly cheaper aluminium-bearing wastes from the aluminium production and increasing of extraction ratio of chrome into the metal. 1 ex, 1 tbl
The invention relates to the field of ferrous and nonferrous metallurgy, in particular to the processing of chromium materials recovery smelting in electric furnaces can be used for processing of chromite ores, concentrates and aluminium-containing wastes of non-ferrous metallurgy. A method of obtaining chromium alloys which are widely spread in Russia for the production of medium and low carbon grades of ferrochrome, which includes crushing and drying of chromite ores, recovery silicothermic melting with the use of pig ferrosilicochromium and subsequent casting of the resulting metal. As part of the reducing agent is used, the silicon contained in ferrosilicochromium [Karnaukhov NR. Technology of low-carbon ferrochrome. / Vinkenoog, Wieroo, VPIM, Viewsnov. - Ekaterinburg: Ural branch of the Russian Academy of Sciences, 2001. - 482 S.]. The main disadvantage of this method is its two-phase process, justified by the necessity of melting the first stage carbothermic method of pig ferrosilicochromium in rudovosstanoviteljnoj electric furnaces, which requires involvement in the production cycle additional smelting capacity. As a prototype adopted is close to the technological nature of the claimed method of obtaining chromodorididae, which includes preparation chromacoding material with obtaining chromacoding concentrate and its mixing with aluminium-containing and fluxing materials, melting and aluminothermic the recovery furnace, the extract obtained melt consisting of slag and metal, and the production of metal and slag in the metal reservoir. As part of the reducing agent is aluminum contained in the aluminum powder [Lyakishev I.E. Aluminothermy. / Neplaceri, Ullinger, Graignamanagh, Shilpa. - M.: metallurgy, 1978. - 424 S. (prototype)]. The advantage of this method is the possibility of obtaining low-carbon ferrochrome one-step method due to the exclusion of the charge composition of pig ferrosilicochromium. The main disadvantage of this method is the use of expensive reducing agent is aluminum powder, the high cost of which was one of the main reasons for low utilization aluminothermic method for the production of ferrochrome in the domestic metallurgical enterprises. The present invention is to develop a new aluminothermic method of producing chromium alloy that allows you to replace expensive aluminum powder is much cheaper aluminium-containing reducing agent. - The m result of the present invention is to improve the extraction of chromium in the final metal melt due to the better dispersion of the volume element reductant, what a positive effect on the kinetics and mechanism of the process of recovery of chromium. This technical result is achieved in that in the method of obtaining chromium alloy, including the preparation chromacoding material with obtaining chromacoding concentrate and its mixing with aluminium-containing and fluxing materials, melting and aluminothermic the recovery furnace, the extract obtained melt consisting of slag and metal, and the production of metal and slag in the metal reservoir, according to the invention as aluminium-containing material use prepared containing aluminum production waste recycled aluminum in an amount of 0.6-1.1 wt.% 1 wt.% Cr2O3in chromium concentrate the extract obtained in the furnace melt is carried out with stirring for 10-15 minutes, after which pre-download Slavny 70-90% of the main part of the ash from the total weight of the slag, then download some of the remaining slag in the metal reservoir, soak in for 3-5 minutes and let the rest of slag and metal in the same metal reservoir. The essence of the invention is that the inventive method of obtaining chromium alloy allows you to create an electric furnace conditions necessary for smelting medium and low carbon grades of f is rrogram with a content of from 60 to 80 wt.% chrome without the use of expensive aluminum powder. The proposed method for chromium alloy allows you to use the cheapest form a reducing agent - containing aluminum waste from aluminum production. The inventive method also allows you to engage in recycling waste production of non-ferrous metallurgy. Chromology material before melting must be crushing to achieve the particles less than 3 mm, drying and calcination to remove residual moisture and carbon reduction. Aluminium-containing wastes from aluminium production also need to be pre-preparation: crushing, beneficiation method of separation to obtain metalloconcentrate containing 40-70% aluminum metal, and averaging. Before melting it is necessary to conduct a thorough mixing of the charge materials that are substantiated by a large difference in the densities of chromacoding and aluminium-containing materials. The quality of mixing in the melting chromium alloys of the proposed method depends on the degree of extraction of chromium in the metal and the aluminium content in the final product, which is limited by the requirements of GOST 4757-91 - not more than 0.2% of aluminum in the low carbon grades of ferrochrome (FH-FH). The amount of aluminium-containing waste equal to 0.6-1.1 wt.% 1 wt.% Cr2O3in chromium concentrate, is not sufficient that the are for full recovery of chromium, but iron from oxide melt. Moreover, the lower limit of the amount of aluminium-containing waste refers to more rich in aluminium metalloconcentrate, and the upper limit is more poor. The reduction in the number of aluminium-containing waste in the mixture is less than 0.6 wt.% 1 wt.% Cr2O3in chromium concentrate will reduce the degree of extraction of chromium in the metal due to the lack of aluminum for the flow reduction reactions in full. The increase in the number of aluminium-containing waste in charge of more than 1.1 wt.% 1 wt.% Cr2O3in chromium concentrate will lead to the unreasonable waste of a reducing agent, a deterioration of technical and economic indicators of melting and the formation of ferrochrome with a high aluminium content. After flow reduction reactions produce an extract of the melt in the oven for 10-15 minutes with stirring, allowing deeper refining molten metal and more complete recovery of chromium in the metal due to the deposition of small Korolkov metal from the slag phase. After exposure produces downloading the main part of the slag (70-90% of the total weight of slag) in a special Slavny. Then release of the remaining slag (30-50%) in the metal reservoir, produce exposure for 3-5 minutes and let the rest of the slag metalla in the same metal reservoir. Additional refining of the metal passing through the slag melt, increases the extraction of chromium and lower carbon content in the final product. The invention is illustrated by the following examples. The inventive method of obtaining chromium alloy was tested in laboratory conditions GU Institute of metallurgy, Ural branch of the Russian Academy of Sciences. We used the following materials and equipment: 1. The raw materials. Concentrate chromite ore containing, in wt.%: 58,1 Cr2About3, 11,0 Fetotal, 16,5 MgO, 1,1 Al2O3, 3,4 SiO2. 2. The reducing agent. Aluminum powder with a content of 98 wt.% Al. The aluminium-containing metalloconcentrate prepared by separation of waste from secondary aluminum production: elumalai (20,9 wt.% Al) and wall accretions (waste collected from the surface of the working space of the furnace and auxiliary equipment after a series of heats for the production of secondary aluminium with an average content of 35.2 wt.% Al). For experimental heats were produced two types of metalloconcentrate: - poor with 40 wt.% Al; rich with 70 wt.% Al. 3. The flux. Lime pulverized quick burned with Cao content of 88 wt.%. 3. Muffle furnace. 4. The Electric Furnace Of Tamana. The procedure of smelting was next. All scrap materials were supplied by the faction is the Eney 3 mm Concentrate chromite ore was pre-progulivali in a muffle furnace for 2 hours at 700°C. the Calcined ore is thoroughly mixed with aluminium-containing metalloconcentrate and lime (quantity of lime was taken from the calculation of 60% by weight of metalloconcentrate) and loaded in corundum crucibles, which were placed in the working space of the furnace. After that, the temperature in the furnace was raised, spent the melting of the charge and aluminothermic recovery of chromium and iron. Upon completion of the reduction reactions of the melt was kept in the oven for 14 minutes with stirring. The major part (75 wt.%) slag was downloaded. Then in the preheated metal reservoir spent removing part of the remaining slag (40%) and after 3 minutes was released the rest of slag and metal in the same metal reservoir. Main indicators of the experimental heats are presented in the table. All the bottoms in the carbon content in the final metal does not exceed 0.1 wt.%. The tests showed that the proposed method for chromium alloy allows you to melt in an electric furnace low carbon grades of ferrochrome from chromacoding materials and aluminium-containing wastes from aluminium production without the use of the mixture of aluminum powder. Comparing technological characteristics melting offer is the procedure and prototype it should be noted that when approximately equal to the chromium content in the final alloy (table - melting No. 1, 3, 4) in the proposed method, the increase of extraction of chromium in the metal (from 88 to 90%) due to better dispersion element of the reducing agent by volume. The economic effect from the use of the proposed invention is achieved mainly through the use of cheap types of reducing agent - containing aluminum waste of non-ferrous metallurgy instead of expensive aluminum powder.
The method of obtaining chromium alloy, including the preparation chromacoding material with obtaining chromacoding concentrate and its mixing with aluminium-containing and fluxing materials, melting and aluminothermic the recovery furnace, the extract obtained melt consisting of slag and metal, and the production of metal and slag in the metal reservoir, characterized in that as the aluminium-containing material use prepared containing aluminum production waste recycled aluminum in an amount of 0.6-1.1 wt.% 1 wt.% Cr2O3in chromium concentrate the extract obtained in the furnace melt is carried out with stirring for 10-15 min, after which pre-download Slavny 70-90% of the main part of the ash from the total weight of the slag, then download some of the remaining slag in the metal reservoir, incubated for 3-5 min and let the rest of slag and metal in the same metal reservoir.
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