A method of processing copper metal waste
(57) Abstract:The invention relates to the field of non-ferrous metallurgy and can be used in the processing of secondary copper-bearing waste. A method of processing involves smelting wastes and their conversion in the vertical Converter with top blowing when fuel and oxygen through the fuel-oxygen burner, located at some distance from the surface of the charge or melt. Defined parameters of the fuel and oxygen, as well as the parameters of their submission for secondary refining of impurities, is provided to simplify the technology and hardware design process. 2 C.p. f-crystals. The invention relates to the field of non-ferrous metallurgy, in particular to methods for processing of secondary copper-bearing materials.A method of refining copper metal waste in a rotating Converter TBRC (U.S. Patent N 4581064). The method involves loading a solid metal waste in a rotary Converter with top blowing, the waste melting and refining of impurities by blowing oxygen-containing gas supplied through immersed in the melt of the tuyere. Working position of the Converter tilting of the 28oThe closest in technical essence is a method of processing copper metal waste technology Isasmelt (Annual Project Review. An MBM publication, 12/99, p. 32-35). The method involves melting of solid waste in a separate unit and converting the molten waste in the Isasmelt furnace by blowing the melt through a vertically-located fuel-oxygen burner, immersed in the melt. Secondary refining of blister copper is carried out in a separate furnace in two stages with the addition of soda and silica. The method allows to process waste to produce blister copper, but its disadvantage is the complexity of the process associated with the need for multiple units to melt the mixture, converting and secondary refining.The aim of the invention is to simplify the process.This objective is achieved in that in the method of processing copper metal waste, including smelting and refining by melt blowing oxygen-containing oxidant supplied together with a gaseous or liquid fuel through the vertically located the fuel-oxygen burner according to the invention the process of melting and refining of lead in pnem charge or melt the oxygen-fuel burner when the coefficient of excess oxygen , equal to 0.8-1.2.In the particular case of refining copper melt from lead, zinc, tin and sulfur may be produced by sequential processing of the melt mixed gas produced by the combustion of fuel with oxygen.The decrease in the Nickel content can be achieved by blowing of the melt with oxygen at the additional expense last 600-1000 nm3per hour, and the temperature of the melt 1150-1200oC for 10 - 30 minutesRecycling of metal waste in a pre-heated vertical furnace with the fuel-oxygen burner located above the level of the charge, allows for smelting, converting and refining of the melt in one unit, which simplifies the process. Flow through the fuel-oxygen burner oxygen and liquid fuels (e.g. fuel oil) or natural gas at some distance from the melt or mixture provides not only the stirring of the melt and its interaction with gases (as in the prototype), but the interaction of the melt with the products of combustion of liquid or gaseous fuel with oxygen.Selected experimentally costs of fuel and oxygen and the ratio of these costs allow for the of oxygen in the operation of the secondary refining due to the sequential processing of copper-containing melt gas mixtures produced during combustion of the fuel in oxygen at less than, equal to and more than 1, the possibility of regulation of the oxidation and transition into the slag separate impurities, which allows for the operation of the secondary refining in the same vertical Converter.At higher flow of oxygen, when > 1,2, is the oxidation of copper and required too much fuel and oxygen for the operation of refining copper melt. At a lower flow rate of oxygen, when the < 0,8, there is an increased consumption of fuel for the smelting and reducing the performance of the unit. While reducing the flow of oxygen and fuel less than these values, you experience slow performance of the unit. While increasing the flow of oxygen and fuel more specified values decreases the resistance of the lining unit.The decrease in Nickel content less than 0.4-0.5% is made by blowing molten copper with oxygen at the additional expense of 600-1000 nm3per hour through the fuel-oxygen burner for 10-30 minutes at a temperature of 1150-1200oC. Purge within less than 10 min is not possible to obtain a metal with a Nickel content of less than 0.5%. The blowing of the melt during the b formation of large amounts of momentum. Blowing copper melt at temperatures above 1200oC due to the increased solubility is not possible to obtain a melt with a Nickel content of less than 0.5-0.6%.Examples of the method
The tests were carried out on an industrial scale 30-ton vertical Converter with the upper oil-oxygen burner. Processing was applied the following wastes: waste electrical production, dust smelters. Vertical Converter is pre-heated by oil-oxygen burner to a temperature of 1250oC, then it downloaded a batch of waste, and through the oil-oxygen burner, not reaching the surface charge of 0.3-0.5 m, was applied to the fuel and oxygen. In the fuel oil. Oxygen flow rate was maintained at 600-1300 nm3per hour, the consumption of fuel oil 400-600 kg/h. After converting and slag conducted secondary refining of copper melt, changing the ratio of fuel and oxygen: initially supported more than 1, by additional oxidation of the remaining impurities and output them into slag. Further, when = 1, producing heating of the melt, and then made the last stage of refining at < 1, the right held by the blowing of the melt with oxygen, moreover, the extra expense it was in the range of 600-1000 nm3per hour, the temperature was maintained at 1150-1200oC, purge time was 10-30 minutes. After secondary refining of copper melt was analyzed for copper, Nickel, lead, zinc, tin and sulfur.Processing of copper metal waste in a vertical furnace top oxygen and fuel through the burner above the melt level, allows for the processing of copper-containing waste in a single unit with the final copper product of the desired composition, %: Cu 98-98,5; Ni 0,4-0,6; Pb - 0,08; Zn - 0,01; Sn - 0,09; S - 0,1; O2- less than 0.1%. This greatly simplifies the technology and instrumentation process. 1. A method of processing copper metal waste, including smelting, converting, by melt blowing oxygen-containing oxidant supplied together with a gaseous or liquid fuel through the vertically located the fuel-oxygen burner, and refining copper melt away impurities, characterized in that the processing of lead in a pre-heated vertical furnace with a supply of liquid fuel, such as MAZ is aspreva at a flow rate of liquid fuel 400 - 600 kg/h or natural gas 400 - 600 nm3/h and oxygen 600 - 1300 nm3/h ratio oxygen excess of 0.8 - 1.2.2. The method according to p. 1, characterized in that the refining of the copper melt from lead, zinc, tin and sulfur produced by sequential processing of the melt mixed gas resulting from the combustion of fuel with oxygen when changing the ratio of the excess oxygen from 0.8 to 1.2.3. The method according to any of the preceding paragraphs, characterized in that the refining of the copper melt from Nickel is produced by melt blowing oxygen through the fuel-oxygen lance for 10 to 30 min at the additional expense of oxygen 600 - 1000 nm3/h and a melt temperature of 1150 - 1200oC.
FIELD: non-iron metallurgy, in particular reprocessing of aluminum waste.
SUBSTANCE: claimed method includes junk charge into premelted flux at ratio of 1:(5-10); heating up to melt temperature; smelting under flux layer, and separation of metal from flux. Equimolar mixture of sodium chloride and potassium chloride with addition of 2.9-52.6 % (in respect to total flux weight) magnesium fluoride is used as flux, and in melting process flux layer with thickness of 4.5-20 cm is maintained. Method affords the ability to conserve original composition and eliminate additional burdening with magnesium.
EFFECT: decreased burn-off loss, especially for magnesium, metal of improved quality.
4 cl, 3 tbl, 5 ex
FIELD: nonferrous metallurgy.
SUBSTANCE: claimed method comprises combining slags using extraction principle with number of extractions n approaching infinity. Depleting agent efficient in presence of reducing agent is selected from materials enriched with pyrite, pyrrotine, calcium sulfide, and calcium sulfate; metal and alloys mainly containing Si, Al, Fe, C, etc. as well as reducing and sulfidizing complexes consisting of sulfides, oxides, and reducing substances (C, Me). Carbonaceous reducers, utilized individually or in mixture, are any known carbonaceous reducers. Degree of metal Me recovery is in accordance with conventional extraction equation.
EFFECT: increased degree of recovery of nickel from slags, reduced consumption of depleting agent, reduced power consumption and loss of sulfur into gas phase.
6 cl, 1 tbl
FIELD: non-iron metallurgy, in particular reprocessing of lead cakes from zinc manufacturing.
SUBSTANCE: claimed method includes heat treatment of lead cake with flux followed by smelting wherein before heat treatment mixture of lead cake, calcium hydroxide, and clinker from lead cake milling is balled to produce pellets. Pellets have fineness preferably of 30-100 mm. Method of present invention affords the ability to increase total coefficient of lead recovery by 3.1 %.
EFFECT: decreased energy consumption and reduced dust content in exhaust gas.
2 cl, 1 tbl
FIELD: noble metal hydrometallurgy.
SUBSTANCE: invention relates to method for acid leaching of platinum method from secondary raw materials, in particular from ceramic support coated with platinum metal film. Target metals are leached with mixture of hydrochloric acid and alkali hypochlorite at mass ratio of OCl-/HCL = 0.22-0.25 and redox potential of 1350-1420 mV.
EFFECT: decreased leaching temperature, reduced cost, improved platinum metal yield.
FIELD: sludge recovery from surface depositions of chemical equipment.
SUBSTANCE: invention relates to method for recovery of sludge containing platinum-group metals from equipment using platinum metal-based catalysts. Method includes treatment with aqueous solution of active chemical agent (e.g. sodium-ammonium-substituted ethylenediaminetetraacetic salts) while controlling pH value and removing sludge retained on treated surface with diluted aqueous solution of mineral salts or mixture thereof. pH value is adjusted at 2-10, preferably at 3-9 by adding of organic acid selected from group containing citric, oxalic, maleic, phthalic, adipic, glutaric, succinic acids or basic agents selected from sodium hydroxide, potassium hydroxide, sodium carbonate or potassium carbonate, and hydrochloric acid, sulfuric acid or phosphoric acid is used as mineral acid.
EFFECT: recovery platinum-group metal with improved yield.
4 cl, 1 tbl, 12 ex
FIELD: rare, dispersed and radioactive metal metallurgy, in particular hydrometallurgy.
SUBSTANCE: invention relates to method for reprocessing of polymetal, multicomponent, thorium-containing radwastes, formed when reprocessing of various mineral, containing rare-earth elements, Nb, Ta, To, V, Zr, Hf, W, U, etc. Method includes treatment of solution and/or slurry with alkaline agent; introducing of sulfate-containing inorganic compound solution and barium chloride; treatment of obtained hydrate-sulfate slurry with iron chloride-containing solution, and separation of radioactive precipitate from solution by filtration. As alkali agent magnesia milk containing 50-200 g/dm2 of MgO is used; treatment is carried out up to pH 8-10; sodium sulfate in amount of 6-9 g Na2SO4/dm2 is introduced as solution of sulfate-containing inorganic compound; barium chloride solution is introduced in slurry in amount of 1.5-3 g BaCl2/dm2. Hydrate-sulfate slurry is treated with solution and/or slurry containing 0.8-16 Fe3+/dm2 (as referred to startingsolution) of iron chloride, followed by treatment with high molecular flocculating agent and holding without agitation for 0.5-2 h. Radioactive precipitate is separated from mother liquor, washed with water in volume ratio of 0.5-2:1; then washed with sodium chloride-containing solution and/or slurry in volume ratio of 0.5-2:1; radioactive precipitate is removed from filter and mixed with mineral oxides in amount of 0.5-0.8 kg MgO to 1 kg of precipitate. Formed pasty composition is fed in forms and/or lingots and presses with simultaneous heating up to 80-1200C.
EFFECT: filtrate with reduced radioactivity due to increased codeposition coefficient of natural Th-232-group radioactive nuclide, in particular Ra-224 and Ra-228, with radioactive precipitates.
10 cl, 1 ex
FIELD: chemical technology; recovery of deactivated and decontaminated radioactive industrial wastes.
SUBSTANCE: proposed method that can be used for deactivating and decontaminating industrial radioactive wastes incorporating Tb-232 and their daughter decay products (Ra-228, Ra-224), as well as rare-earth elements, Fe, Cr, Mn, Sl, Ti, Zr, Nb, Ta, Ca, Mg, Na, K, and the like includes dissolution of wastes, treatment of solutions or pulps with barium chloride, sulfuric acid, and lime milk, and separation of sediment from solution. Lime milk treatment is conducted to pH = 9 - 10 in the amount of 120-150% of total content of metal oxyhydrates stoichiometrically required for precipitation, pulp is filtered, and barium chloride in the amount of 0.4 - 1.8 kg of BaCl2 per 1 kg of CaCl2 contained in source solution or in pulp, as well as pre-diluted sulfuric acid spent 5 - 20 times in chlorine compressors in the amount of 0.5 - 2.5 kg of H2SO4 per 1 kg of BaCl2 are introduced in filtrate. Alternately introduced in sulfate pulp formed in the process are lime milk to pH = 11 - 12, then acid chloride wash effluents from equipment and industrial flats at pulp-to-effluents ratio of 1 : (2 - 3) to pH = 6.5 - 8.5, and pulp obtained is filtered. Decontaminated solution is discharged to sewerage system and sediment of barium and calcium sulfates and iron oxysulfate are mixed up with oxyhydrate sediment formed in source pulp neutralization process; then 35 - 45 mass percent of inert filler, 10 - 20 mass percent of magnesium oxide, and 15 -m 25 mass percent of magnesium chloride are introduced in pasty mixture formed in the process while continuously stirring ingredients. Compound obtained is subjected to heat treatment at temperature of 80 - 120 oC and compressed by applying pressure of 60 to 80 at.
EFFECT: reduced radioactivity of filtrates upon separation of radioactive cakes due to enhanced coprecipitation of natural radionuclides.
7 c, 1 ex
FIELD: chemical technology; deactivation and decontamination of radioactive industrial products and/or wastes.
SUBSTANCE: proposed method designed for deactivation and decontamination of radioactive industrial products and/or production wastes incorporating Th-232 and its daughter decay products (Ra-228, Ra-224), as well as rare-earth elements, Fe, Cr, Mn, Al, Ti, Zr, Nb, Ta, Ca, Mg, Na, K, and the like and that ensures high degree of coprecipitation of natural radionuclides of filtrates, confining of radioactive metals, and their conversion to environmentally safe form (non-dusting water-insoluble solid state) includes dissolution of wastes, their treatment with barium chloride, sulfuric acid, and lime milk, and separation of sediment from solution. Lime milk treatment is conducted to pH = 9-10 in the amount of 120-150% of that stoichiometrically required for precipitation of total content of metal oxyhydrate; then pulp is filtered and barium chloride is injected in filtrate in the amount of 0.4 - 1.8 kg of BaCl2 per 1 kg of CaCl2 contained in source solution or in pulp and pre-dissolved in sulfuric acid of chlorine compressors spent 5-20 times in the amount of 0.5 - 2.5 kg of H2SO4 per 1 kg of BaCl2. Then lime milk is added up to pH = 11 - 12 and acid chloride wash effluents of equipment and production floors are alternately introduced in sulfate pulp formed in the process at pulp-to-effluents ratio of 1 : (2-3) to pH = 6.5 - 8.5. Filtrate pulp produced in this way is filtered, decontaminated solution is discharged to sewerage system, sediment of barium and calcium sulfates and iron oxysulfate are mixed up with oxyhydrate sediment formed in source pulp neutralization, inert filler and 0.5 - 2 parts by weight of calcium sulfate are introduced in pasty mixture while continuously stirring them. Compound obtained in the process is placed in molds, held therein at temperature of 20 - 50 oC for 12 - 36 h, and compacted in blocks whose surfaces are treated with water-repelling material.
EFFECT: reduced radioactivity of filtrates upon separation of radioactive cakes.
8 cl, 1 dwg, 1 ex
FIELD: utilization of secondary raw materials containing iron, zinc and lead, mainly wastes of steel-making process at control of basicity of Waelz process slag.
SUBSTANCE: proposed method includes mixing the charge containing raw materials and chemically active fine-grained carbon carrier, agglomeration and treatment of conglomerates thus obtained in furnace. Treatment is performed in rotary furnace working on counter-flow principle of charge and gas atmosphere; in the course of treatment, part of carbon carrier is fed to conglomerates so that total amount of carbon is lesser than 80% of amount of carbon required for reactions in charge; amount of chemically active fine-grained carbon carrier is strictly substoichiometric relative to all reactions in charge requiring carbon.
EFFECT: enhanced balance of energy of Waelz process; increased productivity; improved quality of wastes.
FIELD: production of aluminum by electrolysis of molten salts; processing wastes of this process.
SUBSTANCE: proposed method includes delivery of solid fluorocarbon-containing wastes and oxygen-containing gas into reactor followed by high-temperature roasting for obtaining secondary raw material for production of aluminum. Finely-dispersed fluorocarbon-containing and sulfur-containing wastes are fed for roasting at weight ratio of fluorine to sulfur no less than 4:1; anode gases of electrolytic aluminum production process taken from organized gas cleaning system are used as oxygen-containing gas. Wastes are delivered in form of suspension in which liquid-to-solid ratio is maintained at 0.5-1.5:1. Proposed method improves operation of electric precipitators and ensures return of compounds in form of secondary high-quality regenerating cryolite.
EFFECT: reduced emissions of toxic agents into atmosphere.