Extraction of cobalt from aqueous solutions
The method can be used in ferrous and nonferrous metallurgy, as well as for the treatment of industrial and domestic wastewater. Removing cobalt from the aqueous solution includes a contact solution and a solvent, stirring the mixture, settling and separation of phases. As a solvent, a mixture of oleic acid and triethanolamine. The extraction is carried out at pH 5-10 for no more than 5-10 minutes enhanced extraction of cobalt from aqueous solution in a wide range of pH in the extraction process and the intensification of this process. table 1. The method of extraction of cobalt from aqueous solutions relates to the field of extraction of substances organic extractants from aqueous solutions and can be used in ferrous and nonferrous metallurgy, as well as for the treatment of industrial and domestic wastewater.Known methods of extraction of cobalt by extraction with use as extractants derivatives of phosphoric, phosphonic and phosphinic acid [J. Preston S. Hydrometallurgy, 1982, V. 9, 2, R. 115-133. Reckelton W. A., D. S. Flett Solv. Extr. And Jan. Exch. 1984, v.2, 6, p.815-838].The disadvantage is the narrow range of pH efficient extraction.The closest technical solution is akov, C. F. Travkin, S. B. Kochukhov and other Extraction of cobalt and Nickel from sulfate solutions acidic organophosphorus reagents. Non-ferrous metals. 1989, 7, S. 58-62]. Extraction of cobalt solutions izodolasytonecyl acid (IDF) in kerosene reaches its maximum at pH 4-5.The disadvantage of a narrow range of pH efficient extraction.Object of the invention is the creation of an effective and selective method of extraction of cobalt from aqueous solutions in a wide range of pH.The technical result that can be achieved by carrying out the invention, lies in the high degree of economy, efficiency and selectivity of extraction of cobalt from aqueous solutions in a wide range of pH.This technical result is achieved by the fact that in the known method of extraction of cobalt from aqueous solution, including contact solution and a solvent, stirring the mixture, settling and separation of the phases, as a solvent, a mixture of oleic acid and triethanolamine, and the extraction is carried out at pH 5-10 for no more than 5-10 minutesThe essence of the method is illustrated in the data table, which shows the contact time of the phases at a given pH value, the concentration of cobalt is red concentrations of cobalt in the organic and aqueous phases, also specify the color of the organic and aqueous phase at the end of the process.The extractant was added to the original solution of cobalt sulfate volume 190 cm3at 10 cm3(5 vol%). Stirring and maintaining the set value of pH was carried out up until further acid-base characteristics of the system were changed slightly. However, for greater assurance of achieving equilibrium contact organic and aqueous phases was carried out at least one day. Upon reaching equilibrium between the organic and the clarified aqueous phase the organic phase was separated from the water, the latter was determined by the pH value and the residual concentration of cobalt. To maintain the pH of the solution during the extraction of cobalt as neutralizers used solutions of alkali NaOH and acid (H2SO4.Using the values of the concentrations of cobalt in aqueous solution - the original and after extraction, the expected coefficient of the distribution of cobalt between the organic and aqueous phases.Examples of practical application.Experimental data obtained at room temperature, are presented in the table.In the examples the original aqueous solution contained with the for 5-10 min, in the future, the pH value was changed slightly.Volumes of organic and aqueous phases are changed compared to the original slightly: the amount of organic - does not change, the water is in the range of 0.8-1.0.The diluent is kerosene.Extraction is carried out at pH 3-10, pH > 11 in the day of separation into aqueous and organic phase did not occur.The best results of extraction of Co(II) obtained at pH 7-9 and time of extraction 9-10 min: the maximum value of the distribution coefficient D = 13-20.The diluent - gas.Extraction is carried out at pH 5-10, at pH > 11 in the day of separation into aqueous and organic phase did not occur.The best results of extraction of Co(II) obtained at pH 5-10 and time of extraction 5-8 min: the maximum value of the distribution coefficient D = 17-65.The diluent - engine oil.Extraction is carried out at pH 5-8, at pH > 8 during the days of the separation of aqueous and organic phase did not occur.The best results of extraction of Co(II) obtained at pH 8 and the extraction time 5 min: the maximum value of the distribution coefficient D = 16.The proposed method is compared with the prototype increases the extraction of cobalt from aqueous solution in Shiro is ecene cobalt can be applied when processing processing solutions, industrial enterprises sewage, sludge after sedimentation of heavy metals electroplating plants, mine and mine water solutions heap and underground leaching, etc.
ClaimsThe method of extraction of cobalt from aqueous solution, including contact solution and a solvent, stirring the mixture, settling and separation of the phases, characterized in that as a solvent, a mixture of oleic acid and triethanolamine, and the extraction is carried out at pH 5-10 for no more than 5-10 minutes
FIELD: autoclave hydrometallurgy, in particular hydrometallurgical reprocessing sulfide concentrates.
SUBSTANCE: method for reprocessing of sulfide concentrates with high content of pyrrotine includes blending of raw concentrate with mineral stabilizing additive; autoclave oxidative leaching of produced mixture in aqueous pulp under oxygen pressure at temperature above the sulfur melting temperature in presence of surfactant to convert non-iron metals into solution, sulfur - to elementary form, iron - to oxides; deposition of non-iron metal sulfides from oxidized pulp solution followed by recovery of non-iron metal sulfides and elementary sulfur by flotation into multiple sulfur-sulfide concentrate and iron oxides into rock refuse. Alkali or alkali-earth compounds with aluminum silicate are used as stabilizing additive, added at mass ratio of pyrrotine to total silica and alumina content of 1:(0.05-0.33) and mass ratio of copper to pyrrotine <1:55; or at mass ratio of pyrrotine to total silica and alumina content of 1:(0.5-0.8) and mass ratio of copper to pyrrotine 1:55 or more. Pyrrolitine decomposition ratio is at least 95 %, and leaching yield of sulfide mass is not less than during treatment of common pyrrotine concentrate.
EFFECT: improved method for reprocessing of sulfide concentrates.
9 cl, 1 tbl, 4 ex
FIELD: autoclave metallurgy of fused copper-nickel sulfide materials used in reprocessing of copper-nickel mattes and Bessemer mattes.
SUBSTANCE: claimed method includes oxidative atmospheric leaching of grinded material with reversible copper-containing solution from autoclave refining of copper product at elevated temperature and with pulp aeration with oxygen-containing gas for partial nickel conversion into solution and simultaneous copper deposition. Nickel solution is separated from iron and cobalt followed by electroextraction nickel isolation to produce nickel cathodes and reversible nickel anodic liquor. Solid residue from atmospheric leaching is oxidative leached in autoclave under excessive oxidative gas pressure by using copper and sulfuric acid-containing solution. Formed copper product is separated in autoclave from nickel, cobalt and iron with copper sulfate solution at elevated temperature and excessive water steam pressure to produce pulp used in isolating copper by common methods sulfide concentrate collecting platinum group metals and reversible copper-containing solution for atmospheric leaching of raw material. Oxidative atmospheric leaching is carried out using platinum electrode and silver chloride reference electrode at pulp redox potential of (+95)-(+245) mV, temperature of 90-118°C, partial oxygen pressure 0.08-0.25 MPa in presence of sodium sulfate and water-soluble iron ions in ratio iron/sodium sulfate in starting pulp solution of (0.002-0.035):1. Starting mass ratio of copper ions in pulp solution and nickel in solid residue from atmospheric leaching is maintained at (0.02-0.15):1. As sulfate solution for oxidative leaching in autoclave reversible nickel anodic liquor with addition of predetermined copper ion amount is used. Sulfate solution containing copper and sulfuric acid is obtained by addition in reversible nickel anodic liquor calculated amount of copper-containing solution.
EFFECT: copper sulfide concentrate with decreased nickel and iron content; simplified and lower cost equipment; reduced sulfur conversion into solution.
5 cl, 1 tbl, 3 ex
FIELD: metallurgy; complex processing of copper concentrate.
SUBSTANCE: proposed method includes sulphatizing roasting of starting concentrate and leaching-out of cinder at separation of metals; sulphatizing roasting of starting copper concentrate is performed in air at temperature of 500-600°C continued for 980-180 min; cinder thus obtained is leached-out with sulfuric acid solution or water at separation of cake and filtrate; copper is extracted from filtrate by electrolysis. Dried cake is blended with oxidizing agent and chlorides of alkaline and alkaline-earth metals and is subjected to heat treatment at temperature of 450-550°C for obtaining the cake which is leached-out by hydrochloric acid; noble metals are separated from filtrate by sorption method.
EFFECT: enhanced efficiency of extraction of metals; reduced power requirements; enhanced ecological safety.
9 cl, 1 dwg, 1 tbl, 3 ex
FIELD: hydro-metallurgy; reworking iron cakes containing non-ferrous metals, nickel and cobalt in particular; utilization of by-products of hydro-metallurgy for return of valuable components to technological process.
SUBSTANCE: moist cake is subjected to treatment with sulfuric acid in presence of ferric chloride (III) introduced in the amount of 4.5-7.5 mass-% of FeCl3 relative to Fe2O3 contained in pulp. Then, iron is reduced to bivalent state by sodium sulfite solution at concentration of 150-260 g/l at mass ratio of Fe2O3:Na2SO3=(0.18-0.23):1 at simultaneous deposition of iron in form of ferric sulfite (II) which is subjected to thermolysis in boiling mode continued for 0.5-1.5 h for forming hydrated ferrous oxide (II) which is separated from solution by filtration containing ions of non-ferrous metals; then, it is washed and subjected to heat treatment at 400-440°C for 0.5-1.5 h for forming ferric oxide (III). Thermolysis of ferrous oxide (II) may be performed under rarefaction; sulfur dioxide separated at this is neutralized with soda for obtaining sodium sulfite solution which is directed to iron reduction stage. Ferric chloride (III) solution may be obtained through treatment of part of iron cake in the amount of 3.5-5.5 mass-% of concentrated hydrochloric acid taken in stoichiometric amount relative to iron contained in cake. Proposed method makes it possible to increase extraction of non-ferrous metals iron cake to 96.5-98.5% at simultaneous obtaining ferric oxide (III) powder possessing pigment properties at reduced content of admixtures of non-ferrous metals.
EFFECT: facilitated procedure.
6 cl, 6 ex
FIELD: metallurgy; hydrochemical methods of a complex processing of a multicomponent, polymetallic scrap.
SUBSTANCE: the invention is pertaining to the field of metallurgy, in particular, to the hydrochemical methods of a complex processing of a multicomponent, polymetallic scrap used in nonferrous metallurgy with extraction of valuable components and production of various commercial products. The technical result at reprocessing and neutralization of wastes of production of titanium tetrachloride consists in concentration of radioactive metals in the "head" of the process, transfer of the secondary wastes of production in an ecologically secure form suitable for a long-term entombment and-or storing, as well as in production of an additional commercial products - deficient and expensive black thermo- resistant inorganic pigments based on iron oxides, manganese and copper oxides. The method provides for a discharge of the spent melt of titanium chlorates into water; concentrating of a pulp by circulation; the pulp thickening; settling of metals oxyhydrates from the clarified solutions in succession in three stages: on the first stage - conduct a settling at pH = 3.-5.0 with separation of the formed settling of hydroxides of chrome, aluminum and scandium from the solution; on the second stage - conduct settling at presence of an oxidizing agent at pH = 2.5-3.5 within 20-50 hours with separation of the settling; on the third stage - conduct settling at pH = 9.5-11.0. The pulp at its circulation and concentration is added with sodium sulfite in amount of 5 - 15 g/dm3, then after circulation the pulp is treated with a solution of barium chloride in amount of 10-20 g/dm3 for cosettling of ions of thorium and radium, in the formed pulp of the first stage of settling introduce a high-molecular flocculant, and before settling process on the third stage of the process the solution is previously mixed with copper(II)-containing solution formed after lixiviation of a fusion cake of the process of cleanout of the industrial titanium tetrachloride from vanadium oxychloride by copper powder, then the produced settling of iron, manganese and copper oxyhydrates is filtered off, cleansed, dried and calcined at the temperature of 400-700°C.
EFFECT: the invention allows to concentrate radioactive metals in the "head" of the process, to transfer the process secondary wastes in the ecologically secure deficient and expensive black thermo-resistant inorganic pigments.
5 cl, 1 ex
FIELD: extraction of zinc from zinc ore by means of halogenide-based leaching-out solution; removal of manganese from halogenide solutions of zinc and other metals.
SUBSTANCE: extraction of metallic zinc from zinc mineral includes the following stages: leaching-out of zinc mineral with solution containing halogenide compound of two or more halogenides, electrolysis of solution for obtaining metallic zinc and generation of halogenide compound and return of electrolyzed solution containing halogenide compound to leaching-out stage. Part of electrolyzed solution may be removed in form of flow escaping from cathode section of electrolyte cell of electrolysis process and may be treated for removal of manganese in form of manganese dioxide by addition of limestone and halogenide compound from anode section of electrolysis process. In this case pH and Eh of solution may be controlled by method enhancing formation of sediment of manganese dioxide as compared with formation of zinc sediment. Proposed method is characterized by low operational and capital outlays as compared with well-known methods, extraction of noble metals from solutions, tolerance to low-grade and contaminated concentrates.
EFFECT: reduced power requirements; avoidance of emission of liquid and toxic gases; low temperature and atmospheric pressure in carrying-out operations.
20 cl, 4 dwg, 6 tbl, 9 ex
FIELD: chemistry of organophosphorus compounds, chemical technology.
SUBSTANCE: invention relates to novel compounds used for extraction of rare-earth metal ions and comprising phosphoneamide compound represented by he formula : wherein R1 means aryl group, aralkyl group under condition that each group can comprise a substitute chosen from alkoxy-groups; R2 means alkyl group, alkenyl group, aryl group, aralkyl group under condition that each group can comprise a substitute chosen from alkyl groups, alkoxy-groups; R3 means hydrogen atom, aryl group, aralkyl group under condition that each group can comprise a substitute chosen from alkyl groups, alkoxy-groups, halogen atoms; and two radical R can be combined to form alkylene group. Also, invention relates to a method for extraction of rare-earth metal ions and to a method for reverse extraction of rare-earth metal ions. Invention provides preparing novel phosphoneamide compounds and method for extraction and reverse extraction of rare-earth metal ions.
EFFECT: improved preparing method, valuable properties of compounds.
3 cl, 4 tbl, 44 ex
SUBSTANCE: method for rhenium isolation implies passing rhenium-containg solution through strongly-basic anion-exchange resin and elution of adsorbed rhenium with high-concentration aqueous solution of hydrochloric acid. Anion-exchange resin is treated with an oxidising aqueous solution, where hydrogen peroxide is used as an oxidiser.
EFFECT: increase in ion exchanger service life.
10 cl, 7 ex
SUBSTANCE: present invention rests on capability of metal ions to be extracted in stratified system of water, ammonium chloride, polyethyleneglycol ethers of synthetic fatty acid monoethanolamides (sintamide-5) of the general formula CnH2n+1CONH(CH2CH2O)mH (n=10-16; m=5-6) at the following component ratio, in mass %: ammonium chloride - 2-25; sintamide-5 - 5-45; water - up to 100.
EFFECT: quantitative extraction of thallium and gallium ions from water solutions without use of highly inflammable and toxic substances.
1 tbl, 2 dwg, 2 ex
SUBSTANCE: invention concerns manufacturing of radionuclides for industry, science, nuclear medicine, especially radioimmunotherapy. Particularly it concerns method of receiving actinium -227 and thorium -228 from treated by neutrons in reactor radium-226. Method includes irradiation of target containing of metallic capsule in which there is located reaction vessel, containing radium-226 in the form of compound. Then it is implemented unsealing of target's metallic capsule, dissolving of received radium. From solution it is separated by means of precipitation, and then it is implemented regeneration, preparation to new irradiation and extraction of actinium-227 and thorium-228 from solution. At that irradiation, dissolving, radium separation, its regeneration and preparation to new irradiation are implemented in the form of its united chemical form - radium bromide, in the same reaction vessel made of platinum. Method provides reusing of the same platinum vessel for receiving of actinium-227 and thorium-228 from one portion of radium by recycling of irradiation and extraction in the same vessel. Separation of metallic capsule by means of dissolving provides saving of mechanical integrity of platinum reaction vessel for each new irradiation cycle and extraction.
EFFECT: increasing of radiationally-environmental safety of process, excluding operations of increased radiation hazard.
2 cl, 2 ex