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 minutes

The 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.

Claims

The 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

 

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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.

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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.

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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.

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9 cl, 1 dwg, 1 tbl, 3 ex

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6 cl, 6 ex

FIELD: metallurgy; hydrochemical methods of a complex processing of a multicomponent, polymetallic scrap.

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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.

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1 tbl, 2 dwg, 2 ex

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EFFECT: increasing of radiationally-environmental safety of process, excluding operations of increased radiation hazard.

2 cl, 2 ex

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