SU1650591A1 - Method for recovering copper - Google Patents

Abstract

This invention relates to an extraction process for the recovery of copper from ammonia solutions and allows for the selective separation of copper from solutions with a pH of 5.0-8.4. An aqueous solution containing copper, cobalt, nickel, kerosene solution containing naphthenic acid and bis-2-hydroxy is added -5-alkyl / Cs CG / benzylamine After separation of the phases, they are separated

Description

The invention relates to methods for the extraction of copper from ammonia solutions and can be used in nonferrous hydrometallurgy for the extraction of copper and its separation from cobalt and nickel.

The purpose of the invention is the selective extraction of only copper in the alkalinity range of pH 5.0-9.4.

Example 1. K25ml of an aqueous solution containing, g / l: Cu 1, Co 1, Ni 1, (NH-ite S04 2.6 and having a pH of 5, 5 ml of a 0.1 mol / l kerosene solution of a naphthenic acid mixture are added (NC ) and bis-2-hydroxy-5-alkyl / Ca-Ce / benzylamine (CAF) with a ratio of 1: 4 and in a separating funnel contact them for 3 minutes. After separation of the phases, the organic layer is separated from the aqueous layer and in the last The content of metals is determined. Found in the raffinate, g / l: Co 1, NI 1, Cu 0.01, which is 99% recovery of copper.

PRI mme R 2. 30 ml of an aqueous solution containing g / l: Cu 1, Co 1, Ni2, (NH4) 2S04 2.6 and having a pH of 6.3. contacted in a separating funnel with 5 ml of the mixture, similar to example 1 for 3 minutes After separation of the phases in the raffinate, g / l is found: Co

1, Ni 2, Cu 0.0 which corresponds to 100% recovery to one in the organic phase

Example 3 To 30 ml of an aqueous solution containing Cu 1, Co 2, NI 1 (2.6 and having a pH of 5.65. 5 ml of the mixture are poured, as in example 1, and they are contacted for 3 min in a separating funnel. After separation of the phases in an aqueous layer found, g / l. Co, NI 1, Cu 0.0 which is 100% recovery of copper in the organic phase

PRI me R 4 A 50 ml aqueous solution having a pH of 8.4 and containing g / l. Cu 5, Co 5, Ni 5, (NH4) 2S04 2,6, in a separating funnel, are in contact with 10 ml of the mixture, similar to Example 1, for 3 minutes. After delamination, the organic layer is separated from the aqueous layer and, in the latter, the metal content is determined. In the raffinate, g / l-Co 5, NI 5, Cu 0.0 is found, which corresponds to 100% recovery of copper in the organic phase.

PRI me R 5. 30 ml of an aqueous solution containing, g / l: Cu 3, Co 3, N 5, (MnfsSm 2.6 and having a pH of 6.5, are contacted in a separating funnel with 5 ml of 0.1 mol / l of a mixture of NK and KAF with a ratio of 1-2 in a melt of 3 minutes. After separation of the phases in the refining, g / l: Co 3, NI 5, Cu 0.005 was found, which

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corresponds to 99.8% copper recovery in the organic phase,

The presented examples show that, compared with the prototype in the pH range of 5.0-8.4, this method allows selective extraction of copper into the organic phase (extraction rate of 99-100%), leaving nickel and cobalt in the aqueous phase.

Claims (1)

Claims A method for extracting copper and separating it from cobalt and nickel from ammoniacal solutions by extracting 0.1 mol / L with a solution of bis-2-hydroxy-5-alkyl / C8-Ce / benzylamine in kerosene, characterized in that selective extraction of copper in the range of pH 5.0-8.4, extraction is carried out with a mixture additionally containing 0.1 mol / l of naphthenic acid solution with a volume ratio of solutions of naphthenic acid and bis-2-hydroxy-5-alkyl / St-Ce / benzylamine, equal to 1: 2-4.