Process for separating copper in nickel-cobalt-copper system by solvent extraction method

Abstract

The invention provides a process for separating copper in a nickel-cobalt-copper system by a solvent extraction method. The process comprises the following steps: by taking N902-sulfonated kerosene as an extracting agent, controlling the volume ratio of an organic phase to a water phase at (3:1) to (4:1); regulating the pH value of a material liquid to 2.0-2.5; extracting at room temperature; and after carrying out clearing and phase separation on raffinate, based on sulfuric acid as a reverse extraction acid for the copper-supported organic phase, controlling the volume ratio of the organic phase to the reverse extraction acid at (6:1)-(4:1), carrying out reverse extraction at room temperature, and eluting a reverse extraction liquid to obtain a copper sulfate solution. In the process, the N902-sulfonated kerosene is used as the extracting agent, sulfuric acid is used as a reverse extraction agent, copper is separated out of the high-concentration nickel-cobalt-copper system in a high selectivity and high reverse extraction property mode, and copper is output in a pure copper sulfate solution form, thereby avoiding the retreatment and recovery of copper slag with a chemical method, and the recovery of copper is high; and after nickel-cobalt raffinate with copper removed is subjected to sodium jarosite iron removal, P204 deep impurity removal and P507 separation of nickel-cobalt, nickel-cobalt salt products are produced, thereby achieving the purification and separation of copper in a nickel-cobalt-copper impure material and the comprehensive recovery of nickel-cobalt-copper.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal smelting, and relates to a method for extracting copper from a nickel-cobalt-copper system, in particular to a process for separating copper in the nickel-cobalt-copper system by a solvent extraction method. Background technique [0002] In the field of metallurgy and chemical industry, complex acidic systems containing cobalt, nickel, copper, iron, calcium, magnesium and other metals are often produced, which are usually called "nickel-cobalt-copper miscellaneous materials". There are two main sources of nickel-cobalt-copper miscellaneous materials: one is nickel-cobalt sulfide produced by high-pressure acid leaching and ammonium sulfide precipitation of laterite ore. After roasting, desulfurization and leaching, the solution contains cobalt, nickel, copper , iron, calcium, magnesium and other metals; the other is copper-containing, manganese-containing, zinc-containing cobalt carbonate...

AI Technical Summary

Problems solved by technology

At present, the sulfidation precipitation method (sulfur dioxide + sulfur powder) is mainly used to remove copper in the acidic system of nickel-cobalt-copper miscellaneous materials: copper is removed as copper sulfide precipitation, and a certain amount of nickel-cobalt is carried in the copper sulfide slag, and nickel-cobalt and copper need to be further processed. Separation and recovery, high production cost, low direct recovery rate, and copper cannot be directly recovered into high value-added products