Method of leaching copper, cobalt and nickel from smelting alloy

Abstract

A method of leaching copper, cobalt and nickel from smelting alloy comprises the following steps: the smelting alloy containing at least two of copper, cobalt and nickel and iron impurities is molten, and then the molten smelting alloy is atomized into alloy powder by high-pressure gas or high-pressure water; the atomized alloy powder is added into a stir aeration reaction device, a sulfuric acid solution is used as a leaching medium in the stir aeration reaction device, air or oxygen is uniformly brought from a stirring shaft system of the stir aeration reaction device, the brought gas is uniformly dispersed under the shear action of stirring blades in high-speed rotation at the bottom of the stirring shaft system, and under the effects of an oxidizing agent and a catalyst, the alloy powder is subjected to corrosion oxidizing leaching reaction in the stir aeration reaction device; after reaction is completed, most iron impurities enter a leaching residue, and solid-liquid separation is finally carried out to collect and obtain a leaching liquid containing at least two of copper, cobalt and nickel. The method of leaching copper, cobalt and nickel from the smelting alloy has the advantages that the process cost is low; the technology is convenient to control; the production is stable and reliable; the environment pollution is low and the like.

Description

technical field [0001] The invention relates to the technical fields of hydrometallurgy and chemical production, in particular to a method for separating copper, cobalt, nickel and iron in smelted alloys. Background technique [0002] Waste lithium-ion battery smelting alloy is obtained by high-temperature reduction smelting of waste lithium-ion batteries. The alloy raw material is an iron alloy containing copper, cobalt and nickel, containing 10%-40% of cobalt, 10-50% of copper, and 10%-50% of nickel. 0.1% to 5%, the iron content is 10% to 80%, and the manganese content is 0.1% to 5%. [0003] At present, the methods for leaching valuable metals from copper-cobalt-nickel alloy mainly include: [0004] 1. High-temperature and high-pressure leaching method: use sulfuric acid or hydrochloric acid to leach cobalt, copper, and nickel in the cobalt-copper alloy into the solution through high-pressure leaching or combined normal pressure leaching. This method has complicated equ...

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Problems solved by technology

[0006] 3. The leaching method with sulfuric acid and sodium chlorate is a fast and easy-to-implement method, but the price of sodium chlorate is high and the production cost is high

[0009] The above-mentioned methods are difficult to process such high-temperature smelting alloys with complex components and stable structures, and generally have disadvantages such as low leaching of copper, cobalt and nickel, long process flow, and high production costs.

In addition, at the same time as the copper, cobalt and nickel in the alloy are leached, a large amount of iron is leached into the leach solution, which brings difficulties to the subsequent iron removal, increases the burden of subsequent iron removal operations, and leads to the loss of cobalt and copper, affecting the recovery of cobalt, copper and nickel Rate

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