Method for refining nickel sulfate under normal pressure and the nickel extractant used therein

Abstract

A method for refining nickel sulfate under normal pressure includes: adding sulfuric acid solution to high-grade nickel matte powder to form an acid leaching solution; adding a nickel extractant in portions to form an acid leaching extraction solution, wherein the volume ratio of the nickel extractant to the sulfuric acid solution is approximately 1:1 to 5:1, and the nickel extractant comprises an etchant, pure water, and an auxiliary agent, wherein the etchant accounts for at least 40 wt% of the nickel extractant, the pure water accounts for 50 to 60 wt% of the nickel extractant, and the auxiliary agent is selected from the group consisting of surfactants, organic salts, and inorganic salts, accounting for 0.1 to 10 wt% of the nickel extractant; maintaining the acid leaching extraction reaction for 3 to 10 hours; and filtering out solid residues in the acid leaching extraction solution. A method for refining nickel sulfate under normal pressure includes: adding sulfuric acid solution to high matte nickel powder to form an acid leaching solution; adding a nickel extractant in stages to form an acid leaching extraction solution, wherein the volume ratio of the nickel extractant to the sulfuric acid solution is about 1:1 to 2.5:1, and the nickel extractant contains acid etching agent, pure water and auxiliary agent, acid etching agent accounts for at least 40wt% of the nickel extractant, pure water accounts for 50 to 60wt% of the nickel extractant, and the auxiliary agent is selected from a group consisting of surfactant, organic salts and inorganic salts, accounts for 0.1 to 10wt% of the nickel extractant; maintaining the acid leach extraction reaction for 3 to 10 hours; and filtering out the solid residues in the acid leach extraction solution.

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