Wet treatment process for laterite-nickel ore

Abstract

Provided in the present disclosure is a wet treatment process for nickel laterite ore. The wet treatment process comprises: step S1, subjecting nickel laterite ore to an acid leaching treatment with an inorganic acid, so as to obtain a leached ore slurry; step S2, sequentially performing liquid-solid separation and counter-current washing on the leached ore slurry, so as to obtain a washed slurry and a leaching residue; step S3, adding a first oxidant and a first neutralizer to the washed slurry for an iron-aluminum removal treatment, so as to obtain a solution from which iron and aluminum have been removed and an iron-aluminum residue; step S4, performing a nickel-cobalt precipitation treatment on the solution from which iron and aluminum have been removed, so as to obtain a precipitated slurry; step S5, continuously performing a thickening separation treatment on the precipitated slurry, so as to obtain an underflow and an overflow; and step S6, sequentially performing post-washing treatments on the underflow, so as to obtain a nickel-cobalt hydroxide product. The present disclosure provides a short-flow wet treatment process for nickel laterite ore, which reduces production costs and energy consumption, and also improves the recovery rate of nickel and cobalt, the overall recovery rate of scandium and the quality of the nickel-cobalt oxide product.

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