Chlorination leaching method of laterite sulfurized precipitate

Abstract

The invention relates to a chlorination leaching method of laterite sulfurized precipitate. Chlorination leaching is utilized to obtain the metallic-nickel-enriched turnover liquid which can directly enter the nickel production system. The technological process comprises the following steps: (1) mixing the laterite sulfurized precipitate and water in a mass ratio of (2-6):1, and introducing chlorine gas of which the pressure is 0.1-0.5Mpa; and (2) control of leaching of chlorine gas: the liquid-to-solid ratio is controlled at (2-6):1, the leaching temperature is 70-80 DEG C, the leaching potential is 450-480mv, the leaching time is 2-4 hours, and the leaching stock solution is a copper-bearing 30-50 g / L water solution. The invention obtains a nickel-cobalt sulphate solution of which the nickel content is greater than 90%: more than 90% of nickel and cobalt in the laterite sulfurized precipitate are leached and enter the solution, and valuable metals in the residues are comprehensively recycled, thereby promoting the recycling of waste ores.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for chlorination and leaching of laterite sulfide precipitates. Background technique [0002] Outsourced laterite ore sulfide sediment, dark gray, particle size below 1mm, specific gravity about 1.2~1.3t / m 3 , the water content is 40%~50%; the valuable metals Ni, Cu, and Co in the material mainly exist in the form of sulfide, and contain many types of impurities, and their physical and chemical properties are complex. See Table 1 and Table 2 for details. Conventional methods such as acid leaching, roasting-acid leaching and other methods have the problems of low direct metal recovery, high processing cost and poor operating environment. [0003] sample name Ni co Cu Fe Zn Mg CaO S raw material 1 23.62 0.47 0.15 14.85 0.078 3.90 0.043 31.06 raw material 2 19.38 0.48 0.5 13.9 0.094 2.98 0.043 30.78 average 21.5 0...

AI Technical Summary

Problems solved by technology

Conventional methods such as acid leaching, roasting-acid leaching and other methods have the problems of low direct metal recovery, high processing cost and poor operating environment.

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