Extraction of Nickel and Cobalt from Leaching Solution of Laterite Nickel Ore

Projects that use wet smelting technology to treat laterite nickel ore generally use a high-pressure acid leaching thickener washing separation iron aluminum nickel cobalt precipitation process to prepare intermediate products of nickel cobalt hydroxide or sulfide nickel cobalt. The intermediate products are further produced using leaching purification evaporation crystallization or electrodeposition processes to produce final products such as nickel sulfate, cobalt sulfate, or electric nickel, electric cobalt, etc.

After sulfuric acid leaching, laterite nickel ore is obtained with nickel content of 0.5-5 g/L, iron content of 30-50 g/L, magnesium content of 20-50 g/L, and pH less than 2.5 in a strong acid environment. The key to leaching is the separation and purification of nickel. The traditional method is to use extraction to remove impurities in multiple steps and obtain nickel sulfate solution, which is complex, difficult to control, has low processing accuracy, and is environmentally unfriendly.

The special adsorption resin product developed by Haipu has good adsorption ability for nickel in aqueous solutions with pH=2.0-4.0, but does not adsorb ferrous and magnesium. Before using the resin to adsorb nickel, a small amount of soluble trivalent iron in the slurry needs to be reduced to ferrous. In the present invention, SO2, sodium sulfite or sodium metabisulfite are used to reduce trivalent iron.

Extraction of Nickel and Cobalt from Leaching Solution of Laterite Nickel Ore

After the above treatment, ion exchange resin can be directly added to the slurry to recover nickel and cobalt. The resin loaded with nickel and cobalt can be washed with acid to obtain a pure solution containing only nickel and cobalt.

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