Comprehensive method for processing laterite nickel ore to produce electrolytic nickel through full wet method
A technology of lateritic nickel ore and comprehensive method, which is applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of hidden safety hazards, large amount of magnesium-containing wastewater, and difficult treatment, and achieve the effect of saving production costs
Inactive Publication Date: 2012-01-25
YUNNAN TIN GROUP HLDG
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The invention provides a comprehensive method for processing laterite nickel ore to produce electrolytic nickel through the full wet process. The invention relates to a method for leaching low-grade laterite nickel ore at atmospheric pressure through sulfuric acid, belonging to the technical field of wet-process metallurgy. The comprehensive method comprises the following steps of: grinding the laterite nickel ore, leaching the laterite nickel ore by using sulfuric acid with acidity of 150-350 g/L under the acid-ore mass ratio of 0.3-1.2:1 at atmospheric pressure, adding a neutralizing agent to adjust the pH value to 3.0 and neutralize the precipitate to remove iron, adding the neutralizing agent into the mother liquid to adjust the pH value to 6.0 and neutralize and remove aluminum and silicon, continuing adding the neutralizing agent into the filtered nickel sulfate solution to adjust the pH value to 9.0 and precipitate nickel hydroxide, redissolving, purifying and electrolyzing the intermediate product of nickel hydroxide to produce the electrolytic nickel product, adding calcium hydroxide into the nickel-precipitated magnesium sulfate solution to neutralize the precipitate, and carbonizing and separating magnesium and calcium to obtain magnesium carbonate. The invention overcomes the defects of long flow, great magniferous sewage amount and difficult treatment in the prior art, magnesium is developed into a product, the production sewage can be directly discharged or recycled, and meanwhile, part of recovered magnesium can be circularly returned to the flow as the neutralizing agent.
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