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

11 Cites 30 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0013] Generally speaking, the sulfuric acid leaching laterite nickel ore process mainly has the disadvantages of nickel leaching rate, low recovery rate, high acid consumption, especially long process flow, large amount of magnesium-containing wastewater, and difficult treatment.

In addition, if the nickel sulfate solution after filtrat...

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Abstract

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.

Application Domain

Photography auxillary processesProcess efficiency improvement

Technology Topic

Calcium hydroxideAluminium +11

Image

Examples

Experimental program(3)

Example Embodiment

[0034] Example 1: Take 200g of laterite nickel ore (containing 0.8% nickel, 15% iron, and 15% magnesium) and grind it to -100 mesh, add water to prepare a slurry with a solid content of 30%.

[0035] Slowly add 95ml of sulfuric acid into the pulp, stir under normal pressure, and carry out sulfuric acid leaching, and the leaching time is 4 hours.

[0036] Add sodium carbonate to the leached acid leaching pulp, stir at normal pressure, monitor the pH value until pH=3.0, continue stirring for 3.5 hours, and complete the precipitation of iron and vanadium. Slowly add magnesium hydroxide solution, monitor the pH value until pH = 6.0, and complete the precipitation of aluminum and silicon after no change.

[0037] Filtrate, the clear liquid is nickel sulfate and magnesium solution, slowly add magnesium hydroxide solution until pH=9.0, and complete nickel hydroxide precipitation after being stable without any change.

[0038] After nickel precipitation, calcium hydroxide solution is added to the mother liquor to neutralize the pH>10 to obtain magnesium hydroxide, part of which is returned to the process, and the rest is carbonized and pyrolyzed to separate magnesium and calcium to obtain magnesium carbonate.

[0039] Nickel hydroxide is re-dissolved in acid, purified and decontaminated, and then electrolyzed to obtain electrolytic nickel.

Example Embodiment

[0040] Example 2: Take 200g of laterite nickel ore (containing 0.8% nickel, 15% iron, and 15% magnesium) and grind it to -160 mesh, add water to prepare a slurry with a solid content of 37%.

[0041] Slowly add 88ml of sulfuric acid into the pulp, stir under normal pressure, and carry out sulfuric acid leaching, and the leaching time is 4 hours.

[0042] Add sodium carbonate to the leached acid leaching pulp, stir at normal pressure, monitor the pH value until pH=3.0, continue stirring for 3.5 hours, and complete the precipitation of iron and vanadium. Slowly add magnesium hydroxide solution, monitor the pH value until pH = 6.0, and complete the precipitation of aluminum and silicon after no change.

[0043] Filtrate, the clear liquid is nickel sulfate and magnesium solution, slowly add magnesium hydroxide solution until pH=9.0, and complete nickel hydroxide precipitation after being stable without any change.

[0044] After nickel precipitation, calcium hydroxide solution is added to the mother liquor to neutralize the pH>10 to obtain magnesium hydroxide, part of which is returned to the process, and the rest is carbonized and pyrolyzed to separate magnesium and calcium to obtain magnesium carbonate.

[0045] Nickel hydroxide is re-dissolved in acid, purified and decontaminated, and then electrolyzed to obtain electrolytic nickel.

Example Embodiment

[0046] Example 3: Take 200g of laterite nickel ore (containing 0.8% nickel, 15% iron, and 15% magnesium) and grind it to -200 mesh, add water to prepare a slurry with a solid content of 45%.

[0047] Slowly add 75ml of sulfuric acid into the pulp, stir under normal pressure, and carry out sulfuric acid leaching, and the leaching time is 4 hours.

[0048] Add sodium carbonate to the leached acid leaching pulp, stir at normal pressure, monitor the pH value until pH=3.0, continue stirring for 3 hours, and complete the precipitation of iron and vanadium. Slowly add magnesium hydroxide solution, monitor the pH value until pH = 6.0, and complete the precipitation of aluminum and silicon after no change.

[0049] Filtrate, the clear liquid is nickel sulfate and magnesium solution, slowly add magnesium hydroxide solution until pH=9.0, and complete nickel hydroxide precipitation after being stable without any change.

[0050] After nickel precipitation, calcium hydroxide solution is added to the mother liquor to neutralize the pH>10 to obtain magnesium hydroxide, part of which is returned to the process, and the rest is carbonized and pyrolyzed to separate magnesium and calcium to obtain magnesium carbonate.

[0051] Nickel hydroxide is re-dissolved in acid, purified and decontaminated, and then electrolyzed to obtain electrolytic nickel.

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