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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 filtration and decontamination is used to precipitate nickel sulfide, highly toxic hydrogen sulfide gas will be generated or used, which has a large safety hazard, and it is necessary to carry out pressurized oxygen acid leaching of nickel sulfide, Then carry out the deep purification of deferric aluminum silicon to produce electrolytic nickel

Method used

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  • Comprehensive method for processing laterite nickel ore to produce electrolytic nickel through full wet method
  • Comprehensive method for processing laterite nickel ore to produce electrolytic nickel through full wet method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[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 i...

Embodiment 2

[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 ...

Embodiment 3

[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 a...

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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.

Description

technical field [0001] The invention relates to a method for leaching low-grade laterite nickel ore under atmospheric pressure with sulfuric acid, depositing nickel hydroxide after depollution by sinking iron, and producing electrolytic nickel after refining, which belongs to the technical field of hydrometallurgy. technical background [0002] Laterite nickel ore accounts for 70% of the world's total nickel resources, but the mining level is far less than that of nickel sulfide ore. According to its main components, mineral composition and processing technology, it is mainly divided into two categories. One is ferrous nickel ore with high iron and low magnesium, and the other is magnesian nickel ore with low iron and high magnesium. Its smelting process includes fire method, wet method, and combination of fire and wet methods, mainly including high-pressure acid leaching, atmospheric pressure acid leaching (including heap leaching and stirring leaching), reduction roasting...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/44C25C1/08
CPCY02P10/20
Inventor 王炜唐瑞祥黄欣季登会陈光云杨成武
Owner YUNNAN TIN GROUP HLDG
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