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A kind of method of direct electrolysis of sulfuric acid leaching of laterite nickel ore

A laterite nickel ore and leaching technology, which is applied to the improvement of process efficiency, photography technology, instruments and other directions, can solve the problems of large amount of magnesium-containing wastewater, low recovery rate, difficult treatment, etc., and achieves reduction of acid consumption and filtration energy. The effect of consumption and quantity reduction

Inactive Publication Date: 2011-12-21
YUNNAN TIN GROUP HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] 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 the large amount of magnesium-containing wastewater, and difficult treatment. In addition, if the precipitation of nickel sulfide is used, it will The production of highly toxic hydrogen sulfide gas has great potential safety hazards, and it is necessary to carry out pressurized oxygen acid leaching of nickel sulfide, and then carry out deferrification and deep purification of aluminum and silicon before the production of electrolytic nickel

Method used

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  • A kind of method of direct electrolysis of sulfuric acid leaching of laterite nickel ore
  • A kind of method of direct electrolysis of sulfuric acid leaching of laterite nickel ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Take 200g of lateritic nickel-iron ore (containing 0.8-1.8% nickel, 15-30% iron, and magnesium <15%) and grind it to -100 mesh, and add water to prepare iron slurry with a solid content of 30%.

[0036] Take 200g of laterite nickel-magnesium ore (containing 0.8-1.8% nickel, iron <15%, 10-30% magnesium) and grind it to -100 mesh, add water to prepare magnesia slurry with a solid content of 30%.

[0037] Slowly add 120ml of sulfuric acid into the iron ore slurry, stir under normal pressure, and carry out sulfuric acid leaching of the iron ore for 4 hours.

[0038] In the leached acid leaching pulp, slowly add the prepared magnesia pulp, add 20g of sodium sulfate, stir under normal pressure, monitor the pH value until pH=3.0, stop adding magnesia pulp, continue stirring for 3 hours, and complete the precipitation of iron vanadium. Slowly add calcium hydroxide solution, monitor the pH value until pH = 6.0, complete the precipitation of aluminum and silicon afte...

Embodiment 2

[0042] Example 2: Take 200g of lateritic nickel-iron ore (containing 0.8-1.8% nickel, 15-30% iron, and magnesium <15%) and grind it to -160 mesh, and add water to prepare iron slurry with a solid content of 35%.

[0043] Take 200g of laterite nickel-magnesium ore (containing 0.8-1.8% nickel, iron <15%, 10-30% magnesium) and grind it to -100 mesh, add water to prepare magnesia slurry with a solid content of 30%.

[0044] Slowly add 110ml of sulfuric acid into the iron ore slurry, stir under normal pressure, and carry out sulfuric acid leaching of the iron ore for 4 hours.

[0045] In the leached acid leaching pulp, slowly add the prepared magnesia pulp, add 20g of sodium sulfate, stir under normal pressure, monitor the pH value until pH=3.0, stop adding magnesia pulp, continue stirring for 3 hours, and complete the precipitation of iron vanadium. Slowly add calcium hydroxide solution, monitor the pH value until pH = 6.0, complete the precipitation of aluminum and silicon aft...

Embodiment 3

[0049] Example 3: Take lateritic nickel-iron ore (containing 0.8-1.8% nickel, 15-30% iron, magnesium <15%) 200g and grind it to -200 mesh, add water to prepare iron slurry with a solid content of 40%.

[0050] Take 200g of laterite nickel-magnesium ore (containing 0.8-1.8% nickel, iron <15%, 10-30% magnesium) and grind it to -100 mesh, add water to prepare magnesia slurry with a solid content of 30%.

[0051] Slowly add 95ml of sulfuric acid into the iron ore slurry, stir under normal pressure, and carry out sulfuric acid leaching of the iron ore for 4 hours.

[0052] In the leached acid leaching pulp, slowly add the prepared magnesia pulp, add 20g of sodium sulfate, stir under normal pressure, monitor the pH value until pH=3.0, stop adding magnesia pulp, continue stirring for 3 hours, and complete the precipitation of iron vanadium. Slowly add calcium hydroxide solution, monitor the pH value until pH = 6.0, complete the precipitation of aluminum and silicon after no change...

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Abstract

A method for directly electrolyzing laterite nickel ore with sulfuric acid leaching, the invention relates to a method for leaching low-grade laterite nickel ore with sulfuric acid at normal pressure, and belongs to the technical field of hydrometallurgy. The steps of the method are: separately grinding and pulping the iron ore and magnesia ore in the laterite nickel ore, leaching the iron ore with sulfuric acid under high acidity and high acid ore ratio, adding magnesia ore slurry to adjust the pH value to precipitate jarosite Alkaline neutralizer is added to the mother liquor to remove aluminum and silicon. The filtered leachate is used to absorb nickel ions with ion exchange resin. The electrolytic nickel product is produced by electrolysis, and the magnesium sulfate-containing solution after the ion exchange resin is added with calcium hydroxide to precipitate, and the magnesium and calcium are separated by carbonization to obtain magnesium carbonate. The present invention solves the disadvantages of long process flow, large amount of magnesium-containing wastewater and difficult treatment, and makes the magnesium open to become a product, and the wastewater can be directly discharged or reused, and at the same time, part of the recovered magnesium can be returned to the process for recycling. agent.

Description

technical field [0001] The invention relates to a method for leaching low-grade laterite nickel ore under atmospheric pressure with sulfuric acid, carrying out adsorption and desorption of nickel with an ion exchange resin after iron precipitation, removal of impurities and filtration, and producing electrolytic nickel after refining, which belongs to the technical field of hydrometallurgy. Background technique [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 ...

Claims

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Application Information

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IPC IPC(8): C22B3/08C22B3/46C22B3/42C25C1/08C22B23/00
CPCY02P10/20
Inventor 雷毅王炜董建勇唐瑞祥季登会陈光云杨成武
Owner YUNNAN TIN GROUP HLDG
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