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Method for producing nickel-cobalt hydroxide by hydrometallurgy of laterite nickel ore

A technology of nickel-cobalt hydroxide and laterite nickel ore is applied in the direction of improving process efficiency, which can solve the problems of high operating cost, poor settling energy, unfavorable post-separation, etc., and achieves lower production cost, easy separation and compact overall process. reasonable effect

Active Publication Date: 2020-07-14
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, if a section of iron and aluminum removal is placed after the CCD, it is necessary to build a filter press workshop to process the iron and aluminum slag separately, which requires high investment and high operating costs in the later stage; when sodium hydroxide is used as the precipitant, on the one hand, the cost is high, and on the other hand, due to Its alkalinity is strong, and it is easy to form local over-alkali when adding materials in the actual industrial operation process, resulting in small sedimentation particle size and poor settling energy, which makes the separation speed slower in the dense separation process, and the concentration of dense underflow is lower, which is not conducive to later separation
In addition, using sodium hydroxide as a precipitant, the obtained nickel hydroxide filter cake has a high water content, which is not conducive to subsequent treatment

Method used

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  • Method for producing nickel-cobalt hydroxide by hydrometallurgy of laterite nickel ore
  • Method for producing nickel-cobalt hydroxide by hydrometallurgy of laterite nickel ore

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Limonite-type lateritic nickel ore, with a nickel content of 1.4wt.%, an acid ore ratio of 350kg / t ore, and a leaching temperature of 240°C. After the leaching slurry is dissolved and returned to the mixture of the second-stage nickel-cobalt precipitation dense underflow slurry, the deep impurity-removing precipitation dense slurry, and the mixture of the gypsum slurry after the first-stage precipitation nickel-cobalt separation, add 20% concentration of magnesium oxide slurry and add 5kg / m 3 Sodium sulphate for pulp, to pH = 1.8. Continue to add magnesia pulp, feed compressed air, and adjust the pH value to 3.8, then enter the 6-stage CCD washing, the washing water is 2 times, the underflow is neutralized with lime milk, the overflow is added to the magnesia pulp, and the compressed air is fed to adjust the pH Dense after the value reaches 5.0. The underflow returns to leaching, and the overflow is used to precipitate nickel and cobalt. The precipitation uses 20% lime...

Embodiment 2

[0034] The limonite-type lateritic nickel ore and the residual ore-type lateritic nickel ore with a mass ratio of 4:1 have a nickel content of 1.6wt.%, an acid ore ratio of 480kg / t ore, and a leaching temperature of 240°C. After the leaching slurry is dissolved and returned to the mixture of the second-stage nickel-cobalt precipitation dense underflow slurry, the deep impurity-removing precipitation dense slurry, and the mixture of the gypsum slurry after the first-stage precipitation nickel-cobalt separation, add 20% concentration of magnesium oxide slurry and add 5kg / m 3 Sodium sulphate for pulp, to pH = 1.8. Continue to add magnesia pulp, feed compressed air, and adjust the pH value to 3.8, then enter the 6-stage CCD washing, the washing water is 2 times, the underflow is neutralized with lime milk, the overflow is added to the magnesia pulp, and the compressed air is fed to adjust the pH Dense after the value reaches 5.0. The underflow returns to leaching, and the overflo...

Embodiment 3

[0038] Limonite-type lateritic nickel ore, with a nickel content of 1.4wt.%, an acid ore ratio of 350kg / t ore, and a leaching temperature of 240°C. After the leaching slurry is dissolved and returned to the mixture of the second-stage nickel-cobalt precipitation dense underflow slurry, the deep impurity-removing precipitation dense slurry, and the mixture of the gypsum slurry after the first-stage precipitation nickel-cobalt separation, add 20% concentration of magnesium oxide slurry and add 5kg / m 3 Sodium sulphate for pulp, to pH = 1.8. Continue to add magnesia pulp, pass in compressed air, adjust the pH value to 3.8, then enter the 6-stage CCD washing, the washing water is 2 times, neutralize the underflow with lime milk, add magnesia pulp to the overflow, and pass in compressed air to adjust the pH Dense after the value reaches 5.0. The underflow returns to leaching, and the overflow is used to precipitate nickel and cobalt. The precipitation uses 20% lime milk, CaO / Ni=1.9...

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Abstract

METHOD OF NICKEL-COBALT HYDROXIDE HYDROMETALLURGICAL EXTRACTION FROM LATERITE-NICKEL ORE The disclosure provides a method of nickel-cobalt hydroxide hydrometallurgical extraction from a laterite-nickel ore. The method includes steps of: subjecting the laterite-nickel ore to leaching under high pressure or normal pressure, pre-neutralizing the leachate slurry, removing iron and aluminum, CCD washing, deeply removing impurity, and precipitating nickel-cobalt with lime cream, and separating the mixture of gypsum and nickel-cobalt hydroxide produced by the precipitation reaction by the solid-solid separation device to obtain the nickel-cobalt hydroxide and subjecting the gypsum containing a small amount of nickel-cobalt to returning to the leaching process to recycle nickel-cobalt. (FIG. 1) laterite-nickel are F leaching pre-neutralzing removing iron and aluminum part of overflow CCD washing underflow [deeply removing unpurity underflo-w underflow first nikel-cobalt precipitation underflow second niekel-cobalt precipitation Lime separation part of overflowera Nickel-cobalt hydroxide enu neutralizing with trailings underflow discharRed Fig. 2

Description

technical field [0001] The field of the invention belongs to the field of nickel-cobalt hydrometallurgy, and in particular relates to a method for producing nickel-cobalt hydroxide by hydrometallurgy of laterite nickel ore. Background technique [0002] At present, the precipitation of nickel and cobalt in the hydrometallurgy of laterite nickel ore usually includes the following steps: first, acid leaching the laterite nickel ore; then pre-neutralization—CCD washing—one stage of iron and aluminum removal—deep impurity removal; finally, hydrogen oxidation Sodium is used as a precipitant to precipitate nickel and cobalt in the acid leaching solution to form a nickel-cobalt precipitation solution; then the nickel-cobalt precipitation solution is densely treated to obtain nickel-cobalt hydroxide precipitation (nickel hydroxide and cobalt hydroxide). [0003] However, if a section of iron and aluminum removal is placed after the CCD, it is necessary to build a filter press worksh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/04C22B3/44C22B3/22C22B23/00
CPCC22B3/04C22B3/22C22B3/44C22B23/0415C22B23/0461Y02P10/20
Inventor 孙宁磊刘苏宁李勇丁剑秦丽娟曹敏
Owner CHINA ENFI ENGINEERING CORPORATION
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