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Nickel-cobalt precipitation method for hydrometallurgy of lateritic nickel ore

A technology of lateritic nickel ore and hydrometallurgy, which is applied in the field of hydrometallurgy and can solve the problems of high water content, high cost and poor precipitation effect of the filter cake

Active Publication Date: 2017-11-28
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for precipitating nickel and cobalt in laterite nickel ore hydrometallurgy to solve the problems of high cost and poor precipitation effect in the prior art when nickel and cobalt are deposited in laterite nickel ore hydrometallurgy And the problem of high water content in the filter cake

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1, use sulfuric acid laterite nickel ore to carry out acid leaching to obtain nickel-cobalt acid leaching solution, and use limestone to remove iron and aluminum; in the nickel-cobalt acid leaching solution after iron and aluminum removal, nickel-cobalt acid leaching solution contains 3.5g / L of nickel and cobalt 0.3g / L;

[0033] Step 2: Precipitate the nickel-cobalt-containing acid immersion solution, and continuously add fresh nickel-cobalt-containing acid immersion solution and precipitant during the precipitation reaction to obtain a nickel-cobalt precipitation solution; the precipitation temperature in this process is 65°C, Settling time is 2h;

[0034] Step 3, densely separating the nickel-cobalt precipitation solution to obtain a nickel-cobalt underflow with a solid content of 16%; and dividing the nickel-cobalt underflow into a first part and a second part;

[0035] Step 4, mixing the first part of the nickel-cobalt bottom flow with milk of lime to form a m...

Embodiment 2

[0038] Step 1, use sulfuric acid laterite nickel ore to carry out acid leaching to obtain nickel-cobalt acid leaching solution, and use limestone to remove iron and aluminum; in the nickel-cobalt acid leaching solution after iron and aluminum removal, nickel-cobalt acid leaching solution contains 3.5g / L of nickel and cobalt 0.3g / L;

[0039] Step 2: Precipitate the nickel-cobalt-containing acid immersion solution, and continuously add fresh nickel-cobalt-containing acid immersion solution and precipitant during the precipitation reaction to obtain a nickel-cobalt precipitation solution; the precipitation temperature in this process is 65°C, Settling time is 2h;

[0040] Step 3: Thickly separate the nickel-cobalt precipitation solution to obtain a nickel-cobalt underflow with a solid content of 12%; and divide the nickel-cobalt underflow into a first part and a second part;

[0041] Step 4, mixing the first part of the nickel-cobalt bottom flow with milk of lime to form a mixed...

Embodiment 3

[0044] Step 1, use sulfuric acid laterite nickel ore to carry out acid leaching to obtain nickel-cobalt acid leaching solution, and use limestone to remove iron and aluminum; in the nickel-cobalt acid leaching solution after iron and aluminum removal, nickel-cobalt acid leaching solution contains 3.5g / L of nickel and cobalt 0.3g / L;

[0045] Step 2: Precipitate the nickel-cobalt-containing acid immersion solution, and continuously add fresh nickel-cobalt-containing acid immersion solution and precipitant during the precipitation reaction to obtain a nickel-cobalt precipitation solution; the precipitation temperature in this process is 65°C, Settling time is 2h;

[0046] Step 3, densely separating the nickel-cobalt precipitation solution to obtain a nickel-cobalt underflow with a solid content of 8%; and dividing the nickel-cobalt underflow into a first part and a second part;

[0047] Step 4, mixing the first part of the nickel-cobalt bottom flow with milk of lime to form a mi...

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PUM

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Abstract

The invention provides a nickel-cobalt precipitation method for hydrometallurgy of lateritic nickel ore. The method comprises the following steps: step 1, the lateritic nickel ore is subjected to acid leaching, and a nickel-cobalt-containing acid leachate is obtained and contains magnesium ions; step 2, the nickel-cobalt-containing acid leachate is subjected to a precipitation reaction, fresh nickel-cobalt-containing acid leachate and a precipitant are added continuously in the precipitation reaction process, and a nickel-cobalt precipitate is obtained; step 3, the nickel-cobalt precipitate is subjected to thickness separation, and nickel-cobalt precipitate underflow is obtained; the nickel-cobalt precipitate underflow is divided into a first part and a second part; step 4, the first part of the nickel-cobalt precipitate underflow is mixed with lime milk, and mixed ore pulp is formed and returned to the step 2 to serve as at least part of the precipitant; the second part of the nickel-cobalt precipitate underflow is subjected to calcium-nickel separation, and nickel cobalt hydroxide is obtained. According to the method, the precipitation performance of nickel cobalt hydroxide is better, thickness separation speed and thick underflow solid content can be increased, and the water content of the nickel cobalt hydroxide product is reduced.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for precipitating nickel and cobalt in laterite nickel ore hydrometallurgy. Background technique [0002] At present, the precipitation of nickel and cobalt in laterite nickel ore hydrometallurgy usually includes the following steps: first acid leaching the laterite nickel ore; then using sodium hydroxide as a precipitant to precipitate nickel and cobalt in the acid leaching solution to form nickel cobalt Precipitation liquid; carry out dense treatment to nickel-cobalt precipitation liquid again, obtain nickel hydroxide cobalt precipitation (nickel hydroxide and cobalt hydroxide). [0003] However, when sodium hydroxide is used as a precipitant, on the one hand, the cost is relatively high; In the dense separation process, the separation speed is slow, and the concentration of the dense underflow is low, which is not conducive to the later separation. In additi...

Claims

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Application Information

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IPC IPC(8): C22B23/00
CPCC22B23/0469
Inventor 孙宁磊彭建华刘国
Owner CHINA ENFI ENGINEERING CORPORATION
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