Method for preparing battery-grade nickel sulfate by deeply removing sodium from refined nickel salt

A nickel sulfate, battery-grade technology, applied in the direction of nickel sulfate, etc., can solve problems such as difficult to control thoroughly, poor environment for extractant use, limited nickel extraction, etc.

Pending Publication Date: 2021-01-29
YANGGU XIANGGUANG COPPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods of nickel salt purification mainly include general chemical precipitation method, extraction method, etc. These methods have obvious effects on the removal of heavy metal salts, but sodium salts will be introduced during the operation process, and there is currently no good method for the removal of sodium. approach, leading to frequent occurrence of excessive sodium in products
[0003] Patent CN100389520 C mentions the use of rare earth elements to remove sodium in nickel sulfate solution, but rare earth elements are rare and expensive
There are also patent documents mentioning the method of using sodium carbonate to precipitate nickel to obtain nickel carbonate to remove sodium, but the introduction of sodium into the system results in a huge amount of washing water, which is difficult to control completely, and the nickel precipitation is not thorough, and the nickel recovery rate is low
There is also the use of extraction and sodium soap back extraction process to remove sodium. First, the use environment of the extractant is poor, and secondly, the extraction amount of nickel is limited, the process is long, the control is cumbersome, and the loss of nickel in the raffinate is relatively large.

Method used

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  • Method for preparing battery-grade nickel sulfate by deeply removing sodium from refined nickel salt
  • Method for preparing battery-grade nickel sulfate by deeply removing sodium from refined nickel salt
  • Method for preparing battery-grade nickel sulfate by deeply removing sodium from refined nickel salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] S1. Take 150kg of refined nickel sulfate, add 250L, and dissolve at 50°C to obtain a high-sodium nickel salt solution.

[0101] S2. Add 146L of ammonium sulfate solution with a concentration of 600g / L to the high-sodium nickel salt solution, stir for 10 minutes, put it in a refrigerator, and keep the temperature at -14°C for freezing and crystallization until Ni in the freezing solution<1g / L end at L. Afterwards, filter, obtain nickel ammonium sulfate crystal 243kg and nickel ammonium sulfate crystallization mother liquor.

[0102] S3. Perform A treatment on the obtained nickel ammonium sulfate crystals, and perform B treatment on the obtained crystallization mother liquor.

[0103] A treatment:

[0104] A1. Use saturated ammonium sulfate solution to wash nickel ammonium sulfate crystals three times, each time with 50L of washing liquid, and the temperature of the washing liquid is 3°C. After washing, 240 kg of refined ammonium nickel sulfate crystals were obtained, an...

Embodiment 2

[0122] S1. Take 154kg of refined nickel sulfate, add 250L, and dissolve at 65°C to obtain a high-sodium nickel salt solution.

[0123] S2. Add 160L of ammonium sulfate solution with a concentration of 600g / L to the high-sodium nickel salt solution, stir for 10 minutes, put it into a refrigerator, and keep the temperature at -10°C for freezing and crystallization until Ni in the freezing solution<1g / L end at L. Afterwards, filter, obtain nickel ammonium sulfate crystal 244kg and nickel ammonium sulfate crystallization mother liquor.

[0124] S3. Perform A treatment on the obtained nickel ammonium sulfate crystals, and perform B treatment on the obtained crystallization mother liquor.

[0125] A treatment:

[0126] A1. Use saturated ammonium sulfate solution to wash nickel ammonium sulfate crystals three times, each time with 50L of washing liquid, and the temperature of the washing liquid is 3°C. After washing, 242 kg of refined ammonium nickel sulfate crystals were obtained...

Embodiment 3

[0142] S1. Take 144kg of refined nickel sulfate, add 320L, and dissolve at 80°C to obtain a high-sodium nickel salt solution.

[0143] S2. Add 144L of ammonium sulfate solution with a concentration of 600g / L to the high-sodium nickel salt solution, stir for 10 minutes, put it in a refrigerator, and keep the temperature at -13°C for freezing and crystallization until Ni in the freezing solution<1g / L end at L. Afterwards, it was filtered to obtain 227.0 kg of ammonium nickel sulfate crystals and ammonium nickel sulfate crystal mother liquor.

[0144] S3. Perform A treatment on the obtained nickel ammonium sulfate crystals, and perform B treatment on the obtained crystallization mother liquor.

[0145] A treatment:

[0146] A1. The nickel ammonium sulfate crystals were washed three times with saturated ammonium sulfate solution, each time with 50 L of washing liquid, and the temperature of the washing liquid was 4°C. After washing, 226.5 kg of refined nickel ammonium sulfate c...

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Abstract

The invention provides a method for preparing battery-grade nickel sulfate by deeply removing sodium from refined nickel salt, which comprises the following steps: dissolving refined sodium-containingnickel salt, adding an ammonium sulfate solution, and carrying out freezing crystallization to obtain ammonium nickel sulfate crystals and a crystallization mother solution; respectively carrying outdifferent treatments on ammonium nickel sulfate crystals, washing the ammonium nickel sulfate crystals by using an ammonium sulfate solution, calcining and decomposing to form nickel sulfate, mixingand dissolving the nickel sulfate, water and an acid solution, and carrying out freeze drying to obtain the battery-grade nickel sulfate. According to the method, sodium can be effectively removed from the nickel salt, the recovery rate of nickel is high, and the obtained product is battery-grade nickel sulfate.

Description

technical field [0001] The invention relates to the field of nonferrous metallurgy, in particular to a method for preparing battery-grade nickel sulfate through deep sodium removal of refined nickel salt. Background technique [0002] Nickel salts are widely used in electronics, chemical industry, especially battery industry. At present, the methods of nickel salt purification mainly include general chemical precipitation method, extraction method, etc. These methods have obvious effects on the removal of heavy metal salts, but sodium salts will be introduced during the operation process, and there is currently no good method for the removal of sodium. method, leading to excessive sodium in products. [0003] Patent CN100389520 C mentions the use of rare earth elements to remove sodium in nickel sulfate solution, but rare earth elements are rare and expensive. There are also patent documents mentioning the method of using sodium carbonate to precipitate nickel to obtain ni...

Claims

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Application Information

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IPC IPC(8): C01G53/10
CPCC01G53/10C01P2006/80
Inventor 谢祥添张勇汪为慧
Owner YANGGU XIANGGUANG COPPER
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