Crystallization method of nickel sulfate, cobalt sulfate and manganese sulfate

A technology of nickel sulfate and cobalt sulfate, applied in nickel sulfate, manganese sulfate, cobalt sulfate and other directions, can solve the problems of long crystallization time, inability to effectively remove impurities, and high cost, so as to improve the crystallization efficiency and avoid fine crystallization operations. Effect

Pending Publication Date: 2021-06-04
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Battery-grade nickel sulfate, cobalt sulfate, and manganese sulfate have high production requirements. In order to save energy and reduce consumption, and finely control the entire crystallization process during the evaporation crystallization process, there are high requirements for equipment and personnel operations. In order to control the impurity content, often The recrystallization process is also required, which complicates the production process and increases the production cost
[0003] It is difficult to obtain high-quality manganese sulfate from ordinary manganese sulfate materials, because various impurities cannot be effectively removed, and the crystallization recovery rate is low. At present, the following methods are mainly used in the preparation process of high-purity manganese sulfate: a. High temperature crystallization production Nickel sulfate, cobalt, and manganese; b. Production of high-purity nickel sulfate, cobalt, and manganese through multiple recrystallizations; c. Production of nickel sulfat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1

[0035] This embodiment provides a crystallization method of nickel sulfate, the method comprising the steps of:

[0036] (1) The 200 g / L nickel sulfate solution is first warmed to 40 ° C, then 300 g / l of sodium sulfate powder is added thereto, and a seed crystal of 3% of the total amount of nickel sulfate is added (the crystal comprises sodium sulfate and the site. Nickel sulfate powder containing, and additionally adds 2% sulfate crystals of nickel sulfate solution in the nickel sulfate solution, control the sodium sulfate powder of the added sodium sulfate is 2 h, continuously stirring crystallization 2H;

[0037] (2) The crystal slurry was centrifuged, and the moisture <10 wt% was controlled, and 0.5 times the volume of 200 g / L sulfate solution was added to the crystallization, then continued to maintain the centrifugation speed of 10 min. Filter residue drying collects nickel sulfate sulfate;

[0038] (3) The mother liquor after nickel sulfate crystals...

Example Embodiment

[0040] Example 2

[0041] This embodiment provides a crystallization method of cobalt sulfate, the method comprising the steps of:

[0042] (1) The 350 g / l sulfate solution is first warmed to 45 ° C, then 300 g / l of sodium sulfate powder is added thereto, and the total amount of sulfate amount of 4% sulfate is added (the crystal comprises sodium sulfate and the above). The cobalt sulfate powder containing, and additionally added 2% sulfate crystals of cobalt sulfate in the cobalt sulfate solution), and the sodium sulfate powder of the addition of the sulfate powder is 3 h, and the crystallization is continuously stirred;

[0043] (2) Centrifugation of the crystallized slurry was centrifuged, and the moisture <10 wt% was controlled to complete the dehydration, 0.5 volumes of 350 g / L sulfate solution was centrifuged to wash the crystallization, then continued to maintain the centrifugation speed 10 min. Filter residue drying collects cobalt sulfate

[0044] (3) The mother liqu...

Example Embodiment

[0046] Example 3

[0047] This embodiment provides a crystallization method of manganese sulfate, the method comprising the steps of:

[0048] (1) The 520 g / L sulfate solution is first warmed to 35 ° C and then 300 g / l of sodium sulfate powder is added thereto, and a seed crystal of 5% of manganese sulfate is added (the crystal comprises sodium sulfate and where the crystal is added therein. The manganese sulfate containing sulphic acid, and additionally adds the total amount of manganese sulfate in the sulfate solution of sulfate.

[0049] (2) The crystal slurry was centrifuged, and the moisture <10 wt% was controlled, and the crystal was washed with 0.5-fold volume of 350 g / L sulfate sulfate after dehydration, and then the centrifugation was 10 min. Filter residue drying collects manganese sulfate;

[0050] (3) The mother liquor after manganese sulfate crystals is lowered to 25 ° C by heat exchange, and then the cooling is lowered to 10 ° C by means of the equipment, and t...

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PUM

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Abstract

The invention provides a crystallization method of nickel sulfate, cobalt sulfate and manganese sulfate, which comprises the following steps: (1) heating a nickel sulfate solution, a cobalt sulfate solution or a manganese sulfate solution, and adding sodium sulfate and seed crystal for crystallization to obtain crystallized slurry; and (2) carrying out centrifugal dewatering treatment on the crystallized slurry obtained in the step (1) to obtain filter residues and mother liquor, washing and drying the filter residues to obtain a finished product, and carrying out sodium sulfate crystallization treatment on the mother liquor to obtain sodium sulfate. According to the process, sodium sulfate is adopted as a crystallization additive, crystallization of nickel sulfate, cobalt sulfate and manganese sulfate can be achieved under the medium-low temperature condition, introduction of high-temperature crystallization equipment and fine crystallization operation are avoided, and the additive is low in cost, safe and stable.

Description

technical field [0001] The invention belongs to the technical field of crystallization and relates to a crystallization method of nickel sulfate, cobalt and manganese. Background technique [0002] Nickel sulfate, cobalt sulfate, and manganese sulfate have always been the main raw materials for the synthesis of ternary precursor materials in the field of new energy batteries, and have been widely used in medicine, printing and dyeing, electroplating and other inorganic chemical industries. Battery-grade nickel sulfate, cobalt sulfate, and manganese sulfate have high production requirements. In order to save energy and reduce consumption, and finely control the entire crystallization process during the evaporation crystallization process, there are high requirements for equipment and personnel operations. In order to control the impurity content, often A recrystallization process is also required, which complicates the production process and increases the production cost. ...

Claims

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Application Information

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IPC IPC(8): C01G53/10C01G51/10C01G45/10
CPCC01G45/10C01G51/10C01G53/10C01P2006/80
Inventor 万江涛张宁张勇杰刘满库李子郯
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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