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A kind of preparation method of large particle nickel sulfate crystal

A technology of nickel sulfate and large particles, applied in the direction of nickel sulfate, etc., can solve the problems of low product purity and content, extensive variable control, small particle size, etc., and achieve the effect of low impurity content in the finished product

Active Publication Date: 2022-07-15
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the production of nickel sulfate in my country usually adopts the method of concentrated crystallization, and the crystallization process is controlled by adjusting the pH value and adding seeds, but the degree of supersaturation in the crystallization process is still too large, and the variable control of nickel sulfate crystallization process in my country is relatively extensive. The crystal form of the product is poor, the appearance is powdery, dull, the particle size is small, and it is easy to form agglomerates; on the one hand, it causes difficulty in filtration, and the single-pass yield is low; on the other hand, the purity and content of the product are low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The embodiment of the present invention 1 provides a kind of preparation method of large particle nickel sulfate crystal, and its method is implemented by the following steps:

[0025] Step 1, add nickel sulfate solution in the concentration kettle, wherein, the nickel content in the nickel sulfate solution is not less than 80g / L, then carry out heating concentration with the heating rate of 0.5 ℃ / min, in the process of heating concentration, stir with 5Hz. The frequency is continuously stirred until the concentration of the nickel sulfate solution reaches 55 Baume degrees to obtain the first solution;

[0026] Step 2, transfer the first solution obtained in step 1 into the crystallization kettle for cooling crystallization, and cool at a cooling rate of 20°C / h until the cooling temperature drops to 60°C, use a 50-mesh sieve to crystallize the nickel sulfate seeds. Treatment, adding the treated nickel sulfate crystal seed to the first solution, the ratio of adding the n...

Embodiment 2

[0029] The embodiment of the present invention 2 provides a kind of preparation method of large particle nickel sulfate crystal, and its method is implemented by the following steps:

[0030] Step 1, in the concentration kettle, add nickel sulfate solution, wherein, the nickel content in the nickel sulfate solution is not less than 80g / L, then carry out heating concentration with the heating rate of 1 ℃ / min, in the process of heating concentration, stir with 5Hz. The frequency is continuously stirred until the concentration of the nickel sulfate solution reaches 60 Baume degrees to obtain the first solution;

[0031] Step 2, transfer the first solution obtained in step 1 into the crystallization kettle for cooling crystallization, and cool at a cooling rate of 20°C / h until the cooling temperature drops to 60°C, use a 50-mesh sieve to crystallize the nickel sulfate seeds. Treatment, adding the treated nickel sulfate crystal seed to the first solution, the ratio of adding the ni...

Embodiment 3

[0034] The embodiment of the present invention 3 provides a kind of preparation method of large particle nickel sulfate crystal, and its method is implemented by the following steps:

[0035] Step 1, in the concentration kettle, add nickel sulfate solution, wherein, the nickel content in the nickel sulfate solution is not less than 80g / L, then carry out heating concentration with the heating rate of 2 ℃ / min, in the process of heating concentration, stir with 5Hz. The frequency is continuously stirred until the concentration of the nickel sulfate solution reaches 65 Baume degrees to obtain the first solution;

[0036] Step 2, transfer the first solution obtained in step 1 into the crystallization kettle for cooling crystallization, and cool at a cooling rate of 20°C / h until the cooling temperature drops to 60°C, use a 50-mesh sieve to crystallize the nickel sulfate seeds. Treatment, adding the treated nickel sulfate crystal seed to the first solution, the ratio of adding the ni...

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Abstract

The invention discloses a method for preparing large-particle nickel sulfate crystals. The method includes adding nickel sulfate solution to a concentration kettle, and heating and concentrating at a heating rate of 0.5 to 2°C / min until the concentration of the nickel sulfate solution reaches 55 to 55°C / min. 65 Baume degrees, obtain the first solution, transfer the first solution to the crystallization kettle for cooling and crystallization, control the cooling rate until the cooling temperature drops to 60±2°C, add nickel sulfate seed crystals to the first solution, and then, in sequence Aging crystallization, centrifugal separation, and drying are carried out to obtain nickel sulfate crystals; in this way, the present invention can effectively solve the problem of sulfuric acid by strictly controlling the cooling rate and cooling temperature, and at the same time strictly controlling the time and proportion of adding nickel sulfate seed crystals. The nickel crystal has poor crystal shape, small particle size and uneven particle size distribution, and obtains large and uniform nickel sulfate crystals with large particle size and uniform particle size.

Description

Technical field [0001] The invention belongs to the technical field of preparation of nickel sulfate, and specifically relates to a preparation method of large particle nickel sulfate crystals. Background technique [0002] Nickel sulfate is widely used in semiconductors, printed circuit boards (PCB), batteries, electroless plating, electroplating and other industries. It is the main nickel salt for electroplating nickel and alloys, electroless nickel plating and alloys and batteries, and is also the main source of metal nickel ions. It can also be used as an additive in cadmium plating and zinc plating. In the inorganic industry, it is used as a nickel catalyst and other nickel salts such as nickel chloride, nickel oxide, nickel carbonate, etc. It is also used in the manufacture of nickel-cadmium batteries, catalysts for hardened oils or paints, mordants for vat dyes, metal colorants, etc. [0003] At present, the production of nickel sulfate in my country usually adopts ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/10
CPCC01G53/10C01P2006/80
Inventor 许开华陈龙张礼明姚敏王超杨春
Owner JINGMEN GEM NEW MATERIAL