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Crystal growth method during alpha-type six hydration nickel sulfate interval crystallization process

A technology of nickel sulfate hexahydrate and crystal growth, applied in nickel sulfate and other directions, can solve the problems of extensive control of nickel sulfate variables, dullness, difficult filtration, etc., and achieves easy aggregation or agglomeration, smooth and shiny surface, and strong market. The effect of competitiveness

Active Publication Date: 2007-10-31
GUANGDONG GUANGHUA SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 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. However, 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, resulting in 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, this causes difficulty in filtration, low yield per pass, on the other hand, the purity and content of the product are low, and only It belongs to the second-level product and cannot meet the different requirements of customers
There are foreign literatures that use the method of adding seeds or multiple cycles of crystallization to control the crystallization process, but the average particle size of the obtained crystals is about 0.1mm

Method used

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  • Crystal growth method during alpha-type six hydration nickel sulfate interval crystallization process

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Weigh 100g of industrial-grade nickel sulfate hexahydrate, add 71.6ml of deionized water to mix, use a low-temperature thermostat to raise the temperature of the solution to 65°C, stir to dissolve, control the stirring rate at 150 rpm, and keep warm for 30 minutes; After complete dissolution, adjust the stirring rate to 100 rpm, and linearly cool down to T within 30 minutes with a linear function T=65-0.5t 0 After = 50°C, add 0.5g seed crystals with a particle size of 0.25mm, and use the cubic function T = T 0 - ( T 0 - 31.5 ) × ( t t f ) 3 Curve cooling for cooling and crystallization, when the temperature drops to 31.5°C, the crystal l...

Embodiment 2

[0022] Weigh 88.8g of industrial-grade nickel sulfate hexahydrate, add 63.5ml of deionized water to mix, use a low-temperature thermostat to raise the solution temperature to 65°C, stir to dissolve, control the stirring rate at 140 rpm, and keep warm for 60 minutes; After completely dissolving, adjust the stirring rate to 80 rpm, and linearly lower the temperature to T within 20 minutes with a linear function T=65-0.5t 0 After = 55°C, add 0.3g seed crystals with a particle size of 0.2mm, and use the cubic function T = T 0 - ( T 0 - 31.5 ) × ( t t f ) 3 Curve cooling for cooling and crystallization, when the temperature drops to 32°C, centrifuge...

Embodiment 3

[0024] Weigh 88.8g of industrial-grade nickel sulfate hexahydrate, add 63.5ml of deionized water to mix, use a low-temperature thermostat to raise the solution temperature to 65°C, stir to dissolve, control the stirring rate at 160 rpm, and keep warm for 60 minutes; After complete dissolution, adjust the stirring speed to 90 rpm, and linearly cool down to T within 20 minutes with a linear function T=65-0.5t 0 After =55°C, add 0.2g seed crystals with a particle size of 0.3mm, and use the cubic function T = T 0 - ( T 0 - 31.5 ) × ( t t f ) 3 Curve cooling for cooling and crystallization, when the temperature drops to 31.5°C, the crystal slurry is...

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Abstract

The invention discloses a crystal growing method of alpha type hexahydrate nickel sulfate batch crystallization process, which comprises the following steps: allocating a finite density nickel sulfate solution; heating to a finite temperature; stirring to complete dissolve; proceeding cooled crystallization through controlling detemperature rate, stirring rate and adding crystal with a finite quantity and grain size; centrifugalizing the crystalline liquid; getting the crystal; drying under a finite temperature; getting the end product. This product possesses big grain size, even distribution, good crystal system and strong market competitive power.

Description

technical field [0001] The invention belongs to the technical field of crystallization, in particular to a method for crystal growth in the batch crystallization process of alpha-type nickel sulfate hexahydrate. 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 of 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 galvanizing. In the inorganic industry, it is used to produce nickel catalysts 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 hardening oils or paints, mordants for vat dyes, metal colorants, etc. [0003] Nickel sulfate has three types: anhydrous, hexahyd...

Claims

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Application Information

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IPC IPC(8): C01G53/10
Inventor 江燕斌楚玉宽郑韧余军文钱宇
Owner GUANGDONG GUANGHUA SCI TECH
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