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A kind of crystallization method of nickel sulfate solution

A solution crystallization, nickel sulfate technology, applied in the direction of improving process efficiency, can solve the problems of non-crystallization, inconsistent crystal form, non-forming, etc., and achieve the effects of fast crystallization, stable crystal form, and uniform particle size.

Active Publication Date: 2020-10-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has several shortcomings: if the concentration is not enough, it will lead to slow crystallization or no crystallization, if the concentration is too high, it will lead to rapid precipitation of a large number of fine crystals, which will not form; direct cooling and crystallization may lead to inconsistent crystal forms; in addition, after concentration, Too high acid concentration in the solution will also affect the crystallization effect

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  • A kind of crystallization method of nickel sulfate solution
  • A kind of crystallization method of nickel sulfate solution
  • A kind of crystallization method of nickel sulfate solution

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Experimental program
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Effect test

Embodiment 1

[0029] The embodiment of the present invention provides a method for crystallizing the nickel sulfate solution recovered after the electroless nickel plating waste liquid is treated by solvent extraction. The concentration of nickel in the nickel sulfate solution obtained after extraction and stripping by solvent extraction is 16.4g / L, and the pH is 1.634.

[0030] After the nickel sulfate solution is heated and concentrated, its density is 1.4259g / cm 3 , stir and cool down to 60°C, take 25mL into two beakers respectively, add load b (cylindrical porous polypropylene plastic, diameter 20mm, internal hole diameter 3mm, cylindrical plastic height 30mm) into beaker A1; beaker A2 No loading is added. The two beakers were left standing at room temperature for 8h. After taking out the load, remove the above crystals, and after drying, weigh the total mass of the load without adding and adding the load to be 2.778g and 3.8909g respectively. The particle size distribution of crysta...

Embodiment 2

[0033] The embodiment of the present invention provides a method for crystallizing the nickel sulfate solution recovered after the electroless nickel plating waste liquid is treated by solvent extraction. The concentration of nickel in the nickel sulfate solution obtained after extraction and stripping by solvent extraction is 14.3g / L, and the pH is 0.75.

[0034] After the nickel sulfate solution is concentrated, its density is 1.4128g / cm 3 , stir and cool down to 62°C, take 25mL into two beakers respectively, add load b (cylindrical porous polypropylene plastic, diameter 20mm, internal hole diameter 3mm, cylindrical plastic height 30mm) into beaker B1; beaker B2 does not Plus, the two beakers were left at room temperature for 10h. After taking out the load, remove the above crystals, and after drying, weigh the total mass of the load without adding and adding the load to be 5.854g and 6.6297g respectively. The particle size distribution of crystallization under the two con...

Embodiment 3

[0037] The embodiment of the present invention provides a method for crystallizing the nickel sulfate solution recovered after the electroless nickel plating waste liquid is treated by solvent extraction. The concentration of nickel in the nickel sulfate solution obtained after extraction and stripping by solvent extraction is 18.5 g / L, and the pH is 0.56.

[0038] After the nickel sulfate solution is concentrated, its density is 1.4256g / cm 3 , stir and cool down to 55°C, take 25mL into two beakers respectively, add load a (frosted ceramic piece, area about 2500mm) into beaker C1 2 , thickness is 4mm), beaker C2 is not loaded. The two beakers were left to stand at room temperature for 11 hours. After taking out the load, remove the above crystals, and after drying, weigh the total mass of the load without adding and adding the load to be 2.5688g and 3.2023g respectively. The particle size distribution of crystallization under the two conditions is as follows: Figure 7 and...

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Abstract

The invention discloses a crystallization method of nickel sulfate. The crystallization method of nickel sulfate comprises the following steps: concentrating a nickel sulfate solution till the densityis 1.01-5.0 g / cm<3>; stirring the concentrated nickel sulfate solution at constant temperature and cooling the same to 30-65 DEG C, and adding a load into the concentrated solution; leaving the solution to stand to crystal for 2-48 hours at constant temperature; and after crystallization, taking the load out and separating the mother liquor from crystals, and taking the crystals which are dried from the load to obtain the nickel sulfate crystals. By way of adding the load into the concentrated nickel sulfate solution, most crystals are separated out quickly and stably on the load. The methodhas the advantages that the crystals are separated out quickly. Compared with the conventional concentrated crystallization modes, the method is more stable, and the crystals are unlikely to agglomerate, stable in crystal form, uniform in particle size and easy to separate from the mother liquor and the like. The method is suitable for recovering nickel from chemical nickel plated waste liquor orother nickel-containing industrial waste liquor to obtain the crystals of the nickel sulfate solution.

Description

technical field [0001] The invention belongs to the technical field of crystallization, and relates to a method for crystallizing a nickel sulfate solution. This application claims the priority of the patent application No. 2017113437903 filed on December 4, 2017. Background technique [0002] Industrial production fields such as electroplating nickel and electroless nickel plating will produce a large amount of nickel-containing waste liquid, because the recovery value of nickel is high, and nickel is very harmful to the environment and human body, which leads to the inevitability of the recovery of nickel in nickel-containing waste liquid . [0003] At present, there are many recovery methods for nickel, including precipitation method, electrolysis method, ion exchange method, solvent extraction method, etc., except for direct conversion into nickel element or direct preparation of new materials, many final recovery of nickel is nickel sulfate The form of precipitation m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B23/00
CPCC22B7/006C22B23/0453Y02P10/20
Inventor 黄瑛邱玉雪查戎熊振峰
Owner SOUTHEAST UNIV