Crystallization method for cobalt chloride solution

Abstract

The invention discloses a crystallization method for a cobalt chloride solution. The method comprises the following steps: evaporating and concentrating the cobalt chloride solution; cooling the evaporated and concentrated cobalt chloride solution in a water bath kettle to enable cobalt chloride crystal grains to naturally grow, and turning off the water bath kettle when the temperature of the water bath kettle is lowered to 30 to 35 DEG C; performing natural grain growth on the naturally growing cobalt chloride crystal grains at room temperature for 15 to 20h, and performing suction filtration to obtain a cobalt chloride crude product; performing liquid-solid separation when the temperature of the cobalt chloride crude product is lowered to 20 to 25 DEG C, naturally air-drying the cobaltchloride crude product subjected to liquid-solid separation to obtain a refined cobalt chloride product of which the particle sizes are relatively large and the quality accords to a national standard.The crystallization rate of the obtained cobalt chloride product can reach 60 to 75 percent and, in addition, the crystal grains are uniform in size and crystal color.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a crystallization method of cobalt chloride solution. Background technique [0002] The traditional crystallization method of salt products is to concentrate the salt solution to a certain specific gravity, put it in the crystallization equipment, pass cooling water into the crystallization equipment to cool the salt solution to a certain temperature, add seed crystals, and then grow crystals , after the seed crystal gradually turns into a large particle product, the liquid-solid separation is carried out to obtain the product. The quality of the seed crystal ingredients added in the crystallization process of traditional salt products directly determines the quality of the product. For the crystallization of cobalt chloride solution, the cobalt chloride product produced by the traditional crystallization method has uneven crystal particle size, uneven crystal color an...

AI Technical Summary

Problems solved by technology

For the crystallization of cobalt chloride solution, the cobalt chloride product produced by the traditional crystallization method has uneven crystal particle size, uneven crystal color and low crystallization rate, which affects the appearance quality and output of cobalt chloride products, thereby increasing production costs

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