Zinc sulfate heptahydrate particle increase method

A technology of zinc sulfate heptahydrate and particles, which is applied in the field of zinc sulfate preparation, can solve problems such as low crystallization production efficiency, and achieve the effects of shortening crystallization time, reducing production costs, and good particle size distribution

Active Publication Date: 2017-07-21
山西卓联锐科科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual production, in order to produce large particles of zinc sulfate heptahydrate crystals, usually the crystallization time is as long as ten hours, and the crystallization production efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] A method for increasing zinc sulfate heptahydrate particles, comprising the following steps: (1) after acid leaching and impurity removal, the stock solution is evaporated and concentrated at a negative pressure of 65°C in an evaporator, and the Baume degree of the concentrated sample solution is 52Be (2) place the concentrated zinc sulfate solution in a well-stirred crystallizer at a constant temperature of 50°C, then slowly cool down to 35°C, and a small amount of fine crystals appear; (3) mix the mixture in step (2) The solution is warmed up to 50° C., and continuously stirred until the crystals are completely dissolved while the temperature is rising; (4) the solution obtained in step (3) is slowly cooled to 37° C.; (5) 5 g of seed crystals are added to the solution of step (4), Then the solution was slowly cooled to 30° C. for 6 hours until a large number of zinc sulfate heptahydrate crystals with large particles were precipitated.

Embodiment 2

[0010] A method for increasing zinc sulfate heptahydrate particles, comprising the following steps: (1) after acid leaching and impurity removal, the stoste is evaporated and concentrated at a negative pressure of 65°C in an evaporator, and the Baume degree of the concentrated sample solution is 53Be (2) place the concentrated zinc sulfate solution in a well-stirred crystallizer and maintain a constant temperature of 55°C, then slowly cool down to 40°C, and a small amount of fine crystals appear; (3) mix the mixture in step (2) The solution is warmed up to 55° C., and continuously stirred until the crystals are completely dissolved while the temperature is rising; (4) the solution obtained in step (3) is slowly cooled to 42° C.; (5) 8 g of seed crystals are added to the solution of step (4), Then the solution was slowly cooled to 33°C for 7 hours until a large number of large zinc sulfate heptahydrate crystals were precipitated.

Embodiment 3

[0012] A method for increasing zinc sulfate heptahydrate particles, comprising the following steps: (1) after acid leaching and impurity removal, the stoste is evaporated and concentrated at a negative pressure of 65°C in an evaporator, and the Baume degree of the concentrated sample solution is 54Be (2) place the concentrated zinc sulfate solution in a well-stirred crystallizer and keep the temperature at 60°C, then slowly cool down to 45°C, and a small amount of fine crystals appear; (3) mix the mixture in step (2) The solution is warmed up to 60°C, and continuously stirred until the crystals are completely dissolved while the temperature is rising; (4) the solution obtained in step (3) is slowly cooled to 48°C; (5) 10g of seed crystals are added to the solution in step (4), Then the solution was slowly cooled to 35°C for 8 hours until a large number of zinc sulfate heptahydrate crystals with large particles were precipitated.

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PUM

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Abstract

The invention relates to a zinc sulfate heptahydrate particle increase method. The method includes the steps of: (1) conducting acid dipping and impurity removal on a stock solution, then carrying out evaporation concentration under a negative pressure at 65DEG C in an evaporator, thus obtaining a concentrated sample solution with a Baume degree of 52-54Be; (2) placing the concentrated zinc sulfate solution in a stirring crystallizer and maintaining a constant temperature at 50-60DEG C, then performing slow cooling to 35-45DEG C, thus obtaining a small amount of fine crystals; (3) heating the mixed solution of step (2) to 50-60DEG C, and at the same time performing continuous stirring until the crystals are completely dissolved; (4) slowing cooling the solution obtained by step (3) to 37-48DEG C; and (5) adding 5-10g of a seed crystal into the solution of step (4), then slowly cooling the solution to 30-35DEG C for 6-8h, thus obtaining a lot of precipitated large particle zinc sulfate heptahydrate crystals. The method provided by the invention acquires large particle zinc sulfate heptahydrate, at the same time, the crystallization time is shortened, and the production efficiency is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of zinc sulfate preparation, and in particular relates to a method for enlarging zinc sulfate heptahydrate particles. Background technique [0002] Zinc sulfate heptahydrate (ZnSO47H2O), also known as zinc alum, alum, the product is generally used as a mordant, wood preservative, animal glue clarifier, leather preservative, bleaching agent (papermaking) in industry; Emetic, astringent, in addition, it is also used in man-made fibers, electrolysis, electroplating industry, and the manufacture of pesticides, zinc salts (including lithopone). Zinc sulfate heptahydrate is colorless orthorhombic crystal, granule and powder, odorless and astringent. [0003] In industrial production, the zinc sulfate solution is concentrated and then cooled to 39°C for crystallization to produce zinc sulfate heptahydrate. Among them, crystallization is a very important unit operation. Zinc sulfate heptahydrate can remove most o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/06
CPCC01G9/06
Inventor 李涛杨明明岳晓丽
Owner 山西卓联锐科科技有限公司
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