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Preparation technology of zinc sulfate heptahydrate by cold liquid hot flushing method

A zinc sulfate heptahydrate, production process technology, applied in the direction of zinc sulfate, solution crystallization, heat exchange cooling crystallization, etc., can solve the problems of large specific surface area, insufficient zinc content, easy agglomeration, etc., achieve coarse particles and improve production efficiency And product quality, easy drying effect

Inactive Publication Date: 2017-08-29
SHANDONG DAZHENG ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the crystallization time is not enough, only fine-grained products can be obtained. Because of the large specific surface area, more free water is absorbed, and it is difficult to dry in the centrifuge, resulting in insufficient main-grade zinc content and easy agglomeration, which becomes an unqualified product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0017] (1) In the crystallization tank, add half a tank of purified saturated solution liquid that has been evaporated and concentrated at about 50°C-60°C, quickly cool it to 40°C with circulating cooling water, and stir slowly to allow it to crystallize for 6 hours. The liquid temperature is 39°C, and there are a large number of fine crystals of zinc sulfate heptahydrate, and then the cooling water is turned on, and the crystals are rapidly cooled to 35°C to obtain a relatively cold solution.

[0018] (2) Another half tank of hot saturated solution concentrated at 42°C is pumped into the above half tank of cold solution. After fully stirring, the temperature of the mixed solution is quickly cooled to 39°C with circulating cooling water, and then cooled with cooling water. Crystallize for 4 hours to 35°C, and dry it with an 8000r / min centrifuge. The obtained zinc sulfate heptahydrate product has a zinc content of 22.47%, a particle size of 0.28mm, and a free water content of 2....

Embodiment 2

[0020] (1) In the crystallization tank, add half a tank of purified saturated solution liquid that has been evaporated and concentrated at about 50°C-60°C, quickly cool it to 40°C with circulating cooling water, and stir slowly to allow it to crystallize for 6 hours. The liquid temperature is 39°C, and there are a large number of fine crystals of zinc sulfate heptahydrate, and then the cooling water is turned on, and the crystals are rapidly cooled to 35°C to obtain a relatively cold solution.

[0021] (2) Another half tank of the hotter saturated solution concentrated at 42°C is pumped into the colder solution in the crystallization tank. After fully stirring, the temperature of the mixed solution is quickly cooled to 39°C with circulating cooling water, and then cooled Water cooled and crystallized to 33°C for 4.5 hours, and dried by a centrifuge. The obtained zinc sulfate heptahydrate product had a zinc content of 22.43%, a particle size of 0.29mm, and a free water content o...

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Abstract

The invention discloses a preparation technology of zinc sulfate heptahydrate by a cold liquid hot flushing method. The preparation technology comprises the following steps of quickly cooling a saturated zinc sulfate solution for the first time, crystallizing, quickly cooling for the second time, adding a hot saturated solution, quickly cooling for the third time, cooling by cooling water, and crystallizing, so as to obtain a zinc sulfate heptahydrate product. The preparation technology has the advantages that when the zinc sulfate heptahydrate is applied to the industrial production, the large-particle zinc sulfate crystal can be obtained; the content of free water in the product is obviously reduced, the crystallizing time is shortened, and the production efficiency and the product quality are improved.

Description

technical field [0001] The invention relates to the technical field of zinc sulfate heptahydrate production, in particular to a production process for preparing zinc sulfate heptahydrate by hot flushing with cold liquid. Background technique [0002] In industrial production, zinc sulfate heptahydrate is a crystallized product of concentrated zinc sulfate saturated solution below 39°C. Coarse crystals are easy to dehydrate, and the quality of the product is better because it absorbs less impurities. Obtaining a product with coarse crystal grains requires prolonging the crystallization time, and the crystallization time in actual production is as long as about 20 hours. If the crystallization time is not enough, only fine-grained products can be obtained. Because of the large specific surface area, more free water is absorbed, and it is difficult to dry in the centrifuge, resulting in insufficient main-grade zinc content and easy agglomeration, which becomes an unqualified p...

Claims

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Application Information

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IPC IPC(8): C01G9/06B01D9/02
CPCC01G9/06B01D9/0013C01P2004/60C01P2006/82
Inventor 韩冰徐公美黄玉安
Owner SHANDONG DAZHENG ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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