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A kind of preparation method of high-purity zinc sulfate monohydrate

A technology of zinc sulfate and zinc sulfate solution, applied in zinc sulfate and other directions, can solve problems such as corrosion of pipelines and concentration kettles, and achieve the effect of solving easy corrosion of pipelines and equipment

Active Publication Date: 2021-02-09
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of this invention is to provide a kind of preparation method of high-purity zinc sulfate monohydrate, by adjusting the pH value of zinc sulfate solution, solve the problem of directly concentrating the zinc sulfate solution with too low pH value in the existing preparation method, which is easy to cause pipeline damage Concentrator corrosion problem

Method used

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  • A kind of preparation method of high-purity zinc sulfate monohydrate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Step 1, zinc sulfate solution and pH adjustment solution are added to reaction still, and pH adjustment solution is 10mol / L liquid caustic soda, adjust pH to 9.0, make the Zn in the solution 2+ Precipitate as Zn(OH) 2 After reacting for 30 minutes, pass through the filter press to obtain the zinc hydroxide filter residue, use pure water to slurry the zinc hydroxide filter residue, and pump it into the washing kettle, add pure water to fill the washing kettle, heat up to 50 ° C and stir for 30 minutes and After filtering and repeating the washing operation twice, a high-purity filter residue is obtained, and the Na in the filter residue is detected + The content of Na in the high-purity filter residue + The content is 0.08wt.%, using zinc sulfate solution to re-slurry the high-purity filter residue to obtain zinc hydroxide slurry;

[0047] Step 2, adding the zinc sulfate solution to the callback kettle, opening the steam valve, adjusting the reaction temperature to 50°...

Embodiment 2

[0052] Step 1, zinc sulfate solution and pH adjustment solution are added to reactor and reacted, pH adjustment solution is 8mol / L liquid caustic soda, adjust pH to 9.5, make the Zn in the solution 2+ Precipitate as Zn(OH) 2 After reacting for 40 minutes, pass through the filter press to obtain the zinc hydroxide filter residue, use pure water to slurry the zinc hydroxide filter residue, and pump it into the washing kettle, add pure water to fill the washing kettle, heat up to 40 ° C and stir for 60 minutes and After filtering and repeating the washing operation twice, a high-purity filter residue is obtained, and the Na in the filter residue is detected + The content of Na in the high-purity filter residue + The content is 0.06wt.%, using zinc sulfate solution to re-slurry the high-purity filter residue to obtain zinc hydroxide slurry;

[0053] Step 2, adding the zinc sulfate solution to the callback kettle, opening the steam valve, adjusting the reaction temperature to 40°...

Embodiment 3

[0057] Step 1, zinc sulfate solution and pH adjustment solution are added to reactor and reacted, pH adjustment solution is 5mol / L liquid caustic soda, adjust pH to 9.3, make the Zn in the solution 2+ Precipitate as Zn(OH) 2 After reacting for 30 minutes, pass through the filter press to obtain the zinc hydroxide filter residue, use pure water to slurry the zinc hydroxide filter residue, and pump it into the washing kettle, add pure water to fill the washing kettle, raise the temperature to 45 ° C and stir for 60 minutes and After filtering and repeating the washing operation twice, a high-purity filter residue is obtained, and the Na in the filter residue is detected + The content of Na in the high-purity filter residue + The content is 0.09wt.%, using zinc sulfate solution to re-slurry the high-purity filter residue to obtain zinc hydroxide slurry;

[0058] Step 2, adding the zinc sulfate solution to the reaction kettle, opening the steam valve, adjusting the reaction temp...

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Abstract

The invention discloses a preparation method of high-purity zinc sulfate monohydrate, which specifically includes the following steps: step 1, adding zinc sulfate solution and pH value adjustment solution into a reaction kettle for reaction, after the reaction is completed, press filtration and separation to obtain filter residue, and use sulfuric acid Slurry the filter residue with zinc solution to obtain Zn-containing 2+ Slurry; step 2, zinc sulfate solution is added to callback still, adopts the Zn-containing that step 1 makes 2+ The pH value of the slurry callback zinc sulfate solution is filtered and separated to obtain the zinc sulfate filtrate after the pH value callback; step 3, the zinc sulfate filtrate obtained in step 2 is evaporated and concentrated to obtain a concentrated material; step 4, the concentrated material Centrifuge, heat and sieve to obtain zinc sulfate monohydrate powder. The present invention utilizes the zinc sulfate solution produced in the back-extraction process to prepare high-purity zinc hydroxide slurry or high-purity zinc carbonate slurry, and uses it to adjust the pH value of the zinc sulfate solution, which solves the problem that pipelines and equipment are easily corroded due to direct concentration of zinc sulfate solution question.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic compounds, and in particular relates to a preparation method of high-purity zinc sulfate monohydrate. Background technique [0002] With the increasing frequency of chemical production activities, the industrial waste generated has greatly increased both in terms of quantity and type. The discharge and storage of industrial waste not only occupies a large amount of land, but also poses a great pollution and threat to the environment by toxic heavy metals. . [0003] At present, zinc and cadmium contained in industrial waste residues have increasingly become a secondary resource with development and utilization value. Zinc sulfate monohydrate has been widely used in feed additives, chemicals, fertilizers, mineral processing, pharmaceuticals, rubber, electronics, electroplating, Viscose fiber and other fields. [0004] A large amount of ZnSO will be produced during the stripping p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G9/06
CPCC01G9/06C01P2004/03C01P2004/30C01P2004/50C01P2004/61
Inventor 刘炼谢贻斌杨刚吴国伟
Owner JINGMEN GEM NEW MATERIAL
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