Production method of zinc sulfate monohydrate

A production method, the technology of zinc sulfate, applied in the direction of zinc sulfate, etc., can solve the problems of damage and affecting the quality of feed, and achieve the effects of easy mixing and processing, stable physical and chemical properties, and not easy to deliquesce and oxidize

Inactive Publication Date: 2012-02-15
HANGZHOU FUYANG XINXING INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zinc sulfate monohydrate prepared from the above different raw materials, after a strong oxidant to completely remove iron, zinc sulfate monohydrate has a strong destructive effect on ferrous ions in feed, making it oxidized to ferric ions that are not absorbed by animals, affecting feed quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Using 10.2T zinc waste as the starting material, of which zinc waste contains 24.42% zinc, 12.8% lead, 0.11% cadmium, 0.1% arsenic, 5.6% iron, and the remaining impurities are organic matter and silica gel. Use 38m 3 5.1 tons of sulfuric acid with a concentration of 95% was added, reacted at 70°C for 120 minutes, and the pH value of the reaction end point was controlled to be greater than 4.5. After the reaction was completed, the solution was separated by pressure filtration to obtain zinc sulfate-containing liquid and solid impurities;

[0025] 2) The solution containing zinc sulfate is oxidized with air at 75°C for 180 minutes to generate a primary purification solution containing zinc sulfate;

[0026] 3) Add 4g / l zinc powder and 1g / l activated carbon to the primary purification solution containing zinc sulfate, and react at 45°C for 75 minutes to obtain the secondary purification zinc sulfate solution and secondary purification slag;

[0027] 4) Add 3g / l zinc po...

Embodiment 2

[0031] 1) Using 10T of waste zinc as the starting material, of which waste zinc contains 26.14% zinc, 13.01% lead, 0.12% cadmium, 0.1% arsenic, and 4.8% iron, use 40m 3 4.95 tons of sulfuric acid with a concentration of 93% was added, reacted at 65°C for 100 minutes, and the pH value at the end of the reaction was controlled to be greater than 4.5. After the reaction was completed, the solution was separated by pressure filtration to obtain zinc sulfate-containing liquid and solid impurities;

[0032] 2) The solution containing zinc sulfate is oxidized with air at 65°C for 200 minutes to generate a primary purification solution containing zinc sulfate;

[0033] 3) Add 3.5g / l zinc powder and 0.8g / l activated carbon to the primary purification solution containing zinc sulfate, and react at 35°C for 85 minutes to obtain the secondary purification zinc sulfate solution and secondary purification slag;

[0034] 4) Add 2.5g / l zinc powder to the zinc sulfate-containing solution for s...

Embodiment 3

[0038] 1) Using 10T waste zinc as the starting material, which contains 28.89% zinc, 15% lead, 0.1% cadmium, 0.1% arsenic, and 5.9% iron, use 40m 3 5.5 tons of sulfuric acid with a concentration of 98% was added, reacted at 75°C for 150 minutes, and the pH value of the reaction end point was controlled to be greater than 4.5. After the reaction was completed, the solution was separated by pressure filtration to obtain zinc sulfate-containing liquid and solid impurities;

[0039] 2) The solution containing zinc sulfate is oxidized with air at 80°C for 160 minutes to generate a primary purification solution containing zinc sulfate;

[0040] 3) Add 5g / l zinc powder and 1.2g / l activated carbon to the primary purification solution containing zinc sulfate, and react at 60°C for 65 minutes to obtain the secondary purification zinc sulfate solution and secondary purification slag;

[0041] 4) Add 4.5g / l zinc powder to the zinc sulfate-containing solution for secondary purification, an...

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Abstract

A production method of zinc sulfate monohydrate belongs to the technical field of inorganic chemical industry and comprises the following steps of: 1) dissolving waste zinc to obtain a zinc sulfate solution and solid impurities; 2) carrying out air oxidation on the zinc sulfate solution to obtain a first purified zinc sulfate solution; 3) adding a zinc powder and active carbon into the first purified zinc sulfate solution to obtain a second purified zinc sulfate solution and second purified slag; 4) adding the zinc powder into the second purified zinc sulfate solution to obtain a third purified zinc sulfate solution and third purified slag; 5) carrying out evaporation concentration and centrifugal separation on the third purified zinc sulfate solution to obtain hydrous zinc sulfate and a mother liquor; 6) drying the hydrous zinc sulfate to obtain the product zinc sulfate monohydrate. The technologies of two extraction and three purification, mother liquor circulation and diversion as well as two-iron activation are adopted to prepare high-efficient reductive feed grade zinc sulfate product.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, in particular to a production method of zinc sulfate monohydrate. Background technique [0002] Traditional zinc sulfate monohydrate is used in the feed industry. Due to the use of enhanced oxidant iron removal process, strong oxidant remains in zinc sulfate monohydrate, which makes it easy to oxidize the nutrients in the feed and easily lead to deterioration of the feed. The traditional zinc sulfate monohydrate has the following several technological processes: 1) Using zinc sulfide roasted ore as raw material, one-time leaching, strong oxidant in the zinc-containing liquid is oxidized to remove iron, the iron-removing liquid zinc powder removes impurities, the impurity removal solution is concentrated and crystallized, and the crystallization is baked. Drying gives the final product zinc sulfate monohydrate. 2) Using zinc oxide as the raw material, the process is the same a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/06
Inventor 何建兴
Owner HANGZHOU FUYANG XINXING INDAL
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