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A kind of method that uses zinc-containing waste liquid as raw material to prepare zinc oxide

A technology of zinc oxide and waste liquid, applied in the direction of zinc oxide/zinc hydroxide, etc., can solve the problems of ineffective removal of impurity elements and cumbersome washing procedures, and achieve the effects of reducing the content of impurity ions, improving washing effect, and low production cost

Inactive Publication Date: 2011-12-28
昆山德阳新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The economic and social benefits of this technology are obvious, but there are also the shortcomings of cumbersome washing procedures and impurity elements that cannot be effectively removed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The present embodiment provides a kind of preparation method of zinc oxide, specifically as follows:

[0019] (1) Take 200mL of zinc-containing waste liquid, add potassium hydroxide until the pH value of the mixture is 6.0, precipitate out, filter, and obtain zinc-containing material;

[0020] (2) Use a mixed aqueous solution of ammonium nitrate and oxalic acid (the mass content of ammonium nitrate is 10%, and the mass content of oxalic acid is 5%) to wash the zinc-containing material, then wash it with deionized water, and then wash it at a temperature of 200 It was dried at ℃ for 3 hours, calcined at 700℃ for 4 hours, and finally crushed to obtain 13.4 g of zinc oxide. After testing, the purity of the obtained zinc oxide was 99.6%.

Embodiment 2

[0022] The present embodiment provides a kind of preparation method of zinc oxide, specifically as follows:

[0023] (1) Take 350mL of zinc-containing waste liquid, add sodium bicarbonate until the pH value of the mixture is 6.2, precipitate out, filter, and obtain zinc-containing material;

[0024] (2) Use a mixed aqueous solution of ammonium nitrate and oxalic acid (the mass content of ammonium nitrate is 12.5%, and the mass content of oxalic acid is 8.5%) to wash the zinc-containing material, then wash it with deionized water, and then wash it at a temperature of 150 It was dried at ℃ for 4 hours, calcined at 800℃ for 3 hours, and finally crushed to obtain 24.2 g of zinc oxide. After testing, the purity of the obtained zinc oxide was 99.8%.

Embodiment 3

[0026] The present embodiment provides a kind of preparation method of zinc oxide, specifically as follows:

[0027] (1) Take 500mL of zinc-containing waste liquid, add ammonia water until the pH value of the mixture is 6.5, precipitate out, and filter to obtain zinc-containing material;

[0028] (2) Use a mixed aqueous solution of ammonium nitrate and oxalic acid (the concentration of ammonium nitrate is 20%, and the concentration of oxalic acid is 9.5%) to wash the zinc-containing material, then wash it with deionized water, and then successively wash it at a temperature of 120°C. Dry for 5 hours, bake at 600°C for 5 hours, and finally grind to obtain 33.5 g of zinc oxide. After testing, the purity of the obtained zinc oxide was 99.7%.

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Abstract

The present invention relates to a method for preparing zinc oxide by using zinc-containing waste liquid as a raw material, which includes (1) taking zinc-containing waste liquid, adding a precipitant to precipitate zinc particles in the waste liquid in the form of precipitation, and filtering to obtain zinc-containing material , the precipitating agent is one or more of potassium hydroxide, sodium hydroxide, bicarbonate, carbonate and ammonia water; (2), using a mixed aqueous solution of ammonium nitrate and oxalic acid to wash the zinc-containing material, Then wash with deionized water, dry, roast, and pulverize to obtain zinc oxide powder with a purity of more than 99.5%. The drying is carried out at a temperature of 100°C to 300°C, and the roasting is carried out at a temperature of 600°C to 800°C. The purity of the zinc oxide obtained by the method of the invention is as high as 99.5%. In addition, the process of the invention is simple, the production cost is low, and it is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing zinc oxide by using zinc-containing waste liquid as a raw material. Background technique [0002] Zinc oxide powder is an important functional material, which is widely used in the fields of rubber cables, medicine, electronics, ceramics, chemical fibers, petrochemicals, optics and food industries. [0003] The discharge of zinc-containing waste liquid is a serious hazard to human health and industrial and agricultural activities. It has the characteristics of persistence, high toxicity, and serious pollution. Once it enters the environment, it cannot be degraded. Most of it participates in the food chain cycle and eventually accumulates in organisms. It destroys the normal physiological and metabolic activities of organisms and endangers human health. Therefore, it is particularly important to rationally treat zinc-containing waste liquid. [0004] The document "Recovering Zinc Oxide from Waste Liquid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02
Inventor 廖奕坤徐佳琦柏琳朱婷
Owner 昆山德阳新材料科技有限公司
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