Process for producing nano zinc oxide by using crude zinc oxide

A nano-zinc oxide and sub-zinc oxide technology, applied in zinc oxide/zinc hydroxide, nanotechnology, nanotechnology, etc., can solve problems affecting the normal production of enterprises, affecting soil and water quality, wasting resources, etc., and achieve saving carbide slag , to avoid pollution, to eliminate the effect of external waste liquid

Inactive Publication Date: 2014-01-01
JIYUAN VOCATIONAL & TECHN COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of producing polyvinyl chloride, a large amount of by-product hydrochloric acid will also be produced. Due to the influence of national policies and economic conditions, zero-price sales cannot deal with the accumulated hydrochloric acid. If it is not treated, it will affect the normal production of enterprises. At present, many chlor-alkali The factory adopts the method of landfill after reacting hydrochloric acid with carbide slag, which not only wastes resources, but also has a certain impact on the surrounding soil and water quality

Method used

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  • Process for producing nano zinc oxide by using crude zinc oxide
  • Process for producing nano zinc oxide by using crude zinc oxide
  • Process for producing nano zinc oxide by using crude zinc oxide

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Experimental program
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Embodiment 1

[0014] Use secondary zinc oxide (the main component is ZnO, the grade is generally 82%) to react with hydrochloric acid (the reaction condition is that the liquid-solid ratio is 5.5 L / kg, and the volume ratio of concentrated hydrochloric acid to water is V 浓酸 / V 水 is 0.75, the mass concentration of concentrated hydrochloric acid is 36%, the reaction temperature is 40°C, and the reaction time is 120min). Then filter the obtained solution, add NaClO solution (0.18g / kg secondary zinc oxide) to the filtrate, control the pH value to 5, react at a temperature of 70°C, react for 2h, age for 0.5h, then filter, and add zinc powder to the filtrate (3.75g / kg secondary zinc oxide), control the temperature of the reaction solution at 40°C, replace for 1h, and filter to obtain a zinc ion concentration of 1.538mol / L, and iron and manganese ion concentrations of 0.464 mg / L and 0.147mg / L, respectively. Zinc chloride solution with lead, copper, and cadmium ion concentrations of 0.361mg / L, 0.01...

Embodiment 2

[0018] Use secondary zinc oxide (the main component is ZnO, the grade is 82%) to react with hydrochloric acid, the volume ratio of concentrated hydrochloric acid to water V 浓酸 / V 水 1. The mass concentration of concentrated hydrochloric acid is 30%, the liquid-solid ratio is 4.5L / kg, the reaction temperature is 55°C, and the reaction time is 40min). Then filter the obtained solution, add NaClO solution (0.20g / kg secondary zinc oxide) to the filtrate, control the pH value to 4.5, react at a temperature of 40°C, react for 2h, age for 0.5h, then filter, and add zinc powder to the filtrate (4.10g / kg secondary zinc oxide), control the temperature of the reaction solution at 40°C, replace for 1h, and filter to obtain a zinc ion concentration of 1.503mol / L, and iron and manganese ion concentrations of 0.407 mg / L and 0.138mg / L, respectively. Zinc chloride solution with lead, copper, and cadmium ion concentrations of 0.348mg / L, 0.010mg / L, and 0.035mg / L. . Using sodium hydroxide as a ...

Embodiment 3

[0022] Use secondary zinc oxide (the main component is ZnO, the grade is 82%) to react with hydrochloric acid, the volume ratio of concentrated hydrochloric acid to water V 浓酸 / V 水 0.9, the mass concentration of concentrated hydrochloric acid is 40%, the liquid-solid ratio is 5L / kg, the reaction temperature is 70°C, and the reaction time is 80min. Then filter the obtained solution, add NaClO solution (0.21g / kg secondary zinc oxide) to the filtrate, control the pH value to 4.8, react at a temperature of 80°C, react for 2h, age for 0.5h, then filter, and add zinc powder to the filtrate (4.35g / kg secondary zinc oxide), control the temperature of the reaction solution at 40°C, replace for 1h, and filter to obtain a zinc ion concentration of 1.546mol / L, and iron and manganese ion concentrations of 0.397 mg / L and 0.131mg / L, respectively. Zinc chloride solution with lead, copper, and cadmium ion concentrations of 0.326mg / L, 0.010mg / L, and 0.035mg / L. Using sodium hydroxide as a prec...

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Abstract

The invention relates to a process for producing nano zinc oxide by using crude zinc oxide. The process comprises the procedures of leaching, purifying, precipitating and calcining; the leaching procedure comprises the steps of adopting the crude zinc oxide as a material, reacting with hydrochloric acid and producing a coarse zinc chloride solution; the purifying procedure comprises the steps of controlling the pH value properly of the coarse zinc chloride solution obtained in the leaching procedure, adding sodium hypochlorite to carry out primary oxidation for removing impurities, adding zinc powder to carry out secondary replacement for removing impurities and obtaining a refined zinc chlorine solution; and the precipitating procedure comprises the step of reacting the refined zinc chlorine solution obtained in the purifying procedure and a sodium hydroxide solution, producing zinc hydroxide slurry, and then filtering, washing and drying the slurry to obtain zinc hydroxide; calcining the zinc hydroxide obtained in the precipitating procedure to obtain active zinc oxide. The process had the advantages that comprehensive utilization and sustainable development of resources are realized and the economic, environmental and social benefits are good.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy and chemical industry, and in particular relates to a process for producing nanometer zinc oxide from secondary zinc oxide. Background technique [0002] my country is the world's largest producer of non-ferrous metals, and its output of lead and zinc ranks first in the world. At present, the main production method is pyrometallurgy. In the lead-zinc smelting process, a large amount of sub-zinc oxide waste residue will be produced. The proportion of sub-zinc oxide (mainly composed of ZnO, generally 45%~80%) in the waste residue It is quite large, contains a variety of precious metals, and has a great recycling value. Compared with secondary zinc oxide, nano-zinc oxide is a multifunctional new inorganic material, and its particle size is about 1-100 nanometers. In recent years, it has been found that it exhibits many peculiar properties in catalysis, optics, magnetism, mechanics, et...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02B82Y30/00
Inventor 汤长淸李晓乐杨继朋徐素鹏王保玉许银霞马春玉卢鑫朱喜霞张晓杰王爱菊刘改云
Owner JIYUAN VOCATIONAL & TECHN COLLEGE
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