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Method for preparing nano ZnO by virtue of metallurgy

A metallurgical method and nanotechnology, applied in the field of metallurgical preparation of nano-ZnO, can solve the problems of demanding process conditions, complicated preparation process, high preparation cost, etc., and achieve the effect of high purity, simple equipment and low cost

Inactive Publication Date: 2013-02-06
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of these methods is complex, the process conditions are harsh, and the preparation cost is high, causing environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) The zinc ore is fed with hydrogen at 700°C for reaction, so that the hydrogen reduces the zinc ore to form zinc liquid;

[0017] (2) Evaporate the zinc liquid formed in step (1) into zinc vapor at 950°C;

[0018] (3) Pass water vapor at 200°C into the zinc vapor in step (2) at a flow rate of 1g / min, and react with the zinc vapor to generate ZnO powder and hydrogen;

[0019] (4) Collect the ZnO powder and hydrogen gas obtained in step (3), and conduct gas-solid separation after cooling and cooling in a heat exchanger to obtain nano-ZnO and hydrogen gas; the hydrogen gas obtained is returned to step (1) for recycling.

Embodiment 2

[0021] (1) The zinc ore is fed with hydrogen at 800°C for reaction, so that the hydrogen reduces the zinc ore to form zinc liquid;

[0022] (2) Evaporate the zinc liquid formed in step (1) into zinc vapor at 1000°C;

[0023] (3) Pass 400°C water vapor into the zinc vapor in step (2) at a flow rate of 4g / min, and react with the zinc vapor to generate ZnO powder and hydrogen;

[0024] (4) Collect the ZnO powder and hydrogen gas obtained in step (3), and conduct gas-solid separation after cooling and cooling in a heat exchanger to obtain nano-ZnO and hydrogen gas; the hydrogen gas obtained is returned to step (1) for recycling.

Embodiment 3

[0026] (1) The zinc ore is fed with hydrogen at 900°C for reaction, so that the hydrogen reduces the zinc ore to form zinc liquid;

[0027] (2) Evaporate the zinc liquid formed in step (1) into zinc vapor at 1100°C;

[0028] (3) Pass water vapor at 100-600°C into the zinc vapor in step (2) at a flow rate of 6g / min, and react with the zinc vapor to generate ZnO powder and hydrogen;

[0029] (4) Collect the ZnO powder and hydrogen gas obtained in step (3), and conduct gas-solid separation after cooling and cooling in a heat exchanger to obtain nano-ZnO and hydrogen gas; the hydrogen gas obtained is returned to step (1) for recycling.

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Abstract

The invention provides a method for preparing nano ZnO by virtue of metallurgy. The method comprises the following steps of: reducing zinc ores by adopting hydrogen to form a zinc liquid, evaporating the zinc liquid at high temperature, and then introducing water vapor for reaction to form ZnO powder and hydrogen which is recycled. According to the method, not only can nano ZnO with good quality be prepared, but also the hydrogen can be generated and recycled. The ZnO powder prepared by the method is high in purity and uniform in particle size; and the cost of the whole method is low, the use equipment is simple, the industrial production is easy, and the method is a novel and high-efficiency technology for preparing the nano ZnO powder and recycling the hydrogen.

Description

technical field [0001] The invention relates to a method for preparing nanometer ZnO by a metallurgical method, which belongs to the technical field of energy and materials. Background technique [0002] In the research of nano-materials, nano-zinc oxide is a new type of multi-functional, multi-purpose, high-performance fine chemical product developed in recent years. It plays the role of an irreplaceable means of production in many occasions. The market demand Also grows accordingly. Zinc oxide powder is widely used in various industries, especially nano-scale zinc oxide powder due to its small size and large specific surface area, showing surface effect, volume effect, quantum tunneling effect, non-migratory, fluorescent, light absorption and the ability to scatter ultraviolet light. Therefore, zinc oxide powder can be used to prepare varistors, varistors, magnetic materials, phosphors, ultraviolet shielding materials, gas sensors, image recording materials, advanced coa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/03C01B3/10
CPCY02E60/36
Inventor 李孔斋刘自松王华魏永刚祝星杜云鹏吴冬冬宁培洪郑燕娥
Owner KUNMING UNIV OF SCI & TECH
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