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Method for preparing nano metal oxide powder

A nano-metal and oxide powder technology, applied in the chemical field, can solve the problems of insufficient powder purity, less agglomeration, and lack of liquid, etc., and achieve the effects of high-efficiency particle size distribution, increasing gasification ratio, and improving conversion rate

Inactive Publication Date: 2018-09-21
CHANGSHU INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is very easy to introduce impurities (such as some anions, etc.), resulting in insufficient purity of the powder.
At the same time, the production process often requires a large amount of acid and alkali to participate in the reaction, resulting in a large amount of waste water, which has a great impact on the environment
[0006] The gas phase method is a technology for preparing nano-powders that has been gradually developed and perfected in recent years. It is characterized by high powder purity, small particle size, less agglomeration, easy control of components, and lack of liquid. It requires special equipment and strict procedures. Reaction conditions, and strict requirements on raw materials, which brings certain difficulties to practical application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0031] Example 1, the preparation of nano gallium oxide

[0032] A certain mass of gallium metal is placed in a stone-ground crucible and heated to 100°C to completely melt the metal. Under the action of high-pressure argon gas (2MPa) and DC arc (80V), the liquid metal forms a highly dispersed plasma metal atomized gas flow, which is injected into the reactor containing high-purity air. The high-purity air flow rate is 2000m 3 / h, after passing through the grading powder collection system, superfine incompletely oxidized composite powder is obtained. The initial powder was heat-treated in an oxidizing atmosphere at 850°C for 3 hours to obtain nano-gallium oxide powder. Analysis and test show that the particle size distribution of gallium oxide powder is 20nm~40nm, and the specific surface area of ​​BET test is 30~50m 2 / g.

example 2

[0033] The preparation of example 2, nano bismuth oxide

[0034] A certain mass of metal bismuth is placed in a stone-ground crucible and heated to 300°C to completely melt the metal. Under the action of high-pressure nitrogen (5MPa) and DC arc (200V), the liquid metal forms a highly dispersed plasma metal atomized gas flow, which is injected into the reactor containing high-purity air. The high-purity air flow rate is 3500m 3 / h, after passing through the grading powder collection system, superfine incompletely oxidized composite powder is obtained. The initial powder was heat-treated in an oxidizing atmosphere at 350°C for 3 hours to obtain nano-bismuth oxide powder. Analysis and testing show that the particle size distribution of bismuth oxide powder is 35nm~80nm, and the specific surface area of ​​BET test is 15~40m 2 / g.

example 3

[0035] Example 3, the preparation of nano zinc oxide

[0036] Put a certain amount of metallic zinc in a stone-ground crucible and heat it to 450°C to completely melt the metal. Under the action of high-pressure nitrogen (9MPa) and AC arc (80V), the liquid metal forms a highly dispersed plasma metal atomized gas flow, which is injected into the reactor containing high-purity air. The high-purity air flow rate is 4000m 3 / h, after passing through the grading powder collection system, superfine incompletely oxidized composite powder is obtained. The initial powder was heat-treated in an oxidizing atmosphere at 300°C for 3 hours to obtain nano-zinc oxide powder. Analysis and testing show that the particle size distribution of zinc oxide powder is 20nm~50nm, and the specific surface area of ​​BET test is 25~50m 2 / g.

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Abstract

The invention discloses a method for preparing nano metal oxide powder. The method comprises the following steps: taking nitrogen gas or inert gas as protection gas or carrier gas; after atomizing high-purity metal liquid which is melted at high temperature, carrying out electric arc heating and then rapidly gasifying to form highly-dispersed plasma metal atomized airflow; then introducing the airflow into a low-temperature reactor containing high-purity air and carrying out oxidization reaction on the airflow and oxygen gas. The temperature of the whole airflow is suddenly reduced after the airflow enters the reactor, and the oxidization reaction is rapidly stopped; crystallization and growth of generated solid-phase oxide are prevented so that nanoparticles with a narrow granularity range are formed. After the nanoparticles are precipitated and collected through gravity, nano oxide powder with the purity greater than 99.9 percent can be obtained through heat temperature at specific temperature. The method disclosed by the invention not only can be used for preparing single metal oxide, but also can be used for preparing doped oxide. Furthermore, the method disclosed by the invention has the advantages of simple equipment technology, low cost and zero pollution and can be completely applied to industrialized large-batch production.

Description

technical field [0001] The invention relates to the field of chemical technology, in particular to a green and efficient method for preparing nanometer metal oxide powder. Background technique [0002] Nano metal oxide powder has its unique properties and is an important direction for the development of new materials. According to its different types and characteristics, it is mainly used in high-performance ceramics, medicine, optoelectronic materials, sensitive materials, high-efficiency catalysts, etc. Especially in recent years, the development of special ceramics and optoelectronic industries has opened up more opportunities for nano-metal oxide powders. Wide range of applications. [0003] The traditional preparation of nano metal oxide powder mainly includes solid-phase method, liquid-phase method, gas-phase method and so on. [0004] The solid-phase method has simple equipment and process, easy control of reaction conditions, high yield, low cost, and less pollutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/32C01F7/42C01G1/02C01G9/03C01G15/00C01G19/02C01G29/00B82Y30/00B82Y40/00
Inventor 王志成陈鹏苏建刚杨沛霖陶石张慧国钱斌冯金福
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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