Production process of aluminum oxide hollow microspheres
A technology of hollow microspheres and production technology, applied in the fields of alumina/hydroxide, inorganic chemistry, aluminum compounds, etc., can solve problems such as unstable product quality, difficulty in meeting gas phase product requirements, large primary particles, etc.
Active Publication Date: 2022-01-04
南通京创桐元新材料有限公司
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Problems solved by technology
[0003]
When the precipitation method and chemical vapor phase method are used to prepare nano-alumina, the process is a chemical reaction, and the post-processing of the process technology is responsible, and the product quality is unstable. However, the grinding method can obtain large primary particles, which is difficult to meet the requirements of gas phase products.
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[0037] A production process of aluminum oxide hollow microspheres, comprising the following steps:
[0038] S1. After the alumina powder is pre-crushed and mixed by nitrogen gas through the jet mill module 1, it is sent into the electrode room by the powder conveyor. The pre-crushed particle size must be less than 5 microns, and the gas-solid ratio must be greater than 50%;
[0039] S2. By adjusting the voltage device of the controller, the alumina forms an ionic fluid in the ionic state processing module 2;
[0040] S3, by controlling the outlet temperature of the air cooling module 3 of the air cooling module, adjusting the flow rate of the air, and cooling the ionic fluid;
[0041] S4. The cooled alumina powder passes through the finished product collection module 4 to complete the powder collection.
[0042] see figure 1 and figure 2 , the ion state processing module 2 in S1 includes an electrode housing 5, an electrode chamber 6 is dug in the electrode housing 5, a fe...
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Abstract
The invention discloses a production process of aluminum oxide hollow microspheres, and belongs to the technical field of aluminum oxide hollow microspheres. According to the scheme, activated aluminum oxide powder is fed into an ionic state treatment module together with nitrogen and then enters an electrode shell through a feeder; the aluminum oxide powder and the nitrogen are heated to form ion flow by controlling the voltage in an electrode chamber, preliminary processing of the aluminum oxide powder and the nitrogen is completed, later-stage processing is facilitated, after the aluminum oxide powder and the nitrogen are subjected to preliminary heating treatment to form the ion flow, the ion flow is sucked into a Venturi jet flow cooler through a suction inlet, high-pressure air passing through a high-pressure air inlet is compressed and cooled, and finally a nanoscale powder material with spherical particles, closed pores, the particle size smaller than 100 nm and positive charge accumulation on the surface is formed.
Description
technical field [0001] The invention relates to the technical field of alumina hollow microspheres, and more specifically, relates to a production process of alumina hollow microspheres. Background technique [0002] Alumina hollow spheres are a new type of high-temperature heat-insulating material. It is melted and blown from industrial alumina in an electric furnace. The crystal form is a-Al2O3 microcrystals. The main body is aluminum oxide hollow spheres. It can be formed into products of various shapes, the maximum service temperature is 1800°C, the mechanical strength of the products is high, which is several times that of general light products, and the volume density is only half of that of corundum products. [0003] When the precipitation method and chemical vapor phase method are used to prepare nano-alumina, the process is a chemical reaction, and the post-processing of the process technology is responsible, and the product quality is unstable. However, the grindi...
Claims
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IPC IPC(8): C01F7/02B82Y40/00
CPCC01F7/021B82Y40/00C01P2004/34
Inventor 仲从萍
Owner 南通京创桐元新材料有限公司