Method for producing alpha-aluminum oxide by utilizing gas-suspension roasting furnace

A technology of gas suspension and roasting furnace, which is applied in the preparation of alumina/hydroxide, etc., can solve the problems of long cycle time and high energy consumption, and achieve the effects of good fluidity of finished products, strong homogenization ability of finished products, and large production capacity

Inactive Publication Date: 2014-05-07
ZHENGZHOU JINYANGGUAN CERAMICS CO LTD
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Problems solved by technology

[0008] The invention provides a method for producing α-alumina by using a gas suspension roasting furnace, which solves the problems of high energy consumption and long cycle when the existing kiln produces α-alumina

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  • Method for producing alpha-aluminum oxide by utilizing gas-suspension roasting furnace
  • Method for producing alpha-aluminum oxide by utilizing gas-suspension roasting furnace

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[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0033] Such as figure 1 As shown, a method for producing α-alumina using a gas suspension roaster, adding a mineralizer quantitative feeder A03 between the cyclone preheater P01 and the thermal separation cyclone P03 of the gas suspension roaster, the described The outlets of the mineralizer quantitative feeder A03 are respectively connected to the pipeline between the cyclone preheater P01 and the thermal separation cyclone P03 and the pipeline between the cyclone...

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Abstract

The invention relates to a method for producing alpha-aluminum oxide by utilizing a gas-suspension roasting furnace. A quantitative mineralizing-agent discharging device is added between a cyclone preheater and a thermal-separation cyclone drum of the gas-suspension roasting furnace; and an electric dust collector is provided with a collecting device of dust and enriched particles. The production method comprises the following steps of: (1) feeding of aluminum hydroxide; (2) drying; (3) preheating; (4) roasting and separation; (5) primary cooling; (6) secondary cooling; (7) dust removal and ash return. The produced alpha-aluminum oxide comprises the following chemical components in percentage by weight: 99.2%-99.7% of Al2O3, 0.1-0.35% of Na2O, 0.02-0.05% of SiO2 and 0.01-0.03% of Fe2O3; and the physical properties are as follows: alpha-Al2O3 is 89-95%, the true density is 3.89-3.97g / cm<3> and the loss on ignition is 0.08-0.13%.

Description

technical field [0001] The invention relates to a production method of α-alumina, in particular to a method for producing α-alumina by using a gas suspension roasting furnace. Background technique [0002] α-alumina, also sintered corundum, in the state of white fluffy powder, the crystal form is α-type, the original grain size is 0.5 microns; the specific surface area is ≥35m 3 / g. Uniform particle size distribution, high purity and high dispersion. It has a low specific surface area and high temperature resistant inertness, but it does not belong to activated alumina and has almost no catalytic activity; it has strong heat resistance, good formability, stable crystal phase, high hardness and good dimensional stability, and can be widely used in various Reinforcement and toughening of plastics, rubber, ceramics, refractory materials and other products, especially improving the compactness, smoothness, cold and heat fatigue resistance, fracture toughness, creep resistance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/30
Inventor 马斌孔令明周彬吕振林马楸阳
Owner ZHENGZHOU JINYANGGUAN CERAMICS CO LTD
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