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A kind of preparation method of low-sodium submicron calcined alumina

A sub-micron, alumina technology, applied in chemical instruments and methods, alumina/aluminum hydroxide, aluminum compounds, etc., can solve the problem of low sodium fine-grained alumina with high sodium oxide content, inability to use electronic ceramic substrates to produce raw materials, Affect product performance and other issues, and achieve the effect of uniform product grain, low production cost and high production efficiency

Active Publication Date: 2020-11-10
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-sodium fine-grained alumina prepared by this patent has a relatively high sodium oxide content and a relatively large primary grain size, which affects the performance of the product and cannot be used as raw materials for the production of electronic ceramic substrates, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In a 50 cubic meter stainless steel stirring tank, 30 tons of hot pure water with conductivity of 20μS / cm and temperature of 90 degrees was added, and 12 tons of BET specific surface area of 60m was added. 2 / g, industrial alumina with sodium oxide content of 0.39%, silicon oxide content of 0.01%, iron oxide content of 0.0057% and average particle size of 75 microns, adding a certain amount of industrial hydrochloric acid to adjust the initial pH value of the slurry to 5, adding 15 kg of ultra-fine water stone and 15 kg of light magnesium oxide, stirring for 4 hours, and then conveying the slurry to a vacuum belt filter for filtration and washing. A low-sodium alumina filter cake with sodium oxide content of 0.065% (wt%) was obtained. The alumina filter cake was sent to a rotary kiln by conveying equipment, and calcined in the rotary kiln at 1200℃ for 3 hours to obtain high-temperature alumina with α-phase conversion rate of 95.8%. The original grain size was about 0.7 micr...

Embodiment 2

[0026] In a 50 cubic meter stainless steel stirred tank, 30 cubic meters of hot pure water with conductivity of 20μS / cm and temperature of 60 degrees was added, and 6 tons of BET specific surface area of 80 meters was added. 2 / g, industrial alumina with sodium oxide content of 0.35%, silicon oxide content of 0.006%, iron oxide content of 0.0051% and average particle size of 85 microns, adding a certain amount of industrial hydrochloric acid to adjust the initial pH value of the slurry to 5.5, adding 4 kg of ultra-fine water stone, 4 kg of ultra-fine alumina and 4 kg of magnesium chloride, stirring for 3 hours, and then conveying the slurry to a vacuum belt filter for filtration and washing. A low-sodium alumina filter cake with sodium oxide content of 0.075% (wt%) was obtained. The alumina filter cake was sent to a rotary kiln by conveying equipment, and calcined at 1250℃ for 3 hours in the rotary kiln to obtain high-temperature alumina with α-phase conversion rate of 96.5%. Sub-...

Embodiment 3

[0028] In a 50 cubic meter stainless steel stirring tank, 30 cubic meters of pure water with conductivity of 20μS / cm and temperature of 30 degrees was added, and 20 tons of BET specific surface area of 80 meters was added. 2 / g, industrial alumina with sodium oxide content of 0.39%, silicon oxide content of 0.006%, iron oxide content of 0.0051% and average particle size of 85 microns, adding a certain amount of industrial sulfuric acid to adjust the initial pH value of the slurry to 5, adding 20 kilograms of ultra-fine water stone and 20 kilograms of magnesium carbonate, stirring for 1 hour, and then conveying the slurry to a vacuum belt filter for filtration and washing. A low-sodium alumina filter cake with sodium oxide content of 0.085% (wt%) was obtained. The alumina filter cake was sent to a rotary kiln by conveying equipment, and calcined at 1100℃ for 3 hours in the rotary kiln to obtain high-temperature alumina with α-phase conversion rate of 95.0%. The original grain size ...

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Abstract

The invention relates to a preparation method of low-sodium submicron alpha-alumina. The preparation method is characterized in that industrial alumina is used as a raw material in the preparation process. The industrial alumina is obtained by flash-roasting metallurgical-grade aluminium hydroxide produced by Bayer process at 1100-1300 DEG C through a suspension roaster. The principal crystallinephase is gamma phase; BET specific surface area is 60-100 m<2> / g; content of sodium oxide is less than 0.5 wt%; content of iron oxide is less than 0.015 wt%; and content of silica is less than 0.015 wt%. the preparation method comprises the following steps: blending industrial alumina with pure water and a crystalline form regulator to prepare slurry; carrying out wet impurity removal treatment toobtain wet alumina; and finally calcining to obtain a low-sodium submicron alpha-alumina product, and dispersing and dispersing through an agitator mill, a ceramic ball mill or a sand mill to obtainlow-sodium submicron alpha-alumina powder.

Description

Technical field [0001] The patent belongs to the field of inorganic nonmetallic materials, and relates to a preparation method of low-sodium submicron alpha-alumina used in the fields of electronic ceramics, lithium battery diaphragm materials, fine grinding and polishing, refractory materials and the like. technical background [0002] Low-sodium submicron alumina has many advantages, such as high hardness, wear resistance, corrosion resistance and good sintering activity. It is widely used in electronics, machinery, chemical industry, metallurgy, aerospace and other industries. Low-sodium submicron alumina is the main raw material for producing electronic ceramics, microcrystalline ceramics, foam ceramics, integrated circuit chips, lithium battery separators and fine polishing, etc. Its production and application technology has become a research hotspot. Low-sodium submicron alumina has high technical added value, but domestic special alumina producers can't produce it efficien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
CPCC01F7/021C01P2004/62C01P2006/80
Inventor 王建立樊大林宋为聪顾华李奉隆黄信建
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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