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A kind of preparation method of high-purity alumina grinding ball

A high-purity alumina, alumina ball technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of poor grinding effect, poor wear resistance, low pulverization efficiency, etc., and achieve good volume stability. With the effect of chemical stability, high temperature mechanical strength and wear resistance, high grinding efficiency

Active Publication Date: 2017-05-31
晶鑫晶体(内蒙古)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A kind of jet mill crushing, high energy consumption, uneven distribution of crushing particle size, low crushing efficiency, and easy to be polluted
The other is crushed by a sand mill, which has high efficiency, low energy consumption, and uniform product particle size distribution. However, special grinding balls are required to ensure the purity and grinding effect. These grinding balls are expensive, resulting in greatly improved production costs.
[0003] Most of the existing alumina grinding balls are made of bauxite, roller powder, industrial alumina powder, high-temperature calcined alpha alumina powder and other materials. , drying, firing and other processes; the low-end alumina grinding balls have insufficient purity, poor wear resistance, insufficient hardness, high wear, and insufficient density, which affect the grinding efficiency, poor grinding effect, and high pollution. Pure alumina powder
The high-end alumina grinding balls, although the use effect is better, but because of the high production cost, the price is also expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) High-temperature calcined 5N alpha alumina powder as raw material, crushed by jet mill, take cloth bag powder with D50 of 1.5 μm, spray evenly into 10% pure water according to the weight of alumina powder, press into cake shape, and then oxidize The aluminum cake is crushed with a PP rod, and then passed through a 20-mesh nylon screen;

[0030] 2) Pour the high-purity alumina powder under the sieve into the coating machine and roll the ball to form it. When the material is rolled into a ball with a diameter of 1.5mm~2 mm, take out the ball on the sieve with a 12-mesh screen. , the small balls under the sieve continue to be formed in the coating machine until most of the high-purity alumina materials are rolled into small balls with a diameter of 1.5mm~2 mm;

[0031] 3) Pre-fire the formed pellets in a roller kiln. The sintering curve is as follows: from room temperature to 500°C for 240 minutes, then to 950°C for 240 minutes, and then to 1210°C for 120 minutes, and k...

Embodiment 2

[0035] 1) 5N alpha alumina powder is used as raw material, crushed by jet mill, take cloth bag powder with D50 of 1.5 μm, spray evenly into 11% pure water according to the weight of alumina powder, and press to form a cake shape, and then the alumina cake The material is crushed with a PP rod, and then passed through a 20-mesh nylon screen;

[0036] 2) Pour the high-purity alumina powder under the sieve into the coating machine and roll the ball to form it. When the material is rolled into a ball with a diameter of 1.5~2 mm, take out the ball on the sieve with a 12-mesh screen. The small balls under the sieve continue to be formed in the coating machine until most of the high-purity alumina materials are rolled into small balls with a diameter of 1.5~2 mm;

[0037]3) Pre-fire the formed pellets in a roller kiln. The sintering curve is as follows: from room temperature to 510°C for 245 minutes, then to 945°C for 235 minutes, then to 1212°C for 125 minutes, and keep warm at 1212...

Embodiment 3

[0041] 1) High-temperature calcined 5N alpha alumina powder as raw material, crushed by jet mill, take cloth bag powder with D50 of 1.5 μm, spray evenly into 9% pure water according to the weight of alumina powder, press into cake shape, and then oxidize The aluminum cake is crushed with a PP rod, and then passed through a 20-mesh nylon screen;

[0042] 2) Pour the high-purity alumina powder under the sieve into the coating machine and roll the ball to form it. When the material is rolled into a ball with a diameter of 1.5~2 mm, take out the ball on the sieve with a 12-mesh screen. The small balls under the sieve continue to be formed in the coating machine until most of the high-purity alumina materials are rolled into small balls with a diameter of 1.5~2 mm;

[0043] 3) The formed pellets are pre-fired in a roller kiln. The sintering curve is as follows: from room temperature to 480°C for 230 minutes, then to 940°C for 230 minutes, and then to 1205°C for 110 minutes, and kee...

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Abstract

A high-purity alumina grinding ball production method belongs to the technical field of aluminum hydroxide crushing, and characterized by comprising the following preparation steps: an alumina powder raw material is sprayed with pure water, and pressed into an alumina cake material, the alumina cake material is crushed and then sieved through a 20 mesh sieve, the sieved alumina powder is poured into a coating machine, and rolled into alumina balls with the diameter of 1.5mm ~ 2 mm; the formed alumina balls are presintered, and then secondly sintered; and the secondly sintered alumina balls are sieved through a 24 mesh sieve to obtain high-purity alumina grinding balls. The sintering curve is as follows: the temperature is risen continuously to 1240 DEG C ~ 1260 DEG C from room temperature, then continuously risen to 1765 DEG C ~ 1775 DEG C, and the temperature is kept at 1765 DEG C ~ 1775 DEG C for 100min ~ 120min. The high-purity alumina grinding balls can be prepared by use of a low production cost, can be used for grinding of sapphire special powder, and is non- pollution, good in wear resistance, large in density, high in ground speed, and good in effect.

Description

technical field [0001] The invention discloses a method for preparing high-purity alumina grinding balls, belonging to the technical field of aluminum hydroxide pulverization. Background technique [0002] There are two main types of existing high-purity alumina crushing technologies. A jet mill for crushing has high energy consumption, uneven particle size distribution, low crushing efficiency, and is easily polluted. The other is crushed by a sand mill, which has high efficiency, low energy consumption, and uniform product particle size distribution. However, special grinding balls are needed to ensure the purity and grinding effect. These grinding balls are expensive, resulting in greatly improved production costs. [0003] Most of the existing alumina grinding balls are made of bauxite, roller powder, industrial alumina powder, high-temperature calcined alpha alumina powder and other materials. , drying, firing and other processes; the low-end alumina grinding balls ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/622C09K3/14
Inventor 王武平宋道山张棋
Owner 晶鑫晶体(内蒙古)科技有限公司