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Preparation method of aluminum oxide microbeads

A technology of alumina and alumina powder, which is applied in the field of ceramic materials, can solve the problems of inability to achieve fine-grained structure of alumina microbeads, secondary recrystallization growth of alumina grains, and high production costs, so as to avoid sticking Problems of junction and collision deformation, small primary grain size, and high production efficiency

Active Publication Date: 2014-11-19
JINGANG NEW MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the high α-phase conversion rate in the alumina powder used, the fineness of the aluminum powder is relatively coarse, and it is difficult to ball mill; the high firing temperature will cause the secondary recrystallization of alumina grains to grow abnormally, which cannot be achieved. Alumina microbeads have a fine crystallized structure, so they are not suitable as alumina microbeads (diameter ≤ 5mm), and the production cost is high

Method used

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  • Preparation method of aluminum oxide microbeads
  • Preparation method of aluminum oxide microbeads
  • Preparation method of aluminum oxide microbeads

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Raw materials and parts by weight

[0036] Main ingredients: 92 parts of alumina powder, 5 parts of kaolin;

[0037] Composite sintering aids: 0.5 parts of diopside, 0.5 parts of talc, 2 parts of silica powder;

[0038](2) Put the alumina powder, kaolin and composite sintering aids into the batch ball mill for ball milling respectively, control the water content at 45-48%, and the ball milling time is 32 hours. Material: ball: water = 1:2:1, slurry Fineness D90=5.4μm, pass through a 180 mesh sieve and put it into the transfer slurry tank, then use a slurry pump to pump the slurry into the vertical sand mill for ball milling, the spindle speed is 1400r / min, the production capacity is 0.8T / h, slurry: ball = 1 : 4, slurry fineness D90=3.2μm, through 180 mesh sieve, get ceramic slurry after electromagnetic iron removal;

[0039] (3) The ceramic slurry obtained in step (2) is dried into ceramic granulation powder using a centrifugal spray granulation tower, the tempera...

Embodiment 2

[0043] (1) Raw materials and parts by weight

[0044] Main ingredients: 90 parts of alumina powder, 7 parts of kaolin;

[0045] Composite sintering aids: 1.5 parts of diopside, 0.5 parts of talc, 1 part of silica powder;

[0046] (2) Put the alumina powder, kaolin, silica powder and composite sintering aid into the batch ball mill for ball milling, the water content is controlled at 47-50%, the ball milling time is 34 hours, material: ball: water = 1:3:1 , the slurry fineness D90=6.6μm, pass through a 180 mesh sieve and put it into the transfer slurry pool, then use the slurry pump to pump the slurry into the vertical sand mill for ball milling, the spindle speed is 1430r / min, the production capacity is 0.7T / h, the slurry: Ball = 1:4, slurry fineness D90 = 3.2μm, pass through a 180 mesh sieve, and obtain ceramic slurry after electromagnetic iron removal;

[0047] (3) The ceramic slurry obtained in step (2) is dried into ceramic granulation powder by adopting a centrifugal sp...

Embodiment 3

[0051] (1) Raw materials and parts by weight

[0052] Main ingredients: 88 parts of self-burning alumina powder, 9 parts of kaolin;

[0053] Composite sintering aid: 1 part of diopside, 1 part of talc, 1 part of silica powder;

[0054] (2) Put the self-burning alumina powder, kaolin, silicon micropowder and composite sintering aid into the batch ball mill for ball milling respectively, the water content is controlled at 50-53%, the ball milling time is 30 hours, material: ball: water = 1: 2.8 : 1. Slurry fineness D90=6.9μm, passed through a 180-mesh sieve and put into the transfer slurry pool, pumped the slurry into the vertical sand mill for ball milling with a slurry pump, the spindle speed was 1440r / min, and the production capacity was 1.1T / h. Slurry: ball = 1:4, slurry fineness D90 = 3.1μm, pass through a 180 mesh sieve, and obtain ceramic slurry after electromagnetic iron removal.

[0055] (3) The ceramic slurry obtained in step (2) is dried into ceramic granulation pow...

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Abstract

The invention discloses a preparation method of aluminum oxide microbeads. The preparation method comprises the following steps: by adopting aluminum oxide powder with lower alpha phase conversion rate (80-90%) as a main raw material, adding a composite sintering additive, ball-milling through an intermittent ball mill and a vertical sand mill, and then performing centrifugal type spray pelletization, rolling to forming, drying, sintering in a rotary kiln, and continuous grinding and polishing, to obtain the aluminum oxide microbeads. According to the preparation method, the aluminum oxide powder with relatively low alpha phase conversion rate is adopted, activity of the remaining gamma-aluminum oxide phase in the aluminum oxide powder promotes the sintering of the aluminum oxide, the addition amount of the sintering additive is decreased, and meanwhile the problem that the aluminum oxide microbeads during the sintering of the rotary kiln are caked and collided to be deformed due to excessive glass phase can be solved. Rotary kiln sintering equipment is introduced, the microbeads are under a moving status during the sintering of the rotary kiln, and are evenly heated during sintering, thus being uniform in the structure and performances. The prepared aluminum oxide microbeads have the characteristics of being low in abrasion, high in strength and density, uniform in particle size, free from breakage of beads, and the like.

Description

technical field [0001] The invention relates to a method for preparing alumina microbeads as a grinding medium, and belongs to the technical field of ceramic materials. Background technique [0002] Grinding equipment has developed from agitating ball mills using larger particle size grinding balls to vertical sand mills using small particle size grinding beads, horizontal sand mills, and new types of sand mills that can perform ultra-fine grinding with various performance improvements. Machine, the particle size of the grinding media used is getting smaller and smaller. Since the material in the grinder is ground through contact with the moving grinding medium for shearing, collision and grinding, the smaller the particle size of the grinding medium, the more contact points per unit volume of the material, thus obtaining higher High grinding efficiency and small grinding fineness. [0003] Common grinding beads have a diameter of less than 5 mm. Divided by material: glas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C09K3/14
Inventor 赵友谊王瑞生王琦王晋槐马晓兵刘菲菲
Owner JINGANG NEW MATERIALS
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