White alundum hyperfine abrasive micropowder preparation method

A production method and ultra-fine technology are applied in the field of preparation of alumina micropowder to achieve the effect of improving precision

Inactive Publication Date: 2011-04-06
ZIBO JINJIYUAN ABRASIVES
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Problems solved by technology

[0003] In order to overcome the shortcomings of traditional micropowder production where particles of different particle sizes are agglomerated during hydraulic classification to make the particle size distribution of the same batch of micropowder wide, the present invention proposes a new classification process of adding dispersant by hydraulic sedimentation method

Method used

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Embodiment Construction

[0011] Below in conjunction with embodiment the specific embodiment of the present invention is described in detail as follows:

[0012] 1. Prepare the raw material, which is white corundum powder with a particle size below 40 microns after calcination and pulverization;

[0013] 2. Build a barrel-shaped sedimentation tank with a height of 2 meters and a diameter of 1.5 meters. The glass fiber reinforced plastic coated on the inner wall of the tank is 1 cm thick, and a mixer is installed in the tank;

[0014] 3. Put the slurry with a concentration of 500 g / liter after pickling in the pickling workshop into the sedimentation tank, from the water surface to 15 cm below the mouth of the pool, add a dispersant of 5 / 10,000 of the weight of the solid material in the slurry, and stir for 1 hour. Then let it stand and settle to stabilize the slurry surface. After 4 hours, discharge the slurry of 25 cm in the upper layer with a siphon, then add clear water to 15 cm below the mouth of t...

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Abstract

A white alundum hyperfine abrasive micropowder preparation method adopts aluminum hydroxide as raw material to perform calcining, crushing, pickling, grading and drying so as to obtain the finished product; in regard to micropowder with a particle size of less than 40 microns; hydraulic sedimentation method is used for grading, the grading is performed from thin grades to thick grades in turn, and first thin grades are divided and then thick grades are divided until the whole grades are divided. The grading method of the invention strictly controls the slurry concentration, the settling time and the siphon height and adds high effective dispersant at the same time; the dispersant molecules are penetrated among agglomerated particles in water and coated around all the particles in different sizes, and owning to the repulsion of molecular electric charges of the dispersant, the particles can not be agglomerated together so that the accuracy of grading is increases and the finished product can maintain loose state.

Description

【Technical field】 [0001] The invention relates to the preparation of alumina micropowder, that is, the production method of white corundum superfine grinding micropowder. 【Background technique】 [0002] White corundum micropowder, the main chemical composition is aluminum oxide, is an ideal grinding material, white in color, Mohs hardness is 9, microhardness (HV) 2200-2300 kg / mm2, with the development of high technology , has more and more extensive uses, such as the production of computer chips, the production of silicon wafer components of electronic communication products, the manufacture of rocket engine heat-resistant components, the manufacture of high-temperature gas turbine blades, etc., all require a large amount of high-quality white corundum powder, Higher requirements are put forward for the quality of white corundum micropowder, which requires narrow particle size distribution, flat particle shape, and no large particles. During production, due to the small part...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/30
Inventor 丁瑞成丁建平
Owner ZIBO JINJIYUAN ABRASIVES
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