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Production method of ceria powder polishing size

A production method and technology of cerium oxide, which is applied in the field of multi-layer roasting to produce cerium oxide powder polishing slurry, can solve the problems of weakened mechanical grinding force of cerium oxide, difficulty in exposing the fresh surface of particles, and reduction of lattice defects, etc., to achieve slurry Good suspension and stability, good product quality, and the effect of improving hardness

Active Publication Date: 2012-07-11
HENAN UNION ABRASIVES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the temperature is too low, the cerium oxide particles are soft, so that the mechanical grinding force of cerium oxide is weakened, and the polishing speed is low; when the calcination temperature exceeds a certain range, the polishing powder particles are too hard, and it is not easy to break when grinding, and it is not easy to expose the fresh surface of the particles. The orderly arrangement of the lattice is enhanced, the lattice defects are reduced, and the activity is reduced. It can only mechanically grind the glass surface, and the polishing rate will also decrease.

Method used

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  • Production method of ceria powder polishing size
  • Production method of ceria powder polishing size
  • Production method of ceria powder polishing size

Examples

Experimental program
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Effect test

Embodiment 1

[0018] (1) Add cerium hydroxide into the roasting furnace, gradually raise the temperature from room temperature to 1000°C for roasting, keep at this temperature for 2 hours, and obtain cerium oxide powder;

[0019] When heating up, proceed according to the following heating curve: from room temperature to 160°C over 0.1-0.3h, and keep at 160°C for 0.5h; after 0.2-0.5h to 500°C, keep at 500°C for 1.5h; To 750°C, keep at 750°C for 0.5h; then heat up from 750°C to 1000°C over 0.3-0.8h, keep at 1000°C for 2h; naturally cool from 1000°C to room temperature;

[0020] (2) Mix the obtained cerium oxide powder with nitric acid at a mass ratio of 1:3 to obtain a slurry with a pH of 3-5; put the slurry and metal balls with a diameter of 3-10mm into a ball mill, and grind for 15 hours roughly, and the ball mill speed 50-80r / min; adjust the pH of the slurry after coarse grinding to 3-5, use a metal ball with a diameter of 0.1-2mm to finely grind for 2 hours, and the speed of the ball mill...

Embodiment 2

[0022] (1) Add cerium hydroxide and cerium carbonate into the roasting furnace at a mass ratio of 1:2, gradually raise the temperature to 1000°C for roasting, keep at this temperature for 3 hours, and obtain cerium oxide powder;

[0023] The heating curve is as follows: from room temperature to 160°C for 0.1-0.3h, and hold for 0.5h; for 0.2-0.5h to 500°C, for 1h; After 0.3-0.8h, the temperature is raised to 1000°C, and the temperature is kept for 3h; naturally cooled from 1000°C to room temperature;

[0024] (2) Mix the obtained cerium oxide powder with sulfuric acid at a mass ratio of 1:2 to obtain a slurry with a pH of 3-5; add the slurry and metal balls with a diameter of 3-10 mm into a ball mill, and grind for 20 hours, and then The rotation speed is 50-80r / min; adjust the pH of the slurry after coarse grinding to 3-5, and then use metal balls with a diameter of 0.1-2mm to finely grind for 0.5-3h, the rotation speed of the ball mill is 2000-3000r / min, and finally get ceriu...

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Abstract

The invention relates to a production method of ceria powder polishing size. The production method comprises the steps that cerium hydroxide and / or cerium carbonate are added to a baking furnace, and the baking furnace is gradually heated up from room temperature to a temperature of 1000 DEG C to bake the cerium hydroxide and / or the cerium carbonate and then thermally-preserved for 2 to 4h; ceriapowder is mixed with acid according to a mass ratio of 1:1 to 3, and the size with a pH (potential of hydrogen) of 3 to 5 is obtained; and after the size is roughly ground for 10 to 20h and fine ground for 0.3 to 3h, the polishing size is obtained. The production method has the advantages that the ceria powder size is produced by adopting a multilevel temperature baking manner, so that the hardness of ceria can be increased, and the hardness and the surface activity of the ceria can simultaneously reach better states; through regulating the pH of the size, ceria particles have low probabilityof agglomeration, the suspension ability and the stability of the size are good, and dispersion agents do not need to be added, so that the influence of the dispersion agents on the stability of the size can be eliminated; the process is simplified; and the cost is reduced.

Description

technical field [0001] The invention belongs to the field of rare earth roasting metallurgy, in particular to a method for producing cerium oxide powder polishing slurry by multi-layer roasting. Background technique [0002] The chemical activity of cerium oxide refers to the ability of cerium oxide to remove surface substances of products through chemical or other related actions during the polishing process. The chemical activity of cerium oxide is mainly caused by its lattice defects. The polishing powder with many internal lattice defects has higher chemical activity. Therefore, some methods can be used to increase the lattice defects of the polishing powder to improve its polishing ability, such as calcination The rapid cooling of the polished material after quenching can cause more lattice disorder inside the crystal, the chemical activity of the crystal is improved, and the crystal does not continue to grow during rapid cooling, but cracks and causes structural defect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09G1/02
Inventor 茅云汪静闫胜利
Owner HENAN UNION ABRASIVES
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