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Method for preparing rare earth polishing powder by recycling filtrate seed crystal

A technology of rare earth polishing powder and liquid crystal, which is applied to polishing compositions containing abrasives, etc., can solve the problems of unrecycled fluorinated rare earth carbonate, increased waste water discharge, and low overall product yield, etc., and achieves improved polishing ability. , Improve the utilization efficiency and enhance the effect of polishing performance

Active Publication Date: 2013-12-18
HUNAN HAOZHI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the claims of this patent, it is recorded that after the fluorination process, the F / REO in the rare earth carbonate is 0.5-30%, but from the perspective of the F content in the polishing materials completed in various examples, it is generally less than 3%, which shows that Low application rate of fluorine in the manufacturing process
At the same time, when using this process for fluorination, the slurry is mixed with pure water, which increases the amount of water; moreover, after hydrofluoric acid fluorination, when the fluorinated carbonate rare earth slurry is dried and filtered by a spin dryer, there is a small amount of fluorinated The filtrate of rare earth carbonate is discharged as waste liquid, which not only increases the amount of wastewater discharge, but also makes the fluorinated rare earth carbonate in the filtrate not recycled, and the overall yield of the product is low

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  • Method for preparing rare earth polishing powder by recycling filtrate seed crystal

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The technological process of the present embodiment is as follows:

[0023] ①. Slurry mixing: take 300kg of pure water, place it in a reaction kettle, add 300kg of lanthanum cerium carbonate, stir for 10 minutes, and prepare lanthanum cerium carbonate slurry for later use;

[0024] ②, fluorination: under the condition of stirring, at room temperature, 20kg of hydrofluoric acid with a concentration of 40% is added to the standby lanthanum cerium carbonate slurry within 10 minutes to carry out the fluorination reaction, and continue to stir for 20 minutes to become Lanthanum cerium carbonate fluoride slurry, standby;

[0025] 3. Filtration: Centrifuge the spare lanthanum cerium carbonate slurry for 5 minutes, collect the filtrate of lanthanum cerium fluoride carbonate and a small amount of cerium fluoride lanthanum carbonate seed crystals respectively for subsequent use; The aperture is 400 mesh;

[0026] ④. Burning and pulverizing: According to the conventional method,...

Embodiment 2

[0029] The technological process of the present embodiment is as follows:

[0030] ①, Slurry: Take 300kg of pure water, put it in a reaction kettle, add 97kg of lanthanum carbonate, 200kg of cerium carbonate and 3kg of praseodymium carbonate (total 300kg), stir for 30 minutes, and prepare lanthanum carbonate cerium praseodymium slurry material, spare;

[0031] ②. Fluorination: under stirring, at room temperature, add 16 kg of hydrofluoric acid with a concentration of 40% to the spare lanthanum cerium carbonate slurry within 10 minutes to carry out fluorination reaction, and continue stirring for 20 minutes. Become lanthanum cerium praseodymium fluoride carbonate slurry, standby;

[0032] ③. Filtration: The standby fluorinated lanthanum cerium carbonate slurry was centrifugally filtered for 5 minutes, and the filtrate with a small amount of fluorinated lanthanum cerium carbonate and the filtrate with a small amount of fluorinated lanthanum cerium carbonate seeds were collected...

Embodiment 3

[0036] The technological process of the present embodiment is as follows:

[0037] ①. Slurry: Take 500kg of pure water, put it in a reaction kettle, add 100kg of lanthanum carbonate and 400kg of cerium carbonate (500kg in total), stir for 30 minutes, and prepare a lanthanum carbonate slurry for later use;

[0038] ②, fluorination: under the condition of stirring, at room temperature, 35kg of hydrofluoric acid with a concentration of 40% was added to the standby lanthanum cerium carbonate slurry within 30 minutes to carry out the fluorination reaction, and continued to stir for 20 minutes to become Lanthanum cerium carbonate fluoride slurry, standby;

[0039] 3. Filtration: Centrifuge the standby lanthanum cerium carbonate slurry for 8 minutes, collect the filtrate with a small amount of lanthanum cerium fluoride carbonate seed crystals respectively for subsequent use; The aperture is 500 mesh;

[0040] ④. Burning and pulverizing: According to the conventional method, the cen...

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Abstract

The invention discloses a method for preparing rare earth polishing powder by recycling a filtrate seed crystal, and relates to the technical field of polishing material preparation. The technical process of the method comprises the following steps of size mixing, fluorating, filtering, firing, smashing and recycling. The method has the characteristics of being not only capable of improving the polishing performances of the polishing powder of the product, but also capable of improving the integral yield of the product, and being water-saving, environment-friendly and the like. The rear earth polishing powder prepared by applying the method disclosed by the invention is suitable for polishing of an LCD (Liquid Crystal Display), precision optical glass as well as jewelries and exterior wall glass.

Description

Technical field: [0001] The invention relates to the technical field of polishing material preparation, in particular to a method for preparing rare earth polishing powder by recycling filtered liquid crystal seeds. Background technique: [0002] In the prior art, the fluorination of rare earth carbonate with hydrofluoric acid is a common method for preparing rare earth polishing powder. The polishing powder prepared by this method is widely used in the polishing of LCD, precision optical glass, jewelry, and exterior wall glass. Patent application number (application number is 200410097548.9) "a preparation method of white cerium oxide". Obtain white cerium oxide with a true specific gravity of 6-8g / cm 3 , TREO≥85%, CeO2 / TREO≥90%Pr6O11 / TREO<1%, can be used as polishing material. In the claims of this patent, it is recorded that after the fluorination process, the F / REO in the rare earth carbonate is 0.5-30%, but from the perspective of the F content in the polishing mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09G1/02
Inventor 高利鸣巩强
Owner HUNAN HAOZHI TECH