Preparation method of cerium carbonate and cerium oxide

一种碳酸铈、氧化铈的技术，应用在碳酸盐/酸式碳酸盐的制备、氧化铈/氢氧化铈、稀土金属化合物的制备/处理等方向，能够解决存在危险性、收益率或生产率差、碳酸铈粒径均匀性不够充分等问题，达到高收益率、高生产率的效果

Active Publication Date: 2011-08-24
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, there is no real development of a preparation method that can simply adjust the type, shape or size of cerium carbonate, and the particle size uniformity of cerium carbonate obtained by the previous preparation method is not sufficient.
[0008] Moreover, the preparation method of cerium carbonate known in the past has the shortcoming of its poor yield or productivity, when wanting to obtain the cerium carbonate of specific crystal structure or shape such as hexagonal crystal, need carry out high-pressure reaction, therefore there is danger

Method used

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  • Preparation method of cerium carbonate and cerium oxide
  • Preparation method of cerium carbonate and cerium oxide
  • Preparation method of cerium carbonate and cerium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The shape and crystal structure of cerium carbonate were confirmed by electron micrographs and X-ray diffraction analysis, and the electron micrographs are shown in figure 1 .

[0071] like figure 1 As shown by the XRD analysis results of the cerium carbonate obtained in Example 1, the cerium carbonate in Example 1 has a uniform particle size and only contains cerium carbonate with a hexagonal crystal structure (100% by volume).

[0072] Example 2

Embodiment 2

[0074] The shape and crystal structure of cerium carbonate were confirmed by electron micrographs and X-ray diffraction analysis, and the electron micrographs are shown in figure 2 .

[0075] like figure 2 As shown, the cerium carbonate in Example 2 has a uniform particle size, and it can be seen from the X-ray diffraction spectrum that it only contains cerium carbonate with a hexagonal crystal structure (100% by volume).

[0076] Example 3

Embodiment 3

[0078] The shape and crystal structure of cerium carbonate were confirmed by electron micrographs and X-ray diffraction analysis, and the electron micrographs are shown in image 3 .

[0079] like image 3 As shown, the cerium carbonate in Example 3 has a uniform particle size, and it can be seen from the X-ray diffraction spectrum that it only contains cerium carbonate with a hexagonal crystal structure (100% by volume).

[0080] Example 4

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Abstract

The invention relates to a preparation method of cerium carbonate, cerium carbonate and a preparation method of cerium oxide by utilizing the cerium carbonate, wherein the earning rate or productivity of cerium carbonate is improved and cerium carbonate of uniform articles is prepared. According to the preparation method of cerium carbonate, cerium precursor and urea are mixed. Then the temperature of the mixture is increased to more than 50 DEG C without any other reaction medium. With the presence of macromolecular dispersant, cerium precursor reacts with urea.

Description

technical field [0001] The invention relates to a preparation method of cerium carbonate and a preparation method of cerium oxide. Specifically, the present invention relates to a method for preparing cerium carbonate, a method for preparing cerium carbonate and cerium oxide, which can improve the yield or productivity of cerium carbonate, and can prepare cerium carbonate with uniform particle size. Background technique [0002] Cerium oxide is a high-performance ceramic material widely used in catalysts, phosphors, cosmetics, and abrasive materials. Recently, especially in the field of semiconductor devices, it has attracted attention as an abrasive material in chemical and mechanical polishing (CMP: Chemical Mechanical Polishing) processes. [0003] Such cerium oxide can generally be prepared by a liquid-phase method, a gas-phase method or a solid-phase method. [0004] The liquid-phase method is a method of preparing cerium oxide from a metal salt by adding a pH adjuster...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00C01B32/60C01F17/235C01F17/247
CPCC01F17/0043C01F17/005C01P2004/64C01P2004/03B82Y30/00Y10T428/2982C01F17/247C01F17/235C01F17/10
Inventor 赵俊衍崔相洵曹升范
Owner LG CHEM LTD
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