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Method for preparing large-particle cerium oxide

A cerium oxide, large particle technology, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve the problem of high production cost, achieve uniform particle distribution, good dispersibility, and easy control of the preparation process.

Inactive Publication Date: 2012-06-20
BAOTOU JINGRUI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method needs to dissolve cerium carbonate with nitric acid, and use cerium nitrate solution as raw material to prepare large particle cerium oxide, and the production cost is high.

Method used

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  • Method for preparing large-particle cerium oxide
  • Method for preparing large-particle cerium oxide
  • Method for preparing large-particle cerium oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0012] Add 1000L of cerium chloride solution with a concentration of 0.23mol / L into the FK3000 enamel reaction tank, heat the cerium chloride solution to 93°C, add 300L of ammonium bicarbonate solution with a concentration of 2.5mol / L, and the precipitation reaction is completed in 3 hours. After melting for 1 hour, washing and filtering, the cerium oxycarbonate precipitate was obtained, and the cerium oxycarbonate was kept in a firing kiln at 600° C. for 4 hours to obtain a cerium oxide product with a central particle size of 41.73 μm.

Embodiment 2

[0014] Add 1000L of cerium chloride solution with a concentration of 0.35mol / L into the FK3000 enamel reaction tank, heat the cerium chloride solution to 93°C, add 450L of ammonium bicarbonate solution with a concentration of 2.5mol / L, and complete the precipitation reaction for 3 hours. After melting for 1 hour, washing and filtering, the cerium oxycarbonate precipitate was obtained, and the cerium oxycarbonate was kept in a firing kiln at 500° C. for 4 hours to obtain a cerium oxide product with a central particle size of 38.46 μm.

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Abstract

The invention relates to a method for preparing large-particle cerium oxide, belonging to a preparation process for material. The method for preparing large-particle cerium oxide disclosed by the invention comprises the following steps of: preparing cerium oxycarbonate by using cerium chloride solution as a raw material and using ammonium bicarbonate as a precipitant, and then washing, filtering, centrifugally spin-drying and burning the cerium oxycarbonate precipitate, so as to obtain a cerium oxide product having a medium particle size of 35 to 45 microns. In the method for preparing large-particle cerium oxide disclosed by the invention, the precipitation temperature and concentration of the cerium oxycarbonate are the key, and cerium carbonate instead of cerium oxycarbonate is obtained when the precipitation temperature is lower than 85 DEG C; moreover, the preparation process is easy to control, and a large-particle cerium oxide product having a medium particle size of 35 to 45 microns is produced by the traditional cerium carbonate precipitation procedure of factory; and the large-particle cerium oxide product is uniform in particle distribution, good in dispersibility and spherical in shape.

Description

technical field [0001] The invention relates to a method for preparing large-particle cerium oxide, which belongs to a material preparation process. Background technique [0002] Large-grained cerium oxide is mainly used in industries such as special material polishing, glass decolorizer and clarifying agent. At present, the market demand for large-grained cerium oxide has increased significantly. CN200310118563.2 provides a kind of method of oxalic acid precipitation to prepare large grain cerium oxide, add ammonium nitrate in cerium nitrate solution, then prepare cerium oxalate with oxalic acid precipitation, obtain the cerium oxide that average particle size is 26.1 μ m after burning; It is reported that there are mainly two methods for the preparation of large particle cerium oxide. One method is to prepare cerium carbonate by precipitating cerium nitrate solution with ammonium bicarbonate, adding additives, and burning to obtain cerium oxide with an average particle siz...

Claims

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Application Information

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IPC IPC(8): C01F17/00B82Y40/00
Inventor 张瑞祥郝先库刘海旺王士智马显东斯琴毕力格许宗泽胡珊珊
Owner BAOTOU JINGRUI NEW MATERIAL
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