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Method for preparing basic cerium carbonate with high rare earth content

A high rare earth content, cerium carbonate technology, applied in rare earth metal carbonates, rare earth metal compounds, chemical instruments and methods, etc., can solve the problems of inability to realize industrialized production, inability to quickly add precipitants, low production efficiency, etc. The effect of reducing pure water consumption, reducing energy consumption and improving production efficiency

Inactive Publication Date: 2018-05-01
包头科日稀土材料有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The preparation of basic cerium carbonate by hydrothermal method has the disadvantages of high energy consumption, complex process and low production efficiency.
In addition, there is also a method for preparing basic cerium carbonate by using ammonium bicarbonate. In this method, there are too many foams in the reaction process, and the precipitant cannot be added quickly, and the production efficiency is low, and industrial production cannot be realized.

Method used

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  • Method for preparing basic cerium carbonate with high rare earth content

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Effect test

Embodiment 1

[0015] Embodiment 1: mixed precipitant is the mixed solution of ammoniacal liquor and ammonium bicarbonate, and the mol ratio of ammoniacal liquor and ammonium bicarbonate is 1.38:1, and mixed precipitant temperature is 30 ℃, and total alkalinity is 3mol / L, takes this mixed precipitant Precipitating agent 736L. Pour cerium nitrate solution with a concentration of 1.0mol / L, pH=6.0, and a volume of 640L into a 3000L enamel reaction pot, turn on the reaction pot to stir, and heat to 90°C. Add the mixed precipitant according to the flow rate of 18.4L / min. During the reaction process, keep the reaction temperature at 90°C, and the feeding time is 40min. The amount of the mixed precipitant is 115% of the theoretical amount. The pH of the mother liquor end point is 7.4. Stop heating and continue stirring After 30 minutes, let it cool down to 40°C. Spin dry with a centrifuge, and rinse the precipitate with pure water at 30°C and a volume of 550 L to obtain basic cerium carbonate. Ba...

Embodiment 2

[0016] Embodiment 2: mixed precipitant is the mixed solution of ammoniacal liquor and ammonium bicarbonate, and the mol ratio of ammoniacal liquor and ammonium bicarbonate is 1.40:1, and mixed precipitant temperature is 25 ℃, and total alkalinity is 3.mol / L, takes The mixed precipitant 704L. Pour cerium nitrate solution with a concentration of 1.0mol / L, pH=6.0, and a volume of 640L into a 3000L enamel reaction pot, turn on the reaction pot to stir, and heat to 80°C. Add the mixed precipitant according to the flow rate of 17.6L / min. During the reaction process, keep the reaction temperature at 80°C, and the feeding time is 40min. The amount of the mixed precipitant is 110% of the theoretical amount. The pH of the mother liquor end point is 7.2. Stop heating and continue stirring After 30 minutes, let it cool down to 40°C. Spin dry with a centrifuge, and rinse the precipitate with pure water at 30°C and a volume of 550 L to obtain basic cerium carbonate. Basic cerium carbonate...

Embodiment 3

[0017] Embodiment 3: mixed precipitant is the mixed solution of ammoniacal liquor and ammonium bicarbonate, and the mol ratio of ammoniacal liquor and ammonium bicarbonate is 1.38:1, and mixed precipitant temperature is 25 ℃, and total alkalinity is 4mol / L, takes this mixed precipitant Precipitating agent 528L. Pour cerium nitrate solution with a concentration of 0.75mol / L, pH=6.0, and a volume of 853L into a 3000L enamel reaction pot, turn on the reaction pot to stir, and heat to 70°C. Add the mixed precipitant according to the flow rate of 10.6L / min. During the reaction process, keep the reaction temperature at 70°C, and the feeding time is 50min. The amount of the mixed precipitant is 110% of the theoretical amount. The pH of the mother liquor at the end point is 7.2. Stop heating and continue stirring After 30 minutes, let it cool down to 40°C. Spin dry with a centrifuge, and rinse the precipitate with pure water at 30°C and a volume of 550 L to obtain basic cerium carbon...

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Abstract

The invention discloses a method for preparing basic cerium carbonate with high rare earth content. A mixed precipitator is taken as a cerium ion precipitator, a cerium nitrate solution is taken as areaction tank base solution, a positive charging precipitation way is adopted, precipitation reaction is carried out in a reaction tank, reaction temperature and pH value of destination mother liquorin the reaction tank are controlled, so that cerium ions are completely precipitated, and cooling, centrifuging and eluting are carried out, so that the basic cerium carbonate is obtained. The methoddisclosed by the invention has the advantages that a mixed solution of ammonia water and ammonium bicarbonate is adopted as the cerium ion precipitator, the positive charging precipitation way is adopted, the cerium ion precipitator can be quickly added into a reaction base solution, foam is hardly produced in a reaction process, production efficiency is greatly increased, and large-scale production can be realized.

Description

Technical field: [0001] The invention relates to a method for preparing basic cerium carbonate, in particular to a method for preparing basic cerium carbonate with high rare earth content. Background technique: [0002] With the development of China's rare earth industry, the market demand for rare earth products with special physical properties is increasing. Due to its special properties, basic cerium carbonate has a wide range of applications. Mainly used in glass industry, polishing materials, luminous materials, red pigments, etc. [0003] At present, the preparation of basic cerium carbonate with high total rare earth content mainly adopts hydrothermal method, using cerium nitrate as cerium source and urea as carbon source at high temperature above 120°C. The preparation of basic cerium carbonate by hydrothermal method has the disadvantages of high energy consumption, complicated process and low production efficiency. In addition, there is also a method for preparin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
CPCC01F17/247C01P2004/51C01P2006/80
Inventor 卢国贞鲁强
Owner 包头科日稀土材料有限公司
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