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Method for precipitating acid-soluble cerium-containing rare earth carbonate

A technology of rare earth carbonate and acid solubility, which is applied in the direction of improving process efficiency, etc., can solve the problems of poor acid solubility of cerium-containing rare earth carbonate, and achieve the effects of improving acid solubility, increasing acid solubility, and improving performance

Active Publication Date: 2016-06-22
淄博包钢灵芝稀土高科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, when preparing cerium-containing rare earth carbonate, there is no report on the poor acid solubility of cerium-containing rare earth carbonate, and there is no report on the feasible method of using ultrasonic degassing and vacuum degassing to solve this problem.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Get the cerium chloride feed liquid produced by Zibo Baotou Steel Ganoderma lucidum rare earth extraction workshop, and precipitate according to the following steps successively:

[0025] (1) In a 1000ml beaker, add 400mL of cerium chloride feed solution with a concentration of 1.35mol / L, dilute to 1000mL with pure water, and add a dissolved sodium carbonate solution with a concentration of 12% in another beaker. Ultrasonic degassing method is used for degassing, the ultrasonic frequency is 40kHz, and the degassing time is 40min.

[0026] (2) Slowly add the sodium carbonate solution into the cerium chloride feed solution at 30° C. with stirring until the pH of the supernatant is 7.

[0027] (3) The precipitate was centrifuged and rinsed for 15 minutes to obtain a cerium carbonate product.

[0028] The prepared cerium carbonate was dissolved in nitric acid, and its turbidity was measured to be 3.2NTU.

Embodiment 2

[0030] Get the cerium nitrate feed solution produced by Zibo Baotou Steel Ganoderma lucidum rare earth post-treatment workshop, and precipitate according to the following steps:

[0031] (1) Add 1000mL concentration in the suction filter bottle of 5000ml and be 0.45mol / L cerium nitrate stock solution, add the sodium carbonate solution that the concentration that dissolves is 10% in another suction filter bottle. Degassing is carried out by vacuum degassing, the vacuum degree is controlled at -60KPa, and degassing is performed for 15 minutes.

[0032] (2) Under the condition of stirring at 28°C, the sodium carbonate and the cerium nitrate feed liquid are controlled to co-flow and precipitate, and the pH value after the reaction is 6.8.

[0033] (3) The precipitate was centrifuged and rinsed for 10 minutes to obtain a cerium carbonate product.

[0034] The prepared cerium carbonate was dissolved in nitric acid, and its turbidity was measured as 0.9NTU.

Embodiment 3

[0036] Take the lanthanum cerium nitrate feed solution prepared by Zibo Baotou Steel Ganoderma lucidum rare earth research and development center, and precipitate according to the following steps:

[0037] (1) in the suction filter bottle of 5000ml, adding concentration is the 2000mL lanthanum cerium nitrate feed solution of 0.86mol / L, in another suction filter bottle, adding the concentration that dissolves is 12.5% ​​sodium carbonate and sodium bicarbonate mixed solution, Add 4000mL pure water to the third filter flask. Degassing is carried out by vacuum degassing, the vacuum degree is controlled at -1KPa, and degassing is performed for 20 minutes.

[0038] (2) Slowly add the mixed solution of sodium carbonate and sodium bicarbonate into the lanthanum cerium nitrate feed solution at 5° C. with stirring until the pH of the supernatant is 7.

[0039] (3) Centrifuge the precipitate, rinse it with degassed pure water for 15 minutes, and obtain the lanthanum cerium carbonate pro...

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Abstract

The invention belongs to the technical field of production of rare-earth carbonate, and particularly relates to a method for precipitating excellent-acid-solubility cerium-containing rare-earth carbonate. The method comprises the following steps: carrying out ultrasonic degassing or vacuum degassing to remove dissolved gas in a cerium-containing rare-earth solution, a precipitant solution and dilution water for solutions; while stirring, reacting the degassed precipitant solution with the cerium-containing rare-earth solution until the pH value is 6.5-7.5 so as to completely precipitate the rare earth; and dehydrating the precipitate, and washing to obtain the cerium-containing rare-earth carbonate. The acid solubility effect of the cerium-containing rare-earth carbonate is obviously improved, the solution is clear and transparent, and the turbidity is less than 5.0NTU, so the acid solubility effect is similar to that of the product precipitated by the traditional ammonium bicarbonate. The method achieves the effect of enhancing the acid solubility of the cerium-containing rare-earth carbonate, is simpler to operate, and has certain industrial popularization meanings.

Description

technical field [0001] The invention belongs to the technical field of rare earth carbonate production, and in particular relates to a method for precipitating acid-soluble rare earth carbonate containing cerium. Background technique [0002] Rare earth carbonates containing cerium mainly include cerium carbonate, lanthanum cerium carbonate, lanthanum cerium praseodymium carbonate, and cerium-less rare earth carbonate. They are important raw materials for preparing cerium nitrate, cerium ammonium nitrate, cerium sulfate, catalysts and polishing materials. Cerium carbonate or lanthanum cerium carbonate are acid-dissolved for further use, so their acid solubility is critical. The precipitant commonly used in the preparation of rare earth carbonate is ammonium bicarbonate, and the precipitated cerium carbonate or lanthanum cerium carbonate has large particles, which are easy to precipitate and wash, and have very good acid solubility. Now, due to environmental pressure, to avo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B59/00
CPCY02P10/20
Inventor 常传德李炳伟牟元璋李建飞彭欢任国华董云
Owner 淄博包钢灵芝稀土高科技股份有限公司