Process of extraction of high-purity soluble cerium hydroxide from fluorine-carbon-cerium mixed rare earth carbonate

A technology of rare earth carbonate and cerium hydroxide, applied in rare earth metal compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problems of high content of non-rare earth impurities, high consumption of acid and alkali, high production cost, low preparation cost, The effect of less waste water and less investment in equipment infrastructure

Active Publication Date: 2013-11-20
江苏国源稀土新材料有限公司
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Problems solved by technology

Disadvantages are: the treatment process needs to consume a lot of acid and alkali, and the production cost is very high
The disadvantages are: the purity of cerium products is not enough, and the content of non-rare earth impurities is high

Method used

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  • Process of extraction of high-purity soluble cerium hydroxide from fluorine-carbon-cerium mixed rare earth carbonate

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Embodiment Construction

[0017] A process for extracting high-purity soluble cerium hydroxide from bastnaesic mixed rare earth carbonates, taking Baotou mixed rare earth carbonates: total amount of rare earth oxides TREO=41.25%; SO 4 2- =2.51%, put the mixed rare earth carbonate into the reaction tank, add hydrochloric acid (31%) with a mass percentage concentration of 31% according to the solid-liquid mass ratio of 1:0.7-0.8, and adjust the pH=3-4;

[0018] Boil the feed liquid, add BaCl 2 , BaCl 2 The mass ratio of mixed rare earth carbonate is 0.05-0.07:1, put it into the filter box for filtration, collect the filtrate and pour it into another reaction tank, add ammonia water and hydrogen peroxide to the filtrate, the mass ratio of filtrate, ammonia water and hydrogen peroxide is 1: 0.3-0.4: 0.1-0.2, a dark red precipitate appears, boils, the color becomes a yellow precipitate; after adding BaCl 2 , BaCl 2 : SO 4 2- The molar ratio is not less than 2.5:1.

[0019] Put the material into the ...

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Abstract

A process of extraction of high-purity soluble cerium hydroxide from a fluorine-carbon-cerium mixed rare earth carbonate comprises the steps: taking the mixed rare earth carbonate, firstly dissolving by an acid, then removing SO4<2->, next carrying out hydrolytic precipitation of cerium to generate cerium hydroxide, then dissolving cerium hydroxide in the hydrochloric acid medium to form a Ce<4+> solution with the hydrochloric acid weak acidic medium, controlling conditions, precipitating again in the weak acidic medium to make a lot of metal impurities remain in the solution, and thereby obtaining cerium hydroxide which contains the quite low content of non rare earth impurities and can be easily dissolved in a nitric acid medium. Hydrolytic precipitation of the rare earth adopted by the invention is complete, so a large amount of alkali is saved; an oxidant is added to allow cerium to be greatly oxidized into tetravalent cerium, and thus achievement of hydrolytic precipitation is facilitated, so as to realize an effect of high percentage extraction of cerium. The process generates a small amount of waste water, is simple, has low preparation cost, is expected to large-scale industrial production, and has certain economic benefits and quite good social benefits.

Description

technical field [0001] The invention relates to the field of rare earth metallurgy, in particular to a process for extracting high-purity soluble cerium hydroxide by mixing cerium bicarbonate with rare earth carbonate. Background technique [0002] Carbon-cerium mixed rare earth carbonate contains about 50% cerium oxide. If the extraction tank is used to extract cerium chloride products through cascade extraction, a large amount of acid, alkali and other auxiliary materials will be consumed, and the volume of the extraction tank equipment required is very large. Big. Therefore, at present, manufacturers use the price-changing performance of cerium to separate cerium from non-cerium and extract cerium chloride products, but the obtained cerium products have high impurity content, which seriously affects product quality and sells at very low prices. [0003] Method 1: first dissolve the mixed rare earth carbonate into rare earth chloride with hydrochloric acid, after removin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 庞忠良
Owner 江苏国源稀土新材料有限公司
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