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Production technology of low-chlorine cerium carbonate

A production process, cerium carbonate technology, applied in rare earth metal carbonates, rare earth metal compounds, inorganic chemistry, etc., can solve the problem of high chloride ion content of cerium carbonate

Active Publication Date: 2017-01-18
四川沃耐稀新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to provide a production process of low-chloride cerium carbonate, which solves the problem that the existing cerium carbonate chloride ion content is too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1), add 1 part of cerium carbonate to 1.5 parts of pure water to form a mixed solution

[0020] (2), add concentrated nitric acid to dissolve in the mixed solution that step (1) obtains, and adjust pH to 1.8 with ammoniacal liquor, after heating for 30 minutes, then adjust pH to 4.3 to acid solution with cerium carbonate.

[0021] (3), the acid solution obtained in the step (2) is filtered to obtain the filtrate through the aperture of 200 mesh filter cloth;

[0022] (4), the filtrate obtained by step (3) is filtered by a microporous filter with an aperture of 3um;

[0023] (5), the filtrate in step (4) is diluted to CeO 2 The concentration is 70 g / L. At 55 degrees Celsius, add a certain concentration of ammonium bicarbonate solution with a concentration of 100 g / L to precipitate at 55 degrees Celsius. After the precipitation is completed, let it stand for 1 hour.

[0024] (6), wash the precipitate in step (5) with water 5 times, carry out centrifugal dehydration, an...

Embodiment 2

[0026] (1), add 1 part of cerium carbonate to 2 parts of pure water to form a mixed solution

[0027] (2), add concentrated nitric acid to dissolve in the mixed solution that step (1) obtains, and adjust pH to 1.5 with ammoniacal liquor, after heating for 30 minutes, then adjust pH to 4 with cerium carbonate to acid solution.

[0028] (3), the acid solution obtained in the step (2) is filtered to obtain the filtrate through the aperture of 200 mesh filter cloth;

[0029] (4), the filtrate that step (3) is obtained is filtered with the microporous filter of 5um again with aperture;

[0030] (5), the filtrate in step (4) is diluted to CeO 2 The concentration is 70 g / L. At 55 degrees Celsius, add a certain concentration of ammonium bicarbonate solution with a concentration of 100 g / L to precipitate at 55 degrees Celsius. After the precipitation is completed, let it stand for 1 hour.

[0031] (6), wash the precipitate in step (5) with water 5 times, carry out centrifugal dehydra...

Embodiment 3

[0033] (1), add 1 part of cerium carbonate to 1 part of pure water to form a mixed solution

[0034] (2), add concentrated nitric acid to dissolve in the mixed solution that step (1) obtains, and adjust the pH to 2 with ammoniacal liquor, after heating for 30 minutes, then adjust the pH to 4.5 with cerium carbonate to acid solution.

[0035] (3), the acid solution obtained in the step (2) is filtered to obtain the filtrate through the aperture of 200 mesh filter cloth;

[0036] (4), the filtrate obtained by step (3) is filtered by a microporous filter with an aperture of 1um;

[0037] (5), the filtrate in step (4) is diluted to CeO 2 The concentration is 70 g / L. At 55 degrees Celsius, add a certain concentration of ammonium bicarbonate solution with a concentration of 100 g / L to precipitate at 55 degrees Celsius. After the precipitation is completed, let it stand for 1 hour.

[0038] (6), wash the precipitate in step (5) with water 5 times, carry out centrifugal dehydration,...

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Abstract

The invention discloses a production technology of low-chlorine cerium carbonate. The technology comprises the following steps: 1, mixing cerium carbonate with water to form a mixed solution; 2, adding concentrated nitric acid to the mixed solution obtained in step 1, adjusting the pH value of the obtained solution to 1.5-2 by using ammonia water, heating the adjusted solution, and adjusting the pH value of the heated solution to 4-4.5 by using cerium carbonate in order to obtain an acid solution; 3, filtering the acid solution obtained in step 2 to obtain a filtrate; 4, diluting the filtrate obtained in step 3 to make the CeO2 concentration reach 70 g / L, adding an ammonium bicarbonate solution slowly first and then fast to precipitate at 55 DEG C, and allowing the obtained solution to stand after precipitation is completed in order to obtain a precipitate; and 5, washing the precipitate obtained in step 4 with water, centrifuging and dehydrating the washed precipitate, and packaging the dehydrated precipitate. The Cl<-> content of the cerium carbonate product produced through the method is smaller than 0.002%. The content of Fe, Ca, Na, K, Pb, Zn, Mn, Al, Cu, Ni, Co and Cr is smaller than 0.002%.

Description

technical field [0001] The invention belongs to the field of rare earths, and in particular relates to a production process of low-chloride cerium carbonate. Background technique [0002] Cerium carbonate can be used as a raw material for other cerium products (cerium oxide, cerium ammonium nitrate, cerium hydroxide, cerium ammonium sulfate, etc.), and this product is widely used in various new automobile exhaust purifiers, polishing powders, chemical catalysts, etc. [0003] Cerium carbonate currently on the market is mainly obtained by precipitation of cerium chloride liquid as a raw material, and the produced cerium carbonate product has an excessively high chloride ion content (>0.03%). Difficulty meeting customer requirements. Contents of the invention [0004] The purpose of the present invention is to provide a production process of low-chloride cerium carbonate, which solves the problem that the existing cerium carbonate chloride ion content is too high. [00...

Claims

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Application Information

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IPC IPC(8): C01F17/00
CPCC01F17/247C01P2006/80
Inventor 杨青
Owner 四川沃耐稀新材料科技有限公司
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