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Production technology of low-sulfur lanthanum hydroxide

A technology of lanthanum hydroxide and production process, applied in the fields of rare earth metal oxides/hydroxides, inorganic chemistry, rare earth metal compounds, etc., can solve the problem of high sulfur content of lanthanum hydroxide

Active Publication Date: 2016-10-26
乐山沃耐稀电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a low-sulfur lanthanum hydroxide production process to solve the problem of high sulfur content in existing lanthanum hydroxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1), 1 weight part of lanthanum carbonate is added to 1.5 parts by weight of pure water to form a lanthanum carbonate solution,

[0022] (2), add concentrated nitric acid to dissolve in the mixed liquor that step (1) obtains, and adjust pH to 1.8 with ammoniacal liquor, be heated to boiling, after 40 minutes, then use lanthanum carbonate to adjust pH to 4.2 to the acid solution;

[0023] (3), the acid solution obtained in the step (2) is filtered to obtain the filtrate through the aperture of 200 mesh filter cloth;

[0024] (4), the filtrate obtained by step (3) is filtered by a microporous filter with an aperture of 3um;

[0025] (5), the filtrate in (4) is concentrated, the solution concentration is 730 grams per liter in terms of lanthanum oxide, pH=1.3;

[0026] (6), put the solution in (5) into the crystallization dish to crystallize naturally, and centrifuge and dehydrate;

[0027] (7), the crystal in (6) is dissolved;

[0028] (8) adding ammonia water to the f...

Embodiment 2

[0033] (1), 1 weight part of lanthanum carbonate is added to 2 weight parts of pure water to form a lanthanum carbonate solution,

[0034] (2), add concentrated nitric acid to dissolve in the mixed solution that step (1) obtains, and adjust pH to 1.5 with ammoniacal liquor, be heated to boiling, after 30 minutes, then adjust pH to 4 to acid solution with lanthanum carbonate;

[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 that step (3) is obtained is filtered with the microporous filter of 5um again with aperture;

[0037] (5), the filtrate in (4) is concentrated, and the solution concentration is 750 grams per liter in terms of lanthanum oxide, pH=1;

[0038] (6), put the solution in (5) into the crystallization dish to crystallize naturally, and centrifuge and dehydrate;

[0039] (7), the crystal in (6) is dissolved;

[0040] (8) Add ammonia water to the f...

Embodiment 3

[0045] (1), 1 weight part of lanthanum carbonate is added to 1 weight part of pure water to form a lanthanum carbonate solution,

[0046] (2), add concentrated nitric acid to dissolve in the mixed solution that step (1) obtains, and adjust pH to 2 with ammoniacal liquor, be heated to boiling, after 30 minutes, then use lanthanum carbonate to adjust pH to 4.5 to the acid solution;

[0047] (3), the acid solution obtained in the step (2) is filtered to obtain the filtrate through the aperture of 200 mesh filter cloth;

[0048] (4), the filtrate obtained by step (3) is filtered by a microporous filter with an aperture of 1um;

[0049] (5), the filtrate in (4) is concentrated, the solution concentration is 720 grams per liter in terms of lanthanum oxide, pH=1.5;

[0050] (6), put the solution in (5) into the crystallization dish to crystallize naturally, and centrifuge and dehydrate;

[0051] (7), the crystal in (6) is dissolved;

[0052] (8) Add ammonia water to the filtrate i...

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Abstract

The invention discloses a production technology of low-sulfur lanthanum hydroxide. The production technology comprises the following steps: (1) dissolving lanthanum carbonate in nitric acid to obtain a lanthanum nitrate solution; (2) regulating the pH value of the lanthanum nitrate solution obtained in the step (1) to 1.5-2, heating, adding the lanthanum carbonate to regulate the pH value to 4-4.5, and filtering to obtain filtrate; (3) concentrating and crystallizing the filtrate obtained in the step (2) to obtain a lanthanum carbonate crystal, and carrying out centrifugal dewatering; (4) dissolving the lanthanum carbonate crystal obtained by the centrifugal dewatering in the step (3), adding ammonium hydroxide to regulate the pH value to 7, standing to obtain a mixture which contains precipitates, and heating the mixture; (5) carrying out plate frame filtering on the heated mixture in the step (4) to obtain the precipitates; (6) drying the precipitates obtained in the step (5) on a vulcanization bed to obtain a low-sulfur lanthanum hydroxide finished product. In the lanthanum hydroxide product produced by the method, the sulfur content is less than 0.002%, and the contents of other metal impurities including calcium, iron, sodium, potassium, lead, manganese, magnesium, chromium, copper, zinc and the like are all less than 0.0005%.

Description

technical field [0001] The invention belongs to the field of rare earths, and in particular relates to a production process of low-sulfur lanthanum hydroxide. Background technique [0002] Lanthanum hydroxide, molecular formula La(OH)3, three-way catalyst, used in glass, ceramics, electronics industry, etc. [0003] The lanthanum hydroxide produced on the market is mainly obtained by acid dissolution and precipitation of lanthanum carbonate. The sulfur content of lanthanum hydroxide is generally >0.015%, which is difficult to meet the requirements of customers. Contents of the invention [0004] The purpose of the invention is to provide a low-sulfur lanthanum hydroxide production process to solve the problem of high sulfur content in the existing lanthanum hydroxide. [0005] The technical scheme of the present invention is: a kind of low-sulfur lanthanum hydroxide production process, the steps are as follows: [0006] (1) lanthanum carbonate is dissolved with nitric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
CPCC01F17/206C01P2006/80
Inventor 杨青
Owner 乐山沃耐稀电子材料有限公司
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