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Process for preparing cerium hydroxide

A cerium hydroxide and oxidant technology, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve the problems of difficult filtration of cerium hydroxide products, low purity of cerium hydroxide, and many non-rare earth impurities, etc. The effect of nitric acid solubility, clear and transparent solution, and cheap raw materials

Inactive Publication Date: 2006-12-13
北京方正稀土科技研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cerium hydroxide produced by this method is easy to filter, has a high oxidation rate and a fast reaction speed, but there are still serious shortcomings: the process is cumbersome and the process is too long; there are many raw and auxiliary materials used, and more non-rare earth impurities are introduced, which makes the cerium hydroxide Low purity; multiple solid-liquid separations, many washing times, lower yield
[0008] The preparation methods of the above-mentioned cerium hydroxide all start from the mixed rare earth feed liquid, and the obtained cerium hydroxide product is difficult to filter and the product purity is low, which will entrain and wrap Na + , Mn 2+ , SO 4 2- and other rare earth impurities, etc., which make the purity of cerium hydroxide obtained by these methods low, and in many fields with high requirements for product impurities, such as the manufacture of automobile exhaust purifiers, the production of ammonium cerium nitrate, etc., the application is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Mix cerium carbonate with a purity of 99% with water to prepare CeO-containing 2 170g / L feed liquid.

[0028] 1) Add 10wt% sodium hydroxide solution under stirring, the molar ratio of the added sodium hydroxide to rare earth ions is 0.6:1, generating off-white Ce(OH) 3 precipitation.

[0029] 2) Add hydrogen peroxide, the molar ratio of hydrogen peroxide to rare earth ions is 1:1, oxidize at 65°C for 1 hour, Ce(OH) 3 It is oxidized to reddish-brown peroxide.

[0030] 3) Raise the temperature to 100°C and heat for 2 hours, the reddish-brown peroxide gradually turns into yellow Ce(OH) 4 .

[0031] 4) Wash in hot water until the pH is 7, and dry at room temperature.

[0032] 5) The cerium hydroxide sample oxidation rate obtained by step 4) is 98.8%, soluble in nitric acid, CeO 2 The content is 77%, bright yellow powder, good fluidity, of which Cl - The content is 0.048%, Na + The content is 0.0072%, and no other metal and non-metal impurities are introduced.

Embodiment 2

[0034] Directly use the CeCl from the extraction tank 3 Preparation, wherein the content of cerium oxide is 1.3mol / L, cerium oxide accounts for 99% of the total amount of rare earth, the pH of the solution is 2-3, and the rest of the process conditions are the same as in Example 1.

[0035] The cerium composition in the obtained cerium hydroxide is 99.9%, the oxidation rate is 99.3%, and the CeO 2 The content is 42%, with poor fluidity and good solubility; after rinsing with ethanol and drying at 110°C for 1 hour, the fluidity is good, CeO 2 The content can reach 77%, the solubility is still up to standard, Cl - The content is 0.050%, Na + Content 0.0063%.

Embodiment 3

[0037] Using cerium sulfate solution as raw material, wherein the concentration of cerium ion is 1.1mol / L, the pH of the solution is 2~3, adding ammonia water with a weight of 1.3ReO to the solution at room temperature to form a gray precipitate, and adding the mole of potassium permanganate and rare earth ion When the ratio is 0.5:1, the precipitate turns into a reddish-brown peroxide, which is heated to 100°C for 2 hours and decomposed into a yellow cerium hydroxide precipitate, washed until the pH is 7, rinsed with ethanol, and dried at 110°C for 1 hour. The oxidation rate of the obtained product is 98.4%, CeO 2 The content is 73%, good solubility and fluidity.

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Abstract

The invention belongs to wet method metallurgy field of rare earth production, especially relates to a preparation method for cerium hydroxide. The method comprises: (1) adding raw cerium material into alkali liquor with stirring for creating precipitate Ce(OH)3 ensuring that the mol ratio of OH ion and cerium ion is 0.5-4:1; (2) adding oxidizing agent with stirring under normal temperature with mol ratio of oxidizing agent and Ce(OH)3 as 0.1-4:1 for creating Ce(OH)4 or Ce(OH)3OOH; (3) washing the Ce(OH)4 obtained in step (2), separating the solid from liquid, airing, and obtaining the cerium hydroxide product. The invention has a wide range of application. According to different purposes, cerium hydroxide products with different purities (80~99.9999%(CeO2 / sigma RE2O3)) depending to the raw material.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy for rare earth production, in particular to a preparation method of cerium hydroxide. Background technique [0002] Cerium hydroxide is an important industrial raw material. It can be used as an additive for color TV fluorescent screens to change the toughness, strength and other optical properties of fluorescent glass. It can also be used to prepare ammonium cerium nitrate, which has very broad development prospects. [0003] There are many ways to produce cerium hydroxide, currently there are mainly four kinds as follows: [0004] (1) Chinese patent document CN 87100620A proposes a kind of method of producing cerium hydroxide, divides the acidic aqueous solution containing cerium and rare earth elements other than cerium into two parts, adds alkali metal hydroxide or ammonia in the first part, and separates the The generated rare earth hydroxide solid is added to the secon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/46C01F17/00C22B59/00
CPCY02P10/20
Inventor 廖春生王嵩龄刘营郭晓丹严纯华
Owner 北京方正稀土科技研究所有限公司
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