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Method of preparing ceria by mixed precipitant

A technology of mixed precipitation and ceria, which is applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve the problems of difficult large-scale production, long preparation process time, high processing cost, etc., and achieve transportation cost reduction, obvious Social benefits and environmental benefits, the effect of reducing processing costs

Active Publication Date: 2015-09-09
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Guo Zhiyan et al. (Functional Materials, 2007 Supplement (Vol. 38), pp. 2096-2098) used urea as a carbon source to prepare basic cerium carbonate under hydrothermal conditions. The preparation process took a long time, the processing cost was high, and the required temperature was high. , not easy to scale production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Dissolve 150Kg of industrial-grade ammonium bicarbonate with a nitrogen content>17% in pure water to prepare an ammonium bicarbonate solution with a molar concentration of 3.50 mol / L. Aqueous ammonia solution with a molar concentration of 10.50 mol / L was prepared with a mass percent concentration of 19.35% industrial grade ammonia. Take the above-mentioned ammonium bicarbonate solution and ammonia solution respectively, and prepare 720 L of mixed precipitant solution with a total molar concentration of 5.50 mol / L according to the ratio of total molar ammonium bicarbonate:total molar ammonia water=45:55. A cerium chloride solution with a concentration of 0.60 mol / L, pH=4.0, and a volume of 2000 L was introduced into the reaction tank, heated to 65° C., and 30 Kg of seed crystals were added. The seed crystals contained 94% by mass fraction of basic cerium carbonate, 4 % cerium carbonate and 2% cerium hydroxide, uniformly add the above-mentioned mixed precipitant solution ...

Embodiment 2

[0021] Dissolve 182Kg of industrial-grade ammonium bicarbonate with a nitrogen content>17% in pure water to prepare an ammonium bicarbonate solution with a molar concentration of 2.98mol / L. Aqueous ammonia solution with a molar concentration of 10.10 mol / L was prepared with a mass percent concentration of 18.56% industrial grade ammonia. Take the above-mentioned ammonium bicarbonate solution and ammonia solution respectively, and prepare 950L of mixed precipitant solution with a total molar concentration of 4.61mol / L according to the ratio of total molar ammonium bicarbonate: total molar ammonia water is 50:50. A cerium chloride solution with a concentration of 0.90mol / L, pH=4.5, and a volume of 1500L was introduced into the reaction tank, heated to 65°C, and 25Kg of seed crystals were added. The seed crystals contained 94% mass fraction of basic cerium carbonate, 5 % cerium carbonate and 1% cerium hydroxide, uniformly add the above-mentioned mixed precipitant solution 950L un...

Embodiment 3

[0023] Dissolve 245Kg of industrial-grade ammonium bicarbonate with a nitrogen content>17% in pure water to prepare an ammonium bicarbonate solution with a molar concentration of 1.10mol / L. Aqueous ammonia solution with a molar concentration of 10.10 mol / L was prepared with a mass percent concentration of 18.56% industrial grade ammonia. Take the above-mentioned ammonium bicarbonate solution and ammonia solution respectively, and prepare 2930 L of mixed precipitant solution with a total molar concentration of 2.00 mol / L according to the ratio of total molar ammonium bicarbonate:total molar ammonia water=50:50. A cerium chloride solution with a concentration of 1.20 mol / L, pH=4.5, and a volume of 1500 L was introduced into the reaction tank, heated to 60° C., and 31 Kg of seed crystals were added. The seed crystals contained 94% by mass fraction of basic cerium carbonate, 5 % cerium carbonate and 1% cerium hydroxide, uniformly add the above-mentioned mixed precipitant solution ...

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Abstract

A method of preparing ceria by a mixed precipitant mainly comprises the steps of enabling a mixed solution of ammonium bicarbonate and ammonia as the precipitant to perform combined action with inoculating crystals, precipitating rare earth ions in a rare earth chloride solution to obtain a mixture with primary alkali type cerous carbonate and subsidiary cerous carbonate and cerium hydroxide, and further firing to prepare a rare earth ceria product. The prepared ceria accords with industry standards; reaction conditions of the method are mild; energy consumption during preparing process is obviously reduced, and the cost is low; meanwhile, the carbon dioxide emission is greatly reduced, and obvious social benefit and environmental benefit are achieved.

Description

technical field [0001] The invention relates to a rare earth element separation method, in particular to a rare earth hydrometallurgical separation method. Background technique [0002] Rare earth elements are known as the "vitamins" of modern industry and the "treasure house" of magical new materials. 90% of the rare earths traded in the market are rare earth oxides. At this stage, rare earth oxides are mainly prepared by burning rare earth carbonates as intermediates. Only from the conversion process of materials, 767.44 kg of carbon dioxide will be emitted to prepare 1 ton of ceria. Due to the global emphasis on carbon dioxide emission reduction, the search for preparation methods with lower manufacturing costs, less carbon dioxide emissions, and better dispersion properties of rare earth oxides has attracted more and more attention from the rare earth community. [0003] Cerium dioxide is mainly used in the glass industry as stabilizers, decolorizers, radiation-proof gl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 韩树民卢国贞刘义
Owner YANSHAN UNIV
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