Method for preparing cesium carbonate by ion exchange method

An ion exchange method, cesium carbonate technology, applied in chemical instruments and methods, rubidium/cesium/francium compounds, alkali metal compounds, etc., can solve the problems of complex process, reduce cesium carbonate, difficult to operate, etc., to improve the system yield , the process is simple, avoid the effect of post-processing

Active Publication Date: 2013-08-14
百杰瑞(荆门)新材料有限公司
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Problems solved by technology

This method needs to add barium salt. During the production process, a large amount of barium-containing precipitates will be precipitated. A large amount of precipitation will take away part of the cesium salt and reduce the yield of cesium carbonate. Moreover, barium is a heavy metal and is highly toxic, which will cause great safety hazards. hidden danger; the other is to add cesium sulfate conversion solution to t-BAMBP for extraction, then pass the extract into carbon dioxide and pure water for back extraction, and the back extraction solution is concentrated and crystallized to obtain cesium carbonate
This method uses an organic extractant, the cost is high, the extractant is difficult to reuse, the yield is low, and it is easy to cause environmental pollution
Xinjiang Institute of Nonferrous Metals once proposed to use cation exchange resin to convert cesium ion Cs in cesium sulfate aqueous solution + Adsorbed on the resin, then elute the cesium ions on the resin into the eluent through the eluent, and then pass through carbon dioxide to carbonize and concentrate the crystallization. This method needs to elute the resin, and cesium will be lost during the elution process. Reduced the yield of cesium, and this method has no purification effect to cesium carbonate, has high requirements on raw material quality, complex process, and is not easy to operate

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  • Method for preparing cesium carbonate by ion exchange method

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Embodiment 1

[0026] A method for preparing cesium carbonate by ion exchange method, its steps are as follows:

[0027] A. Acid leaching cesium garnet: put 3.5Kg cesium garnet into 35wt% sulfuric acid for acid leaching, the liquid-solid mass ratio is 3:1, the reaction temperature is 130°C, the reaction time is 4h, and the filter is kept above 90°C to obtain acid leaching liquid;

[0028] B, the pickling liquid is cooled to room temperature heavy alum, centrifugal separation gets thick alum 3Kg, discharges after separating mother liquor neutralization treatment, adds pure water in the separated thick alum and carries out twice recrystallization, the liquid-solid mass ratio of each recrystallization The ratio is 8:1, adding pure water to dissolve each time, then heating, evaporating and concentrating to one-third of the original volume, then cooling to room temperature to crystallize to obtain 2.7Kg of refined cesium alum, and the recrystallization mother liquor participates in the circulatio...

Embodiment 2

[0037] A method for preparing cesium carbonate by ion exchange method, its steps are as follows:

[0038] A. Acid leaching cesium garnet: put 35Kg cesium garnet into 35wt% sulfuric acid for acid leaching, the liquid-solid mass ratio is 3:1, the reaction temperature is 130°C, the reaction time is 4h, keep above 90°C and filter to obtain the acid leaching solution ;

[0039] B, the pickling liquid is cooled to room temperature heavy alum, centrifugal separation obtains 31Kg rough alum, discharges after separating mother liquor neutralization treatment, adds pure water in the separated thick alum and carries out twice recrystallization, the liquid-solid mass ratio of each recrystallization The ratio is 8:1, adding pure water to dissolve each time, then heating, evaporating and concentrating to one-third of the original volume, then cooling to room temperature to crystallize to obtain 27.12Kg of refined cesium alum, and the recrystallization mother liquor participates in circu...

Embodiment 3

[0047] A method for preparing cesium carbonate by ion exchange method, its steps are as follows:

[0048] A. Acid leaching cesium garnet: put 220Kg cesium garnet into a reaction kettle with 35wt% sulfuric acid for acid leaching, the liquid-solid mass ratio is 3:1, the reaction temperature is 130°C, the reaction time is 4h, and the filter is kept above 90°C , to get pickling solution;

[0049] B, the pickling solution is cooled to room temperature to sink alum, centrifuged to get rough alum 200Kg, discharge after separation of mother liquor neutralization treatment, add pure water to carry out twice recrystallization in the rough alum of separation, the liquid-solid mass ratio of each recrystallization The ratio is 8:1, adding pure water to dissolve each time, heating, evaporating and concentrating to one-third of the original volume, then cooling to room temperature to crystallize to obtain 180Kg of refined cesium alum, and the recrystallization mother liquor participates ...

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Abstract

The invention relates to the technical field of a preparation method of cesium carbonate and in particular relates to a method for preparing cesium carbonate by an ion exchange method. The method is applicable to preparation of high-purity pollution-free cesium carbonate. The method comprises the following steps of: performing acid leaching, jarosite precipitation, recrystallization and conversion on pollucite to obtain a conversion solution of cesium sulfate; exchanging by using 201*7 strongly alkaline styrene anion exchange resin to obtain a cesium hydroxide solution; and introducing carbon dioxide into the cesium hydroxide solution and neutralizing to prepare a caesium bicarbonate solution; and concentrating, crystallizing, separating and drying to obtain the cesium carbonate finished product. The obtained product is high in purity, simple in process flow, economic and environment-friendly, and suitable for industrialized production; and the process adopting the anion exchange resin is simpler than the process adopting cation exchange resin and elution is avoided, so cesium loss in an eluting process is avoided, the system yield is increased, and the system yield after a mother liquid participates in circulation can reach 92 to 95 percent.

Description

technical field [0001] The invention relates to the technical field of preparation methods of cesium carbonate, in particular to a method for preparing cesium carbonate by an ion exchange method, which is suitable for the preparation of high-purity and pollution-free cesium carbonate. Background technique [0002] Cesium carbonate, molecular formula Cs 2 CO 3 , white crystalline powder, is the basic raw material for the preparation of various cesium salts, and is also widely used in petrochemical, power generation, special optical glass and ceramic industries, sulfuric acid industry, analytical reagents, etc. With the continuous development of cesium salt applications, cesium carbonate products will have a very considerable market prospect. [0003] The existing cesium carbonate preparation process generally adopts the acid method to process cesium ore to obtain cesium alum, which is converted into cesium sulfate solution by adding lye, and then there are two processing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D17/00
Inventor 纪东海赵正红陈凯罗钊
Owner 百杰瑞(荆门)新材料有限公司
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