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Methods of making cesium salts and other alkali metal salts

An alkali metal sulfate and alkali metal technology, applied in the field of cesium salts and other alkali metal salts, can solve problems such as danger, soluble calcium salt pollution, and no need to consider removing impurities, etc.

Inactive Publication Date: 2004-07-14
SINOMINE RESOURCE EXPLORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires the use of soluble lime acid salts, such as calcium formate, and does not take into account the removal of many of the impurities present in cesium salt solutions that form
If the exact stoichiometric amount required is exceeded by just a little, there is a real risk of contamination of the final product with soluble calcium salts

Method used

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Examples

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preparation example Construction

[0017] The present invention relates to the preparation method of cesium salt, and further relates to the preparation method of cesium hydroxide. Furthermore, the present invention relates to processes for the preparation of alkali metal salts and alkali metal hydroxides.

[0018] In a preferred method of preparing the cesium salt, a solution comprising cesium sulfate is reacted with lime to form a solution comprising at least cesium hydroxide. A calcium sulphate-comprising residue is also formed in the reaction, usually in the form of a precipitate. The residue comprising calcium sulfate is then removed from the solution, and the cesium hydroxide in the solution is converted to at least one cesium salt.

[0019] The reaction of the cesium sulfate-containing solution with lime can take place essentially at any temperature, preferably at a temperature of about 0°C to about 100°C, more preferably at a temperature of about 0°C to about 50°C, and even more preferably at a tempera...

Embodiment 1

[0053] Analytical evaluation of filtered and pH-neutral dilute cesium sulphate solution, about 6% by weight, with respect to properties, including the content of impurities insoluble in the lye. These samples were used in each of the examples described below. Including g / l cesium, it is worth noting that lye-insoluble impurities greater than or equal to 1ppm are described as follows: 47g / l cesium

[0054] 476ppm Calcium

[0055] 2470ppm magnesium

[0056] 57ppm Manganese

[0057] 33ppm silicon

[0058] 3ppm Aluminum

[0059] 1ppm boron

[0060] 5ppm Thallium

Embodiment 2

[0062] 15g barium hydroxide monohydrate was added in the cesium sulfate stock solution of 250ml embodiment 1. All soluble sulfate was removed by precipitating insoluble barium sulfate. The slurry was filtered to remove insoluble precipitate residues. The dilute cesium hydroxide filtrate was analyzed and contained <10 ppm sulfate and 370 ppm barium. Adjusting to use slightly more than 1% barium, the soluble sulfate charge in the starting cesium sulfate was calculated to contain 28253 ppm soluble sulfate. The sulfate content and barium hydroxide requirement for a typical dilute cesium sulfate stock solution were used as benchmarks for the example process steps cited below.

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PUM

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Abstract

A method of making a cesium salt is described and involves reacting a cesium sulfate containing solution with lime to form 1) a solution containing at least cesium hydroxide and 2) a residue comprising calcium sulfate. The method further involves removing the residue from the solution and converting the cesium hydroxide that is present in the solution to at least one type of cesium salt. The present invention further relates to uses of the cesium salt as well as methods of making cesium hydroxide using lime. Also, methods of making alkali metal salts and alkali metal hydroxides are also described.

Description

technical field [0001] The invention relates to cesium salt and other alkali metal salts, and a preparation method thereof. Background technique [0002] Cesium salts (eg cesium formate) are increasingly being found as useful additives in many industrial applications (eg hydrocarbon recovery). Accordingly, it is desirable to develop methods for the efficient and economical production of cesium salts of relatively high purity. [0003] Previously, barium hydroxide and soluble barium salts have been used as reactants with cesium sulfate solutions to form cesium salts. However, barium compounds are expensive reactants and are therefore undesirable. [0004] Other approaches have attempted to avoid the use of barium compounds and have used cesium-aluminum-alum to react with calcium hydroxide and water-soluble calcium salts in the presence of water. However, this method requires the use of soluble lime acid salts, such as calcium formate, and does not allow for the removal of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D1/20C01D3/04C01D3/10C01D3/12C01D5/16C01D9/04C01D17/00C01F11/46
CPCC01D3/10C01D1/20C01F11/46C01D3/12C01D5/16C01D3/04C01D17/00C01D9/04
Inventor 巴特·F·巴基
Owner SINOMINE RESOURCE EXPLORATION
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