Method of preparing high-purity cesium carbonate and high-purity rubidium carbonate

A technology of cesium carbonate and rubidium carbonate, applied in chemical instruments and methods, rubidium/cesium/francium compounds, alkali metal compounds, etc., can solve problems such as waste of resources, and achieve the effects of saving costs, protecting resources and increasing costs

Inactive Publication Date: 2014-09-03
凌庄坤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Domestic manufacturers of lithium salts using lepidolite as raw materials often ignore the extraction of rubidium and cesium salts while extracting lithium, and the obtained by-products containing rubidium and cesium are often sold at low prices, resulting in a waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Recrystallization to remove potassium Take 1500kg of mixed alum (cesium oxide 0.11%, rubidium oxide 0.54%, potassium oxide 8.52%) and 4000kg water in a 5000L reactor, heat until completely dissolved, filter, freeze the filtrate to 25°C, filter , to obtain 605kg of mixed alum b1 (cesium oxide 0.27%, rubidium oxide 1.33%, potassium oxide 8.05%), the filtrate was further frozen to -10°C, and 850kg of alum was obtained by filtration, and the filtrate was returned to the dissolution step for reuse. Throw 10 pots of the same mixed alum and control the same conditions, and get about 6000kg of mixed alum b1 (cesium oxide 0.27%, rubidium oxide 1.33%, potassium oxide 8.05%). Take 1500kg of mixed alum b1 and add 4000kg of water, heat it in a 5000L reactor until completely dissolved, filter, freeze to 20°C, and filter to obtain 600kg of mixed alum b2 (cesium oxide 0.66%, rubidium oxide 3.32%, potassium oxide 6.22%), and the filtrate continues Freeze to -10, filter to obtain 850...

Embodiment 2

[0028] (1) Recrystallization and potassium removal Take 1200kg of mixed alum (cesium oxide 0.52%, rubidium oxide 2.52%, potassium oxide 7.52%) and 4500kg water in a 5000L reactor, heat until completely dissolved, filter, freeze the filtrate to 15°C, filter , to get 500kg of mixed alum b1 (cesium oxide 1.24%, rubidium oxide 6.28%, potassium oxide 4.75%), the filtrate was further frozen to -15°C, filtered, and 550kg of alum and filtrate were obtained, and the filtrate could be returned to the freezing step for reuse.

[0029] (2) In addition to aluminum, take 500kg of mixed alum b3 and 3600kg of pure water and heat it in a 5000L reactor until the solution boils, slowly add milk of lime prepared by food grade calcium hydroxide and pure water into the boiling solution, and adjust the pH to 7.5. Filter with a filter press to obtain a mixture of cesium sulfate, rubidium sulfate, and potassium sulfate.

[0030](3) Extraction and separation of cesium The above mixed liquid is used as ...

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Abstract

The invention relates to a method of preparing high-purity cesium carbonate and high-purity rubidium carbonate. According to the content of rubidium and cesium in mixed alum, almost potassium in alum is removed by a recrystallizing method, so that the mixed alum meets the index which is appropriate for extraction separation and is then extracted and separated. By fully utilizing the advantages of recrystallization and extraction separation, overcoming the defects and organically combining the two, the high-purity cesium carbonate and high-purity rubidium carbonate are prepared by the most efficient and economical method. The method of recrystallizing and extracting provided by the invention can be used for preparing high-purity cesium carbonate and high-purity rubidium carbonate in high price by using low price mixed alum as a raw material, so that the cost is saved and the resources are protected.

Description

technical field [0001] The invention relates to a method for preparing high-purity cesium carbonate and high-purity rubidium carbonate by using mixed alum containing cesium and rubidium as raw materials. Background technique [0002] When lepidolite is treated with sulfuric acid, a by-product of mixed alum containing rubidium, cesium and potassium can be obtained. At present, there is no report in China to prepare high-purity cesium carbonate and high-purity rubidium carbonate from this mixed alum. Domestic manufacturers of lithium salts using lepidolite as raw materials often ignore the extraction of rubidium and cesium salts while extracting lithium, and the obtained by-products containing rubidium and cesium are often sold at low prices, resulting in a waste of resources. The invention adopts the method of recrystallization and extraction, and uses low-priced mixed alum as raw materials to prepare high-priced high-purity cesium carbonate and high-purity rubidium carbonat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D17/00
Inventor 凌庄坤
Owner 凌庄坤
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