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Precipitate flotation separation system of rubidium and cesium in aqueous solution and application thereof

An aqueous solution and flotation technology, which is applied in the precipitation flotation system, the removal of cesium, and the field of rubidium in radioactive waste liquid, can solve the problems of rubidium and cesium precipitates that are difficult to recycle and reuse, the preparation process of composite materials is complicated, and it is difficult to extract and separate. , achieving fast solid-liquid separation rate, thorough solid-liquid separation and wide application range

Inactive Publication Date: 2019-10-01
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since ammonium phosphotungstate is a structurally stable inorganic substance, it is extremely difficult to form a structurally stable composite separation material with the matrix material through a strong force, and the cycle stability is not enough, and there will be different degrees of dissolution loss during cycle use. The preparation process of some composite materials is complex
[0007] Regarding the rubidium and cesium in the flotation separation solution, Ma Fuqiu and others used potassium ferrocyanide as a precipitation reagent to investigate the precipitation flotation of cesium in radioactive waste liquid. Compared with solid or liquid resource ores containing rubidium and cesium, radioactive waste liquid Said that the system is simple and the separation difficulty is small, but at the same time, the rubidium and cesium precipitates formed by potassium ferrocyanide are difficult to recycle; moreover, the existing flotation methods are all aimed at solid ore, which is difficult to be used for radioactive waste liquid Extraction and separation of rubidium and cesium

Method used

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  • Precipitate flotation separation system of rubidium and cesium in aqueous solution and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] First to 500mL Cs + Add 0.5mmol of ammonium phosphotungstate to 1mmol / L CsCl solution, stir for 60 minutes, add 0.01g of cetyltrimethylammonium chloride, 0.1mL of No. 2 oil, stir for 30 minutes, place in flotation Flotation separation is carried out in the tank, the flotation foam is collected, and the Cs in the flotation substrate is + Concentration (the calculated removal rate is 95.6%).

[0061] During the regeneration process, add the foam collected by flotation into 100mL 2mol / L ammonium chloride and stir for 2 hours, and then separate by air flotation. The flotation foam is the regenerated flotation system and can be used in the next flotation separation solution rubidium, cesium. The flotation tail liquid is a mixed solution of cesium chloride and ammonium chloride.

Embodiment 2

[0063] First add 500mL Rb + Add 0.5mmol of ammonium phosphotungstate to the 1mmol / L RbCl solution, stir for 45 minutes, then add 0.01g of cetyltrimethylammonium chloride, 0.1mL of No. 2 oil, stir for 30 minutes, place in flotation Carry out flotation separation in the tank, collect the flotation foam, and carry out the Rb in the flotation substrate + Concentration (the calculated removal rate is 93.5%).

[0064] During the regeneration process, add the foam collected by flotation into 100mL 3mol / L ammonium nitrate and stir for 2 hours, and then separate by air flotation. ,cesium. The flotation tail liquid is a mixed solution of rubidium chloride and ammonium nitrate.

Embodiment 3

[0066] First to 500mL Cs + Add 0.3mmol of ammonium phosphotungstate to the 1mmol / L CsCl solution, stir for 35 minutes, then add 0.015g of cetyltrimethylammonium chloride, 0.1mL of No. 2 oil, stir for 30 minutes, place in flotation Flotation separation is carried out in the tank, the flotation foam is collected, and the Cs in the flotation substrate is + Concentration (the calculated removal rate is 96.3%).

[0067] The regeneration steps are basically the same as in Example 1.

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Abstract

The invention discloses a precipitate flotation separation system of rubidium and cesium in an aqueous solution and application thereof. The precipitate flotation separation system comprises a precipitant, a collecting agent and a foaming agent, wherein the precipitant at least comprises phosphomolybdate, and the collecting agent and the foaming agent at least include a cationic surfactant. The invention also discloses a flotation separation method of rubidium and cesium ions in the aqueous solution. The flotation separation method comprises the steps of adding the precipitant, the collectingagent and the foaming agent into the aqueous solution containing the cesium ions for a reaction to precipitate the cesium ions, wherein the precipitant at least comprises phosphomolybdate, and the collecting agent and the foaming agent at least comprise the cationic surfactant. Precipitated solids obtained by the reaction are collected through flotation separation treatment. The precipitate flotation system taking phosphomolybdate as the precipitant is provided through the combination of precipitation and flotation processes, can be used for separating and extracting rubidium and cesium resources or removing rubidium and cesium ions in radioactive waste liquid, and can solve the problems of dissolution loss of loaded ammonium phosphomolybdate adsorbents, complex material preparation and the like in a use process.

Description

technical field [0001] The invention relates to a precipitation flotation system, in particular to a precipitation flotation separation system for rubidium and cesium in an aqueous solution using phosphotungstate as a precipitant, and a method for removing rubidium and cesium in radioactive waste liquid, which belongs to element separation and environmental chemistry. Background technique [0002] Rubidium and cesium compounds are widely used in electronics, special glass, catalyst, energy, medicine and other fields due to their unique physical and chemical properties. In recent years, especially the leap-forward development of national defense technology, three aviation industries and new energy, the demand for rubidium and cesium has been increasing, and the application range of rubidium and cesium has become wider and wider. Therefore, efficient industrial separation and extraction of rubidium and cesium in natural resources is a necessary and important task at present. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/02C22B7/00C22B26/10G21F9/06
CPCB03D1/02C22B7/006C22B26/10G21F9/06B03D2203/008Y02P10/20
Inventor 叶秀深房得珍刘海宁李明珍张慧芳王世栋钱志强吴志坚葛飞
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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