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Preparation method of adsorbent for selectively separating cesium ions from salt lake brine

A salt lake brine and adsorbent technology, which is applied in chemical instruments and methods, crystalline aluminosilicate zeolite, other chemical processes, etc., to achieve the effect of no equipment requirements, simple operation, and good adsorption selection.

Inactive Publication Date: 2015-06-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After consulting the literature, no reports have been found on the synthesis of zeolite molecular sieves that selectively adsorb cesium ions using cesium ions as templates

Method used

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  • Preparation method of adsorbent for selectively separating cesium ions from salt lake brine
  • Preparation method of adsorbent for selectively separating cesium ions from salt lake brine
  • Preparation method of adsorbent for selectively separating cesium ions from salt lake brine

Examples

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Effect test

Embodiment 1

[0038] According to the Si / Al molar ratio being 5.2, prepare 200ml of sodium metaaluminate (NaAlO 2 ) solution and 780ml molar concentration of 0.8M water glass solution (Na 2 SiO 3 9H 20), and in the sodium metaaluminate solution, add 0.6g cetyltrimethylammonium bromide, 1.2g triethanolamine and 6g cesium nitrate successively, stir and fully dissolve to obtain mixed solution A; Then, at room temperature, open Stir, slowly drop the mixed solution A into the prepared water glass solution, and use 10% sodium hydroxide solution to control the pH of the reaction system to be 11.5-12. After the feeding is completed, the above-mentioned feed solution is left to age at room temperature for 48 hours to obtain a silica-alumina gel containing cesium, which is the desired precursor.

[0039] Step 2 Precursor hydrothermal crystallization

[0040] Add the silica-alumina gel obtained above containing cesium into a hydrothermal reaction kettle, and crystallize hydrothermally at 160°C for...

Embodiment 2

[0047] According to the Si / Al molar ratio being 4.8, prepare 200ml of sodium metaaluminate (NaAlO 2 ) solution and 640ml molar concentration of 0.9M water glass solution (Na 2 SiO 3 9H 2 0), and in the sodium metaaluminate solution, add 0.5g cetyltrimethylammonium bromide, 1g triethanolamine and 12g cesium nitrate successively, stir and fully dissolve to obtain mixed solution A; Then, at room temperature, start stirring , slowly drop the mixed solution A into the prepared water glass solution, and use 10% potassium hydroxide solution to control the pH of the reaction system to be 11.5-12. After the feeding is completed, the above-mentioned feed solution is left to age at room temperature for 48 hours to obtain a silica-alumina gel containing cesium, which is the desired precursor.

[0048] Step 2 Precursor hydrothermal crystallization

[0049] Add the silica-alumina gel obtained above containing cesium into a hydrothermal reaction kettle, and crystallize it hydrothermally ...

Embodiment 3

[0056] According to the Si / Al molar ratio being 4.2, prepare 200ml of sodium metaaluminate (NaAlO 2 ) solution and 560ml molar concentration of 0.6M water glass solution (Na 2 SiO 3 9H 2 0), and in the sodium metaaluminate solution, add 0.4g cetyltrimethylammonium bromide, 0.8g triethanolamine and 3g cesium nitrate successively, stir and fully dissolve to obtain mixed solution A; Then, at room temperature, open Stir, slowly drop the mixed solution A into the prepared water glass solution, and use 12% lithium hydroxide solution to control the pH of the reaction system to be 11.5-12. After the feeding is completed, the above-mentioned feed solution is left to age at room temperature for 48 hours to obtain a silica-alumina gel containing cesium, which is the desired precursor.

[0057] Step 2 Precursor hydrothermal crystallization

[0058] Add the silica-alumina gel obtained above containing cesium into a hydrothermal reaction kettle, and crystallize hydrothermally at 170°C f...

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Abstract

The invention discloses a preparation method of an adsorbent for selectively separating cesium ions from salt lake brine, belonging to the field of non-ferrous metallurgy. The method for preparing the adsorbent comprises the following steps: by taking the cesium ions as a template agent, mixing a surfactant, a soluble cesium salt, sodium silicate and sodium aluminate, regulating the pH value of the system by using an alkaline solution, thereby obtaining cesium-containing silica-alumina gel; crystallizing to obtain a precursor under hydrothermal conditions, washing and calcining the precursor, thereby obtaining cesium-containing artificial zeolite; eluting the artificial zeolite, desorbing Cs<+> from the cesium-containing artificial zeolite, filtering, and separating, thereby obtaining an artificial zeolite ion sieve with a cesium ion customized pore structure, wherein the selective adsorption performance on Cs<+> in the salt lake brine is excellent. The method disclosed by the invention is simple in process and does not have any special requirement on equipment, and the prepared adsorbent is stable in properties and long in service life, has high selectivity and good enrichment effect on the cesium ions in the salt lake brine and has good industrialization application prospects.

Description

technical field [0001] The invention relates to a preparation method of an adsorbent for selectively separating cesium ions from salt lake brine, belonging to the field of nonferrous metal metallurgy. technical background [0002] my country is relatively rich in cesium resources, and its reserves rank among the best in the world, but cesium mineral resources are few and of low grade, and a considerable part of cesium resources exist in salt lake brine. However, Cs in salt lake brine + The concentration is low (about 1mg / L), and there is also a high concentration of K + 、Na + , Li + Alkali metal ions with relatively similar properties, this situation brings great difficulties to the separation and enrichment of rubidium and cesium. [0003] Aiming at the development of the separation and extraction technology of rubidium and cesium in salt lake brine, domestic and foreign scientific and technological workers have carried out quite extensive research and made some progres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02B01J20/18
Inventor 李玉虎刘志宏李启厚刘付朋陈欢刘智勇
Owner CENT SOUTH UNIV
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