Method for removing cesium ions in aqueous solution employing magnetic particles

A technology of magnetic particles and aqueous solutions, applied in separation methods, magnetic objects, magnetic separation, etc., can solve the problems of increased steps, time-consuming, pipe block clogging, etc., to achieve the effect of small volume, high value, and reduced volume

Inactive Publication Date: 2014-09-17
JNC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The method of directly injecting water-insoluble ferrocyanides can be processed in a shorter time than the conventional method using a carrier, but it still takes time
Furthermore, there is a big problem that it is difficult to automate the steps including vacuum filtration, so there are many steps to manually process the high-concentration radioactive cesium precipitate, and the chance of being bombed during the processing operation increases.
However, this method also uses water-insoluble magnetic particles, so it takes time until the adsorption equilibrium is reached, and there is also a problem of column clogging, so it is difficult to put it into practical use in automated processing (Non-Patent Document 3, Non-Patent Document 4)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Put 80ml of 10% by volume seawater solution (cesium chloride concentration: 0.253mg / ml) containing cesium chloride obtained by dissolving cesium chloride in seawater and water into a 110ml screw tube bottle, and then add ferrocyanide respectively Potassium chloride trihydrate aqueous solution (concentration 100mg / ml) and purified water 1ml each. After reacting for 5 minutes at room temperature with a seesaw shaker (model BC-700) manufactured by BIO CRAFT Co., Ltd., add heat-responsive magnetic 1 ml of particles (Therma-Max, 40 mg / ml, average particle diameter 100 nm) was further reacted for 25 minutes at room temperature using a seesaw shaker (model BC-700) manufactured by BIO CRAFT Co., Ltd. Thereafter, the magnetic particles were collected using a 4000G neodymium magnet.

[0067] The supernatant after recovering the magnetic particles was collected, and the concentration of cesium ions before and after the reaction was measured by atomic absorption spectrometry. As ...

Embodiment 2

[0069] In Example 1, after adding 1 ml of an aqueous solution of potassium ferrocyanide trihydrate, 1 ml of an aqueous solution of nickel sulfate hexahydrate (concentration: 262.85 mg / ml) was added instead of purified water, and the procedure was carried out in the same manner as in Example 1. The concentration of cesium ions before and after the reaction was measured. As a result, the cesium ion concentration decreased from 240 ppm (cesium ion concentration before the reaction) to 4 ppm (cesium ion concentration in the supernatant after collecting the magnetic particles). From this, it can be seen that 98% or more of cesium ions are removed by the magnetic particles.

Embodiment 3

[0071] In a 110ml screw vial, put into a 10% by volume seawater solution containing cesium chloride (concentration of cesium chloride is 0.253 mg / ml) 80ml, followed by adding potassium ferrocyanide trihydrate aqueous solution (concentration: 100mg / ml) 0.5ml and nickel sulfate hexahydrate aqueous solution (concentration: 262.85mg / ml) 0.1ml. After reacting for 5 minutes with a seesaw shaker (model BC-700) manufactured by BIO CRAFT Co., Ltd. at room temperature, heat-responsive magnetic particles (Therma-Max, 40 mg) dispersed in 10× phosphate buffer were added. / ml, the average particle size is 100nm) 1ml, further reacted at room temperature for 30 minutes with a seesaw shaker (model BC-700) manufactured by BIO CRAFT Co., Ltd. Thereafter, the magnetic particles were collected using a 4000G neodymium magnet.

[0072] The supernatant after recovering the magnetic particles was collected, and the concentration of cesium ions before and after the reaction was measured by atomic abs...

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Abstract

The purpose of the present invention is to provide a method for removing cesium ions, whereby cesium ions present in aqueous solution can be efficiently separated and recovered within a brief period of time, while decreasing the number of manual operating steps and reducing the amount of cesium waste products. In this method for removing cesium ions, the cesium ions in an aqueous solution containing cesium are adsorbed by a water-soluble adsorbent, the water-soluble adsorbent having adsorbed the cesium ions is transformed into a water-insoluble magnetic complex in the presence of magnetic particles, and the magnetic complex is magnetically separated to remove the cesium ions in the aqueous solution.

Description

technical field [0001] The present invention relates to a method for removing cesium ions in an aqueous solution, in particular to a method for removing radioactive cesium ions from water polluted by a large amount of radioactive cesium caused by nuclear accidents and the like. Background technique [0002] as from being 137 Cs, 134 As a method for removing cesium ions from water contaminated with radioactive cesium such as Cs, there is a method of adsorbing cesium ions on zeolites such as mordenite, heteropolyacids such as ammonium phosphomolybdate, and titanium phosphate. Acidic salts of polyvalent metals such as polyvalent metals, water-insoluble ferrocyanides (ferrocyanides) and other inorganic ion exchangers and other carriers (Patent Document 1, Patent Document 2, Non-Patent Document 1). [0003] However, these carriers have low selectivity to cesium ions, and if metal ions, especially sodium ions, coexist in an aqueous solution like seawater, the adsorption capacity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/06B01D21/01B03C1/00G21F9/10G21F9/12
CPCC02F1/281C02F1/488C02F2101/006B03C1/015B03C1/00B01D21/01H01F1/445C02F2101/10B03C1/01B03C1/28G21F9/12B01D21/0009G21F9/06B03C2201/18C02F9/00C02F1/28C02F1/48C02F1/52C02F2101/20
Inventor 谢小毛畑英之大西徳幸
Owner JNC CORP
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