Method for treating radioactive strontium by using sodium manganate adsorbent

A technology of sodium manganese silicate and adsorbent, which is applied in the field of radioactive water treatment, can solve the problems such as the adsorption rate and adsorption capacity of the adsorbent is not particularly good, and achieve the effects of outstanding adsorption effect, mild conditions and low price.

Active Publication Date: 2021-06-22
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the adsorption rate and adsorption capacity of the obtained adsorbent are not particularly good

Method used

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  • Method for treating radioactive strontium by using sodium manganate adsorbent
  • Method for treating radioactive strontium by using sodium manganate adsorbent
  • Method for treating radioactive strontium by using sodium manganate adsorbent

Examples

Experimental program
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Embodiment 1

[0036] Take beaker 1, first weigh 5.68g Na 2 SiO 3 9H 2 O add 30ml water, stir to let Na 2 SiO 3 9H 2 O fully dissolved; take another beaker 2, weigh 1.23g Mn(CH 3 COOH) 2 4H 2 O, add 20ml water, stir to make Mn(CH 3 COOH) 2 4H 2 O is fully dissolved; then Mn(CH 3 COOH) 2 4H 2 Pour the O solution into beaker 1, stir it evenly, put it into a 100ml polytetrafluoroethylene-lined hydrothermal reaction kettle, react at 220°C for 40h, and after cooling at room temperature, centrifuge at 6000rpm for 3min three times or suction filter at 70°C Dry to get Na 2 mn 2 Si 3 o 8 .

[0037] The sodium manganese silicate XRD that present embodiment obtains, as figure 1 . like figure 2 Its chemical composition is analyzed by energy spectrum, which is composed of Si, Mn, O and Na elements. Chemical formula close to Na 2 mn 2 Si 3 o 8 . The obtained sodium manganese silicate adsorbent is used to adsorb strontium ions in water. Add 0.5g / L manganese sodium silicate adsor...

Embodiment 2

[0039] First weigh 0.5g NaOH and 4.68g NaCl into beaker 1, add 30ml of water, stir to fully dissolve NaOH and NaCl, then weigh 5.68g NaCl 2 SiO 3 9H 2 Pour O into NaOH, NaCl solution, take another beaker 2, weigh 1.23g Mn(CH 3 COOH) 2 4H 2 O, add 20ml water, stir to make Mn(CH 3 COOH) 2 4H 2 O is fully dissolved, and then Mn(CH 3 COOH) 2 4H 2Pour the O solution into beaker 1, stir it evenly, put it into a 100ml polytetrafluoroethylene-lined hydrothermal reaction kettle, react at 220°C for 40h, and dry it at 70°C after centrifugation or suction filtration to obtain Na 2 mn 2 Si 3 o 8 .

[0040] The sodium manganese silicate XRD that present embodiment obtains, as image 3 . like Figure 4 Its chemical composition is analyzed by energy spectrum, which is composed of Si, Mn, O and Na elements. Chemical formula close to Na 2 mn 2 Si 3 o 8 . The obtained sodium manganese silicate adsorbent is used to adsorb strontium ions in water. Add 0.5g / L manganese sodium...

Embodiment 3

[0042] First weigh 2.34g NaCl into beaker 1, add 30ml of water, stir to fully dissolve NaCl, then weigh 5.68g NaCl 2 SiO 3 9H 2 Pour O into the NaCl solution, take another beaker 2, and weigh 1.23g MnCl 2 4H 2 O, add 20ml of water, stir to let MnCl 2 4H 2 O is fully dissolved, and then the MnCl 2 4H 2 Pour the O solution into beaker 1, adjust the pH to 12.7-13.0 with NaOH, stir evenly, put it into a 100ml polytetrafluoroethylene-lined hydrothermal reaction kettle, react at 180°C for 40h, centrifuge or filter it in Dry at 70°C to get Na 2 mn 2 Si 3 o 9 .

[0043] The sodium manganese silicate adsorbent obtained in this example is spherical. Its chemical composition is analyzed by energy spectrum, which is composed of Si, Mn, O and Na elements. Chemical formula close to Na 2 mn 2 Si 3 o 9 . The obtained sodium manganese silicate adsorbent is used to adsorb strontium ions in water. Add 0.5g / L manganese sodium silicate adsorbent to the solution containing 10mg / L...

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Abstract

The invention discloses a preparation method and an application method of sodium manganate. The method comprises the following steps: adding sodium hydroxide, sodium chloride and sodium silicate into water, and dispersing manganese salt into the water; stirring, transferring into a hydrothermal kettle, carrying out hydrothermal reaction, washing with water, filtering, and drying to obtain the target product sodium manganate, wherein the molar ratio of manganese to silicon is 0.25-1. The prepared sodium manganate can be used as an inorganic ion adsorbent, and has relatively strong adsorption capacity on strontium in radioactive wastewater. The sodium manganate prepared by the method has high selectivity, adsorption capacity, mechanical property and irradiation resistance on strontium ions in radioactive wastewater, so that the strontium ions in the radioactive wastewater can be effectively removed.

Description

technical field [0001] The invention belongs to the technical field of radioactive water treatment, and in particular relates to a preparation method of a sodium manganese silicate adsorbent for absorbing radioactive strontium, a sodium manganese silicate adsorbent and a water treatment method. Background technique [0002] During the development and utilization of the nuclear industry, a large amount of radioactive waste water is produced. Radioactive strontium ( 90 Sr) is a common radionuclide with a half-life of 28.6 years. 90 Sr will accumulate into the human body through the food chain, produce internal radiation, and cause pathological changes. Seriously affect the ecological environment and human health. 90 Sr usually exists in water as ions, so removing Sr from water 2+ is an urgent problem to be solved. [0003] At present, at home and abroad, the removal of Sr from the low-level strontium-containing waste liquid discharged in the production process of the nucl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30C01G45/12C02F1/28G21F9/12
CPCB01J20/10C01G45/12C02F1/281G21F9/12C02F2101/006B01J2220/4806C01P2002/72C01P2002/80
Inventor 曾宪海沈志良曹留烜孙勇唐兴林鹿
Owner XIAMEN UNIV
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