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A kind of preparation method of magnetic uranium adsorbent

An adsorbent and magnetic technology, which is applied in the field of preparation of magnetic hydrated calcium silicate uranium adsorbent materials, can solve the problem of uneven distribution of magnetic particles, no reports of magnetic hydrated calcium silicate uranium adsorbents have been found, and the influence of hydrated calcium silicate Structure and morphology and other issues, to achieve the effect of excellent adsorption performance, fast adsorption speed, and large adsorption capacity

Inactive Publication Date: 2015-08-05
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the simple method of doping magnetic media has problems such as uneven distribution of magnetic particles, and the combination of magnetic particles and silicon sources affecting the structure and morphology of hydrated calcium silicate.
Therefore, although magnetic separation technology has been widely used in the separation of adsorbents and solvents, so far we have not found any reports on magnetic hydrated calcium silicate-based uranium adsorbents.

Method used

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  • A kind of preparation method of magnetic uranium adsorbent
  • A kind of preparation method of magnetic uranium adsorbent

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Effect test

Embodiment 1

[0018] (1) 0.2g of Fe with an average particle size of less than 300nm 3 o 4 (50-80emu / g) into 0.080-0.095M80mL HCl ultrasonic (20-40KHz) 15-30min, magnetic separation, wash with deionized water until neutral, pour out deionized water, add 40mL deionized water and 160mL anhydrous Ethanol, under ultrasonic (20-40KHz) and stirring conditions, add 2mL of 28% ammonium hydroxide solution, further dropwise add 0.28-0.30mmol ethyl orthosilicate, stir for 7-10h, magnetic separation, 50-100mL deionized water Wash 3-5 times to obtain the intermediate.

[0019] (2) The preparation process of this step is completed under ultrasonic (20-40KHz) and stirring conditions, and 200mL of 15-30mmol / L Ca(NO 3 ) 2 Solution, 10-30min, add 1mL of 1M NaOH solution, drop 4.00-4.50mmol ethyl orthosilicate in 20-200min, react for 30min, magnetically separate, wash 3-5 times with 50-100mL deionized water to obtain magnetic adsorbent .

[0020] (3) Place the sample in a freezer, freeze at -40--80°C for...

Embodiment 2

[0023] The preparation method of the uranium adsorbent of embodiment 2 is basically the same as that of embodiment 1, and the difference is: step (1) 0.2g average particle diameter is less than 300nm Fe 3 o 4 (40-80emu / g) into 0.095M80mL HCl ultrasonic (20KHz) 15-30min, magnetic separation, washed with deionized water until neutral, deionized water, add 40mL deionized water and 160mL absolute ethanol, in ultrasonic (20KHz) and stirring condition, add 2mL of 28% ammonium hydroxide solution, further dropwise add 0.29mmol ethyl orthosilicate, stir for 7h, magnetically separate, wash 5 times with 50mL deionized water to obtain the intermediate.

Embodiment 3

[0025] The preparation method of the uranium adsorbent of embodiment 3 is basically the same as that of embodiment 2, the difference is: step (2) the preparation process of this step is completed under ultrasonic (40KHz) and stirring conditions, and 200mL22mmol / L of Ca is added to the intermediate (NO 3 ) 2 Solution, 10min, add 1mL of 1M NaOH solution, add 4.50mmol ethyl orthosilicate dropwise within 30min, react for 30min, magnetically separate, wash 5 times with 50mL deionized water, and obtain a magnetic adsorbent.

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Abstract

The invention provides a method for preparing a magnetic uranium adsorbent and belongs to the technical field of methods for preparing uranium adsorbing materials. The method comprises the following steps: (1) adding 0.2 g of Fe3O4 (40-80 emu / g) into ionized water and absolute ethanol, and adding ammonium hydroxide and ethyl orthosilicate under ultrasonic and agitating conditions to obtain an intermediate; (2) after adding Ca (NO3)2 and NaOH into the intermediate A under ultrasonic and agitating conditions, adding ethyl orthosilicate within 20-200 mins to obtain a magnetic adsorbent; (3) freeze-drying the magnetic adsorbent. The prepared adsorbing material is easily separated from a solution, the adsorbing performance is excellent, and the advantages of high adsorbing speed and large adsorbing capacity are represented in a wider temperature range, at different original initial concentrations and in different acid-base environments.

Description

technical field [0001] The invention relates to a preparation method of uranium adsorption material, in particular to a preparation method of magnetic hydrated calcium silicate uranium adsorption material. Background technique [0002] Nuclear energy is an important way to solve the energy shortage in the world today. However, with the rapid development of the nuclear industry, more and more radioactive waste water containing uranium is produced. Due to the half-life of uranium, high radioactivity and biological toxicity, industrial wastewater containing uranium has become a long-term potential environmental hazard. Calcium silicate hydrate is an important raw material for uranium-containing industrial wastewater treatment. This type of material has very good uranium adsorption under neutral and alkaline conditions. According to reports (Radiochim.Acta92(2004) 645): hydrated silicon The adsorption distribution ratio of calcium carbonate to uranium is between 30000-150000L / k...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/30C01G43/00
Inventor 张宏森丁慧贤白云起杨德智赵桂红薛丽梅闫慧君程玲玲
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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