Preparation method of attapulgite balls for adsorption of radioactive nuclides and heavy metal ions

A technology for heavy metal ions and radionuclides, which is applied in the field of preparation of attapulgite pellets, can solve the problems of inconvenient maintenance of centrifuges, easy blockage of liquid phase discharge, and difficulty in scraping and cleaning, and achieves easy solid-liquid separation and improved adsorption energy. , the effect of less synthetic raw materials

Inactive Publication Date: 2019-10-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The solid phase after centrifugation will tightly adhere to the inner wall of the container. It is not easy to scrape off the material with a scraper, which will inevitably cause quality loss, and the maintenance of the centrifuge is inconvenient. In addition, the unscraped solid residue on the inner wall of the container is easy to block The discharge of the liquid phase will affect the subsequent centrifugation effect

Method used

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  • Preparation method of attapulgite balls for adsorption of radioactive nuclides and heavy metal ions
  • Preparation method of attapulgite balls for adsorption of radioactive nuclides and heavy metal ions

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preparation example Construction

[0027]The preparation method of the attapulgite ball which adsorbs radionuclides and heavy metal ions comprises the following steps:

[0028] (1) Put pure attapulgite in a volumetric flask, then add hydrochloric acid with a concentration of 1-7% in mass fraction, plug the bottle stopper and place it in an oven at 50-80°C for 12-24h activation, after washing at 85 Dry at -105°C for 1-2 hours;

[0029] (2) Place the dried acidified attapulgite powder obtained in step (1) in a high-temperature furnace, and roast at 300-600°C for 1-2h;

[0030] (3) Using isopropanol as the grinding medium, the attapulgite powder obtained in step (2) and alumina grinding balls are mixed by high-energy ball milling, and the mass ratio of the grinding balls to the material is 1:1.5-3.5; grinding The mass ratio of medium and material is 1:2-4, the ball milling rate is 1000-4000r / min, after the ball milling is completed, the obtained slurry is dried for 24 hours to constant weight, ground and sieved t...

Embodiment 1

[0037] The preparation method of the attapulgite ball which adsorbs radionuclides and heavy metal ions adopts the following steps:

[0038] (1) Put pure attapulgite in a volumetric flask, add hydrochloric acid with a mass concentration of 7%, stopper the bottle, place it in an oven at 70°C for 24 hours, and finally wash and dry it. The drying treatment is to burn at 105°C for 1.5h.

[0039] (2) Put the dried acidified attapulgite powder obtained in step (1) in a high-temperature furnace, and bake at 400° C. for 2 hours.

[0040] (3) Using isopropanol as the grinding medium, the attapulgite powder obtained in step (2) and alumina balls are mixed by means of high-energy ball milling. The ball milling rate is 1500r / min. After the ball milling is completed, the obtained slurry Dry for 24 hours to constant weight, grind and sieve to obtain finely ground attapulgite powder.

[0041] (4) Put the powder obtained in step (3) into N-methyl-1-pyrrolidone to stir and disperse, and then ...

Embodiment 2

[0048] The preparation method of the attapulgite ball which adsorbs radionuclides and heavy metal ions adopts the following steps:

[0049] (1) Put pure attapulgite in a volumetric flask, then add hydrochloric acid with a concentration of 5% by mass fraction, cork the bottle, place it in an oven at 60°C for 18 hours, and finally wash and dry it. The drying process is to burn at 100°C for 2h.

[0050] (2) Put the dried acidified attapulgite powder obtained in step (1) in a high-temperature furnace, and bake at 600° C. for 1.5 h.

[0051] (3) Using isopropanol as the grinding medium, the attapulgite powder obtained in step (2) and alumina balls are mixed by high-energy ball milling. The ball milling rate is 2000r / min. After the ball milling, the obtained slurry is Dry for 24 hours to constant weight, grind and sieve to obtain finely ground attapulgite powder.

[0052] (4) Put the powder obtained in step (3) into N-methyl-1-pyrrolidone to stir and disperse, then put it into an ...

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Abstract

The invention relates to a preparation method of attapulgite balls for adsorption of radioactive nuclides and heavy metal ions. The method includes steps: subjecting pure attapulgite to reaction activating under acid conditions, washing and drying, performing high-temperature calcining, subjecting obtained attapulgite powder to ball milling and screening, adding N-methyl-1-pyrrolidone and an adhesive, mixing, stirring, pushing slurry to drip into water to form the balls by adopting an injection device, jointly standing to complete substance exchange, and subjecting the obtained balls to filtration, drying and high-temperature treatment to obtain the attapulgite balls in uniform particle size. Compared with the prior art, the method has advantages of high production efficiency, short production period, simple equipment and simplicity and convenience in operation. The prepared attapulgite balls are capable of not only effectively removing the radioactive nuclides such as Sr, Cs, Co and Uin wastewater but also adsorbing the heavy metal ions such as Cu<2+>, Pb<2+> and Cd<2+> in the wastewater.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for preparing attapulgite rod pellets for adsorbing heavy metal ions and radioactive elements in nuclear wastewater. Background technique [0002] Nuclear energy is clean and efficient, and its widespread use has brought good economic and social benefits to mankind, but it has also produced a large amount of radioactive waste, threatening our health. Radioactive waste is considered to be the most dangerous environmental pollutant due to its long duration of hazards. The volume of radioactive wastewater and the radioactive substances contained in it account for a very large proportion of the total amount of radioactive waste. Therefore, how to safely and effectively treat radioactive wastewater has become a The key to the sustainable development of nuclear energy. [0003] Radioactive wastewater refers to various wastewater discharged from nuclear power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12G21F9/12B01J20/30
CPCB01J20/08B01J20/12G21F9/12
Inventor 孙序成张瑞吉郭芳威赵晓峰
Owner SHANGHAI JIAO TONG UNIV
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