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Method for treating acidic uranium-bearing wastewater with bone-based adsorbent

A technology for adsorbent and radioactive wastewater, applied in radioactive purification, nuclear engineering, etc., can solve the problems of low uranium adsorption capacity, unsatisfactory removal rate, large amount of adsorbent, etc., to achieve large adsorption capacity, easy control, The effect of less residue

Inactive Publication Date: 2015-04-22
EAST CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These uranium adsorbents have the following disadvantages: (1) The uranium adsorption capacity is low, the dosage of the adsorbent is large, and the removal rate is not ideal, so it is only suitable for the treatment of low-concentration radioactive wastewater; (2) The applicable adsorption pH value is close to the medium nature, most of the wastewater needs to be neutralized before treatment

Method used

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  • Method for treating acidic uranium-bearing wastewater with bone-based adsorbent
  • Method for treating acidic uranium-bearing wastewater with bone-based adsorbent

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Experimental program
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Effect test

Embodiment 1

[0022] Adsorbents are commercially available bone charcoal (calcination temperature is 1200°C, particle size is 100 mesh) and activated carbon (particle size is 100 mesh), the dosage of adsorbent is 0.02-4.0g / L, adsorption temperature is 20°C, stirring The intensity and time are 400rpm and 3.0h respectively, the effects of bone charcoal and activated carbon on treating uranium-containing wastewater are as follows: figure 1 shown. The results show that: when the dosage of bone charcoal is only 0.2g / L, the removal rate of uranium in wastewater exceeds 99.0%, while the removal rate of activated carbon is only 12.7%, even when the dosage of activated carbon is as high as 4g / L, The removal rate of uranium is only 76.4%.

Embodiment 2

[0024] The adsorbent is commercially available bone meal (particle size: 100 mesh), the dosage of the adsorbent is 0.5g / L, the adsorption temperature is 20°C, the stirring intensity and time are 400rpm and 2.0h respectively, and the removal rate of uranium in the wastewater reaches 98.5%.

Embodiment 3

[0026] The adsorbent is commercially available black bone meal (calcination temperature is 1000°C, particle size is 100 mesh), the dosage of adsorbent is 0.2g / L, the adsorption temperature is 20°C, the stirring intensity and time are 400rpm and 2.0h respectively, The removal rate of uranium in wastewater reaches 99.2%.

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Abstract

The invention discloses a method for treating acidic uranium-bearing wastewater with a bone-based adsorbent, which belongs to the technical field of wastewater treating process. The method comprises the following steps: adding the bone-based adsorbent into radioactive wastewater, wherein the bone-based adsorbent accounts for 0.01 to 5.0% of the radioactive wastewater by mass; and then carrying out stirring and settling or filtering so as to remove the adsorbent, thereby removing uranium ions in the wastewater. If it takes long time for natural settling, polymeric flocculant can be added to shorten solid-liquid separation time. The method has the advantages of simple process, easy controllability, a small usage amount of the adsorbent and a high uranium removal rate; the bone-based adsorbent is widely available, cheap, green and environment-friendly, enables the waste to be turned into the valuable and does not produce secondary pollution; and solution acidity required in the method is identical to acidity of actual radioactive wastewater, so adjustment of acidity is not needed.

Description

technical field [0001] The invention relates to a method for treating acidic uranium-containing wastewater by using a bone matrix adsorbent, and belongs to the technical field of wastewater treatment technology. Background technique [0002] A large amount of radioactive wastewater will be produced in the nuclear fuel cycle processes such as uranium mining, hydrometallurgy, use and reprocessing. As an important radioactive element, uranium will release α-rays, causing radioactive radiation damage to the human body; it will eventually enter the human body through drinking water (about 64% of the total intake) and the food chain, as a heavy metal with both chemical toxicity and radiotoxicity , pose a potential threat to human survival and development. Therefore, how to deal with uranium-containing wastewater reasonably and effectively has been paid more and more attention. [0003] The existing treatment technologies for uranium-containing wastewater at home and abroad can b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/12
CPCG21F9/12
Inventor 张志宾曹小红刘云海花榕王玲钰
Owner EAST CHINA UNIV OF TECH
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