Solidification of uranium tailings using alkali-activated slag mixed with natural zeolite

Wang Fulin; Zhou Min; Chen Cheng; Yuan Zhengping; Geng Xinyang; Yang Shijiao

doi:10.1016/j.net.2022.10.015

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자료유형: 학술저널

저자정보: Wang Fulin (School of Resource & Environment and Safety Engineering University of South China) Zhou Min (School of Resource & Environment and Safety Engineering University of South China) Chen Cheng (School of Resource & Environment and Safety Engineering University of South China) Yuan Zhengping (School of Resource & Environment and Safety Engineering University of South China) Geng Xinyang (School of Resource & Environment and Safety Engineering University of South China) Yang Shijiao (School of Resource & Environment and Safety Engineering University of South China)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제55권 제2호

발행연도: 2023.2

수록면: 524 - 530 (7page)

DOI: 10.1016/j.net.2022.10.015

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Cemented uranium tailings backfill created from alkali-activated slag (CUTB) is an effective method of disposing of uranium tailings. Using some environmental functional minerals with ion exchange, adsorption, and solidification abilities as backfill modified materials may improve the leaching resistance of the CUTB. Natural zeolite, which has good ion exchange and adsorption characteristics, is selected as the backfill modified material, and it is added to the backfill materials with cementitious material proportions of 4%, 8%, 12%, and 16% to prepare CUTB mixtures with environmental functional minerals. After the addition of natural zeolite, the uniaxial compressive strength (UCS) of the CUTB decreases, but the leaching resistance of the CUTB increases. When the natural zeolite content is 12%, the UCS reaches the minimum value of 8.95 MPa, and the concentration of uranium in the leaching solution is 0.28e8.07 mg/L, the leaching rate R42 is 9.61 10 7 cm/d, and cumulative leaching fraction P42 is 8.53 10 4 cm, which shows that the alkali-activated slag cementitious material has a good curing effect on the CUTB, and the addition of environmental functional minerals helps to further improve the leaching resistance of the CUTB, but it reduces the UCS to an extent.

#Uranium tailings #Natural zeolite #Cemented backfill #Uniaxial compressive strength #Leaching resistance

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