工业废渣协同水泥固化放射性独居石废渣的配比与机理研究

Abstract

Abstract: Cement powder, fly ash, slag powder, and lime were used as curing materials to immobilize radioactive monazite waste. A 4-factor 3-level orthogonal experiment was conducted to study the variation patterns of unconfined compressive strength, uranium (U) and thorium (Th) leaching rates, freeze-thaw resistance, and acid neutralization capacity under different mix ratios. The optimal curing ratio was selected through fuzzy optimization theory, with curing mechanisms analyzed via XRD, FTIR, and SEM. Experimental results demonstrated that the slag-to-curing material ratio had the greatest impact on unconfined compressive strength and freeze-thaw resistance, while fly ash dosage significantly affected U leaching toxicity. All factors showed similar impacts on acid neutralization capacity, whereas Th leaching toxicity remained relatively unaffected. Using unconfined compressive strength, U leaching rate, freeze-thaw cycles, acid neutralization capacity, and curing cost as fuzzy optimization indicators,It is concluded through the fuzzy optimization that when the content of fly ash is fixed at 15%, the content of slag is in the range of 15%~25%, the content of lime is in the range of 2.5%~5.0%, and the slag-solid ratio is in the range of 1.0~1.4, the solidified body meet the requirements specified in Performance Requirements for Solidified Forms of Low and Intermediate Level Radioactive Waste-Cement Solidified Forms (GB 14569.1—2011)with a reasonable treatment cost.Post-curing treatment resulted in pore elimination, structural densification, and enhanced strength in the monazite waste solidification body.

Key words: radioactive monazite waste residue, solidification, orthogonal test, fuzzy optimization, mechanism analysis

CLC Number:

TL942+.1

GAO Yang, SUN Juan, LIU Xiaochao, LIU Yanmei, WU Shangwen, AN Yifu. Study on the proportioning and mechanism of industrial waste residue synergistic cement solidification of radioactive monazite waste residue[J].RADIATION PROTECTION, 2026, 46(1): 47-57.

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Study on the proportioning and mechanism of industrial waste residue synergistic cement solidification of radioactive monazite waste residue

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