期刊论文

Remediation of uranium contaminated soil with three combinated stabilizers

中文

精细化工

1003-5214

2020

37

10

2105-2111

10.13550/j.jxhg.20200350

51174117:国家自然科学基金 15K106:湖南省教育厅科研平台项目 17K078:湖南省创新平台开放基金

本校为第一机构

采用纳米沸石、磷酸二氢钾、改性生物炭联合对铀尾矿库中的核素铀进行化学固定,并利用毒性浸出实验(TCLP)和Tessier逐级化学提取法,研究了固定前后铀的浸出特性与形态变化。TCLP结果表明,添加不同固定剂培养30 d后,与对照组相比,土壤中铀的浸出量减少了42.13%~71.54%,且土壤pH与TCLP提取态铀含量存在显著的负相关关系。Tessier结果显示,施用不同固定剂后,土壤中可交换态和碳酸盐结合态铀质量分数分别降低7.38%~26.06%、1.43%~6.99%,而有机质结合态、铁锰氧化物结合态、残渣态铀比例分别增加2.56%~ 3.64%、2.71%~17.47%、4.07%~11.12%。在单一固定材料实验中,纳米沸石添加量为6%(以土壤质量计,下...

The nuclide uranium in uranium tailings pond was chemically fixed by nanozeolite, potassium dihydrogen phosphate and modified biochar. And the leaching characteristics and morphological changes of uranium in soil before and after modification treatment were determined by toxicity characteristic leaching procedure (TCLP) and Tessier stepwise chemical extraction. TCLP results showed that after 30 days of solidification with different stabilizers, the amount of uranium leaching from soil decreased by 42.13%~ 71.54% compared with that of the contro...