微生物矿化改善尾矿砂性质的试验研究

发布时间：2018-03-23 15:11

本文选题：尾矿砂　切入点：微生物矿化　出处：《工业建筑》2016年06期

【摘要】：尾矿砂中重金属的固定可减轻对周围环境的污染,且尾矿砂力学性质的改善有助于提高坝体稳定性或库容。微生物矿化技术(MIM)不仅可以提高尾矿砂的力学性质,同时还可以固定重金属。对取自湖南和广西的两种尾矿砂(含较多Cu和As等元素)进行了微生物诱导砂柱胶凝试验,研究微生物矿化对尾矿砂力学性质及重金属离子溶出的影响,并比较这两种尾矿砂处理后的差异。结果表明:经MIM处理后,As、Mo和Mn的溶出减少,尾矿砂的压缩波波速和单轴无侧限抗压强度均有较大提高。
[Abstract]:The immobilization of heavy metals in tailings can reduce the pollution to the surrounding environment, and the improvement of mechanical properties of tailings can help to improve the stability or reservoir capacity of the dam. The microbial mineralization technique can not only improve the mechanical properties of tailings. Two kinds of tailings from Hunan and Guangxi (containing more Cu and as) were tested by microorganism induced sand column cementation. The effects of microbial mineralization on the mechanical properties of tailings and the dissolution of heavy metal ions were studied, and the differences between the two kinds of tailings were compared. The results showed that the dissolution of As-Mo and mn decreased after MIM treatment. The compression wave velocity and uniaxial unconfined compressive strength of tailings have been greatly improved.
【作者单位】：清华大学土木工程系;
【分类号】：TD926.4;Q939.97

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