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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。
The fixing of heavy metals in the tailing sand can reduce the pollution to the surrounding environment, and the improvement of the mechanical properties of the tailings sand helps to improve the stability or storage capacity of the dam body. Microbial mineralization (MIM) can not only improve the mechanical properties of tailings, but also fix heavy metals. Microbial induced sand column gelation tests were carried out on two kinds of tailings sand (containing more Cu and As) from Hunan and Guangxi to study the effect of microbial mineralization on the mechanical properties of tailings sand and the dissolution of heavy metal ions Differences between two kinds of tailing sand treatment. The results show that after MIM treatment, the dissolution of As, Mo and Mn decreases, and the velocity of compression wave and the unconfined uniaxial compressive strength of tailing sand increase greatly.