微生物矿化改善尾矿砂性质的试验研究  

EXPERIMENTAL STUDY OF THE IMPROVEMENT OF THE PROPERTIES OF THE TAILING BY BIOMINERALIZATION

作　　者：陈溪海 郭红仙[1] 程晓辉[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《工业建筑》2016年第6期94-98,176,共6页Industrial Construction

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。The immobilization of the heavy metal in the tailings can reduce the environmental pollution,and the improvement of the mechanical properties of tailing can enhance the stability of the tailing dam or the capacity of tailing pond. The biomineralization（ MIM） technology can not only improve the mechanical properties of tailing significantly but also immobilize the heavy metal at the same time. The sand column cementation experiments induced by bacteria liquid were done for two kinds of tailings,one was from Hunan Province,the other was from Guangxi Province（ both contained much Cu,As,and other elements）. The purpose of the experiment was to explore the influence on the mechanical properties and the dissolution of the heavy metals. In addition,the differences of the mechanical properties＇ improvement between different kinds of tailings were considered. The results of experiment showed that after MIM treatment,the dissolution of As,Mo and Mn reduced,and the P-wave velocity and unconfined uniaxial compressive strength were improved greatly.

关 键 词：尾矿砂 微生物矿化 重金属 压缩波波速 单轴无侧限抗压强度 

分 类 号：TD926.4[矿业工程—选矿] Q939.97[生物学—微生物学]