碳酸盐矿化细菌产生碳酸钙胶结—固化铀尾矿渣研究  

Study on Cementing-solidification Uranium Tail Slag by CaCO_3 Produced by Carbonate Mineralization Bacteria

作　　者：雷佳 蒋伟言 邱天力 胡佐文[2] 段涛 竹文坤 

机构地区：[1]核废物与环境安全国防重点学科实验室,四川绵阳621010 [2]中国工程物理研究院,四川绵阳621900

出　　处：《金属矿山》2016年第8期174-179,共6页Metal Mine

基　　金：国防学科重点实验室开放基金项目(编号:14ZXNK02);中国工程物理研究院培训中心项目(编号:2014ZX01)

摘　　要：传统铀尾矿渣的处理方法存在高能耗、高排放、对周边环境影响大、维护费用高等问题,为此,考察了巴氏芽孢杆菌诱导沉积碳酸钙对铀尾矿渣的胶结效果。结果表明:添加巴氏芽孢杆菌可以有效胶结铀尾矿渣;菌液对粗粒铀尾矿渣的胶结效果好于对细粒的胶结效果;胶结后的铀尾矿渣间隙中填充的Ca CO3形成大小不一的球状聚集体,属方解石类型。对胶结体进行抗压强度测定表明:随着胶结时间的延长,胶结体的抗压强度逐渐提高;生物法胶结的砂柱受到压缩时,是从两端起逐步被破坏;粗砂形成的胶结体的抗压强度明显高于细砂,装填高度越高抗压强度越强,碳纳米管的加入可以显著提高胶结体的抗压强度。Aiming at the problems of high energy consumption,high emission,large impact on the surrounding environment,high maintenance cost in traditional uranium tail slag processing methods,the cementing effect of Bacillus Pasteurii induce deposition on calcium carbonate uranium tail slag was studied. Results indicated that,adding Bacillus Pasteurii can efficiently cement uranium tail slag. Bacteria liquid uranium cementing effect on coarse tail slag is better than on fine grained cement. The interval between cemented uranium tails slag are filled with CaCO_3,which forms of different sizes of spherical aggregates,belongs to calcite type. The compressive strength on cementing body analysis results show that,as the consolidation time extension,compressive strength of cementing body gradually improves,when biological cementation sand column was compressed,it＇ s broken from the both ends of cementing body. Compressive strength of coarse sand was obviously higher than that of the fine sand,and higher the filling,the higher the compressive strength. adding carbon nanotubes can markedly increase the compressive strength of the cement.

关 键 词：巴氏芽孢杆菌 铀尾矿渣 胶结体 

分 类 号：TD926.4[矿业工程—选矿]