多雨地区尾矿膏体地表排放的研究与应用

尾矿膏体地表排放相对于传统的尾矿坝排放有很大的优势,但由于这种方法在对气候条件(雨水、大风)比较敏感,从而大大限制了其应用范围,因此将地表膏体排放应用到多雨地区具有重要的工程意义。印度尼西亚某铁矿项目,采用膏体地表排放的方式处理尾矿。通过室内强度试验和模拟冲刷试验论证了该方法的可行性。为了抵抗雨水的冲刷,在尾矿膏体中加入一定量的固化剂,使其尽可能早地具有一定强度。通过强度试验给出了优化的固化剂配方,模拟雨水冲刷试验表明膏体固化6 h后将能够抵抗当地极端降雨条件下的冲刷。试验中发现黏土矿物质可以作为提高膏体早期强度的固化剂,但其作用机理比较复杂,尤其是与在水泥基固化剂共同作用的情况下,值得进一步研究。

Research and Application of Surface Paste Dispose for Iron Tailings in Rainy Climate

Surface paste disposal of waste tailings has great advantage compared to the traditional tailings dispose means (a setting pond or a dam), however, its application range is limited because of the bad adaptation in climate. So it is significant in engineering to realize the application of surface paste disposal in rainy climate areas. This paper discuses the application of Surface paste disposal method for waste tailings of an iron mine project in Indonesia and demonstrates its feasibility by laboratory tests including unconfined compression strength test and rainfall erosion test. Adding binder to tailings paste to make it obtain a certain strength as soon as possible to resist rainfall erosion. Authors decide the optimal binder formula and verify that the tailings paste with binder curing for 6 hours can withstand the local extreme rainfall erosion. Clay mineral is helpful increasing the paste early-age strength as a part of binder, and its bind mechanism is complicate, worth to further study.