某矿山全尾砂似膏体充填配比试验研究

某矿山目前采用立式砂仓自然沉降后的粗粒级尾砂进行自流胶结充填,存在充填体泌水量较大,凝固时间长,强度低等问题。针对该矿山现有充填方式存在的问题,结合膏体充填的优势,开展了该矿山尾砂似膏体充填配比试验研究。主要对该矿山全尾砂和分级尾砂进行了物化性质分析,在此基础上开展了全尾砂和分级尾砂似膏体充填配比试验研究,对比分析了2种尾砂充填体的坍落度、泌水率以及单轴抗压强度等指标,结合矿山生产对充填体强度的要求,确定满足生产要求的最佳配比。研究结果表明:充填骨料采用全尾砂较分级尾砂效果好,全尾砂充填体强度能满足矿山生产需要,并根据矿山生产实际,提出了全尾砂似膏体充填配比方案。

Experimental Study on the Whole Tailings Paste-like Backfilling Ratio in a Mine

At present,the coarse tailings from vertical tailings silos after free settling in a mine are used to realize self-flow cemented filling.There exist such problems as large amounts of bleeding at filling body,long solidification time and low strength in backfilling process.Aiming at the problems existing in the current filling method of the mine,and combining with the advantages of paste backfilling，the tailings paste-like backfilling ratio tests were carried out.The physical and chemical properties of the whole tailings and the classified tailings were mainly analyzed.On the basis of this,the experimental research on the paste-like backfilling ratio of the whole tailings and the classified tailing was carried out to contrast and analyze their index on slump,bleeding rate and uniaxial compressive strength.Combined with the requirements for the strength of the filling body in the mine production,the optimal matching scheme of backfilling to meet the production requirements is determined.The result shows that the whole tailings backfilling has a better effect than that of the classified tailings,and its strength can meet the needs of mine production.According to the actual mine production,the optimal matching scheme of the whole tailings paste-like backfilling is proposed.