某矿全尾砂胶结充填物料性能研究

某矿现有分级尾砂充填系统效率低、尾砂供应不足、工艺复杂。对该矿全尾砂作为充填骨料的可行性进行研究，配制浓度为66%、68%、70%和72%，灰砂比为1∶4、1∶8、1∶12的全尾砂胶结充填物料，并检测物料的沉降、渗透、凝结、强度等性能。检测表明，全尾矿孔隙率为39.71%，自然安息角为40°，平均粒径为0.049 7 mm，尾砂较细。试验结果表明，料浆的沉降作用产生的泌水率为6.39%~23.76%，浓度提高幅度为1.81%~8.77%，渗透速度为0.25~0.36 cm/h；灰砂比1∶4时，充填料浆终凝时间为26.2~23.9 h；灰砂比1∶8时，终凝时间41.4~40 h，初终凝时间差不超过2 h；各组胶结料浆塌落度为24.9~26.8 cm，流动性较好。各组试样28 d强度在0.38~1.9 MPa，且浓度、水泥量与强度呈正相关的关系。结合矿山采矿方法对凝结时间、强度等的要求，推荐配比为灰砂比1∶8，浓度70%~72%。研究成果可为同类矿山全尾砂胶结充填物力学性能的确定提供参考。

Study on the Properties of the Unclassified Tailings Cemented Backfill Materials in a Mine

The backfill system with classified tailings in a mine was in low efficiency with its complex process and the supply shortage of tailings.The test on tailings parameters was carried out,the four concentration sample slurry(66%,68%,70% and 72%)were prepared with 3 different dosage of cements(1∶4,1∶8,1∶12)for the capability test of settlement,infiltration,concretion and strength.The results show that the physical characteristics of the tailings were the porosity 39.71%,natural rest angle 40°,average particle size 0.0497 mm,the tailings were finer,the water effusion rate by settlement was 6.39%~23.76%,and concentration increased by 1.81%~8.77%;Penetration speed of 0.25~0.36 cm/h;When cements dosage is 25%,the final concreted time of 26.2~23.9 h;while 12.5%,the concreted time of 41.4~40 h,the final concreted time does not exceed 2 h;the slump height of all samples were 24.9~26.8 cm,the slurry can flow better.The 28 d uniaxial compressive strength were 0.38~1.9 MPa.And the UCS was positive related with slurry concentration,the cements dosage.the suggested ratio was 12.5% cements dosage,backfill concentration was 70%~72% according to the require of mining methods on the concretion time and UCS.The results in the paper was coming to a standard for the determination of cemented fillings slurry performance made by unclassified tailings in similar mines.