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某矿全尾砂胶结充填物料性能研究

ISSN号：1001-1250
期刊名称：《金属矿山》
时间：0
分类：TD853.343[矿业工程—金属矿开采;矿业工程—矿山开采]
作者机构：[1]中国瑞林工程技术有限公司, [2]北京科技大学土木与环境工程学院, [3]铜陵有色金属集团股份有限公司冬瓜山铜矿
相关基金：长江学者和创新团队发展计划项目（编号：IRT0950）; 国家自然科学基金重点项目（编号：50934002）

关键词：全尾砂, 胶结充填, 充填体性能, 适应性, Unclassified tailings, Cemented filling, Fillings performance, Adaptability

中文摘要：

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%6、8%、70%和72%,灰砂比为1∶4、1∶81、∶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41.4～40h,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0.38～1.9MPa,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。

英文摘要：

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 railings were the porosity 39.71% , natural rest angle 40%, average particle size 0. 0497 mm, the railings were finer, the water effusion rate by settlement was 6. 39%0 - 23.76% ,and concentration increased by 1.81% - 8.77%0 ; 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 resuhs in the paper was coming to a standard for the determination of cemented fillings slurry performance made by unclassified tailings in similar mines.

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