全尾砂和废石联合胶结充填体最佳配比及应用

针对红岭铅锌矿分级充填骨料来源不足、地表废石堆积污染环境的情况,提出将该矿选厂产生的全尾砂和地表废石作为充填骨料的联合胶结充填方案。分别测试了全尾砂和地表废石的物理化学性质,验证了碎石和全尾砂作为联合充填骨料的可行性。通过充填配比试验,分析了不同配比全尾砂废石充填体强度特性,得出了最佳充填配比。结果表明,充填试块的强度随灰砂比减小而减小,随养护龄期增加呈增大趋势,随充填料浆质量浓度增大而增大,最佳配比为: 胶结充填灰砂比1∶8、普通充填灰砂比1∶12,全尾砂∶废石配比4∶6,质量浓度78%。根据研究结果,在红岭铅锌矿进行了全尾砂废石充填技术工业应用,证实该技术可行。

Optimum Proportion of Total Tailings and Waste Rock for Cemented Backfill and Its Practical Application

In view of problems, including insufficient source of graded backfill aggregate in Hongling Lead-Zinc Mine and pollution by the accumulation of waste rock on the ground surface, it is proposed that the total tailings from processing plant together with the waste rock be taken as aggregate for cemented backfilling. The physicochemical properties of the tailings and the waste rock on the ground surface were tested respectively, which verified that a combination of two materials taken as backfill aggregate was feasible. Then, based on the proportioning tests for the cemented backfill to analyze the strength of backfill with different ratio of total tailings to waste rock, an optimal proportioning scheme was finally determined. The results show that the strength of the backfill sample in the test decreases with the decreasing of the cement-sand ratio, and increases as prolonging the curing age and increasing the mass concentration of the backfill slurry. It is finally concluded that the optimal parameters include a cement-sand ratio of 1∶8 for cemented backfill, a cement-sand ratio of 1∶12 for normal backfill, with the total tailings and the waste rock in the proportion of 4∶6 and the mass concentration of 78% for both backfill. Based on the research results, such kind of backfilling technology using total tailings together with waste rock has been successfully applied in Hongling Lead-Zinc Mine, which has proven the feasibility of such technology.