尾矿库高浓度输送低浓度排放新工艺

New Method of High-concentration Transport and Low-concentration Discharge in Tailings Reservoir

根据尾矿库的运行状况和现有放矿条件,创新性的将原来的高浓度排放工艺进行改进,实现尾矿的高浓度输送低浓度排放。通过尾矿高浓度排放流槽试验与库区尾矿低浓度排放进行对比分析,证明低浓度排放比高浓度排放颗粒的分选效果更好。再分别对两种放矿模式下50m处的尾矿进行固结计算,发现稀释之后的尾矿在一定周期内基本完全固结,而高浓度排放则固结欠佳。进一步做了坝体稳定性计算,在完全固结的情况下,高浓度排放的抗剪强度指标不能满足坝体稳定性的要求,低浓度的计算结果则偏于安全。试验和计算验证了低浓度排放工艺的可行性和优越性。

According to the operation status and existing discharge condition of tailings reservoir, the original high-con- centration discharge was innovatively improved to realize the high-concentration transport and low-concentration discharge. Compared with the sluice tests of original discharge, it proved that the low-concentration discharge had better separation effect. Then, the consolidation calculations of tailings in 50 m location were conducted under the two discharge ways. It found that the tailings after dilution was fully consolidated in a certain cycle, but high-concentration discharge had poor consolidation. Furthermore, the dam stability calculation was carried out. Under the complete consolidation, shear strength of high-concentration discharge can＇t meet the requirement of dam stability, but the results of low-concentration discharge were safe. The tests and calculation verified the feasibility and superiority of the low-concentration discharge.