尾砂胶结充填对井下水环境影响评价

为准确了解充填体充填至采空区对井下水环境的影响,进行室内充填体试块的泌水和有毒有害物质浸出试验。以某有色金属矿现有充填方式为例,选取充填料浆浓度78%,充填配比水泥∶粉煤灰∶跳汰砂=1∶1∶10的充填体进行试验。试验结果表明:充填体对井下水环境影响不大;充填料浆泌水自身污染物成分均不高,混入井下涌水后对其水质影响较小,主要污染物成分基本不变;浸出试验中有毒有害物质增加,但考虑试验周期长(20 d),对井下水环境的影响可以忽略。

Evaluation of the effect of tailings cement filling on the underground water environment

In order to accurately understand the effect of filling body on the underground water environment,laboratory tests on the bleeding of backfill specimens and the leaching of toxic substances were conducted.The paper took the present filling manner in a nonferrous metal mine as the research subject and carried out experiments on the filling body with the filling pulp concentration of 78 % and the cement∶coal ash∶jigging tailings ratio of 1∶1∶10.The results show that the filling body has little effect on underground water environment;the filling pulp bleeding itself has low pollutant content and when mixed with underground influx,has little effect on water quality due to little change in pollutant compositions;hazardous substance content increases in leaching experiment,however,taking into consideration the experiment cycle(20 d),the effect on underground water environment is negligible.