ABSTRACT

This research elucidates the geochemical behaviour of cemented paste backfill (CPB) of sulphide-rich tailings (S-rT). The dynamic-tank leaching test was performed on the CPBs for up to 360 days. The CPBs with the alkaline industrial by-products (AIPs) produced relatively lower acidity, Ec and SO₄^2- than the Control. The AIPs replacement appeared to considerably mitigate the release of heavy metals (HMs) including As. Only Mo and As in CPBs of AIPs exceeded the limit-values for ground-water. These findings demonstrated that a suitable CPB mixture design to control the release of all HMs in CPB is of practical importance for ground-water quality.

摘要

这项研究阐明了富含硫化物的尾矿（S-rT）的胶浆回填（CPB）的地球化学行为。在CPB上进行动态储罐浸出测试长达360天。与碱性工业副产品（AIP）相比，CPB产生的酸度，Ec和SO ₄ ^2-相对较低。替代AIPs似乎可以大大减轻包括As在内的重金属（HMs）的释放。AIP的CPB中只有Mo和As超过了地下水的限值。这些发现表明，控制CPB中所有HM的释放的合适CPB混合物设计对地下水质量具有实际意义。