Material Science and Nanotechnology Eng. Dept., Abdullah Gül University, Kayseri, Turkey.
Mining Eng. Dept., Karadeniz Technical University, Trabzon, Turkey.
J Environ Manage. 2020 Mar 15;258:110037. doi: 10.1016/j.jenvman.2019.110037. Epub 2020 Jan 7.
The purpose of this research is to examine the neutralization performances of CaO-rich industrial waste products (IWPs) in the sulphide-rich environment of cemented paste backfill (CPB). A total of 205 CPB samples were prepared by using four different IWPs (type-C fly ash (C-FA), blast furnace slag (BFS), calcitic limestone (CL) and dolomitic limestone (DL)) as 5, 10 and 15 wt% substitute for sulphide-rich tailings. These CPB samples were cured and subjected to the acid (pH) and sulphate (SO) tests during 7-360 days of curing periods. MIP and XRD tests were also carried out to understand the generation of acid and sulphate and their effect on CPB stability at 28 and 180 days. The findings indicated that the utilisation of IWPs in CPB mixtures mitigated the acid (up to 58.9% higher pH values) and sulphate (up to 72.1% lower SO ion release) production, and enhanced the microstructure (12.43% lower total porosity) of CPBs owing to the neutralization potential, pore-filling effect, pozzolanic and partially binding characteristics of IWPs. It can be inferred from these findings that the IWPs can be suitably utilised as neutralization materials in CPB of sulphide-rich tailings. This in turn allows the mitigation of potential disposal/pollution problems associated with these IWPs.
本研究旨在考察富钙工业废料（IWPs）在胶结充填料（CPB）富硫环境中的中和性能。共制备了 205 个 CPB 样品，使用四种不同的 IWPs（C 型粉煤灰（C-FA）、高炉渣（BFS）、方解石石灰石（CL）和白云石石灰石（DL））作为 5%、10%和 15%的硫化物富尾矿替代物。这些 CPB 样品在固化期间进行了酸（pH）和硫酸盐（SO）测试，固化时间为 7-360 天。还进行了 MIP 和 XRD 测试，以了解酸和硫酸盐的生成及其对 CPB 稳定性的影响，测试时间为 28 天和 180 天。研究结果表明，IWPs 在 CPB 混合物中的利用减轻了酸（pH 值最高可提高 58.9%）和硫酸盐（SO 离子释放量最高可降低 72.1%）的产生，并增强了 CPB 的微观结构（总孔隙率降低 12.43%），这归因于 IWPs 的中和潜力、孔隙填充效应、火山灰和部分粘结特性。由此可以推断，IWPs 可以作为富硫尾矿 CPB 的中和材料得到适当利用，从而减轻与这些 IWPs 相关的潜在处置/污染问题。
