Using abundant and cheap steel slag for metals removal from water represents an opportunity to recover waste material from one industry as a resource for another. In this study, powdered steel slag which contains lime (CaO) leftover from the steelmaking process, was evaluated and benchmarked against the relatively expensive and energy-intensive chemical sodium hydroxide (NaOH) for the removal of cadmium (Cd), manganese (Mn), and zinc (Zn) from two different mine drainage waters. Unlike isotherm and kinetic studies that represent most previous work, this study evaluated metals removal under realistic simulated water treatment conditions (doses, mixing, contact times, etc.), bringing the material one-step closer to actual full-scale implementation. In the neutral pH water with lower metals concentrations, approximately four times more steel slag (400 mg/L) compared to NaOH (100 mg/L) was required to achieve >70% metals removal. In the acidic pH water with higher metals concentrations, steel slag was insufficient to raise the pH at reasonable doses (<1,000 mg/L) but was shown to reduce NaOH dosing requirements by 25% (600 to 450 mg/L) when used in combination with steel slag (600 mg/L). Like NaOH, steel slag addition facilitated metal precipitate formation but also provided relatively high specific surface area (7.6 m²/g) for metal adsorption, particularly for Mn, a promising finding for future work to evaluate sludge recycle. Water treated with steel slag was also found to be more amenable to 0.45 μm filtration than water treated with NaOH.

使用大量廉价的钢渣从水中去除金属代表了一个机会，可以从一个行业回收废料，作为另一个行业的资源。在这项研究中，对炼钢过程中残留的含有石灰（CaO）的粉状钢渣进行了评估，并以相对昂贵且耗能大的化学氢氧化钠（NaOH）为基准，以去除镉（Cd），锰（Mn） ，以及来自两种不同矿山排水的锌（Zn）。与代表大多数以前工作的等温线和动力学研究不同，本研究评估了在现实的模拟水处理条件（剂量，混合，接触时间等）下的金属去除，使材料更接近于实际的全面实施。在具有较低金属浓度的中性pH水中，要实现> 70％的金属去除率，钢渣（400 mg / L）大约是NaOH（100 mg / L）的四倍。在金属含量较高的酸性pH水中，钢渣不足以提高合理剂量（<1,000 mg / L）的pH，但已证明将其用于NaOH时可将NaOH剂量要求降低25％（600至450 mg / L）。与钢渣（600 mg / L）结合使用。像NaOH一样，钢渣的添加促进了金属沉淀的形成，但也提供了相对较高的比表面积（7.6 m 000 mg / L），但与钢渣（600 mg / L）结合使用时，可将NaOH剂量要求降低25％（600至450 mg / L）。像NaOH一样，钢渣的添加促进了金属沉淀的形成，但也提供了相对较高的比表面积（7.6 m 000 mg / L），但与钢渣（600 mg / L）结合使用时，可将NaOH剂量要求降低25％（600至450 mg / L）。像NaOH一样，钢渣的添加促进了金属沉淀的形成，但也提供了相对较高的比表面积（7.6 m² / g）用于金属吸附，特别是对于锰，这对于评估污泥再循环的未来工作是有希望的发现。还发现，用钢渣处理的水比用NaOH处理的水更易于过滤0.45μm。