Abstract This paper presents column studies conducted to evaluate and assess the potential use of Fly Ash (FA). Basic Oxygen Furnace Slag (BOFS) based geopolymers to remove metals, sulphates and acidity from Acid Mine Drainage (AMD). Geopolymers were prepared using NaOH, Fly ash (FA) was used as source of silica additive to supplement BOFS. The blending ratio was fixed to 10% FA and the S/L ratio was kept 20%. The H2O2 was used as a blowing agent to increase the porosity of the FA/BOFS based geopolymer at four different percentages (1.5%, 1%, 0.5% and 0%). The four different geopolymers with distinct porosities were employed in different columns respectively. It was found that over 99% removal efficiency of metals and sulphates was achieved in the first 60 days of column studies. The dissolution of Ca(OH)2 was the main constituent responsible for the removal of acidity in AMD. Characterization revealed that precipitation was the main mechanism for removal of metals. Gypsum was the main byproduct formed with precipitated metals presented by goethite, spertite and manganite.

中文翻译：

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使用多孔粉煤灰-碱性氧气炉渣基地质聚合物净化酸性矿物废水的固定床柱研究

摘要 本文介绍了为评估和评估粉煤灰 (FA) 的潜在用途而进行的色谱柱研究。基于碱性氧炉渣 (BOFS) 的地质聚合物，用于去除酸性矿山排水 (AMD) 中的金属、硫酸盐和酸度。使用 NaOH 制备地质聚合物，粉煤灰 (FA) 用作二氧化硅添加剂的来源以补充 BOFS。混合比固定为 10% FA，S/L 比保持为 20%。H2O2 用作发泡剂以增加四种不同百分比（1.5%、1%、0.5% 和 0%）的 FA/BOFS 地质聚合物的孔隙率。具有不同孔隙率的四种不同地质聚合物分别用于不同的塔中。发现在色谱柱研究的前 60 天中实现了超过 99% 的金属和硫酸盐去除效率。Ca(OH)2 的溶解是负责去除 AMD 酸性的主要成分。表征表明，沉淀是去除金属的主要机制。石膏是主要的副产品，由针铁矿、闪锌矿和锰矿中的沉淀金属形成。