Adding steel slag to the acidic contaminated mine soil can immobilize heavy metal ions, but immobilization persistence of the metal ions needs to be determined. In this study, dynamic column simulation experiments were set up to compare the immobilization persistence of Cu, Cr, Pb and Zn ions in original soil and with the addition of slag, lime or fly ash to the soil during a simulated 36-month of acid rain leaching. After adding slag and lime, the pH, organic matter content and cation exchange capacity of soil were significantly increased. Compared with the original soil, additions of slag and lime to the soil were able to persistently immobilize the metal ions, whereas fly ash additions had little effect. During simulation, the metal ion concentrations in the slag group leaching solution were essentially consistent with Standard IV for groundwater. The metal ions were immobilized to form instable hydroxides and stable fractions following adding slag to soil. The hydroxide could rerelease metal ions by acid rain leaching, part of which were re-immobilized into stable fractions by entering slag lattice and complexing with soil organic matter. Therefore, adding slag to soil can persistently immobilize metal ions for heavy metal-contaminated acidic mine soil.

在酸性污染的矿井土壤中添加钢渣可以固定重金属离子，但需要确定金属离子的固定持久性。在这项研究中，建立了动态​​柱模拟实验，以比较在模拟的36个月酸中土壤中Cu，Cr，Pb和Zn离子固定化的持久性以及向土壤中添加矿渣，石灰或粉煤灰的持久性。雨淋。加入矿渣和石灰后，土壤的pH值，有机质含量和阳离子交换能力显着提高。与原始土壤相比，向土壤中添加矿渣和石灰能够持久地固定金属离子，而添加粉煤灰的影响很小。在模拟过程中，矿渣组浸出液中的金属离子浓度基本与地下水标准IV一致。在向土壤中添加矿渣后，将金属离子固定化以形成不稳定的氢氧化物和稳定的馏分。氢氧化物可以通过酸雨淋洗释放金属离子，通过进入矿渣晶格并与土壤有机质络合，将其中的一部分重新固定为稳定的馏分。因此，向土壤中添加矿渣可以持久地固定重金属污染的酸性矿山土壤中的金属离子。