Passive treatment of alkaline drainage from iron and titanium metallurgical slag

除其他废物外，采矿和冶金还会产生产生尾矿的碱性废水(ALKD)。碱性D的特征是pH值高于9，金属和硫酸盐的浓度不同。对产生矿场的矿井水进行修复时，通常采用被动处理。然而，对阿尔克汀病的被动治疗方面的知识严重缺乏。这项为期3年的应用研究项目的重点是被动抛光由主动冶金场地蓄水池中的铁钛(Fe-Ti)尾矿产生的碱D。由于系统监测数据显示主要是与高pH值有关的问题，以及其他污染物浓度不一致超标，该项目试图评估使用当地可获得的材料进行AlkD被动抛光的可行性，包括随着时间的推移导致pH下降和系统稳定性的负责过程。准确地说，该项目的长期总体目标是(I)产生新的知识和相关工具，以准确地描述Sorel-Tracy冶金厂的铁钛尾矿的环境特征，以及(Ii)设计从废物中产生的碱的被动处理。具体目标是：SO1)评估铁钛尾矿的污染物浸出潜力；SO2)根据历史现场监测数据和实验室环境测试结果预测排水化学的演变；SO3)评估影响因素的影响，并提出利用现场或附近现有材料被动处理碱的设计标准。关于所选材料的效率和相关成本的结果将有利于加拿大矿业公司和面临类似污染问题的政府改进最合适的材料的选择。

Mining and metallurgy generate, among other waste, alkaline drainage (AlkD) producing tailings. AlkD is characterized by a pH above 9 and variable concentrations of metals and sulfate. Passive treatment is often used for the rehabilitation of mine drainage generating mine sites. However, there is a critical lack of knowledge on passive treatment of AlkD. The 3-year applied research project focuses on the passive polishing of an AlkD generated by iron and titanium (Fe-Ti) slag tailings from an active metallurgical site impoundment. As systematic monitoring data shows mostly a high pH-related issue, with inconsistent exceeding concentrations of other contaminants, the project attempts to evaluate the feasibility of AlkD passive polishing using locally available materials, including the responsible processes for pH decrease and system stability over time. Precisely, the long-term general objectives of this project are to (i) generate novel knowledge and relevant tools for accurate environmental characterization of Fe-Ti slag tailings from the Sorel-Tracy metallurgical plant, and (ii) design passive treatment for AlkD generated from the waste. The specific objectives are to: SO1) Evaluate the contaminant leaching potential of Fe-Ti slag tailings; SO2) Predict the evolution of drainage water chemistry, based on historical field monitoring data and laboratory setting test results; SO3) Evaluate the impact of influence factors and propose design criteria for passive treatment of AlkD using materials available on or near the site. Results on the efficiency of selected materials and the associated costs will benefit the Canadian mining companies and governments facing similar contamination issues to improve the selection of the most appropriate materials.