Passive treatment of alkaline drainage from iron and titanium metallurgical slag

铁钛冶金渣碱性排液的被动处理

• 批准号: 577408-2022
• 负责人: Neculita, CarmenMihaelaCM
• 金额: $ 2.08万
• 依托单位: Université du Québec en Abitibi-Témiscamingue
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=757513
• 关键词: Passive; treatment; alkaline; drainage; iron

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.

采矿和冶金除其他废物外，还产生产生碱性排水（AlkD）的尾矿。AlkD的特征在于pH高于9，金属和硫酸盐的浓度可变。被动处理通常用于恢复产生矿井废水的矿区。然而，有一个关键的知识缺乏被动处理的AlkD。为期3年的应用研究项目的重点是被动抛光的铁和钛（Fe-Ti）渣尾矿产生的AlkD从一个积极的冶金网站蓄水。由于系统监测数据主要显示高pH值相关问题，以及其他污染物浓度超标的不一致性，该项目试图评估使用当地可用材料进行AlkD被动抛光的可行性，包括pH值降低和系统稳定性随时间推移的过程。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，用于准确描述Sorel-Tracy冶金厂的铁钛渣尾矿的环境特征，以及（ii）设计废物产生的AlkD的被动处理。具体目标是：SO 1）评估铁钛渣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设置测试结果预测排水水化学的演变; SO 3）评估影响因素的影响，并提出使用现场或附近可用材料被动处理AlkD的设计标准。所选材料的效率和相关成本的结果将有利于面临类似污染问题的加拿大矿业公司和政府改进最合适材料的选择。