Use of steel slag to neutralize acid mine drainage (AMD) in sulfidic material from a uranium mine
Use of steel slag to neutralize acid mine drainage (AMD) in sulfidic material from a uranium mine
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DOI：
10.1590/s0100-06832013000300027
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发表时间：
2013-03
影响因子：
1.7
通讯作者：
Camila M. C. Leite;L. P. Cardoso;J. Mello
中科院分区：
文献类型：
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作者：
Camila M. C. Leite;L. P. Cardoso;J. Mello
酸性矿山水是矿山开采造成的主要环境影响之一。因此，应该采用创新的缓解策略，以中和酸性并防止AMD中微量元素的动员。利用工业副产品已被认为是一种经济和环境上有效的补救酸性矿井排水的替代办法。因此，本研究的目的是评估使用钢渣来缓解铀矿硫化物材料中的酸性矿山排水，作为使用石灰石的替代方案。因此，对来自米纳斯吉拉斯州卡尔达斯的Osamu Utsumi铀矿的硫化物材料施用了两种增加剂量的中和剂。使用了ArcelorMittal Tubarao公司的钢渣和一种商用石灰石作为中和剂。试验采用浸出柱，采用完全随机、[(2 × 3) + 1]因子设计，包括2种中和剂、3种剂量和1种对照，3个重复，共21个试验单元。评估了浸出溶液中的电导率（EC）、pH和Al、As、Ca、Cd、Cu、Fe、Mn、Ni、S、Se和Zn浓度。用ICP-OES测定微量元素浓度。此外，通过在NaOH溶液中捕获和在BaCl2存在下用HCl滴定，在浸出柱顶部测量CO2排放量。两种中和剂均使渗滤液的pH值升高，钢渣的pH值略高。试验初期石灰用量越高，EC越低，而使用石灰石的CO2排放量高于钢渣。在两种中和剂的存在下，还观察到微量元素动员的减少。因此，研究结果表明，与石灰石相比，使用钢渣是缓解AMD的合适替代品，具有减少二氧化碳排放到大气中的优势。
Acid Mine Drainage (AMD) is one of the main environmental impacts caused by mining. Thus, innovative mitigation strategies should be exploited, to neutralize acidity and prevent mobilization of trace elements in AMD. The use of industrial byproducts has been considered an economically and environmentally effective alternative to remediate acid mine drainage. Therefore, the objective of this study was to evaluate the use of steel slag to mitigate acid mine drainage in a sulfidic material from a uranium mine, as an alternative to the use of limestone. Thus, increasing doses of two neutralizing agents were applied to a sulfidic material from the uranium mine Osamu Utsumi in Caldas, Minas Gerais State. A steel slag from the company ArcelorMittal Tubarao and a commercial limestone were used as neutralizing agents. The experiment was conducted in leaching columns, arranged in a completely randomized, [(2 x 3) + 1] factorial design, consisting of two neutralizing agents, three doses and one control, in three replications, totaling 21 experimental units. Electrical conductivity (EC), pH and the concentrations of Al, As, Ca, Cd, Cu, Fe, Mn, Ni, S, Se, and Zn were evaluated in the leached solutions. The trace element concentration was evaluated by ICP-OES. Furthermore, the CO2 emission was measured at the top of the leaching columns by capturing in NaOH solution and titration with HCl, in the presence of BaCl2. An increase in the pH of the leachate was observed for both neutralizing agents, with slightly higher values for steel slag. The EC was lower at the higher lime dose at an early stage of the experiment, and CO2 emission was greater with the use of limestone compared to steel slag. A decrease in trace element mobilization in the presence of both neutralizing agents was also observed. Therefore, the results showed that the use of steel slag is a suitable alternative to mitigate AMD, with the advantage of reducing CO2 emissions to the atmosphere compared to limestone.