Neutralisation of acid mine drainage with alkaline industrial residues: laboratory investigation using batch-leaching tests
Neutralisation of acid mine drainage with alkaline industrial residues: laboratory investigation using batch-leaching tests
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DOI：
10.1016/s0883-2927(02)00246-9
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发表时间：
2003-08-01
影响因子：
3.4
通讯作者：
Duchesne, J
中科院分区：
文献类型：
--
作者：
Doye, I;Duchesne, J
本研究是建立活性尾矿和碱性工业废物组成的毛细管屏障概念的第一步。该屏障的目的是(1)通过中和硫化铁产生的酸来短期缓解，(2)通过稳定二次产物来长期缓解。利用碱性工业废渣水泥窑灰（CKD）和赤泥铝土矿（RMB）生产中性条件。进行了一系列时控静态浸出试验。分别制备了碱度为0、2、5、10%的活性尾矿样品。水固比也发生了变化（3:1、6:1和20:1），以表征液态和固相之间的地球化学平衡。这些数据用于辨别是否存在特定离子的矿物溶解度控制。pH结果表明，使用5% CKD、10% CKD和10% （CKD + RMB）可使反应层保持中性pH条件。在此百分比下，溶液中Al、Fe、Cu、Zn和SO4的浓度与仅使用活性尾矿时相比显著降低。铝的浓度主要受二次相如薄水铝石和三水铝石的控制；铁，由针铁矿和水合铁组成；铜和锌，通过氢氧化物。钙和SO4的浓度由石膏的沉淀控制。发现Na和K的浓度不受矿物溶解度的控制。2003爱思唯尔科学有限公司版权所有。
This study constitutes a first stage of the elaboration of a concept for setting up capillary barriers composed of reactive tailings and alkaline industrial wastes. The aim of this barrier is (1) short-term mitigation by neutralising acid produced by Fe sulfides and (2) long-term mitigation by stabilisation of secondary products. The alkaline industrial wastes, cement kiln dust (CKD) and red mud bauxite (RMB), are used to produce neutral conditions. A series of time-controlled static leaching experiments were performed. Samples of reactive tailings were prepared containing 0, 2, 5, and 10% alkaline material. The water:solid ratios were also varied (3:1, 6:1, and 20:1) in order to characterise the geochemical balance between liquid and solid phases. The data are used to discern whether mineral solubility controls exist for particular ions. The pH results show that the use of 5% CKD, 10% CKD and 10% (CKD + RMB) allows neutral pH conditions to be maintained in the reactive layer. At these percentages, the concentrations of Al, Fe, Cu, Zn and SO4 in solution are significantly reduced compared with those obtained with the reactive tailings only. Aluminum concentrations are principally controlled by secondary phases like boehmite and gibbsite; Fe, by goethite and ferrihydrite; Cu and Zn, by hydroxides. Calcium and SO4 concentrations are controlled by precipitation of gypsum. The concentrations of Na and K are found not to be controlled by mineral solubility. (C) 2003 Elsevier Science Ltd. All rights reserved.