Laboratory evaluation of the use of alkaline covers to prevent acid mine drainage
Laboratory evaluation of the use of alkaline covers to prevent acid mine drainage
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DOI：
10.1590/s0100-06832012000300010
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发表时间：
2012-06-01
期刊：
影响因子：
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通讯作者：
Lena, Jorge Carvalho de
中科院分区：
文献类型：
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作者：
Abreu, Adriana Trópia de;Faria, Efigênia Miranda de;Lena, Jorge Carvalho de
碱性井盖防治矿山酸性排水的实验室评价矿山酸性排水是一个世界性的环境问题。它是由含硫化物矿物的材料暴露在细菌介导的大气条件下的化学氧化过程引起的。在这些环境中产生的酸性水会影响水体的质量。预防和补救方法的应用，以遏制AMD。由于修复通常意味着非常高的成本，人们研究了干覆盖物作为预防的替代方法。本研究的目的是评价碱性覆盖层在浸出柱系统下控制铀(U)岩石开采废物产酸的有效性。为此，采用了含有赤泥、石灰石和石灰等中和剂的覆盖系统。从米纳斯吉拉斯州卡尔达斯的Osamu Utsumi矿山收集了废岩石和水的样本。对废石、石灰、石灰石和赤泥进行了化学和矿物学分析。采用C1（废石）、C2（废石+赤泥覆盖层）、C3（废石+石灰石覆盖层）、C4（废石+石灰覆盖层）、COB2（赤泥覆盖层）、co3（石灰石覆盖层）和COB4（石灰覆盖层）7个浸出柱进行动力学试验。对浸出样品进行100天的监测。结果表明，石灰和赤泥具有较大的中和潜力。然而，这些中和剂的缺点是将可溶性物质引入渗滤液中。因此，与碱性工业废物回收有关，所评估的参数表明，使用赤泥与处置废石的混合物作为限制AMD生成的可行替代方案。
LABORATORY EVALUATION OF THE USE OF ALKALINE COVERS TO PREVENT ACID MINE DRAINAGEAcid mine drainage (AMD) is a worldwide environmental problem. It is caused by the chemical oxidation process of materials containing sulfide minerals exposed to atmospheric conditions mediated by bacteria. Acidic waters generated in these environments can affect the quality of water bodies. Prevention and remediation methodologies are applied in order to contain AMD. As an alternative for prevention, dry covers have been studied, because remediation usually means very high costs. The objective of this study was to evaluate the effectiveness of alkaline covers to control acid generation from uranium (U) rock mining waste using leaching column systems. For this purpose, cover systems containing neutralizing agents such as red mud, limestone and lime were applied. Samples of waste rock and water were collected from the Osamu Utsumi mine, in Caldas, Minas Gerais. The waste rock, lime, limestone and red mud were subjected to chemical and mineralogical analyses. Seven leaching columns were installed for the kinetic tests: C1 (waste rock), C2 (waste rock + red mud cover), C3 (waste rock + limestone cover), C4 (waste rock + lime cover), COB2 (red mud cover), COB3 (limestone cover) and COB4 (lime cover). The leached samples were monitored for 100 days. The results showed that lime and red mud have a greater neutralizing potential. However, these neutralizing agents have the disadvantage of introducing soluble material into the leachate. Therefore, associated with alkaline industrial waste recycling, the parameters evaluated indicate the use of a mixture of red mud with disposal waste rock as a viable alternative to restrict AMD generation.