采矿活动破坏地下自然氧化平衡,增加金属硫化物如黄铁矿的氧化。该过程导致高酸性矿井排水(AMD)的形成,其中铁(Fe)和硫酸盐(SO42-)的浓度升高。然而,通用封堵和回填方法,在不考虑不同金属矿山的特定开采后氧化环境的情况下应用时,通常产生最小的结果。为弄清德兴市某金属矿开采后地下氧化还原环境的分布,中国,洪水和干旱时期的十五个水样,以及十五个钻孔样本,被收集用于水文地质和化学分析。第一次,该研究提出,氧化还原区可以通过对储水介质的垂直分析来识别和划定,矿物成分,和水化学特性。建立了水文地球化学原因模型,揭示AMD的形成主要发生在氧化区和过渡区。根据研究区的氧化还原带特征,在第1号型腔的氧化区和过渡区进行了实际的工程密封。23.因此,pH值从修复前的2.5增加到4.5,表明酸度降低。SO42-和Fe的浓度显著降低,从治疗前的1360.0mg/L和147.0mg/L降至治疗后的726.0mg/L和23.6mg/L;总下降分别为46.6%和84.0%,分别。Mn和Cu的浓度相似,分别下降10.7%和15.6%,分别。该研究为金属矿开采后氧化还原带的精细识别和分类提供了新的方法和有价值的参考。以及用于产生AMD的空洞的靶向堵塞和治疗。
Mining activities disrupt the natural oxidative balance underground, increasing the oxidation of metal sulfides like pyrite. This process leads to the formation of highly acidic mine drainage (AMD) with elevated concentrations of iron (Fe) and sulfate (SO42-). However, generic plugging and backfilling methods, when applied without considering the specific post-mining oxidative environments of different metal mines, often yields minimal results. To clarify the distribution of the underground redox environment after mining of a metal mine in Dexing,
China, fifteen water samples from flood and dry periods, as well as fifteen borehole samples, were collected for hydrogeological and chemical analysis. For the first time, the study proposed that the redox zone could be identified and delineated through vertical analysis of water storage media, mineral composition, and hydrochemical characteristics. A hydrogeochemical cause model was constructed, revealing that AMD formation primarily occurs in oxidative and transition zones. Based on the redox zone characteristics of the study area, actual engineering sealing was performed on the oxidation and transition zones of cavity No. 23. As a result, the pH increased from 2.5 before remediation to 4.5, indicating a reduction in acidity. The concentrations of SO42- and Fe significantly decreased, reducing from 1360.0 mg/L and 147.0 mg/L before treatment to 726.0 mg/L and 23.6 mg/L after treatment; the total decrease amounting to 46.6 % and 84.0 %, respectively. The concentrations of Mn and Cu similarly, decreased by 10.7 % and 15.6 %, respectively. This study provides a novel approach and valuable reference for the refined identification and classification of redox zones after metal mine exploitation, as well as for the targeted plugging and treatment of cavities that produce AMD.