• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Environmental geochemistry of the San Antonio-El Triunfo mining area, southernmost Baja California Peninsula, Mexico.
【24h】

Environmental geochemistry of the San Antonio-El Triunfo mining area, southernmost Baja California Peninsula, Mexico.

机译：墨西哥下加利福尼亚半岛最南端的San Antonio-El Triunfo矿区的环境地球化学。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The San Antonio-El Triunfo (SA-ET) area has been exploited for gold, silver and lead for about 200 years. Approximately 800,000 tonnes of tailings are present in the area. The current research focuses on the evaluation of the tailings, their effect on groundwater, and adsorption of arsenic as natural control for groundwater pollution.;The tailings were classified as: oxidized tailings, low-grade ore, cyanide heap-leached material, and byproducts of processing plants. Tailings samples were tested in humidity cells to quantify acid-producing and acid-consuming processes, and the potential leaching of arsenic (As) and zinc (Zn). A rough, but conservative calculation indicates leaching of the tailings could contribute 0.4 mg/l As and 0.5 mg/l Zn to groundwater.;The SA-ET and La Paz-Los Planes areas were divided into eleven sub-areas based in the analysis of groundwater. The highest values of total dissolved solids (TDS) and arsenic are in the mining area (;Several experiments on total As (arsenate + arsenite) adsorption by aquifer material of the SA-ET area were conducted to test the feasibility of this material acting as a natural control for As concentrations in groundwater. The experimental % adsorbed vs. pH curves obtained matched the topology of total As adsorption onto iron oxihydroxide surfaces. The experimental adsorption isotherm at pH 7 indicates saturation of adsorbing sites at high solute concentrations. Surface titration of the aquifer material indicates a point of zero charge (PZC) for the adsorbent of about 8 to 8.5 (iron oxihydroxides = 7.9 to 8.2). Comparison between experimental and modeled results (MICROQL and MINTEQA2 codes) suggests As is being adsorbed mostly by oxihydroxide surfaces in the natural environment. A travel time of about 700 to 5,000 years was estimated for the arsenic plume from SA-ET to La Paz.
机译：San Antonio-El Triunfo（SA-ET）地区被开采金，银和铅已有200多年的历史了。该地区约有80万吨尾矿。目前的研究集中在尾矿的评估，其对地下水的影响以及砷的吸附作为对地下水污染的自然控制。尾矿的分类为：氧化尾矿，低品位矿石，氰化物堆浸物料和副产物。加工厂。尾矿样品在湿度传感器中进行了测试，以量化产酸和耗酸过程，以及砷（As）和锌（Zn）的潜在浸出。粗略但保守的计算表明，尾矿的浸出可能对地下水贡献0.4 mg / l的As和0.5 mg / l的锌。;根据分析，将SA-ET和La Paz-Los平面区域分为11个子区域地下水。总溶解固体（TDS）和砷的最高值在矿区（;对SA-ET区域含水层材料进行的总砷（砷+砷+砷）吸附的多次实验，验证了该材料作为矿物质的可行性地下水中As浓度的自然对照。实验得出的吸附％-pH曲线与总As吸附在羟基氧化铁表面上的拓扑结构相吻合。pH为7时的实验吸附等温线表明高溶质浓度下吸附位的饱和。含水层材料表明吸附剂的零电荷点（PZC）约为8至8.5（羟基氧化铁= 7.9至8.2）。实验结果与模型结果（MICROQL和MINTEQA2代码）的比较表明，As主要被羟基氧化物表面吸附据估计，从SA-ET到La Paz的砷羽的行进时间约为700至5,000年。

著录项

  • 作者

    Carrillo, Alejandro.;

  • 作者单位

    University of Wyoming.;

  • 授予单位 University of Wyoming.;
  • 学科 Geochemistry.;Hydrology.;Geology.;Environmental Sciences.
  • 学位 Ph.D.
  • 年度 1996
  • 页码 130 p.
  • 总页数 130
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号