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Column leaching test to study effect of cover of fly ash for preventing acid mine drainage from coal waste

机译：柱浸试验研究粉煤灰覆盖物对防止酸性废物从煤waste石中排出的作用

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摘要

Coal waste that releases highly acidic; sulfate and metals rich drainage is a serious environmental problem which causes the contamination of surface and ground water as well as soils in coal mining areas in China In order to study the effect of using fly ash for preventing acid-mine drainage and controlling heavy metals contamination from coal waste; two column leaching tests were conducted to determine if a cover of fly ash could be used for the control of acid-mine drainage from coal waste. We investigated the effect of the cover of fly ash on controlling acid; sulfate and heavy metals contamination from coal waste. The results from the experimental data analyses show that the cover of fly ash can effectively immobilize cadmium; copper; iron; lead and zinc in acid-mine drainage from coal waste; increase the Ph value from 2.0 to 7.5 and decrease Eh from 249 Mv to 148 Mv; EC from 5.22 Ms/cm to 1.05 Ms/cm and SO_4~(2-) concentrations from 12911.7 mg/L to 881.4 mg/L of acid-mine drainage from coal waste. The immobilization rate of heavy metals reached 99%. The oxidation of sulfide minerals in coal waste was prevented by the cover of fly ash; which favors the generation of alkalinity; the decrease of the population of Thiobacillus ferrooxidans; the heavy metals immobilization by precipitation inside the column; and the halt of the oxidation process of sulfide through iron coating on the surface of sulfide minerals in coal waste. The cover of fly ash can effectively control acid-mine drainage and heavy metals contamination from coal waste in situ treatment systems.
机译：释放高酸性的煤渣；富含硫酸盐和金属的排水是一个严重的环境问题，在中国的煤矿区造成地表水，地下水和土壤的污染。为了研究粉煤灰对防止酸碱矿排水和控制重金属污染的作用煤炭浪费；进行了两次柱浸试验，以确定是否可以使用粉煤灰覆盖物来控制煤渣中的酸性矿物质排放。我们研究了粉煤灰覆盖物对控制酸的影响。煤渣中的硫酸盐和重金属污染。实验数据分析结果表明，粉煤灰覆盖层可以有效地固定镉。铜;铁;煤炭废渣中的酸性矿山中的铅和锌排放；将Ph值从2.0增加到7.5，并将Eh从249 Mv降低到148 Mv； EC从5.22 Ms / cm到1.05 Ms / cm，SO_4〜（2-）的浓度从12911.7 mg / L到881.4 mg / L。重金属的固定化率达到99％。粉煤灰的覆盖防止了煤渣中硫化物矿物的氧化。有利于碱度的产生；铁氧化硫杆菌的数量减少；重金属通过柱内沉淀而固定化；并通过在煤渣中硫化物矿物表面上的铁涂层停止硫化物的氧化过程。粉煤灰的覆盖层可以有效地控制原矿处理系统中的酸矿排放和煤渣中的重金属污染。

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  • 来源
    《Military operations research》 |2012年第4期|p.331-337|共7页
  • 作者

    Ma Baoguo; Zhang Mingliang; Hu Zhenqi;

  • 作者单位

    College of water resource and hydroelectricity, Hebei University of Engineering,Handan 056021, Hebei, China,Institute of Land Reclamation and Ecological Restoration, China University of Mining and Technology, Beijing 100083,China;

    inan University, Jinan 250022, Shandong, China;

    Institute of Land Reclamation and Ecological Restoration, China University of Mining and Technology, Beijing 100083,China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    coal waste; acid-mine drainage; fly ash; leaching; prevention;

    机译：煤渣酸矿排水粉煤灰浸出预防;

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