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电石渣在治理废渣废水方面的应用 被引量:5
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作者 何斌林 《有色金属(选矿部分)》 CAS 北大核心 2001年第1期41-43,共3页
遂昌金矿使用电石渣取代原石灰中和酸性废水处理工艺 ,具有成本低、使用方便等特点 ,对产生酸性废水的含硫废石渣场采用电石渣覆盖治理 ,大大降低了酸性滤沥水的产量和杂质浓度。经综合治理后 ,外排废水合格率提高 ,生产成本大幅度下降 ... 遂昌金矿使用电石渣取代原石灰中和酸性废水处理工艺 ,具有成本低、使用方便等特点 ,对产生酸性废水的含硫废石渣场采用电石渣覆盖治理 ,大大降低了酸性滤沥水的产量和杂质浓度。经综合治理后 ,外排废水合格率提高 ,生产成本大幅度下降 ,环境效益、经济效益、社会效益都十分显著 ,具有良好的实际应用价值。 展开更多
关键词 电石渣 酸性废水 含硫废石渣场 滤沥水 处理成本
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Physico-chemical and elemental investigation of aqueous leaching of high sulfur coal and mine overburden from Ledo coalfield of Northeast India 被引量:5
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作者 Madhulika Dutta Puja Khare +2 位作者 Sanchita Chakravarty Durlov Saikia Binoy K. Saikia 《International Journal of Coal Science & Technology》 EI 2018年第3期265-281,共17页
Acid mine drainage (AMD) is one of the major problems in high sulfur coal mining areas generating acidic water. The acidic mine water generated contain hazardous elements in varying concentrations. The Northeastern ... Acid mine drainage (AMD) is one of the major problems in high sulfur coal mining areas generating acidic water. The acidic mine water generated contain hazardous elements in varying concentrations. The Northeastern Indian coalfield produces considerable amounts of AMD. The AMD and metal leaching from coal and mine over burden (OB) are the two important naturally occurring processes. In order to know the AMD potential, the aqueous leaching experiment of a few coal and OB samples from the Ledo colliery of the Northeastern coalfield, Mergherita (India), at different time periods (1, 3, 5, and 8 h) and at different temperatures (25, 45, 65, and 90℃) were performed in the laboratory. The physico- chemical analysis of the aqueous leachates shows the pH, electrical conductivity (EC), and total dissolved solid (TDS) in the range of 1.62-3.52, 106-2006 μs/cm, and 106-1003 ppm for the raw coal samples respectively. The OB samples produced pH, EC, and TDS in the range of 3.68-6.92, 48.6-480 μs/cm, and 69.5-240 ppm respectively. From the study, it was revealed that the concentrations of major (Si, A1, K, Na, Fe, Ca, Mg), minor (Mn) and trace/hazardous elements (As, Ba, Cd, Co, Cr, Cu, Hg, Ni, Pb, Se, Zn) considerably change with leaching time as well as with leaching temperature. Out of these elements As, Cd, Hg, Pb, Cr, and Se are of greater environmental importance. Alteration of the physico-chemical structure of the coal and OB samples resulting from leaching was also studied by field emission scanning electron microscope- energy-dispersive X-ray spectroscopy method. The release of the potentially hazardous elements from the raw coal and OB during leaching time periods to the leachates was detected by inductively coupled plasma-atomic emission spectroscopy and ion-chromatographic analyses. The major minerals found in coal and OB are quartz (SiO2), pyrite (FeS2), hematite, marcasite, and kaolinite. The association of different functional groups in minerals and their mode of association were studied by Fourier-transform infrared spectroscopy and X-ray diffraction analytical techniques. The present laboratory study will be useful in relating the characteristics of aqueous leaching from coal and mine OB with the natural weathering condition at the coal mine area. 展开更多
关键词 AMD High sulfur coal Coal mine overburden Aqueous leaching Elements in coal and OB Coal qualityassessment
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