Leaching of potential hazardous elements of coal cleaning rejects

被引：0
作者：
Luis F. O. Silva
Maria Izquierdo
Xavier Querol
Robert B. Finkelman
Marcos L. S. Oliveira
Marcus Wollenschlager
Mark Towler
Rafael Pérez-López
Felipe Macias
机构：
[1] Catarinense Institut of Environmental Research and Human Development—IPADHC,Department of Geosciences
[2] Institute of Environmental Assessment and Water Research (IDÆA-CSIC),Inamori School of Engineering
[3] University of Texas at Dallas,Department of Geology
[4] Alfred University,Department of Soil Science
[5] University of Huelva,undefined
[6] University of Santiago de Compostela,undefined
来源：
Environmental Monitoring and Assessment | 2011年 / 175卷
关键词：
Brazilian coal mining; Coal beneficiation; Leaching; Trace pollutants;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The geochemical characteristics of coal cleaning rejects (CCR) in Santa Catarina State, Brazil, were investigated. Around 3.5 million ton/ year of coal waste are dumped in Santa Catarina State. Coal beneficiation by froth flotation results in large amounts of CCR composed of coaly and mineral matter, the latter characterised by the occurrence of sulphide minerals and a broad array of leachable elements. The total and leachable contents of more than 60 elements were analysed. Atmospheric exposure promotes sulphide oxidation that releases substantial sulphate loads as well as Ca2 + , K + , Mg2 + , Cl −  and Al3 + . The metals with the most severe discharges were Zn, Cu, Mn, Co, Ni and Cd. Most trace pollutants in the CCR displayed a marked pH-dependent solubility, being immobile in near-neutral samples. The results highlight the complex interactions among mineral matter solubility, pH and the leaching of potentially hazardous elements.
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页码：109 / 126
页数：17
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