Brazilian coal mining residues and sulphide oxidation by Fenton's reaction: an accelerated weathering procedure to evaluate possible environmental impact.
Brazilian coal mining residues and sulphide oxidation by Fenton's reaction: an accelerated weathering procedure to evaluate possible environmental impact.
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DOI：
10.1016/j.jhazmat.2010.11.032
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发表时间：
2011-02
影响因子：
13.6
通讯作者：
L. O. Silva;X. Querol;K. da Boit;S. Fdez‐Ortiz de Vallejuelo;J. Madariaga
中科院分区：
文献类型：
--
作者：
L. O. Silva;X. Querol;K. da Boit;S. Fdez‐Ortiz de Vallejuelo;J. Madariaga
建议采用芬顿反应作为与巴西采煤残留物（CMR）相关的硫化物的加速风化试验，这些残留物在煤炭开采过程中暴露于氧气和水。利用透射电镜和扫描电镜/能谱仪对试验前后剩余煤及其它岩性单元中矿物的性质、产状和分布进行了评价。通过ICP-MS或ICP OES分析可溶性硫（硫酸盐）和溶解金属，检查CMR的氧化。随着溶解硫酸盐的增加，溶解的Zn，Cd，Cu和Co的浓度增加，导致在剩余的固相中检测不到的量;溶解的Ni和Mn也增加与动员硫，但在固体中的剩余部分是最重要的部分; Fe和Pb不动员由于沉淀黄钾铁矾或赤铁矿的情况下，Fe或硫酸盐的情况下，铅。观测结果和地球化学模拟的预测之间的协议进行了讨论。
Fenton's reaction is proposed as an accelerated weathering test for sulphides associated with Brazilian Coal Mining Residues (CMR), that are exposed to oxygen and water during the mining of coal. TEM and SEM/EDX were used to evaluate the nature, occurrence and distribution of minerals in remaining coals and other lithological units, before and after applying the test. Oxidation of CMRs was examined by analyzing soluble sulphur (sulphate) and dissolved metals by ICP-MS or ICP OES. As dissolved sulphate increases, dissolved Zn, Cd, Cu and Co concentrations increase, leading to undetectable amounts in the remaining solid phases; dissolved Ni and Mn also increase with the mobilized sulphur, but the remainder in the solids is the most important fraction; Fe and Pb are not mobilized due to precipitation as jarosite or hematite in the case of Fe or as sulphate in the case of Pb. Agreement between the observed results and the predictions by geochemical modelling is discussed.