Migration of Trace Elements in Fushun Oil Shale during Self-Combustion and its Environmental Significance
Self-combustion of oil shale has been occurring and widespread in a long term while oil shale was considerably piled in Fushun dumping sites. After collecting samples of high- and low-grade oil shale from Fushun West Open Mine, the self-combusted oil shale from Fushun West Dumping Site, and designing the indoor high-temperature incineration experiments to simulate the self- combustion process, we tested trace elements in them and their ashes of 700°C, 1000°C by means of ICP-MS. Based on the analysis and comparison of the test dada, we studied content characteristics and migration pattern of elements during self-combustion. The results showed that elements were distributed in the similar way in samples and contents of Zr, Sr, Cr, V, Zn, Ni, Rb and Li were very high. A large amounts of trace elements were found to enter the atmosphere through volatilization in the process of Self-combustion, especially those higher volatile elements, such as Sb, Zn, Pb, W, Sn, Ta and Cd, while a few elements preferred to concentrate in solid-phase ashes. Different distribution and migration capacities of elements might be the main reason for the higher concentration of some elements in self-combusted oil shale than their background values in Liaoning soil.
Hexing Li, Qunjie Xu and Daquan Zhang
L. P. Zhang et al., "Migration of Trace Elements in Fushun Oil Shale during Self-Combustion and its Environmental Significance", Advanced Materials Research, Vols. 356-360, pp. 933-938, 2012