Mode of occurrrence of As and Pb in Huadian oil shale
GAO Yan
BAI Xiang-fei
Abstract：Taking the oil shale sample from Huadian Chengda mine, using two methods-centrifugal sedimentation and sequential chemical extraction, the modes of occurrence of As and Pb were researched.Ten density classes were set from 1.6 kg/L to 2.4 kg/L in centrifugal sedimentation method.Five-step sequential extraction method was chosen, the contents of As and Pb in every sequential chemical extraction state were determined by inductively coupled plasma mass spectrometry (ICP-MS).The results shows that: after centrifugation, As and Pb perform beneficiation in high density grade, they both have affinities, they coexist with pyrite, some of the Pb exist in clay minerals; elements of As and Pb of Huadian oil shale mainly exist as residue state, As which exists as residue state accounts for 73.39% and Pb which exists as residue state accounts for 5 1.38%.Sulfide bound form is also an important mode of occurrence of Pb, meanwhile, there is small part of As element which exists as organic state and sulfide bound form.
Keywords：oil shalemode of occurrenceAsPbcentrifugal sedimentation experimentsequential chemical extractionresidue stateICP-MS
Publication Date：2016-01-01
Pages：6( 1-5,28 )