Study On The Occurrence Of Trace Elements In Coal

In order to provide scientific basis for Chongqing Nantong coalfield coal resources exploitation and reasonable utilization,a total of 38 samples of coal and rock are collected from Donglin and Nantong Mine.The content characteristics of trace elements in coal and the occurrence state of the elements are studied.A total of 18 samples of coal and rock are collected from Donglin 4 mine(17 coal samples and 1 rock samples),11 samples collected from Donglin 6 mine(7 coal samples and 4 rock samples)and 9 samples collected from Nantong 5 mine(7 coal samples and 2 rock samples).The content characteristics,enrichment coefficient and their occurrence state of trace elements in three main coal seam coal are studied.The use of Nantong coalfield of three main mining the content of trace elements in coal seams in the test results,analysis of Li,Be,V,Cr,Co,Ni,Cu,Zn,As,Se,Sr,Mo,Cd,Sb,Tl,Pb and other elements in the general characteristics,level and degree of enrichment.The results show that Nantong coalfield three main coal seams in addition to Sr content is relatively high,the remaining elements less than 100 mg/kg,Cd,Sb and Tl are even less than 1 mg/kg,the content of each element in the roof and floor rock layer is obviously higher than that of other coal beds;The average content of most of the elements in three main coal seams is small,except for some elements such as Zn,Se,Sr,As and Mo.On the whole,the content of trace elements in Donglin 6 is lower than that of Donglin 4 coal and Nantong 5 coal;The contents of most elements are in the range of content China coal,in addition to Li,Zn,Se and Sr elements from Donglin 4 mine,Li,Cr,As and Se elements from Nantong 5 mine,Li and Be elements from Donglin 6 mine.The experimental analysis of the relative content in six different combination of state elements by sequential chemical extraction,combined with the content of trace elements and ash content,correlation analysis and cluster analysis between the total sulfur and sulfur and trace elements,chemical properties and the results of previous studies based on the trace elements of coal in Nantong,Li,Be Ni,As,elemental occurrence.The results show that Li elements are most likely to exist in clay minerals and organic matter;Be elements are most likely to exist in organic matter and carbonate minerals;Ni may exist in clay minerals and organic matter;As probably exists in pyrite.