Study On The Occurrence Form Of Trace Elements In High Sulfur Coal

As an important coal resource in China,high sulfur coal has extremely high research value.The high content of sulfur and harmful trace elements in high sulfur coal itself will migrate to the soil,water environment and atmosphere during coal mining,washing,and combustion.Based on different sulfur content of A,B,C three kinds of coal as the research object,using proximate and ultimate analysis,XRD,SEM-EDX and ICP-MS to study the content of some harmful trace elements,combined with SPSS software to explore the correlation between different trace elements and ash,sulfur content,and got the main carrier of some elements.Then,the A coal with the highest sulfur content was characterized by 13C NMR,FT-IR and XPS.The occurrence patterns of some harmful trace elements in coal A were studied by step by step chemical extraction experiments.The main conclusions are as follows:The sulfur content of coal A is 4.98%,and the content of Fe2O3 in ash is 23.83%.The characterization of ash samples by XRD and EDX proves that coal A contains iron sulfide minerals.The main form of carbon in coal A is aromatic carbon.Nuclear magnetic resonance carbon spectroscopy,XPS C(1s)and Fourier infrared spectroscopy analysis show that coal A has a high degree of aromatization.The sulfur in coal A exists in the form of organic sulfur such as mercaptans,thioethers,polycyclic benzene sulfides,and inorganic sulfur such as iron sulfide and ferric sulfate.The inorganic sulfur component accounts for 89%,indicating that the main sulfur in coal A It exists in inorganic form.Using |R|>0.95 as the basis for distinguishing significant correlation,it can be concluded that there is a significant correlation between Cu,Sr,Zn,Sc and V.There is a significant correlation between Ba,Mo,Mg,Ni and Co.Significant correlation between K,Cr,Ti and Fe.According to the cluster analysis pedigree,the above elements can be divided into 7 groups:1)Ba,Mo,Mg,Ni,Co;2)Cu,Sr,Zn,Sc,V;3)K,Cr,Ti,Fe;4)S,ASH,Mn;5)Pb,Ga;6)Ca,Li;7)Zr,Hf,A1,Nb;Correlation analysis results show that Ga is stored in bauxite minerals;Nb and Hf are stored in zircon in the form of isomorphous substitution;Pb,Ni and Cr elements are stored in clay minerals,such as hematite and rutile;Mn element mainly exists in siderite minerals;Mo and V exist in clay minerals.The experimental results of grade A chemical extraction of coal A show that except T1,the remaining elements in the remaining element states have the most content,and the five elemental residue states of Li,Ti,V,Cr,and Ga account for more than 90%,and the remaining states The content of trace elements extracted is very small;Sr,Y,Sn,Ba,T1,Pb and other elements account for a relatively high content of extractable state;Mn,Co,Cu,Sb,T1 and other elements account for a relatively high content of organic state;iron-manganese oxidation The proportion of all trace elements in the substance-bound state and the carbonate-bound state is relatively low;elements such as Sr,Sn,Ba,and T1 account for a relatively high content in the exchangeable ion state.Figure[23]Table[24]Reference[83]...