| Abstract: | this paper gives the definition of hazardous trace elements in coal, namely, the hazardous trace elements coal contain toxic cancer - inducing, corrosive, radioactive elements, of which concentrations are less than 1.0% . According to this definition, the hazardous trace elements in coal should refer to fluorine, chlorine, cadmium, mercury, chromium, lead, arsenic, beryllium, nickel, thorium, uranium, antimony, tellurium, germanium, tin, gallium, indium, polonium, which has not been found in coal (Finkelman, 1994), radium, strontium, barium, lithium, the number of which are 22.However, in view of environmental protection, current concern hazardous elements include As, Cr, Pb, Hg, Cd, Sb, Se, Mn, Ni, Cu,Zn, Cl, F, Mo, Co, Ba, V, Ag, Th, U, Be, B, Br, Li, Na, which amount to 25. Hence, taking into consideration of theoretical harm and current concern of environment , we should put emphasis on these elements: As, Cd, Pb, Hg, Cd, Se, Mn, Ni, Cu, Zn, Sb, Co, Mo,Tl,Be,F,Cl,V,Ba,Th,U,Ag,which amount to 22.At last,the authors also discussed the significance of study on hazardous elements in coal to environmental protection, also reviewed recent advance and problem of study on hazardous elements in coal. |
