INFLUENCE OF THERMAL TREATMENT CONDITIONS ON TRANSFORMATION OF TRACE ELEMENTS IN DATONG COAL
Transformation of As, Pb, Cr, Cd and Mn in Datong coal during pyrolysis was studied The pyrolysis experiment was carried out in a closed stainless steel reactor The effects of temperature(300-700℃ ),pressure(0 1-4MPa),and residence time under nitrogen atmosphere on the release of the trace elements were investigated The influence of reaction atmosphere (N 2 or H 2) on the emission of the trace elements was also investigated Results showed that the release of As, Pb, Cr, Cd and Mn increased with increasing pyrolysis temperature and residence time Higher pressure inhibited the release of the trace elements H 2 environment resulted in a higher release of the trace elements In the temperature range studied, As and Cd showed higher volatility than the other three elements during pyrolysis