Thermal decomposition of pyrite in he nitrogen atmosphere

摘要

The effects of gas flow rate,reaction temperture,particle size,and time on thermal decompositon of pyrite have been ivnestigated between 673 and 1073 K ina nitrogen gas environment in which the gas-solid contact is effective.The decomposition reaction is well represented by the "shrinking core"model and can be divided into two regions with different rate controlling step.The rate-controlling step was found to be the heat transfer through the gas film for low conversion,but the mass transfer through product ash layer for high conversion the gas film for low conversion,but the mass transfer through product ash layer for high conversion.The activation energies for the heat transfer through the gas film and mass transfer through product ash layer-controlled cases were calculated as 113 and 96 kJ mol~-1,respectively.