Abstract:The reaction behavior of components in PbSO4-ZnO-C system with Na2CO3 molten salt was investigated, and the reaction mechanism in process of sulfur fixation reduction lead smelting from PbSO4 was revealed. The results show that PbSO4 first reacts with Na2CO3 to produce PbO and Na2SO4, and then PbO and Na2SO4 are reduced to metal Pb and Na2S respectively in the temperature range of 873—1 123 K; Na2S reacts with ZnO to produce ZnS and Na2O, and Na2O reacts with CO2 to produce Na2CO3 when the reaction temperature is greater than 1 123 K. Na2CO3 not only acts as molten medium to improve heat transfer, mass transfer and momentum transfer effects, but also is one of main intermediate reactant in PbSO4-C-ZnO sulfur fixation reduction smelting system. ZnO is not only used as sulfur-fixing agent, but also a regenerant of Na2CO3 molten salt in the reaction process.