Abstract:Arsenic-alkali residue was used as alkali source and co-sintered with As-Sb bearing dust. Contents and phase changes of As and Sb in volatile atmosphere, dust and roasting slag under different roasting atmosphere and temperature were studied, effects of roasting atmosphere and temperature on migration and transformation of As and Sb were analyzed. The results show that volatilization of arsenic and antimony rises with increase of roasting temperature in air atmosphere, and As and Sb in residue is finally converted into Na3AsO4 and NaSbO3 respectively. Volatilization of arsenic drops gradually and volatilization of antimony rises gradually with increase of roasting temperature in nitrogen atmosphere, and both As and Sb are finally fixed in residue and convert into sodium arsenite and sodium antimonite respectively. Dust with 90.77% Sb content and 95.95% arsenic curing rate can be obtained by roasting in nitrogen atmosphere at 900 ℃.