Abstract:Based on principles of mass conservation, chemical equilibrium, element allocation constraints, heat conservation and index constraints, a multi-constraint control model of material balance and thermal balance for process of caustic soda oxidation roasting, sulfuric acid leaching, and cyanidation to treat complex gold mineral was constructed. Whole process simulation system was exploited for complex gold mineral roasting-acid leaching-cyanidation process. Material distribution and energy conservation in typical working conditions of the whole process was calculated and validated with production data. The results show that relative errors of Cu, S, Fe, and SiO2 contents compared with real values are -14.95%, -0.37%, 1.77% and -6.54%, respectively, and relative errors of Pb, Zn, and As contents are 6.15%, 4.94%, and 4.84%, respectively. Relative errors of Cu, S, Fe and SiO2 contents in acid leaching copper slag are -12.90%, 3.48%, 5.23% and 4.74%, respectively, and relative errors of Pb, Zn, and As contents are -10.75%, 0 and -1.27%, respectively. Relative errors of Cu, S, Zn, Fe, and As contents in cyanide slag are -3.57%, 3.48%, 5.88%, 3.71%, and -1.27% respectively.