Abstract: It is a kind of economic and environmental-friendly method that leaching manganese from a low-grade pyrolusite by cane molasses as reducing agent.But a certain amount of chloride ions is found in cane molasses，which will bring serious corrosion damage to the electrolytic anode plate in production practice.Chloride ions were removed from cane molasses and regenerating wastewater by sulfuric acid cooking method.The influences of reaction temperature，reaction time，and concentration of sulfuric acid were investigated.Results showed that using cane molasses treated under the conditions，i.e.mass fraction of H2SO4 was at 40%~45%，reaction time was 2 h，and reaction temperature was 80 ℃，to reduce the pyrolusite，the relative Mn leaching rate was 91.51%，meeting the requirements.

Key words: cane molasses, sulfuric acid, reduced pressure distillation