Industrial experiment study on preparation of battery grade manganese sulfate by combined desulfurization of pyrolusite and rhodochrosite

Combined flue gas desulfurization of pyrolusite and rhodochrosite and an industrial experiment study on the preparation of battery-grade manganese sulfate were performed in a thermal power plant in Guizhou. The results show that the high-efficiency desulfurization of SO₂ can be achieved by using the pyrolusite to redox desulfurization, adjusting the pH value of pulp by rhodochrosite, and the two-stage desulfurized, and the SO₂ absorption rate can reach over 99%. The process can not only realize comprehensive utilization of lean manganese ore resources but also make the wasted SO₂ flue gas into treasure. The manganese sulfate as a desulfurization product can meet the requirements of battery-grade manganese sulfate after deep purification. Industrial test further revises and standardizes the operation rules for this process, which provides a solid foundation for industrial design and production.