Low-grade manganese ore reduction roasting system and method

The invention provides a low-grade manganese ore reduction roasting system and method. The roasting system comprises drying equipment, pulverizing equipment, a sectional type reduction furnace, a cyclone dust collector, a high-temperature dust remover, a high-temperature fan, an induced draft fan, a dust removal device and a desulfurization device. The reduction roasting method comprises the processes of drying, pulverizing, roasting, primary powder-gas separation, secondary powder-gas separation, high-temperature hot gas recycling, dust removal, desulfurization and the like. Large-scale reduction roasting of low-grade manganese ore can be achieved, coal gas is sprayed into the bottom of the sectional reduction furnace, the contact area is increased, the contact time is prolonged, and manganese ore powder is fully reduced. The roasting temperature in the sectional type reduction furnace is controlled according to the amount of bituminous coal and coal gas, the temperature is monitored in real time, it is ensu