Study on technology of reduction roasting in suspending of manganese oxide ore

Technology of reduction roasting in suspending of manganese oxide ore are studied in this paper. The roasting temperature was between 800~950℃ when it is roasted in accumulative formation, The transform rate of manganese dioxide transformed into manganese oxide is above 90%. Iron content of roasted product can be decreased 30% by low intense magnetic separation, while loss of Mn、 MnO content is less than 3%. When manganese minerals in from Guangxi Xin-manganese group Co.,Ltd. are roasted, Results of multi-grade suspending pilot test whose capacity is 500kg/h showed that: in the condition of the volume fraction of CO was 4.5％~7.5％, the reaction furnace temperature was 1050~950℃ and the solid-gas ratio was 0.5~0.8 kg/m³,By suspending flash reduction roasting, manganese dioxide reduction index is above 90%. Speculated by test data, The heat need to be supplemented is 1.432×10⁶ kJ/t when 1ton raw material is reduced, Converted into 48.94kg (coal equivalent)/t (ore). The suspending flash reduction roasting reaction process has a wide operating range for parameters such as temperature, atmosphere, solid-gas ratio and so on. The reduction roasting system can be controlled and be operated easily and stably, Reaction time is reduced to 5~60 seconds, Ferromanganese ratio of reduction product are highly improved by magnetic separating purification. New technology provide the technical foundation for taking full advantage of this manganese resources.