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Research on the novel technology of fluidized roasting reduction of low-grade  pyrolusite coupling with pretreatment of stone coal has been conducted.  According to the response surface design and the analysis of results,  orthogonal experiments have been conducted on the major factors and effects  of the factors on the manganese reduction efficiency have been studied. The  quadratic model between the manganese reduction efficiency and the factors  has been established. Meanwhile, the contour or 3D response surface of the  manganese reduction efficiency among various factors has been presented. The  maximum manganese reduction efficiency could be optimized to nearly 100%,  when the mass ratio of stone coal to pyrolusite was 2.5:1, the roasting  temperature of stone coal was 1080ºC, the roasting temperature of pyrolusite  was 775ºC, and the roasting time was 2h. The results of the manganese  reduction efficiency of the actual experiments were close to those of the  fitting model by the verification experiments, indicating that the optimum  solution has a relatively high reliability. Other low-grade pyrolusite such  as Guangxi pyrolusite (China), Hunan pyrolusite (China), and Guizhou  pyrolusite (China) were tested and all these materials responded well giving  nearly 100% manganese reduction efficiency

Response surface optimization of fluidized roasting reduction of low-grade pyrolusite coupling with pretreatment of stone coal