The temperature gradient in pellets bed caused by heat transfer is a key factor which limits the reduction reaction in the Pidgeon process.In this paper,the effects of some factors,such as pellet size,charging pattern,temperature of the outer wall of the retort on the temperature distribution and reduction ratio distribution in the bed are studied with numerical method.The results show that the maximum reduction rate can be obtained when the pellet diameter is 22.3 mm and the reduction time is the same.The temperature of the outer wall of the retort should be increased as much as possible in the production process.The closer to the central area of the bed,the lower is the temperature,and the lower is the reduction ratio,and reduction reaction lage.The method by making an empty central region can effectively shorten the reduction cycle and improve the utilization ratio of raw materials.The optimal size of the empty central region is less than 27 mm diameter based on Mg yield per unit volume and unit time by taking operation time and reduction time into consideration for the retort with inner diameter 270 mm.
MgPidgeon processvacuum silicothermic reductionnumerical simulationheat transfer
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