In this paper, the technology that acid leaching slag was dried by microwave heating was studied. The influence of microwave power, microwave drying time, material mass and their interaction on the relative dehydration rate of acid leaching slag were investigated using response surface methodology (RSM). Based on the central composite design (CCD), a quadratic model was developed to correlate the preparation variables to the dehydration rate. The optimum conditions for drying acid leaching slag has been identified to be a drying temperature of 100 °C, drying duration of 12 min, microwave power of 750 W and material mass of 50 g. The relative dehydration rate of microwave drying acid leaching slag could reach 97.87% which is very close to the predicted dehydration rate of 98.81%, indicating that the response surface methodology optimization of process parameters for dehydration rate of acid leaching slag by microwave roasting are reliable.
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The authors are grateful for the financial support from the key cultivation disciplines of Liupanshui Normal University (LPSSYZDPYXK201708), high-level talent research start-up fund of Liupanshui Normal University (LPSSYKYJJ201707).
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