Ceralink Inc. is applying Microwave Assist Technology? (MAT?) to the calcination of limestone to demonstrate the potential for significant energy reduction in the manufacturing of lime. MAT? is a method to simultaneously apply traditional radiant heat and microwave energy in the same kiln, leading to fast volumetric product heating. Microwave thermal activation targets and directly heats limestone, eliminating the reliance on thermal conduction as a means of energy transfer. In addition, less energy is wasted in heating non-product, such as the atmosphere and kiln lining. This paper includes studies of microwave materials interactions through dielectric property measurements, and lab-scale microwave hybrid calcination tests. This technology shows potential to increase the speed of lime production by enhancing the reaction rate, which will significantly reduced energy consumption. Production scale implementation of MAT? calcining is projected to save trillions of BTU/yr in the lime and cement industries. This work is supported through a Department of Energy Industrial Grand Challenge grant.
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