| Abstrakt: |
In modern metallurgical industry, microwave thermal technique has many advantages as one efficient energy treatment in an electromagnetic form, such as internal self-generated heat, easy access to control a volumetric heating process, and consensus on cleanliness, convenience and high efficiency of energy use. Both permittivity and permeability of molybdenite concentrate were measured for a further discussion about its electromagnetic heating coupling. A bidirectional coupling physics field in numerical modeling was undertaken to evaluate the microwave absorption potential and dielectric heating performance of molybdenite concentrate by the multi-physics finite element method. The electromagnetic morphology and the field distribution strength were described in the microwave reaction cavity. The electromagnetic field strength and the dissipation coefficient induced by temperature variation were represented throughout the whole heat chamber and at key parts of interest. Dependent temperature distribution was compared with that being obtained from a scenario by thermal conduction with a stable heat source. The molybdenite concentrate would be heated at surrounding temperature up to 593 °C for 10 min by microwave energy that was transmitted by a rectangular waveguide. Scanning electron microscopy (SEM) patterns suggested that the polished and neat crystalline molybdenum trioxide (MoO3) products were achieved by the microwave heating process. The superiority via utilizing microwave thermal technique is expounded in the preparation strategy for molybdenum oxide or molybdenum metal. [ABSTRACT FROM AUTHOR] |
