YANG Biao1,2, DAI Zhong-fang1, ZHANG Da-cheng1, CHENG Cheng1, GUO Lin-jia1, GUO Xiang1
(1. School of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, China;
2. Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming 650500, China)
Abstract: The acquisition of dielectric properties of minerals is the basis of analysis and design in microwave heating applications. In microwave metallurgy, the dielectric properties of minerals are directly related to some key issues such as mineral heating rate, energy utilization efficiency, and the development of new processing technologies. The macroscopic dielectric properties of polymetallic minerals are related to the ratio, composition, size, and local microstructure of various kinds of particles, resulting in the difficult acquisition of dielectric properties. In this work, a model on the basis of the structural abstraction pseudo-two-phase algorithm is proposed to calculate the dielectric properties of polymetallic minerals. The proposed approach is applied to study a polymetallic mineral which is composed of six units of mineral components, and to calculate the dielectric constant and dielectric loss of minerals. The results show that the calculated values of the equivalent dielectric constant and dielectric loss are respectively consistent with those calculated by using the Maxwell-Garnett's theoretical formula, indicating that the calculated results using the algorithm of equivalent dielectric properties of polymetallic minerals are capable to approach the dielectric properties of minerals. It thus proves that the proposed algorithm model for calculating pseudo-two-phase dielectric properties of polymetallic minerals has potential value of application in the microwave metallurgy.
Keywords: Polymetallic mineral; microwave metallurgy; pseudo two-phase algorithm; dielectric constant; dielectric loss
ACTA MINERALOGICA SINICA Vol. 40, No.1, 2020, page 9-15
