| The main energy of traditional pyrometallurgical process is fuel and electricity, it will causelarge energy consumption environmental pollution problems. Microwave heating as a new kind ofclean heating technology has been used in the field of metallurgy, microwave heating can make theconventional method of ore difficult processing easier processing. The heat absorption power ofpower generated by microwave radiation is closely related to its complex permittivity, so theaccurate measurement of the complex dielectric constant of metallurgy materials is of greatsignificance.This paper introduces the present status of the development of the domestic and internationalmedia materials measurement methods. The advantages and disadvantages of various mediacomplex permittivity test methods are analyzed in detail. Based on the testing requirements ofmetallurgical materials, the cylindrical resonant cavity method is selected. According to the principleof the complex permittivity of the cylindrical cavity method, the characteristic equation of acylindrical resonance cavity loaded material is deduced. A cylindrical resonance cavity working atTM020mode is designed, the variable temperature from room temperature1000℃test system ofthe complex permittivity of metallurgical materials is fabricated. Study on the measurement of thecomplex permittivity of partially filled material in a cylindrical resonance cavity at the same time,the complex permittivity of partially filled material is calculated by artificial neural networks. Thismethod provides a new way to measure large dielectric constant or large loss materials usingcylindrical resonance cavity. Then, the testing software of complex permittivity based on accuratefield method is written, the variable temperature measurement of the metallurgical complexpermittivity is completed, a test software of BP neural network model is compiled and test thecomplex permittivity of the filling material. Variable sources of error for the test results are analyzed,and the relative dielectric constant and loss tangent error formula are given. The system features are:（1） testing temperature: room temperature1000℃; Test frequency:2450±50MHz （pointfrequency）;test sample shape: powdery material.（2） testing range: permittivityε’r:2to100, loss tangenttanδ：5×10-3-2（3） The test error: room temperature:|△ε’/ε’|≤2.0%,|△tanδ|≤10%tanδε+3×10-3; high temperature: |△ε’/ε’|≤4.5%,|△tanδ|≤15%tanδε+5×10-3... |
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