Microwave heating temperature rise characteristics of composite minerals under the circumferential stirring model
To investigate the microwave heating mechanism of composite minerals,a circum-ferential stirring model based on the Arbitrary Lagrangian-Eulerian(ALE)method was estab-lished by COMSOL Multiphysics software.This model aims to study the temperature rise characteristics of mineral models with different component structures and proportions.The re-sults show that the heating efficiency and uniformity of the mineral are higher in the stirred heating model with a 5 cm copper disc rotating at(π/3)rad/s compared to the non-stirred heating model;The different component structures of the composite mineral result in different electromagnetic wave distributions,which induces the microwave heating efficiency of the py-rite-enclosed calcite model is lower than the calcite-enclosed pyrite model;In the calcite-en-closed pyrite model,the variation of pyrite thickness changes the phase of electromagnetic wave,leading to the displacement of hot and cold spots in the mineral.Furthermore,when comparing the pyrite thicker and thinner than the penetration depth,there is a significant dis-parity in the incident electromagnetic wave intensity,resulting in noticeable differences in elec-tric field strength;At the same component proportion,the overall electric field of heterogene-ous minerals is lower and more stable,and the electric field intensity between components is closer than in composite homogeneous minerals;With the proportion of pyrite increases,the temperature variation of heterogeneous minerals after 30 s microwave heating can be divided into three regions:small peak region(0-10％),large peak region(10％-50％),and stable region(50％-75％),and the temperature differences between components gradually decrease.
microwave rock breakingnumerical simulationcomposite mineralsheating mechanism
NETL
NSTL
万方数据
