Multiphysics study of microwave irradiation effects on rock breakage system

Teimoori, Khashayar; Cooper, Richard G.

doi:10.1016/j.ijrmms.2020.104586

Cited by 44 publications

(17 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to the different dielectric constants of minerals, thermal stress with non-uniform distribution is generated under microwave irradiation, which causes thermal fracture and weakens the ability of resisting external load. In summary, microwave irradiation can improve the production efficiency of hard rock excavation, drilling, and breaking [26,27].…”

Section: Introductionmentioning

confidence: 99%

Study on Magnetite Ore Crushing Assisted by Microwave Irradiation

Hao

2021

Minerals

View full text Add to dashboard Cite

High energy consumption in ore crushing brings great challenges to the mining industry. Microwave irradiation provides a promising solution for rock breaking. However, there is currently a lack of detailed understanding of the microwave parameters regarding magnetite ore. The purpose of this study is to fully understand the potential value of microwave irradiation applied in auxiliary crushing of magnetite ore. It is typically found that increasing power reduces the mechanical properties of ore, increasing energy utilization, and crushing degree, more than extending time. Based on wave impedance, this reveals the dependence of energy utilization on thermal damage. Increasing irradiation power, time and cooling rate will cause more transgranular cracks and cleavage tears in the crushed ore. Based on the separate microwave response of several minerals, the microwave-damage mechanism of magnetite ore is further demonstrated.

show abstract

Section: Introductionmentioning

confidence: 99%

Study on Magnetite Ore Crushing Assisted by Microwave Irradiation

Hao

2021

Minerals

View full text Add to dashboard Cite

show abstract

“…In these conventional methods, heat is transferred by thermal conduction and convection, which could be significantly influenced by the geology formation (e.g., aquicludes and faults). Therefore, to eliminate such disad-vantages, microwave treatment as a promising approach for fracturing and breaking rocks has attracted extensive attention in recent decades [17]. When exposed to…”

Section: Introductionmentioning

confidence: 99%

Thermal Response and Mechanical Behaviors of Compact Basalts Induced by Microwave Irradiation

Zhang

Chen

et al. 2022

Geofluids

View full text Add to dashboard Cite

Microwave pretreatment could be an invaluable method to improve the efficiency of the rock breakage in the excavation and comminution operations. To investigate the influence of microwave irradiation on the thermal response and mechanical behavior of compact rocks, a series of physical and mechanical experiments were conducted on the nontreated and treated basalts. The mineral compositions of the basalts were obtained by X-ray diffraction (XRD) test. Scanning electron microscope (SEM) images and geological sketch were utilized to analyze the propagation pattern of the microcracks and macrofractures caused by the microwave irradiation. High power density microwave can induce the complication of the microcracks and exchange the pattern of the macrofracture network. Based on the uniaxial compression strength (UCS) test, the mechanical performance of the basalts was evidently reduced with the increase of the microwave power and exposure time. The experimental results prove that microwave-assisted method has significant potential application to preweakening rocks in civil and mining engineering.

show abstract

“…Zhou et al [18] used the FEM to construct a heating model with a conveyor belt inside the heating chamber, and Yi et al [19] used the FEM to study microwave heating cavities with translational and rotational motion. In recent years, the use of the FEM has become particularly popular in microwave heating studies [20][21][22]. However, this method usually transforms the heating model into a high-dimensional system of ordinary differential equations during the solution process [23], which is not conducive to the design of microwave heating controllers [24].…”

Section: Introductionmentioning

confidence: 99%

“…However, this method usually transforms the heating model into a high-dimensional system of ordinary differential equations during the solution process [23], which is not conducive to the design of microwave heating controllers [24]. With the improvements in computer technology, various commercial softwares (e.g., FDTD Solutions and COMSOL Multiphysics) based on these methods (e.g., FDTD [13,14] and FEM [16][17][18][19][20][21][22]) have emerged, which provide a good interactive interface and enable researchers to carry out simulation experiments without knowing the internal mechanism. This will also greatly hinder researchers' understanding of the internal mechanism of microwave heating.…”

Section: Introductionmentioning

confidence: 99%

Method for Solving the Microwave Heating Temperature Distribution of the TE10 Mode

et al. 2022

View full text Add to dashboard Cite

Microwave heating is a process in which the electric, magnetic, and temperature fields are coupled with each other and are characterised by strong non-linearity, high time variability, and infinite dimensionality. This paper proposes a method for predicting the microwave heating temperature distribution of the TE10 mode, because the traditional numerical calculation method is not conducive to designing microwave controllers. First, the spatial distribution of the main electromagnetic mode TE10 waves in a rectangular waveguide was analysed using the principal mode analysis method. An expression for the transient dissipated power and a heat balance equation with infinite-dimensional characteristics were constructed. Then, the microwave heating model was decomposed into electromagnetic and temperature field submodels. A time discretization approach was used to approximate the transient constant dielectric constant. The heating medium was meshed to solve the electric field strength and transient dissipated power in discrete domains, and the temperature distribution was obtained by substituting this value into the finite-dimensional temperature field submodel. Finally, the validity of the proposed numerical model was verified by comparing the results with the numerical results obtained with the conventional finite element method. The methodology presented in this paper provides a solid basis for designing microwave heating controllers.

show abstract

Multiphysics study of microwave irradiation effects on rock breakage system

Cited by 44 publications

References 29 publications

Study on Magnetite Ore Crushing Assisted by Microwave Irradiation

Study on Magnetite Ore Crushing Assisted by Microwave Irradiation

Thermal Response and Mechanical Behaviors of Compact Basalts Induced by Microwave Irradiation

Method for Solving the Microwave Heating Temperature Distribution of the TE10 Mode

Contact Info

Product

Resources

About