矿石微波预处理的数值模拟分析
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摘要
以黄铁矿矿石为研究对象建模,利用ANSYS软件对模型进行有限元分析,得到矿石颗粒在微波作用下的温度、应力分布及作用规律,探究微波作用下矿石强度弱化的细观力学损伤机理。分别建立矿物单质立体模型、方解石基质包裹的单颗粒黄铁矿平面模型以及多黄铁矿颗粒平面模型,仿真结果表明:黄铁矿为微波吸收型,温度呈线性增长;方解石性质影响应力峰值以及初始裂纹的产生;黄铁矿颗粒粒度大,矿石以剪切屈服为主,反之,以拉伸屈服为主。
Based on pyrite ore as the research object,the finite element analysis of the model was carried out by means of ANSYS software. The temperature,the stress distribution and the action law of the ore particles under the microwave irradiation were studied. The mechanism of micromechanical damage of ore weakening under microwave irradiation was explored. The single substance model,single-particle pyrite plane model wrapped by calcite and multi-particle plane model were established respectively. The simulation results show that the pyrite is a microwave absorption type and the temperature increases linearly. The calcite properties affect the peak stress and the initial crack generation. If the particle granularity of pyrite is large,shear yield is the main form of damage. On the contrary,tensile yield is the main form.
Based on pyrite ore as the research object,the finite element analysis of the model was carried out by means of ANSYS software. The temperature,the stress distribution and the action law of the ore particles under the microwave irradiation were studied. The mechanism of micromechanical damage of ore weakening under microwave irradiation was explored. The single substance model,single-particle pyrite plane model wrapped by calcite and multi-particle plane model were established respectively. The simulation results show that the pyrite is a microwave absorption type and the temperature increases linearly. The calcite properties affect the peak stress and the initial crack generation. If the particle granularity of pyrite is large,shear yield is the main form of damage. On the contrary,tensile yield is the main form.
引文
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[2]YICAI WANG,NENAD DJORDJEVIC.Thermal stress FEM analysis of rock with microwave energy[J].International Journal of Mineral Processing.2014,130:74-81.
[3]AMANKWAH R K,KHAN A U,PICKLES C A,et al.Improved grindability and gold liberation by microwave pretreatment of a free-milling gold ore[J].Mineral Processing and Extractive Metallurgy Review,2005,114:30-36.
[4]胡仁喜,康士延.ANSYS 15.0热力学有限元分析从入门到精通[M].北京:机械工业出版社,2016:11-17.
[5]彭金辉,刘秉国.微波煅烧技术及其应用[M].北京:科学出版社,2013:4-7.
[6]秦立科,戴俊.微波照射下矿物颗粒温度分布及影响因素分析[J].矿冶工程,2015(3):96-98.
[7]韩清凯,孙伟,王伯平,等.机械结构有限单元法基础[M].北京:科学出版社,2014:1-27.
[8]蔡美峰,何满朝,刘东燕.岩石力学与工程[M].北京:科学出版社,2013:1-62.
[9]鲁稳.Drucker-Prager系列屈服准则在岩土稳定分析中的应用研究[D].广州:华南理工大学,2014.