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采用颗粒流软件建立了基质为方解石、内含方铅矿颗粒的方铅矿二维模型,研究了脉冲微波功率密度、重复频率、脉宽、辐照时间对方铅矿微裂纹发育的影响。结果表明:由微波诱导产生的微裂纹集中在方铅矿和方解石的晶粒边界,并随辐照时间的增长呈发散状向周围扩展延伸,微裂纹类型以张性裂纹为主,剪切裂纹占极少比例;在输入能量相同的情况下,微波功率密度和辐照时间对矿石颗粒的损伤程度及微裂纹的发育有重大影响,高功率密度和短辐照时间比低功率密度和长辐照时间更有利于矿石颗粒内部微裂纹的发育;在一定范围内提高重复频率、增大脉宽有助于提高矿石颗粒内部微裂纹的发育程度及增大矿石颗粒的损伤程度,这有利于后续磨矿的进行;在其他条件一定的情况下,辐照时间并不是越长越好,选定最佳的最短辐照时间对于降低矿石的力学强度及减少能耗有重大意义。
A two-dimensional model of galena containing galena and galena particles was established by using particle flow software. The effects of pulse microwave power density, repetition frequency, pulse width and irradiation time on the development of galena microcracks were studied. The results show that the microcracks induced by microwaves concentrate on the grain boundaries of galena and calcite, and disperse and extend to the periphery with the increase of irradiation time. The types of microcracks are dominated by tension cracks and the shear cracks Accounting for a very small proportion. Under the same input energy, the microwave power density and irradiation time have a significant effect on the degree of damage of ores and the development of microcracks. The high power density and short irradiation time are lower than those of low power density and long radiation According to the time is more conducive to the development of micro-cracks within the ore particles; within a certain range to increase the repetition frequency and increase the pulse width will help to improve the degree of micro-cracks within the ore particles and increase the degree of damage of ore particles, which is conducive to follow-up Grinding under the conditions of other conditions, the irradiation time is not the longer the better, the optimal selection of the shortest irradiation time for reducing the mechanical strength of ore and reduce energy consumption of great significance.