微波辐射参数及冷却方式对石英型赤铁矿石损伤的试验研究OA

[Purposes]This work is conducted to explore more effective methods for assisting in mining and crushing hard iron ore and provide theoretical basis for optimizing engineering parame-ters.[Methods]An experimental study was conducted on the heating characteristics,cracks,and damage evolution of quartz type hematite ore under different microwave powers,radiation time,and cooling methods by using a self-developed single-mode microwave generator.[Results]The re-sults indicate that:Under experimental conditions,the overall temperatures of quartz type hematite samples increase linearly with the increases of microwave power and radiation time.The fractal dimen-sion of crack width,crack volume ratio,and crack distribution complexity of samples increase linearly with the increases of cooling amplitude and cooling rate.The sample with a microwave radiation pow-er of 3 kW and a radiation time of 3 min shows a 64.7%,73.9%,78.7%,and 83.9%decrease in wave velocity after natural cooling,water immersion cooling,liquid nitrogen cooling for 10 min,and liquid nitrogen cooling for 2 h,respectively.The cumulative damage factors of the sample are 0.88,0.92,0.95,and 0.97,respectively.[Conclusions]The experimental results can provide a basic the-oretical basis for selecting microwave radiation quartz type hematite as an auxiliary rock breaking meth-od and parameter optimization in engineering practice.