(1.昆明理工大学冶金与能源工程学院，云南昆明，650093；
2. 复杂有色金属资源清洁利用国家重点实验室，云南昆明，650093；
3. 微波能工程应用和装备技术国家地方联合工程实验室，云南昆明，650093)
摘 要: 本文以低品位磁铁矿为原料，高温微波箱式炉加热预处理，对比研究连续加热和脉冲间歇式加热两种微波方式对矿石可磨性的影响。主要以粒度-20+10mm的样品作为研究对象，通过调整微波功率、加热时间、间歇方式等参数，获得连续微波加热的最佳条件为：微波功率1000W、加热120s，可获得-0.075mm物料质量分数达87.32%，与直接磨矿相比提升了14.32%；脉冲间歇加热的最佳参数为：微波输出功率1000W，微波加热10s-间歇30s，总预处理时间200s，可获得-0.075mm物料含量89.75%，比直接磨矿高出16.75%。SEM分析表明，磁铁矿经微波辐射处理，有用矿物和脉石间产生裂纹，促进脉石和矿物的分离。综上，间歇加热处理矿石比连续处理的助磨效果更好且能耗更低。
关键字: 微波助磨；间歇式微波加热；磁铁矿；磨矿效果
（1. School of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming，650093,China;
2. State Key Laboratory of Clean Utilization of Complex Non-ferrous Metal Resources, Kunming 650093,China;
3. National and Local Joint Engineering Laboratory for Microwave Energy Engineering Application and Equipment Technology, Kunming 650093,China）
Abstract:In this paper, the raw material, low-grade magnetite, was pre-treated by microwave continuous heating and pulsed intermittent heating respectively in high-temperature microwave box furnace to compare the different effects of each methods on the improvement of grindability. The sample with a particle size of -20+10mm is mainly selected as the research object. By adjusting the parameters of microwave power, heating time, and intermittent mode, the best conditions for continuous microwave heating are: microwave power of 1000W and heating for 120s, the mass fraction of -0.075 mesh materials can reach 87.32%; The optimum parameters for pulsed intermittent heating are: microwave output power of 1000W, microwave heating for 10s-intermittent for 30s, total pretreatment time for200s, and 89.75% of -0.075 mesh materials can be obtained. SEM analysis shows that microwave radiation treatment of magnetite concentrate produced cracks between valuable minerals and gangue, which promotes the separation of gangue and minerals. In summary, intermittent heat treatment of ore has a better grinding aid effect and lower energyconsumption than continuous treatment.
Key words: microwave-assisted grinding; pulse microwave heating; magnetite; grinding effect
