(1. 昆明理工大學冶金與能源工程學院，昆明 650093；
2. 復雜有色金屬資源清潔利用國家重點實驗室，昆明 650093；
3. 微波能工程應用和裝備技術(shù)國家地方聯(lián)合工程實驗室，昆明 650093)
摘 要: 本文以低品位磁鐵礦為原料，通過高溫微波箱式爐加熱預處理，對比研究微波連續(xù)加熱和脈沖加熱兩種方式對礦石可磨性的影響。以粒度-20+10 mm的礦樣作為研究對象，通過調(diào)整微波功率、加熱時間、脈寬、周期等參數(shù)，獲得兩種微波加熱方式的最佳條件。結(jié)果表明：連續(xù)加熱的最佳參數(shù)為微波功率1000 W、加熱120 s，可獲得粒度-0.075 mm的物料質(zhì)量分數(shù)達87.32%，比直接磨礦提高了14.32%；脈沖間歇加熱的最佳參數(shù)為微波輸出功率1000 W、微波加熱10 s+間歇30 s、總預處理時間200 s，可獲得粒度-0.075 mm物料質(zhì)量分數(shù)達89.75%，比直接磨礦高出16.75%。SEM分析表明，磁鐵礦經(jīng)微波輻射處理，有用礦物和脈石間產(chǎn)生裂紋，促進脈石和礦物的分離，脈沖間歇加熱方式的助磨效果比連續(xù)處理加熱方式更好且能耗更低。
關(guān)鍵字: 微波助磨；磁鐵礦；脈沖間歇式加熱；連續(xù)加熱；磨礦效果
（1. Faculty of Metallurgical 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 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+10 mm was mainly selected as the research object. The results show that, by adjusting the parameters of microwave power, heating time, pulse width and pulse period, the best conditions for continuous microwave heating are microwave power of 1000 W and heating for 120 s, the mass fraction of materials with particle size of -0.075 mm can reach 87.32%, which is 14.32% higher than that of direct grinding. The optimum parameters for pulsed heating are microwave power of 1000 W, microwave heating for 10 s+intermittent for 30 s, and total pretreatment time for 200 s, the mass fraction of materials with particle size of -0.075 mm can reach 89.75%, which is 16.75% higher than that of direct grinding. The SEM analysis shows that the microwave radiation treatment of magnetite concentrate produces cracks between valuable minerals and gangue, which promotes the separation of gangue and minerals. In summary, the microwave pulsed heating treatment of ore has a better grinding aid effect and lower energy consumption than the microwave continuous heating treatment.
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