(1. 武漢理工大學(xué) 資源與環(huán)境工程學(xué)院，武漢 430070；
2. Department of Mining Engineering, Faculty of Engineering Sciences, Omdurman Islamic University, Omdurman 382, Sudan;
3. Department of Mineralogical and Geological Sciences, Faculty of Sciences, University of Burundi, Bujumbura 1550, Burundi)
摘 要: 以新疆某含鐵(FeT)47.04%、含Pb 0.39%、含Zn 0.30%的難選鐵礦石為試樣，采用化學(xué)分析、顯微鏡觀察鑒定、EPMA和EDS等手段，考察其化學(xué)成分、鐵鉛鋅的物相組成及鉛鋅雜質(zhì)礦物的產(chǎn)出特征，探討影響選礦工藝的礦物學(xué)因素與選礦前景。結(jié)果表明：含鐵礦物中主要組合為赤褐鐵礦、高達(dá)91.35%，少量磁性鐵和硅酸鐵；含鉛雜質(zhì)主要為氧化鉛和鉛鐵礬中的鉛，分別占49.0%和41.3%(質(zhì)量分?jǐn)?shù))；而氧化鋅中的鋅為主要含鋅雜質(zhì)，占比90.6%。試樣中可見少量閃鋅礦、方鉛礦及黃鐵礦等雜質(zhì)礦物，而未發(fā)現(xiàn)含鉛鋅的氧化狀態(tài)晶質(zhì)礦物產(chǎn)出。EPMA和EDS分析表明：氧化狀態(tài)的鉛鋅雜質(zhì)呈單獨(dú)或共同產(chǎn)出形式，且鋅的產(chǎn)出更為普遍和廣泛；鉛含量多為2.89%~3.89%(質(zhì)量分?jǐn)?shù))不等，而鋅含量多處于0.67%~1.17%(質(zhì)量分?jǐn)?shù))之間。預(yù)計(jì)強(qiáng)常規(guī)磁選與浮選工藝均難于取得有效排除鉛鋅雜質(zhì)的效果，建議采用高溫還原焙燒預(yù)處理工藝。
關(guān)鍵字: 難選鐵礦石；雜質(zhì)；礦物學(xué)；產(chǎn)出特征；電子探針
（1. School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China;
2. Department of Mining Engineering, Faculty of Engineering Sciences, Omdurman Islamic University, Omdurman 382, Sudan;
3. Department of Mineralogical and Geological Sciences, Faculty of Sciences, University of Burundi, Bujumbura 1550, Burundi）
Abstract:A refractory iron ore containing 47.04% iron (total Fe content), 0.39% Pb and 0.30% Zn was used as a sample in Xinjiang Uygur Autonomous Region, China. The chemical analysis, microscopic observation and identification, EPMA with EDS were used to investigate the chemical composition, phase composition of iron, lead and zinc, and the occurrence and output characteristics of lead and zinc impurity minerals. The mineralogical factors and mineral process prospects affecting the beneficiation process were discussed in proper order. The results show that the iron-bearing minerals are mainly hematite, with content up to 91.35%, and a small amount of magnetic iron and iron silicate. The lead-containing impurities are mainly lead oxide and lead in plumbojarosite, accounting for 49.0% and 41.3%, respectively. While zinc in zinc oxide is the main zinc-containing impurity, accounting for 90.6%. A small amount of impurity minerals, such as sphalerite, galena, and pyrite are found in the sample, but no crystalline minerals in the oxidation state containing lead and zinc are found. EPMA and EDS analysis indicates that the lead and zinc impurities in the oxidized state are in the form of separate or common output, and the output of zinc is more general and extensive. The lead content ranges from 2.89% to 3.89%, while the zinc content is in the range of 0.67% to 1.17%. It is expected that strong conventional magnetic separation and flotation processes are difficult to achieve the effect of effectively eliminating lead and zinc impurities, and high temperature reduction roasting is recommended as a pre-treatment process before separation.
Key words: refractory iron ore; impurities; mineralogy; occurrence characteristics; electron probe micro analysis
