CAJ | 학술논문

针对川南低品位硫铁矿烧渣，采用磁化焙烧-磁选工艺开展选铁试验研究，探索了主要的工艺参数，研究了选铁尾矿的火山灰活性。结果发现，原烧渣在800℃、配加煤粉（2%，质量分数）的条件下，磁化焙烧30 min，能够有效将赤铁矿转化为磁铁矿；经“1粗1精1扫”3段磁选流程选别得到的铁精矿品位可达60.54%。将选铁尾矿再磨至D90为43μm时，28 d活性指数高达94.3%，满足高强高性能混凝土用矿物外加剂的活性要求。
침대천남저품위류철광소사，채용자화배소-자선공예개전선철시험연구，탐색료주요적공예삼수，연구료선철미광적화산회활성。결과발현，원소사재800℃、배가매분（2%，질량분수）적조건하，자화배소30 min，능구유효장적철광전화위자철광；경“1조1정1소”3단자선류정선별득도적철정광품위가체60.54%。장선철미광재마지D90위43μm시，28 d활성지수고체94.3%，만족고강고성능혼응토용광물외가제적활성요구。
The iron concentrate were separated by magnetic concentration and magnetizing roast from low grade pyrite cinder which was collected from southern Sichuan. The main process parameters and pozzolanic activity of tailings were studied. The results showed that hematite can be effectively reduced to magnetite while adding 2% coal (mass fraction) and roasting 30 min at 800℃. Total iron content of concentrate of magnetic separation can reach 60.54% by one roughing, one cleaning and three scavengings. While theD90 of tailings was 43μm, 28 day activity index was 94.3%. So the tailings are good mineral admixtures of high strength and high performance concrete.