难选鲕状赤铁矿焙烧磁选和直接还原工艺的探讨.pdf

28 5 矿 冶 工 程 V o.l 28 ! 5 2008 10 M INING ANDM TALLURG ICAL NGIN RING O ctober 2008 沈慧庭, 周 波, 黄晓毅, 张延军, 林乡伟 ( , 530004) : , , : , 850 45 m in 61. 60% , 96. 65% ; , , 1050 5. 0 h, 89% 90% 85% : ; ; ; ; : TD92 : A : 0253- 6099( 2008) 05- 0030- 05 Roastingmagnetic Separation andDirectReduction of aRefractoryOolitichematiteOre SHEN Huiting, HOU bo, HUANG X iaoy,i HANG Y anjun, LIN X iangwei (R esources and Env ironm ent Co lleg e, G uangx i Un iv ers ity, N ann ing 530004, Guangx i, Ch ina ) Abstract: Roastingmagnetic separation and direct reductionmethodswere used to treat an oolitichematite ore under la boratory conditions to producemagnetite concentrate and sponge iron respectively. The influences of processing param e ters such as reduction tmi e, temperature and reductant dosage on both processes were investigated. The results show that, using anthracite as the reductan,t amagnetite concentratew ith an iron grade of 61. 60% and a recovery of 96. 65% can be obtained by magnetic separation of the ore preroasted at 850 for 45m inutes. M eanwhile, a sponge iron w ith a grade of 89% , ametallization rate of 90% and a recovery of 85% can be obtained from themagnetic separation of ore prereducted directly at 1050 for 5 hoursw ith the m ixture of anthracite and calcium carbonate as reductants. Key words: oolitichematite; roasting; m agnetic separation; direct reduction; sponge iron , , , 1 [ 1] , , 1. 1 , [ 2] , 1 9% , [ 3] 1 () /