还原剂种类对钛磁铁矿直接还原-磁选制备钛酸镁的影响  

The Effect of Reductant Type on the Purity of Magnesium Titanate Prepared by Direct Reduction and Magnetic Separation of Titanomagnetite

作　　者：徐承焱[1] 吴世超 肖晶晶 孙体昌[1] 李召春 Xu Chengyan;Wu Shichao;Xiao Jingjing;Sun Tichang;Li Zhaochun(School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China;Chengde Baiquan Iron Mine of Hesteel Group Mining Company,Chengde 271100,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]河钢集团矿业公司承德柏泉铁矿,河北承德271100

出　　处：《金属矿山》2020年第3期126-131,共6页Metal Mine

基　　金：国家自然科学基金项目(编号:51874017,51674018)。

摘　　要：为了提高钛磁铁矿直接还原法制备钛酸镁的纯度,研究了5种不同的还原剂对海砂弱磁选钛磁铁矿精矿直接还原焙烧生成钛酸镁纯度的影响,并采用扫描电镜和EDS能谱对其进行机理分析。结果表明,添加80%还原剂的手工生球团在1300℃下恒温焙烧180 min,经磁选可得到不同产率和Fe含量的钛酸镁产品,使用无烟煤、褐煤、焦炭、烟煤和木炭做还原剂时,磁选所得的钛酸镁的产率依次为36.50%、31.59%、31.47%、29.80%和23.91%;使用无烟煤作为还原剂时,所得钛酸镁产品中杂质Fe含量最高,为25.11%,其次为烟煤15.06%,焦炭13.47%,褐煤11.77%,木炭11.08%。机理分析表明,无烟煤和烟煤为还原剂时,焙烧球团边缘部分的钛磁铁矿还原效果较好,但是焙烧球团中心部分存在大量的钛磁铁矿未被还原,生成的钛酸镁颗粒中铁含量高;焦炭和褐煤为还原剂时,焙烧球团边缘部分生成的钛酸镁颗粒中铁含量明显降低,但焙烧球团中心部分生成的钛酸镁颗粒中铁含量较边缘部分高,所得钛酸镁产品的纯度偏低;木炭为还原剂时,焙烧球团边缘部分和中心部分生成的钛酸镁中的铁含量基本一致,均较低,所得到钛酸镁颗粒纯度较高,可实现钛磁铁矿直接还原制备高纯钛酸镁产品。In order to improve the purity of magnesium titanate prepared by direct reduction of titanomagnetite,the effect of five different reductants on the purity of magnesium titanate produced by direct reduction roasting using seaside sand low-intensity magnetic separation concentrate was studied,and the mechanism was analyzed by scanning electron microscope and EDS analysis.The results showed that magnesium titanate products with different yields and iron contents could be obtained by magnetic separation after the handmade pellets with 80%reductant were roasted at a constant temperature of 1300℃for 180 min.When anthracite,lignite,coke,bituminous coal and charcoal were used as reductants,the yields of magnesium titanate obtained by magnetic separation were 36.50%,31.59%,31.47%,29.80%and 23.91%orderly.When anthracite was used as reductant,the impurity iron content of magnesium titanate products was up to 25.11%,followed by bituminous coal 15.06%,coke 13.47%,lignite 11.77%,and charcoal 11.08%.The mechanism analysis showed that when anthracite and bituminous coal were used as reductants,the reduction effect of titanomagnetite at the edge of roasted pellets were better,but a large amount of titanomagnetite in the center of roasted pellets was not reduced,resulting in high iron content in magnesium titanate particles.When coke and lignite were used as reductants,the content of iron in magnesium titanate particles generated at the edge of roasted pellet decreased significantly,but the content of iron in magnesium titanate particles generated at the center of roasted pellet was higher than that at the edge,resulting in lower purity of magnesium titanate products.When charcoal was used as reductant,the iron content of magnesium titanate generated from the edge part is low as the center part of the roasted pellet,thus the obtained magnesium titanate particle purity was higher,which could realize the direct reduction of titanium magnetite to produce high-purity magnesium titanate products.

关 键 词：钛磁铁矿 还原剂 直接还原 磁选 钛酸镁纯度 

分 类 号：TD95[矿业工程—选矿] TD924