【作者】 李解； 张邦文； 李保卫； 赵瑞超；

【Author】 Li Jie~(1,2) Zhang Bangwen~2 Li Baowei~2 Zhao Ruichao~2 (1.Inner Mongolia University of Industry;2.Institute of Metallurgy,Inner Mongolia University of Science and Technology)

【机构】 内蒙古工业大学； 内蒙古科技大学冶金研究所；

【摘要】 研究了粗铌精矿经微波磁化焙烧后的弱磁选工艺过程。试验选取磁化效果最佳的焙烧矿,重点探讨弱磁选磁场强度、磨矿粒度及分散剂的加入对磁选指标的影响。结果发现:随着磁场强度和磨矿粒度的减小,铁的回收率和产率逐渐降低,铁品位逐渐升高。其中,80 kA/m磁场下、33μm磨矿粒度的焙烧矿的磁选指标最佳。采用阶段磨矿工艺,铁品位由初选的51.1%提高到62.5%,且细磨有利于铁与铌的分离,特别是磁选分散剂(工业酒精)的加入,使铁精矿品位由57.2%提高到60.5%的同时,将Nb富集在尾矿中,铌品位为5.01%。对含铌尾矿进行酸浸提铌后,浸出物Nb的品位提高到12.36%,与原矿相比铌富集了4倍多。更多还原

【Abstract】 The low intensity magnetic separation process was studied for the low - grade Nb - concentrate by microwave magnetic roasting.The influence of magnetic density,particle size of grinding and dispersant addition on the magnetic separation effect of sinter ore with the best magnetisability was investigated emphatically.The results showed that the recovery and productivity of iron were decreased and the grade of iron increased gradually with the decreasing of magnetic density and particle size of grinding.The magnetic separation result of sinter ore was optimal under the magnetic density of 80kA / m or the grain -size of grinding of 33μm.By stage grinding,the grade of iron was improved from 51.l%to 62.5%.And fine grinding was effective to make Fe separate from Nb,especially the dispersant(industrial alcohol) was used in the process of magnetic separation,which made the grade of iron be improved from 57.2%to 60.5%and Nb enriched to tailing ore(the grade of Nb was 5.01%).After acid pickling of tailing ore containing Nb,the grade of Nb in the extract was improved to 12.36%,which enriched more four times than that of low - grade Nb - concentrate before magnetic separation.更多还原