从低品位稀土铌铁粗精矿中分离回收铁和稀有金属的新工艺

A new method about the separation and recovery of iron and rare metals from RE-Nb-Fe rough concentrate with low grade

采用还原焙烧-磁选工艺,对铁品位31.9%,REO品位3.16%,Nb2O5品位2.91%的稀土铌铁粗精矿进行分离回收铁和稀土、铌的研究.结果表明:在硫酸钠活性炭粉添加质量分数分别为15%和5%、还原焙烧温度为1100℃、还原焙烧时间为120min的条件下,对稀土铌铁预富集粗精矿进行还原焙烧.然后在还原焙烧产物磨矿细度为-0.074mm占85.4%,磁选强度为80mT的条件下进行磁选,最终可获得铁品位89.32%、回收率91.47%的金属铁粉,稀土、铌富集物的REO,Nb2O5品位分别为5.36%和4.62%,回收率分别为96.09%和95.83%的指标.实现了稀土铌铁粗精矿中铁和稀土、铌的有效分离和回收.

Fe ,RE ,Nb separation and recovery from RE-Nb-Fe rough concentrate with total iron grade of 31 .9% ,REO grade of 3 .16% and Nb2 O5 grade of 2 .91% was studied by reduction roasting-magnetic sepa-ration .It was found that metallic iron powder with total iron grade of 89 .32% and the iron recovery of 91 .47% were obtained when RE-NB-Fe enrichment rough concentrate was reduction roasted first at 1100℃ for 120 min using sodium sulfate dosage about 15% ,then magnetic separated using the grinding fineness of ores less than 0 .074 mm 85 .4% and the magnetic field intensity about 800 mT .REO grade is 5 .36% and Nb2 O5 grade is 4 .62% in rare earth ,niobium concentrate with the REO recovery of 96 .09%and the Nb2O5 recovery of 95 .83% .The effective separation and recovery of iron ,rare-earth and niobium from RE-Nb-Fe associated rough concentrate was carried out