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

摘要:

采用还原焙烧-磁选工艺，对铁品位31．9，，REO品位3．16，，Nb2 O5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120 min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-0．074 mm占85．4，，磁选强度为80 mT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 ，Nb2 O5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．

Abstract:

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 .