摘要
采用新型永磁材料Nd-Fe-B和挤压式磁系设计研制了永磁强磁预选设备,传送带表面磁感应强度可达1.0 T,磁场梯度最高可达68 mT/mm.对齐大山铁矿极贫赤铁矿-75 mm+50 mm,-50 mm+20 mm,-20 mm+5 mm,-5 mm+0 mm各粒级进行预选试验,一粗一扫两次选别,在入选矿石铁品位17%～18%的条件下,预选精矿铁品位提高5.3%～6.8%,回收率大于60%,尾矿铁品位约13%,抛尾产率大于50%.
A high-intensity permanent magnetic separator for pre-concentration was designed and developed with the new-type extruded permanent magnet made of Nd-Fe-B.Then,the magnetic induction on the surface of belt conveyor came up to 1.0 T with the maximum magnetic gradient up to 68 mT/mm.Pre-concentration tests were done for the extra-lean hematite from Qidashan Iron Mine,including the size fractions-75 mm＋50 mm,-50 mm＋20 mm,-20 mm＋5 mm,-5 mm＋0 mm—roughing and scavenging each once.After the pre-concentration,the Fe ore grade was improved by 5.3%～6.8% if the original grade was 17%～18%,i.e.,the recovery rate is higher than 60% and tailing grade around 13% with the yield of tailing higher than 50%.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第8期1187-1191,共5页
Journal of Northeastern University(Natural Science)
基金
国家高技术研究发展计划项目(2007AA06Z127)
科技部国际合作计划重点项目(2006DFB72570)
关键词
永磁强磁分选设备
预选
ND-FE-B
挤压式磁系
极贫赤铁矿
high-intensity permanent-magnetic separator
pre-concentration
Nd-Fe-B
extruded magnetic system
extra-lean hematite
