非洲某风化型铌铁磷多金属矿选矿研究

Beneficiation Study on a Weathered Polymetallic Fe-Nb-P Ore in Africa

非洲某风化型铌铁磷多金属矿为风化壳复合烧绿石矿,原矿含Nb2O50.62%、含P2O58.28%,含Fe 13.91%,矿石风化严重,含泥量较高。根据矿石中烧绿石与脉石矿物之间的比重差异,采用重选实现有价矿物的预富集,磁铁矿具有强磁性,采用弱磁选回收磁铁矿,磷灰石和烧绿石具有可浮性差异,浮选实现磷灰石和烧绿石的分离回收。原矿首先经螺旋溜槽重选可以抛除产率为73.61%的尾矿,重选精矿磨细至-0.074 mm占78%,在磁场强度为0.45 T条件下,经弱磁选铁,获得了Fe品位61.69%,回收率38.83%的铁精矿,选铁尾矿以碳酸钠为调整剂、GY10为捕收剂,经1粗2精2扫磷浮选,获得了P2O5品位为37.59%,回收率为47.88%的磷精矿,选磷尾矿以SH为调整剂、GSC为捕收剂,经1粗2精2扫铌浮选,获得了Nb2O5品位37.56%,Nb2O5回收率65.73%的铌精矿。研究结果可以为该类风化铌矿的开发利用提供依据。

A weathered Nd-Fe-P polymetallic ore in Africa is a weathered crust composite pyrochlore ore,which containing Nb2O50.62%,P2O58.28%,Fe 13.91%,with severe ore weathering and high mud content.According to the difference in specific gravity between the valuable minerals and the gangue minerals in the ore,gravity separation is used to realize the pre-enrichment of valuable minerals.According to magnetite has high magnetism,magnetite is recovered by low intensity magnetic separation.According to apatite and calcite have flotability difference,apatite and calcite are recovered by flotation.The ore is firstly gravited by spiral chute to remove the tailings with a yield of 73.61%.The gravity separation concentrate is ground to-0.074 mm accounting for 78%.Under the condition of magnetic field intensity of 0.45T,an iron concentrate with Fe grade of 61.69%and recovery rate of 38.83%can be obtained through the low intensity magnetic separation.The iron tailings use sodium carbonate as the regulator and GY10 as the collector,after one roughing two cleaning two scavenging phosphorus flotation,phosphorus concentrate with P2O5 grade of 37.59%and recovery of 47.88%is obtained.The tailings of the phosphorus separation are adjusted by SH and the GSC is the collector,the niobium concentrate with Nb2O5 grade of 37.56%and recovery of 65.73%is obtained by one roughing two cleaning two scavenging niobium flotation.The research results can provide a basis for the development and utilization of such weathered antimony ore.