某超低品位钒钛磁铁矿选钛工艺探讨

Discussion on Ilmenite Separation from the Iron Tailings of a Ultra-low Grade Vandium-titanium Magnetite Ore

某超低品位钒钛磁铁矿选铁尾矿TiO2品位极低,仅为3.33%,可回收金属矿物为钛铁矿,主要脉石矿物为橄榄石、辉石、长石和角闪石;品位低、橄榄石含量高是该矿石的两大特点,如何高效预富集及分选成为制约其开发利用的关键因素。针对选铁尾矿性质,采用强磁抛尾-强磁精矿再磨-摇床富集联合预选工艺可将TiO2品位由3.33%提升至29.19%,作业回收率50.12%;预选精矿进一步浮选可获得TiO2品位45.80%、浮选作业回收率为76.68%的钛精矿产品,对选铁尾矿TiO2回收率达到38.43%,通过联合工艺使超低品位钒钛磁铁矿具备经济利用价值。

An ultra-lowgrade vanadium titanomagnetite was used to prepare iron tailings with a very low TiO2 grade of 3.33%.The recoverable metal minerals were ilmenite,and the main gangue minerals were olivine,pyroxene,feldspar and amphibite.Low grade and high olivine content are the two characteristics of the ore.How to preconcentrate and separate the ore efficiently is the key factor restricting its development and utilization.According to the properties of iron tailings preparation,the combination of high-intensity magnetic tail-throwing-high-intensity magnetic concentrate regrinding-shaker enrichment combined pre-processing technology can increase the TiO2 grade from 3.33% to 29.19%,and the recovery rate is 50.12%.Further flotation of pre-selected concentrate can obtain titanium concentrate products with TiO2 grade of 45.80% and flotation recovery rate of 76.68%,and the recovery rate of TiO2 for iron tailings reaches 38.43%.Through combined process,ultra-low grade vanadium titanium magnetite has economic utilization value.