磁—浮联合工艺回收某钒钛磁铁矿石中钛铁矿试验

为了回收陕西某难选原生钒钛磁铁矿石中的钛铁矿资源,在对矿石进行工艺矿物学研究基础上,对干式中磁抛废后的矿石进行了强磁预选—反浮选脱硫—浮选选钛工艺试验。结果表明:1该矿石属含硫高磷低品位钒钛磁铁矿石,钛主要以钛铁矿形式存在,占总钛的67.66%,主要呈浸染状产出,常发生榍石化,沿钛磁铁矿边缘或粒间嵌布,少数零星出现在脉石中;硫主要以黄铁矿形式存在;脉石矿物主要为透辉石、绿泥石、角闪石、斜长石等硅酸盐矿物。2矿石经粗粒中磁干式抛废—弱磁选铁—强磁预选富集钛—反浮选脱硫—浮选提纯钛铁矿的工艺流程处理,实现了对难选钛铁矿的高效回收,最终获得铁品位为55.12%、含钛10.17%、铁回收率为44.20%的铁精矿,以及Ti O2品位为48.01%、回收率为51.84%的钛精矿。实现了钛铁矿与比磁化系数接近的铁硅酸盐矿物等的有效分离。

Experimental Research on the Recycle of Ilmenite from a Vanadium Titanium Magnetite Ore by the Combined Magnetic-flotation Process

To retrieve ilmenite from a refractory vanadium titanium magnetite ore in Shaanxi Province,a combined process including high intensity magnetic pre-concentration,desulfurization via reverse floatation,titanium floatation for the dry rough concentrate based on process mineralogy tests was conducted.The results showed that:①The ores is one kind of lowgrade vanadium titanium magnetite ore with sulphur and high phosphorus.Titanium mainly exists in the form of ilmenite which contributes to 67.66％ of the total titanium composition.The titanium is mainly disseminated in the ores and is embedded along the edges of the ore or intergranular with the ores,and a small proportion is in the form of gangues.Sulfur mainly exists in the form of pyrite and the gangues contain silicate such as diopside,chlorite,amphibole and plagioclase.②By the combined process including dry rough magnetic separation for tailing removal,low intensity magnetic separation,iron selection,titanium pre-enrichment by high intensity magnetic separation,desulfurization via reverse floatation and purification of ilmenite by floatation,the efficient recycling of titanium from the ores was achieved.In final,iron concentrate with Fe grade of 55.12％,titanium grade of 10.17％ and Fe recycling rate of 44.20％,and titanium concentrate with TiO2 grade of 48.01％ and the recovery rate of 51.84％ were achieved.The proposed process could realize efficient separation between ilmenite and iron silicate with similar magnetization coefficient.