甘肃某含钪低品位钛铁矿石综合利用试验

甘肃某含钪低品位钛铁矿石Fe、TiO_2、Sc_2O_3含量分别为10.20%、4.55%和55.6 g/t,磁性铁仅占总铁的17.90%,钛铁矿形式的铁占总铁的22.02%,硅酸盐形式的铁占总铁的52.05%;钛铁矿形式的钛占总钛的69.01%,钛磁铁矿中钛占总钛量的3.52%,其余的钛主要赋存在难以富集和回收的硅酸盐矿物中。磁铁矿嵌布粒度主要为0.5～0.04 mm,钛铁矿嵌布粒度主要为1～0.07 mm,二者嵌布关系密切,混杂充填在硅酸盐矿物粒间,钪主要以类质同象形式存在于深色钙镁酸盐类矿物(主要为角闪石)中。为了确定该矿石的开发利用工艺,进行了选矿试验研究。结果表明,6～0 mm矿石经重磁拉选矿机预选抛出29.82%的含泥粗粒尾矿后,在阶段磨选情况下(二段磨矿细度为-0.074 mm占81%),采用1粗(135.4 k A/m)2精(119.4 kA/m和119.4 kA/m)弱磁选流程选铁,选铁尾矿采用1粗(0.7 T)1精(0.6 T)高梯度强磁选流程预富集钛,强磁选钛精矿经1粗1扫4精、中矿顺序返回流程选钛,最终获得Fe品位为60.78%、Fe回收率为13.11%的铁精矿,TiO_2品位为47.05%、TiO_2回收率为55.74%的钛精矿和Sc_2O_3品位为99.0 g/t、Sc_2O_3回收率为48.68%钪精矿。

Comprehensive Utilization Test of a Low Grade Scandium-containing Ilmenite in Gansu Province

The contents of Fe， TiO₂ and Sc2O3 in a low-grade scandium-containing titanium iron ore in Gansu Province are 10.20%， 4.55% and 55.6 g/t， respectively. The magnetic iron accounted for only 17.90% of the total iron， the iron in the form of ilmenite accounted for 22.02% of the total iron， and the iron in the form of silicate accounted for 52.05% of the total iron. TiO2 in the form of ilmenite accounts for 69.01% of the total titanium， and TiO2 in titanomagnetite accounts for 3.52% of the total titanium. The remaining titanium mainly occurs in silicate minerals that are difficult to be enriched and recovered. The size of magnetite is mainly 0.5~0.04 mm， and the size of ilmenite is mainly 1~0.07 mm. They are closely intermingled with silicate minerals. Scandium is mainly found in dark calcium magnesium minerals （mainly amphibole）. In order to determine the exploitation and utilization technology of the ore， the beneficiation test was carried out. The results show that under the condition of 6~0 mm， the tailings of 29.82% can be removed by ZCLA. Then， under the grinding fineness of -0.074 mm accounted for 81%， the iron concentrate with TFe grade of 60.78%， recovery rate of 13.11%；the titanium concentrate with TiO₂ grade of 47.05%， recovery of 55.74% and the scandium concentrate with Sc₂O₃ grade of 99.0 g/t， recovery of 48.68% can be obtained by one roughing （135.4 kA/m） two cleaning （119.4 kA/m and 119.4 kA/m） low magnetic separation process， and the iron tailings are pre-enriched by one roughing （0.7 T） one cleaning（0.6 T） high gradient high intensity magnetic separation process， and the titanium concentrate with high intensity magnetic separation by sequential return process of one roughing， four cleaning， one scavenging.