某难选钒矿提取钒实验研究

Experimental Study on Vanadium Extraction from Refractory Vanadium Ore

甘肃某钒矿矿物组成较为复杂,嵌布粒度较细,浮选工艺处理困难。针对该矿石复杂性质,实验对其进行了直接酸浸工艺、焙烧-酸浸工艺、焙烧-碱浸出工艺、焙烧-水浸出工艺的研究。实验结果表明焙烧-酸浸工艺效果较佳,其较佳条件为:原矿磨矿细度-0.074 mm 70%,加水制粒Φ8~20 mm,干燥后焙烧1.5 h,焙烧温度为800℃。焙烧矿磨至-0.074 mm 60%,酸浸硫酸用量为12%,液固比1.2∶1,浸出时间1 h,浸出温度30℃,在此条件下可获得钒浸出率为93.36%的贵液。采用的工艺技术路线解决了该难选钒矿采用常规湿法提钒工艺钒浸出率低、硫酸消耗量大等技术难题,为实现资源高效利用及保障国家能源资源安全奠定了坚实的技术基础。

The vanadium ore of Gansu was difficult to treat with flotation process for the complex composition and superfine dissemination size.Experiments of acid direct leaching vanadiferous,roastingacidic leaching,roasting-alkali leaching and roasting-immersion were taken to research this refractory vanadium ore.The results showed that the roasting-acidic leaching process had better effect,and the pregnant solution with vanadium leaching rate 93.36%could be achieved,under optimal conditions of raw ore grinding fineness-0.074 mm 70%,Φ8~20 mm granulation,1.5 h roasting time,800℃rosting temperature,-0.074 mm 60%of baked ore,12%sulfate,1.2:1 of liquid-solid ratio,1 h leaching,30℃of reaction temperature.The adopted process technology route has solved the technical problems such as low vanadium leaching rate and large consumption of sulfuric acid in the conventional wet vanadium extraction process for the refractory vanadium ore,and laid a solid technical foundation for realizing the efficient utilization of resources and ensuring the safety of national energy resources.