含钒石墨尾矿提钒技术研究

金溪石墨矿矿石中钒含量较高，研究表明矿石经石墨浮选后钒绝大部分都进入尾矿中，因此从尾矿中回收钒成为开发金溪石墨矿必须解决的问题。为此，根据矿石中钒的特点，在借鉴石煤提钒技术的基础上，对浮选试验获得的金溪石墨尾矿进行了提钒试验。试验结果表明：采用加酸焙烧-水浸-除钾铝-萃取-反萃取-氧化沉钒工艺，可使金溪石墨矿浮选尾矿中钒的浸出率、萃取率、反萃取率和沉淀率分别达到95.5%、87.6%、99.9%和99.0%，同时可获得对浮选尾矿产率分别为9.2%和23.2%的钾明矾和铵明矾；此外，浸出渣主要由硅酸盐组成，并具有较高的活性，可以作为水泥掺合料和生产建筑材料的原料。

Study on the Vanadium Extraction from Graphite Tailings

Jinxi graphite ore has high vanadium content. The research indicates that most of the vanadium reports to the tailings in graphite flotation. Therefore, how to recover the vanadium from the tailings has become an issue that should be addressed in exploiting Jinxi graphite ore. In light of the characteristics of the vanadium in the ore and by learning from the vanadium extraction technology from stone coal, vanadium extraction test is made from Jinxi graphite tailings of the flotation test. The result shows that the adoption of a process consisting of roasting with acid addition, water leaching, removal of potash and aluminum, extraction, back extraction and oxidation-vanadium deposition can achieve a vanadium leaching rate, extraction rate, back-extraction rate and deposition rate of 95.5%, 87.6%, 99.9% and 99.0% respectively. Meanwhile, potassium alum and ammonium alum can also be obtained, with their yields in terms of flotation tailings being 9.2% and 23.2% respectively. In addition, as the leaching residue mainly consists of silicate and has high activity, it can be used as the raw material for cement mix and building material.