石煤钒矿焙砂加压碱浸试验

来源期刊：钢铁钒钛2010年第3期

论文作者：肖超 肖连生 丁文涛

文章页码：6 - 9

关键词：石煤； 钒； 碱性浸出； 加压浸出

Key words：stone coal； vanadium； alkaline leach； pressure leach

摘    要：针对目前采用"焙烧—碱浸提钒"工艺从石煤钒矿中提取钒存在碱消耗大、浸出时间长和浸出液杂质含量高等问题,研究采用高压碱浸法浸出石煤钒矿焙砂。试验考察碱用量、液固比、浸出时间、循环浸出等因素对钒浸出率的影响。结果表明,在NaOH用量为矿重的3.5%,液固比为1.5∶1,180℃下,2h浸出,钒的浸出率达到86%,浸出液中钒硅质量浓度比为0.65,浸出液pH值约为12.1。高压碱性浸出具有钒浸出率高,杂质浸出率低等优点,为石煤提钒提供了一个新的途径。

Abstract: Considering that extracting V₂O₅ from coal-stone by "roasting-alkali leaching " process exist some serious problems such as abundant alkali consumption,long leaching time and leaching solution with high impurity content and so on,the experiment of extracting V₂O₅ from stone coal calcine by pressure alkaline leaching was investigated,and effects of dosage of sodium hydroxide,liquid-solid ratio,leaching time,recycle leaching on the vanadium leaching were studied.The results showed that when sodium hydroxide 3.5% of ore calcine weight,the ratio of liquid-solid 1.5∶1,leaching temperature 180℃,leaching time 2h,the leaching rate of vanadium in stone coal is 86%,mass ratio of vanadium and silicon is 0.65,and pH of the leaching solution is 12.1.High-pressure alkaline leaching process with the advantage of high leaching rate of vanadium but low leaching rate of other impurities,provides a new way for extracting V₂O₅ from stone coal.