Abstract In order to recover vanadium from vanadium-bearing black shale efficiently, a hydrometallurgical process is developed in this paper to treat the concentrate beneficiated from stone coal ore, in which the vanadium mainly occurs in the form of Fe3-xVxO4 spinel. At the first step, the leaching behaviors of Fe and V from the concentrate by using sulfuric acid solution are investigated in detail. The extraction rates of vanadium and iron could reach 92.5% and 98.5% respectively under the optimum leaching conditions of leaching temperature of 90 °C, sulfuric acid concentration of 25 wt%, leaching time of 90 min, L/S mass ratio of 30 and stirring speed of 600 rpm. Secondly, the iron impurity in the pregnant solution is removed efficiently by the precipitation method with Fe2O3 as nucleating agent. The effect of pH value, the amount of Fe2O3 nucleating agent and the precipitating time on the removal of iron and losing of vanadium are systematically investigated, and thereby >99.7% iron impurity can be removed with the loss rate of vanadium not higher than 2.5%. Finally, vanadium is precipitated from the purified leach solution as ammonium poly-vanadate by adding ammonium sulfate, and then the product of V2O5 is obtained by calcining the ammonium poly-vanadate. The purity of V2O5 powder can reach 92.0% approximately.

中文翻译：

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石煤选矿尖晶石精矿硫酸浸提回收钒

摘要 为了有效地从含钒黑色页岩中回收钒，本文开发了湿法冶金工艺处理石煤矿石选矿精矿，其中钒主要以Fe3-xVxO4尖晶石形式存在。第一步，详细研究了硫酸溶液对精矿中Fe和V的浸出行为。在浸出温度90 ℃、硫酸浓度25 wt%、浸出时间90 min、L/S质量比为30和30的最佳浸出条件下，钒和铁的提取率分别达到92.5%和98.5%。搅拌速度600转/分。其次，以Fe2O3为成核剂，采用沉淀法有效去除母液中的铁杂质。pH值的影响，系统研究了Fe2O3成核剂的用量和脱铁、脱钒的沉淀时间，可脱除99.7%以上的铁杂质，钒损失率不高于2.5%。最后，通过加入硫酸铵，从纯化的浸出液中以多钒酸铵的形式沉淀出钒，再将多钒酸铵煅烧得到V2O5产物。V2O5粉体纯度可达92.0%左右。再将多钒酸铵煅烧得到V2O5产物。V2O5粉体纯度可达92.0%左右。再将多钒酸铵煅烧得到V2O5产物。V2O5粉体纯度可达92.0%左右。