钡盐焙烧—酸浸某高碳页岩钒矿脱碳渣工艺研究

Treating Decarbonized Slag of High Carbon Shale Vanadium Ore by Barium Salt Roasting-Acid Leaching

研究了采用硫酸钡焙烧—硫酸浸出工艺从某高碳页岩钒矿经循环流化床燃烧发电产生的脱碳渣中提取钒,考察了磨矿细度、焙烧时间、焙烧温度、硫酸钡添加量、硫酸用量、助浸剂种类、浸出温度、浸出时间、液固体积质量比,以及二段浸出的硫酸用量对钒浸出率的影响。结果表明:脱碳渣首先在磨矿细度-200目占90%、硫酸钡添加量4%、焙烧温度900℃条件下焙烧16 h,再在硫酸用量6%、浸出温度25℃、浸出时间2 h、液固体积质量比2∶1条件下进行二段逆流浸出,钒浸出率可达75%左右;所得浸出液无需中和处理,可直接进行后续净化富集。

The process of barium sulfate roasting—sulfuric acid leaching was used to extract vanadium from the decarbonized slag of a high carbon shale vanadium ore produced by circulating fluidized bed combustion for power generation.The effects of grinding fineness,roasting time,roasting temperature,barium sulfate addition,sulfuric acid dosage,leaching agent type,leaching temperature,leaching time,liquid volume to solid mass ratio and two-stage leaching on vanadium leaching rate were investigated.The results show that the decarburized slag is first roasted for 16 h under the conditions of-200 mesh grinding fineness of 90%,barium sulfate addition of 4%,roasting temperature of 900℃,and then the two-stage countercurrent leaching is carried out under the conditions of sulfuric acid dosage of 6%,leaching temperature of 25℃,leaching time of 2 h,liquid volume to solid mass ratio of 2∶1,the vanadium leaching rate can reach about 75%.The leaching solution can be directly purified and enriched without neutralization treatment.