硫酸焙烧对石煤提钒过程的影响  

Effect of Sulfuric Acid Roasting on Vanadium Extraction from Stone Coal

作　　者：师启华 张一敏[1,2] 刘涛[1,2] 黄晶[1,2] 付朝阳[1,2] 

机构地区：[1]武汉科技大学资源与环境工程学院,武汉430081 [2]湖北省页岩钒资源高效清洁利用工程技术研究中心,武汉430081

出　　处：《有色金属（冶炼部分）》2015年第7期38-42,共5页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51474162)

摘　　要：采用硫酸焙烧—浸出工艺从某难处理石煤中提钒,分析了硫酸焙烧及浸出过程中矿物物相及微观结构的变化。结果表明,当加入0.25mL/g硫酸在200℃焙烧1.5h后,按液固比(mL/g)为1.2在80℃浸出60min的条件下,钒浸率可达到85.57%。硫酸焙烧过程中方解石转变为硬石膏,含钒云母结构被破坏,同时生成硫酸铝钾晶相,矿物微观结构疏松多孔。与传统酸浸工艺相比,硫酸焙烧—浸出工艺的焙烧温度低、浸出过程无助浸剂、浸出时间短、浸出率高、能耗低。Vanadium was extracted from refractory stone coal by sulfuric acid roasting and leaching process.Main phase changes and mineral microstructure during roasting and leaching were analyzed.The results show that vanadium leaching rate is 85.57% under the optimum conditions including dosage of sulfuric acid of 0.25mL/g,roasting temperature of 200℃,roasting time of 1.5h,and leaching ratio of liquid to solid of 1.2（mL/g）at 80 ℃ for 60 min.During roasting,calcite converts to anhydrite,vanadium-bearing muscovite is thoroughly broken down and aluminum potassium sulfate is generated,mineral microstructure became loose and porous.Compared with conventional acid leaching,sulfuric acid roasting and leaching process has the advantages of low roasting temperature,no assistant leaching agent,short leaching time,high vanadium leaching rate,and low energy consumption.

关 键 词：石煤 钒 硫酸焙烧 浸出 

分 类 号：TF841.3[冶金工程—有色金属冶金]