高氯高铁型四氯化钛除钒尾渣焙烧提钒工艺研究  

Vanadium Extraction by Roasting from High Chlorine-and-Iron Titanium Tetrachloride Tailings After Vanadium Removal

作　　者：堵伟桐 姜丛翔 陈卓 居殿春 徐玉松 DU Wei-tong;JIANG Cong-xiang;CHEN Zhuo;JU Dian-chun;XU Yu-song(School of Metallurgy and Material Engineering,Jiangsu University of Science and Technology(Zhangjiagang Campus),Zhangjiagang 215600,Jiangsu,China;Suzhou Institute of Technology,Jiangsu University of Science and Technology,Zhangjiagang 215600,Jiangsu,China)

机构地区：[1]江苏科技大学张家港校区冶金与材料工程学院,江苏张家港215600 [2]江苏科技大学苏州理工学院,江苏张家港215600

出　　处：《矿冶工程》2022年第2期106-109,共4页Mining and Metallurgical Engineering

基　　金：江苏省自然科学基金青年项目(BK20210888);江苏省高等学校自然科学研究面上项目(20KJB450001,20KJD450001)。

摘　　要：针对氯化法生产钛白粉工艺中除钒固体废弃物难以有效再利用的问题,研究了除钒尾渣钠化焙烧-水浸脱氯提钒工艺中Na_(2)CO_(3)添加量、焙烧时间及温度对钒浸出率的影响,实现高氯高铁型四氯化钛除钒尾渣资源的二次利用。结果表明,采用液固比10 mL/g的水洗工艺,可大幅降低尾渣中NaCl对沉钒率的影响;水洗后的除钒尾渣在Na_(2)CO_(3)添加量20%、焙烧时间2 h、焙烧温度850℃条件下焙烧后水浸,钒浸出率达88.19%;按NH_(4)^(+)与V物质的量比2.5∶1向浸出液中加入(NH_(4))_(2)SO_(4),可得到NH_(4)VO_(3),经干燥、焙烧可得到粉状V_(2)O_(5)产品,其品位超过99.7%,全流程钒元素回收率81.38%。Due to being difficult to be reused effectively during the production of titanium dioxide by chlorination,the solid waste after vanadium removal was treated by the process consisting of sodium roasting and aqueous leaching for dechlorination and vanadium extraction,and the effects of adding amount of Na_(2)CO_(3),roasting time and temperature on vanadium leaching rate were investigated for realizing the secondary utilization of vanadium removal tailings resources of titanium tetrachloride with high contents of chlorine and iron.The results show that the influence of NaCl in tailings on vanadium precipitation rate can be greatly reduced by using water washing process with liquid-solid ratio of 10 mL/g;vanadium removal tailings after water washing are roasted at 850 ℃ for 2 h by adding Na_(2)CO_(3)at an amount of 20%,and then subjected to aqueous leaching,resulting in a vanadium leaching rate reaching 88.19%;by adding(NH_(4))_(2)SO_(4)into the leaching solution with NH_(4)^(+)/V molar ratio of 2.5∶ 1,NH_(4)VO_(3)can be generated.And then after drying and roasting,the powdered V_(2)O_(5)can be obtained with the grade over 99.7%.It is shown the recovery rate of vanadium from the whole process is 81.38%.

关 键 词：除钒尾渣 钠化焙烧 水浸 浸出率 五氧化二钒 

分 类 号：TF111[冶金工程—冶金物理化学]