Two-stage cyclic ammonium sulfate roasting and leaching of extracting vanadium and titanium from vanadium slag  

作　　者：Qing Lin Guoquan Zhang Kun Wang Dongmei Luo Siyang Tang Hairong Yue 

机构地区：[1]School of Chemical Engineering,Sichuan University,Chengdu 610065,China

出　　处：《Chinese Journal of Chemical Engineering》2022年第7期39-47,共9页中国化学工程学报（英文版）

基　　金：funded by National Natural Science Foundation of China(22008161).

摘　　要：Compared with traditional sodium or calcification roasting process for vanadium extraction from raw vanadium slag(V-slag),ammonium sulfate(AS)roasting could reduce about 470℃ roasting temperature and avoid Cl_(2),HCl,sodium-containing waste-water and waste gypsum discharging.To reduce the amount of AS added in vanadium extraction process,an efficient AS two-stage cyclic roasting and acid leaching process was proposed.The result of TG analysis indicates V-slag could be decomposed in 275-380℃ using AS roasting process.Using 2.03:1 total mass ratio of AS to V-slag,90.86%V and 80.54%Ti could be extracted after 380℃ roasting for 30 min and 8%initial concentration of H_(2)SO_(4) leaching at 70℃ for 100 min.XRD analysis indicates V-containing spinel phase in the 1st stage leaching residue would be efficiently decomposed by the cyclic two-stage roasting and leaching process.Furthermore,the valence of V(Ⅲ)in raw V-slag was not changed after the 1st AS roasting stage,but a part of V(Ⅲ)in the 1st leaching residue was oxidized to V(V)after 2nd roasting process.

关 键 词：VANADIUM Titanium ROASTING LEACHING 

分 类 号：X757[环境科学与工程—环境工程] TF841.3[冶金工程—有色金属冶金]