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 Cl2,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 H2SO4 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.

Qing Lin;Guoquan Zhang;Kun Wang;Dongmei Luo;Siyang Tang;Hairong Yue

School of Chemical Engineering,Sichuan University,Chengdu 610065,China

中国化学工程学报（英文版）

[1]Qing Lin;Guoquan Zhang;Kun Wang;Dongmei Luo;Siyang Tang;Hairong Yue-.Two-stage cyclic ammonium sulfate roasting and leaching of extracting vanadium and titanium from vanadium slag)[J].中国化学工程学报（英文版）,2022(07):39-47

Two,stage,cyclic,ammonium,sulfate,roasting,leaching,extracting,vanadium,titanium,from,slag,Compared,traditional,sodium,calcification,process,extraction,raw,AS,could,reduce,about,temperature,avoid,Cl2,HCl,containing,waste,water,gypsum,discharging,To,amount,added,two,acid,proposed,result,analysis,indicates,be,decomposed,using,Using,total,mass,Ti,extracted,after,initial,concentration,H2SO4,spinel,phase,1st,residue,would,efficiently,by,Furthermore,valence,not,changed,but,part,oxidized,2nd

0.428871