Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 24    No. 8    August 2014

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Extraction of vanadium from molten vanadium bearing slag by oxidation with pure oxygen in the presence of CaO
Wen-chen SONG1,2, Hong LI1,2, Fu-xing ZHU3, Kun LI1,2, Quan ZHENG1,2

1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing,
Beijing 100083, China;
2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing,
Beijing 100083, China;
3. State Key Laboratory for Comprehensive Utilization of Vanadium and Titanium Resources,
Pangang Group Research Institute Co., Ltd, Panzhihua 617000, China

Abstract:A novel process of vanadium extraction from vanadium slag in its molten state was conducted at the laboratory scale by oxidation with pure oxygen in the presence of CaO. The effect of mass ratio of CaO to V2O5 on the recovery of vanadium was studied. The sintered samples were leached by H2SO4 solution and characterized by XRD, XPS, SEM and EDS techniques. Compared with the roasting process, the energy saving effect of the proposed process was also discussed. The results showed that vanadium-rich phases were formed and vanadium mainly existed in the forms of CaV2O5 and Ca2V2O7. The formation mechanism of calcium vanadates in the molten vanadium bearing slag was explained. The XRD and XPS results implied that there was a limit to the oxidation reaction of V(IV) to V(V) under the high temperatures even though oxygen-supply was sufficient. An increase in the CaO content led to an increase in the formation of Ca2V2O7. About 90% of the vanadium recovery was obtained under optimal experiment conditions (mass ratio of CaO to V2O5 of 0.6, particle size 120 to 150 μm, leaching temperature 90 °C, leaching time 2 h, H2SO4 concentration 20%, liquid to solid ratio 5:1 mL/g, stirring speed 500 r/min). The energy of 1.85×106 kJ could be saved in every 1000 kg of vanadium bearing slag using the proposed process from the theoretical calculation results. Recovery of vanadium from the molten vanadium bearing slag and utilisation of its heat energy are important not only for saving metal resources, but also for energy saving and emission reduction.

 

Key words: molten vanadium bearing slag; CaO; oxidation; acid leaching; vanadium recovery; energy saving effect

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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