Effect of calcified roasting-microwave acid leaching on leaching of iron and vanadium from steel slag
LIANG Jing-long, SHAO Xue-ying, WANG Le, LI Xiang-chen
Key Laboratory of Ministry of Education for Modern Metallurgy Technology, College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063000, Hebei, China
Abstract：In order to study the influence of calcified roasting parameters for vanadium-containing steel slag on the efficiency of vanadium extraction, vanadium-containing steel slag from Chengde, Hebei Province was taken as raw material and CaO was added as roasting additive. The microwave equipment was used to heat acid leaching. The leaching rules of elements V and Fe were investigated by different roasting temperature, time and calcium ratio, and the mechanism of action was revealed. Thermodynamic calculation result shows that spinel phase has been oxidized and decomposed in the temperature range of 700-1 100 ℃. The experimental results show that the leaching rate of V increases from 36.96% to 40.56% under different roasting temperatures. When the roasting time is extended to 5 h, the leaching rate decreases, because the refractory silicate phase is formed with the longtime of oxidation roasting. When the roasting temperature is 1 000 ℃, the time is 3 h, and the calcium ratio is 8%, the leaching rate of V can reach 50.06%, and the dissolution rate of Fe is 19.89% under the same conditions, which not only effectively recovers vanadium resources, but also inhibits the leaching of impurities.
梁精龙, 邵雪莹, 王乐, 李相臣. 钙化焙烧-微波酸浸对钢渣中钒铁浸出的影响[J]. 中国冶金, 2023, 33(4): 111-118.
LIANG Jing-long, SHAO Xue-ying, WANG Le, LI Xiang-chen. Effect of calcified roasting-microwave acid leaching on leaching of iron and vanadium from steel slag[J]. China Metallurgy, 2023, 33(4): 111-118.
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2023, Vol. 33 
