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Calcification roasting was an effective and environment-friendly way to extract vanadium from vanadium slag. This paper presents a comprehensive study on industrial application of calcium roasting process for large rotary kiln. The study has highlighted the importance of temperature stability using MnVO4 for maximizing the recovery of the vanadium. The optimum conditions for recover 87.48–89.65% of vanadium (V) by using MnVO4 at M·Fe concentration 1±0.5%, CaO to V2O5 ratio 0.58–0.64, MnVO4 concentration 50–55%, feed rate 4.44±0.56 kg/s, rotate speed 87–90 s/r, temperature of T2 865±10°C, temperature control curves TE, TF, TG, negative pressure −10±5 Pa and volume flow ratio of the combustion air to coke oven gas (5–5.5). It was possible MnVO4 was not only the additive but also play a key auxiliary effect for CaO with vanadium (V) to Ca2V2O7 by studying on the oxidation reaction mechanism.

Industrial Application of Large Rotary Kiln for Recovery of Vanadium from Vanadium Slag Added MnVO<sub>4</sub> in Calcium Roasting Process