Study on leaching vanadium from roasted residue of stone coal

Minerals & Metallurgical Processing , 2008, Vol. 25, No. 4, pp. 181-184

He, D.; Feng, Q.; Zhang, G.; Luo, W.; Ou, L.

ABSTRACT:

In China, the total reserves of vanadium, reported as V₂O₅, in stone coal is 118 Mt (130 million st). Recovering vanadium from such a large resource is very important to China’s vanadium industry. The technology now being used to recover vanadium from stone coal has the following two problems in the leaching process: a low recovery of vanadium and high acid consumption. To resolve these problems, a new leaching technology is proposed. The effects of factors such as H₂SO₄ concentration, liquid-solid ratio, temperature and time, and the types and additions of additives were studied. By adding 1.5% (by weight) CaF₂ and leaching the roasted residue of stone coal with 5.4% (by weight) sulfuric acid at 90°C for 12 hours at a liquid-solid ratio of 2 mL/g, the leaching degree of vanadium reached 83.10%. This proposed leaching technology gives a feasible alternative for the processing of roasting residue of stone coal and can be applied in the comprehensive utilization of stone coal ores in China.