Wang, and two co-authors, reported in 2015 on a novel technology characterized by higher extraction of vanadium and recovery of valuable elements was developed to recover vanadium from stone coal. Stone coal is defined as a combustible, low-heat value, high-rank black shale of early Paleozoic (in a few cases, Permian) age, widely distributed in southern China.
The brief flow of the novel technology mainly includes low temperature sulphation roasting, water leaching, recovering potassium, aluminum, copper and
selenium, solvent extraction enrichment vanadium, precipitation of red vanadium, removal sodium from red vanadium and calcinations. The total recovery of vanadium reached 78.3%, which was higher than the current applied technology.
The novel technology was environmentally-friendly and could extraction vanadium from the stone coal, in which the content of V2O5 was
less than 0.8%.
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