Abstract
The leaching of vanadium from carbonaceous shale using dilute H 2SO 4 was investigated, and the mechanism of leaching determined. The results showed that higher leaching efficiency of vanadium was obtained by increasing initial concentration of H 2SO 4, raising leaching temperature and prolonging leaching time. Addition of ammonium fluoride also enhanced recovery. A recovery of 92% was obtained using a liquid to solid ratio 4:1, initial H 2SO 4 concentration 18%, NH 4F addition 4.8 wt.% of carbonaceous shale, leaching temperature 95 °C and contact time 8 h; the recovery was only 56% without NH 4F. The presence of NH 4F enhanced the leaching of vanadiferous mica.
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