The invention specifically relates to a method for extracting
vanadium from
vanadium-containing stone
coal. The technical plan is: first crush the
vanadium-containing stone
coal to a particle size of <3mm, raise the temperature to 700~900°C, roast at a constant temperature for 1~2 hours, cool and
grind to obtain vanadium-containing stone
coal powder; Stirring and leaching with the vanadium-containing stone coal at a liquid-
solid mass ratio of (2.5~5)︰1 at 80~100°C for 1~4h, performing a stage of
solid-liquid separation, and the obtained stage leaching solution is used for subsequent purification and enrichment operations , the first-stage leaching residue is used in the second-stage acid leaching process; then prepare H2SO4 with a
volume concentration of 10-25% in the stirring leaching tank, and add 1-7wt of the first-stage leaching residue according to the liquid-
solid mass ratio (0.8~2)︰1 % CaF2, stirring and leaching at 80-100°C for 4-8 hours, and the second-stage solid-liquid separation, the obtained second-stage
leachate is the leaching agent for the first-stage acid leaching, and the second-stage leaching residue is the final
tailings. The invention has the advantages of high vanadium
leaching rate, low acid consumption, simple process for extracting vanadium from stone coal and strong continuous productivity.