Hot acid leaching of vanadium from western phosphate beneficiation tailings
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Hot acid leaching of vanadium from western phosphate beneficiation tailings

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    "As part of its effort to develop ways to maximize resource recovery, the Bureau of Mines investigated the extraction of vanadium from western phosphate beneficiation tailings with h2so4 and/or h3po4. Dissolution of the vanadium was accomplished by digesting a mixture of acid and a 50-pct-solids, tailings-water slurry. In the most effective method investigated, vanadium and phosphorus were leached by digesting the slurry at a constant boiling temperature (100 deg.- 110 Deg. C) in a stirred reactor. In batch tests, maximum vanadium dissolution was 95 pct. In continuous-circuit tests designed to further evaluate vanadium dissolution at constant boiling temperature in a continuously stirred reactor, vanadium dissolution ranged from 70 to 85 pct. An economic evaluation of the process demonstrated that h2so4 consumption is the major cost factor. Based on the value of the vanadium product with no allowance for a phosphate product, the cost of producing the v205 is more than twice its value. The potential for profit would depend upon the value of the phosphate fertilizer produced from the impure h3po4 remaining after vanadium extraction." - NIOSHTIC-2 NIOSH no. 10004764
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