Abstract: In light of the large water consumption in the stone coal calcine leaching for vanadium extraction, research test on the recycling of aqueous solution was made in a process consisting of two stage water leaching and one stage acid leaching. The test results show that when the aqueous solution is not recycled, the unit water consumption of leaching is 7.45 m³/t while when it is recycled in certain way, the water recycle rate can be as high as 83.8%,which can reduce the unit water consumption to only 1.25 m³/t and the tail water production from 7.45 m³/t to 1.25 m3/t accordingly, thus greatly reducing the pressure of tail water treatment. Moreover, the recycling of aqueous solution can enrich the vanadium in the leaching solution, reducing the pressure of the downstream processing of leaching solution and the vanadium loss by resin adsorption of the residual vanadium in the tail solution.

Key words: Stone coal calcine, Leaching for vanadium extraction, Aquesou solution of leaching, Recycling