The invention discloses a novel method for extracting
vanadium pentoxide from stone
coal-
vanadium ore, which comprises the following steps: the stone
coal-
vanadium ore is crushed, then is directly added with water for wet ball milling, and then is sent into a reaction kettle to stir to leach through acid adding and pressurization, leaching pulp is subjected to
solid-liquid separation to obtain
leachate, the
leachate is pretreated and then is extracted, concentrated and purified, a strip liquor after the extraction is used to precipitate
ammonium poly-
vanadate, and then a vanadium
pentoxide product is obtained through the thermolysis. The method has the advantages of high
automation degree of production process, convenient operation, and steady and reliable operation; the yield of vanadium is more than 75 percent, the production cost is lower than those of a
sodium method and a normal pressure acid leaching method, the consumption of
sulfuric acid is only one third of that of the normal pressure acid leaching method, the
grinding of ores adopts a wet
ball mill; the method does not bake, has no
pollution to the environment, fully utilizes mineral resources and
thermal energy, shortens more than one time of leaching time, saves the
thermal energy, and reduces the cost; the production process can not destroy the carbon content in the stone
coal-vanadium ore, and leaching residue can be used for generating
electricity, producing
cement, baking bricks and tiles and so on.