The invention relates to a method for extracting, separating and recovering
vanadium,
gallium and
scandium in pickle liquor by adopting a total extracting method and using
titanium dioxide
hydrolysis waste acid to leach steel
slag containing
vanadium, comprising the following steps of: mixing and stirring
titanium dioxide
hydrolysis waste acid and steel
slag containing
vanadium to obtain leaching pulp; performing
solid-liquid separation for the leaching pulp, totally extracting vanadium,
gallium and
scandium in filtered liquor with five-category return flow, then back-extracting vanadium and
gallium with five-category return flow, neutralizing with
ammonium bicarbonate or
ammonia water, warning up, precipitating vanadium to obtain
ammonium polyvanadate, repeatedly back-extracting and precipitating vanadium for precipitating-vanadium
mother liquor, and then recovering gallium; and when a back-extracting vanadium and gallium organic phase is repeatedly totally extracted and back-extracted till the content of
scandium in the back-extracting vanadium and gallium organic phase is 50-1000mg, recovering scandium. The invention has the beneficial effects that waste is treated with waste, namely vanadium, gallium and scandium are recovered by using
titanium dioxide
hydrolysis waste acid to leach steel
slag containing vanadium, and the
sulfuric acid cost is saved; the method has great social and
economic benefits and low production cost for producing gallium and scandium; without
roasting, no
waste gas is produced, and three wastes can be discharged with corresponding standards.