Method for producing vanadia by extraction technology

The invention relates to a method for producing vanadium oxide by an extraction technology, which belongs to the field of extraction of vanadium oxide. The technical problems to be solved by the invention is to provide the method for producing the vanadium oxide which not only can obtain a high-quality vanadium product, but also can completely solve standard drainage and reclamation of vanadium extracted waste water. The method for producing the vanadium oxide by extraction technology comprises the following steps: preparing roasting raw materials; calcification roasting; infiltrating; separating solid and liquid; extraction, precipitating vanadium; and treating waste water. Waste water after vanadium extraction can be returned to a system for recycling after the waste waster is subjectedto neutralizing treatment by lime cream so as to realize zero drainage of the waste water. The method also improves the reclamation rate of vanadium to be superior to that of the prior process, and reduces production cost. Through combining with other technologies, the method can change extracted slag and other waste into secondary resource to be used once again, and realize clean production.