Clean production process for vanadium oxide

Abstract

The invention relates to a method for cleanly producing vanadium oxide, 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 cleanly producing the vanadium oxide which not only can obtain a high-quality vanadium product, but also can ensure that vanadium waste water can be reclaimed. The method for producing the vanadium oxide comprises the following steps: preparing roasting raw materials, calcification roasting; infiltrating, separating solid and liquid, precipitating vanadium by ammonium salt, calcining for deaminating or reducing, and the like. Waste water after vanadium extraction can be returned to a system for recycling after the waste waster is subjected to 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.

Description

technical field [0001] The invention relates to a clean production method of vanadium oxide, which belongs to the field of vanadium oxide extraction. Background technique [0002] The traditional sodium salt vanadium extraction process is based on Na 2 CO 3 、Na 2 SO 4 Common sodium salts such as NaCl or NaCl are used as additives, roasted with vanadium-containing raw materials at high temperature, the vanadium in the raw materials is oxidized to +5 by oxygen in the air, and combined with sodium salts to form sodium vanadate which is easily soluble in water. The roasted product is leached with water, sodium vanadate is dissolved into the solution, and after solid-liquid separation, the vanadium-containing solution is washed with CaCl 2 After removing the main impurities such as P and Si, add (NH 4 ) 2 SO 4 , NH 4 Cl, (NH 4 ) 2 CO 3 or NH 4 NO 3 Wait for the ammonium salt, and adjust the pH of the solution to 1.5-2.5, heat the solution to above 90°C for 40-90 minu...

AI Technical Summary

Problems solved by technology

[0006] Since the 1960s and 1970s, there have been some inherent defects in the process of extracting vanadium from sodium salts: (1) The CaO content in the vanadium slag is strictly limited, and the CaO content in the slag is generally required to be less than 1.5%, because the slag For every 1% increase in CaO in the medium, the yield of vanadium will decrease by about 4.7% to 9%; (2) the consumption of sodium salt and ammonium salt is relatively large, and the cost is high; (3) a large amount of sodium salt and ammonium salt in the wastewater pollute the environment

This method reduces the total amount of ammonia-containing wastewater, but still requires deammonization and desodium wastewater treatment, so the technical and economic problems of difficult treatment and high cost of ammonia nitrogen wastewater still exist, and because the treatment process is long and links increase, vanadium The recovery rate of the

[0010] So far, there are no relevant reports that can obtain high-quality vanadium products and completely solve the discharge or recycling of vanadium extraction wastewater

Images