Method of electrolyzing anode to leach vanadium in normal temperature saturated oxalic acid solution

Abstract

The invention relates to a method of electrolyzing an anode to leach vanadium in a normal temperature saturated oxalic acid solution. The method comprises the following steps: adding an adhesive intoferrovanadium spinel vanadium concentrate as an initial raw material to be mixed and carrying out pressing and forming and reducing roasting to prepare the anode; carrying out an electrolytic reactionby taking the saturated oxalic acid solution as an electrolyte, wherein in the electrolytic process, ferrum and vanadium in the anode are oxidized to high valence ions to carry out a complex reactionwith oxalate and enter the solution finally in forms of [Fe(C2O4)3]3<->, VO2<+> or / and [VO(C2O4)2]3<->, [Fe(C2O4)3]3<-> and [VO(C2O4)2]3<-> promote leaching of vanadium in the vanadium concentrate, and meanwhile, pollution-free carbon dioxide gas is separated out on the surface of the anode and hydrogen is separated out on a cathode; and after the electrolytic reaction, carrying out solid-liquidseparation to obtain a vanadium containing lixivium. According to the method, by preparing the anode according to electrical conductivity of the ferrovanadium spinel, carrying out electrolysis by taking the oxalic acid as the electrolyte and forming a complex by combining the oxalate ions with ferrum and vanadium, the vanadium concentration is promoted to dissolve and vanadium is oxidized and leached efficiently. The method is mild in operating condition, can be carried out at constant temperature and constant pressure, and is simple in process, pollution-free and low in cost.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and relates to a method for leaching vanadium from vanadium-iron-spinel-type minerals by electrolysis, in particular making soluble anodes into vanadium-iron-spinel-type vanadium-containing concentrates and directly electrolyzing them in oxalic acid electrolyte solution , to obtain vanadium-containing leaching solution. Background technique [0002] Vanadium is an important alloying element widely used in machinery, aviation, electronic technology, defense industry and other industries, so its production has attracted much attention. At present, the sources of vanadium are mainly vanadium-titanium magnetite and vanadium-containing stone coal. The vanadium-titanium magnetite is smelted in a blast furnace and enters molten iron, and then blown in a converter to obtain vanadium slag. Vanadium iron spinel phase in vanadium slag is the main phase containing vanadium. The grade of vanadium in stone c...

AI Technical Summary

Problems solved by technology

However, there are still many deficiencies in this method. The electrolytic solution uses potassium hydroxide as the electrolyte, which increases the production cost, and the concentration of potassium hydroxide is relatively large, and the corrosion is strong; before the electrolysis reaction, it is necessary to mix the vanadium slag with the potassium hydroxide aqueous solution Heating, thereby increasing energy consumption; during the electrolysis process, it is necessary to continuously feed oxidizing gas into the reaction system, which increases production costs and brings safety hazards

Images