Cosolvent for dissolving ammonium metavanadate and preparation method thereof

The invention relates to a cosolvent for dissolving ammonium metavanadate and a preparation method thereof.The cosolvent is prepared from, by mass, 15%-25% of monoethanolamine, 10%-20% of urea, 20%-35% of ethidene diamine, 15%-25% of propylene glycol, 5%-10% of oxalic acid, 0.05%-1% of a defoaming agent, 1%-5% of an emulsifier and 10%-30% of deionized water.The preparation process includes the steps that firstly, monoethanolamine, urea, ethidene diamine and propylene glycol are taken according to different proportions and put into a reaction kettle; after the reaction is completed, preparing a cosolvent precursor; secondly, adding a defoaming agent, an emulsifying agent, deionized water and oxalic acid into the precursor, uniformly mixing, and cooling to room temperature to obtain a product. The cosolvent prepared by the method has the advantages of low melting point, high dissolution efficiency, good stability and the like, and the addition of oxalic acid and monoethanolamine in the cosolvent enables the pre