Study on Process of Vanadium Extraction from Acid Leaching Solution of Power Generation Ash of High-Carbon Stone Coal by D201 Resin AITranslate

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Chinese Library Classification Number:TF841.3[冶金工程—有色金属冶金]

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The ion exchange method was used to purify the acid leaching solution of power generation ash from high-carbon stone coal vanadium ore after blank roasting and enrich vanadium.The influence of different factors on vanadium adsorption and desorption was studied,and the optimal process conditions for adsorption and desorption were determined.The results show that the acid leaching solution has a pH value of 2.3,and can directly undergo ion exchange without neutralization.The order of vanadium adsorption capacity of various resins is D201>D380>D314>D202,the mixed desorption agent of NaOH and NaCl is the best in the desorption process,and the appropriate mass ratio of the two is 3∶1.The optimal dynamic adsorption conditions of D201 resin are as follows:the sodium chlorate dosage is 0.05 times the mass of V₂O₅,and the feed rate per hour is 2 times the resin volume.The V₂O₅adsorption capacity is 186 mg/g and 283 mg/g,respectively when c/c₀value is 0.5 and 0.8,and the adsorption rate is 98.53%when the resin is penetrated.When the D201 resin is desorbed with 6%NaOH+2%NaCl solution as the desorption agent,and the volume ratio of desorption solution to wet resin is 4.36,the V₂O₅content of the desorption solution reaches a peak of 75.46 g/L.When the volume ratio of desorption solution to wet resin is 7.44,the desorption rate of vanadium reaches 99.31%.The vanadium adsorption capacity of the desorbed D201 resin after regeneration by HCl is comparable to that of the new D201 resin.V₂O₅product with purity of 98.98%can be prepared by impurity removal,neutralization,vanadium precipitation and calcination of vanadium-rich solution obtained by desorption.