Experimental Study on Recovery of Tungsten from Acidic Solution by Ion Exchange Resin AITranslate

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Chinese Library Classification Number:TF841.1[冶金工程—有色金属冶金]

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In the acid leaching of scheelite,the decomposition method that tungsten is produced in the form of isopolytungstate provides a new way for scheelite smelting.However,the subsequent recovery of tungsten from the leaching solution of isopolytungstate matters.This paper compared the adsorption behaviors of different anion exchange resins in isopolytungstate solution and determined that the macroporous weak-base anion exchange resin D301 was the optimal resin.The effects of D301 resin dosage,solution pH,adsorption temperature,tungsten concentration,and adsorption time on the resin′s adsorption of tungsten were investigated.The results show that under the conditions of a resin dosage of 5 times the theoretical amount,solution pH of 2~3,adsorption temperature of 40℃,WO₃ concentration of 50~100 g/L,and adsorption time of 240 min,the adsorption rate of D301 resin for tungsten in the isopolytungstate solution exceeds 99.4%.In addition,the desorption behaviors of tungsten loaded resins were also studied.The results show that NaOH serves as the most effective desorption agent for tungsten loaded D301 resin.And under the conditions of a NaOH solution dosage of 20 mL,NaOH concentration of 4 mol/L,desorption temperature of 50℃,and desorption time of 60 min,the tungsten desorption rate reaches 97.94%.