Coordination leaching of tungsten from scheelite concentrate with phosphorus in nitric acid
Coordination leaching of tungsten from scheelite concentrate with phosphorus in nitric acid作者机构：School of Metallurgy and Environment Central South University Changsha 410083 China Key Laboratory of Hunan Province for Metallurgy and Material Processing of Rare Metals Changsha 410083 China
出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)
年 卷 期：2016年第23卷第6期
页 面：1312-1317页
核心收录：
学科分类：081902[工学-矿物加工工程] 0819[工学-矿业工程] 08[工学]
基 金：Project(51334008) supported by the National Natural Science Foundation of China
主 题：scheelite nitric acid phosphoric acid coordination leaching
摘 要：A hydrometallurgical process for tungsten extraction and recovery from scheelite is *** technology includes leaching scheelite using phosphoric acid as chelating agent in nitric acid solutions,extracting tungsten by solvent extraction and reusing leaching *** the leaching process,affecting factors,such as temperature,leaching time,nitric acid and dosage of phosphoric acid,were examined on recovery of *** show that more than 97%of tungsten could be extracted under conditions of leaching temperature of 80-90°C,HNO3 concentration of 3.0-4.0 mol/L,liquild-to-soild ratio of 10:1,H3PO4 dosage of 3 stoichiometric ratio and leaching time of 3 *** extraction was then employed for the W recovery from the leachate with a organic system of 40%(v/v)N235,30%(v/v)TBP,and 30%sulfonated *** 99.93%of W was extracted and ammonium tungstate solution containing 193 g/L W was obtained with a stripping rate of 98.10%under the optimized conditions.
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