Vanadium adsorption from sodium tungstate solution and its adsorption characteristics using hydrous ferric oxide

被引：0
|
作者：
Xiao L. [1 ]
Chen X. [1 ]
Liu X. [1 ]
Zhao Z. [1 ]
机构：
[1] School of Metallurgy and Environment, Central South University, Changsha
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2022年 / 53卷 / 06期
基金：
中国国家自然科学基金;
关键词：
adsorption; hydrous ferric oxide; tungsten; vanadium;
D O I：
10.11817/j.issn.1672-7207.2022.06.002
中图分类号：
学科分类号：
摘要：
The adsorption characteristics of hydrous ferric oxide were used to study the vanadium removal in sodium tungstate solution. The model was used to quantify the adsorption characteristics of vanadium on hydrous ferric oxide at different pH, surface loadings and ionic strengths. The results show that when the vanadium initial mass concentration is 24 mg/L and W initial mass concentrations are 50, 98, 213 and 466 mg/L, the vanadium adsorption maximum appears at pH of 2.0 to 10.0 and the tungsten adsorption maximum appears at pH of 2.0 to 8.2, 2.0 to 7.8, 2.0 to 7.0, and 1.7 to 2.0 respectively. The adsorption is more effective when hydrous ferric oxide is generated directly in the sodium tungstate solution with the mass ratio of tungsten to vanadium of 1 000. When the addition amount of hydrous ferric oxide is increased, the vanadium removal ratio is higher while the tungsten loss ratio is lower. Under the conditions that the amount of substance of hydrous ferric oxide is 40 times of vanadium, pH is 9.8-10.8 and reaction time is 1 h, the vanadium removal ratio is higher than 99% while the tungsten loss ratio maintains 1.85%-4.42%. The results of scale-up experiment are that the Fe mass fractions in ammonium paratungstate with crystallization ratios of 96% and 100% are 6×10-6 and 9×10-6 respectively, which meet the Fe content standard of 0-level ammonium paratungstate. Ionic strength has very minor or no impact on the adsorption of vanadium. Speciation-based model can simulate the adsorption of vanadium on hydrous ferric oxide in a broad pH range and surface loading conditions. Three surface acid sites of hydrous ferric oxide are identified and their acidity constants of acid sites are 3.50, 7.54 and 11.02 respectively. © 2022 Central South University of Technology. All rights reserved.
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页码：1998 / 2006
页数：8
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