Qin Zhifeng, Jin Xi, Yang Zhen, Xin Yuntao, Liu Weizao
State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Pangang Group Researh Institute Co., Ltd., Panzhihua 617000, China.
Department of Advanced Functional Materials, Chengdu Institute of Advanced Metallic Material Technology and Industry Co., Ltd., Chengdu 610399, China.
Materials (Basel). 2024 Aug 20;17(16):4109. doi: 10.3390/ma17164109.
The effective recovery of gallium from wastewater discharge in the Bayer process is promising for the long-term development of gallium resources. The adsorption and desorption behavior of gallium (Ga), vanadium (V), and aluminum (Al) ions on a strong acidic styrene cation exchange resin (JK resin) from a simulated Bayer solution was systematically investigated by static experiments. The results showed that the optimum conditions for separating Ga from V and Al were at low temperatures and short contact times, with 78.30%, 15.16%, and 6.63% of the adsorption efficiency at 25 °C and 60 min, respectively, for Ga, V, and Al. The adsorption kinetics of Ga conformed to the pseudo-second order model, and the static saturation adsorption capacity was 18.25 mg/g. The Langmuir model fitted the adsorption isotherm of gallium well, and the maximum adsorption capacity was 1.11 mg/g at 25 °C. FT-IR spectroscopy and XPS showed that the mechanism of the Ga adsorption was only related to the interaction of the oxygen atoms of the amide oxime group (C=NOH). The separation of Ga, V, and Al can be achieved by desorbing 98% of Al with low concentrations of ammonia and 90% of Ga with low concentrations of hydrochloric acid. The results indicate that JK resin is an efficient adsorbent for separating gallium and vanadium in alkaline solutions.
从拜耳法废水排放中有效回收镓对镓资源的长期发展具有重要意义。通过静态实验系统研究了镓（Ga）、钒（V）和铝（Al）离子在强酸性苯乙烯阳离子交换树脂（JK树脂）上从模拟拜耳溶液中的吸附和解吸行为。结果表明，从V和Al中分离Ga的最佳条件是低温和短接触时间，在25℃和60分钟时，Ga、V和Al的吸附效率分别为78.30%、15.16%和6.63%。Ga的吸附动力学符合准二级模型，静态饱和吸附容量为18.25mg/g。Langmuir模型很好地拟合了镓的吸附等温线，25℃时最大吸附容量为1.11mg/g。傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）表明，Ga的吸附机理仅与偕胺肟基（C=NOH）的氧原子相互作用有关。通过用低浓度氨水解吸98%的Al和用低浓度盐酸解吸90%的Ga，可以实现Ga、V和Al的分离。结果表明，JK树脂是一种在碱性溶液中分离镓和钒的高效吸附剂。
