Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6659056 | Hydrometallurgy | 2018 | 9 Pages |
Abstract
The Bayer red mud (BRM), generally containing 0.002 wt%-0.008 wt% of gallium (Ga), is an overlooked resource of Ga. In this work, an efficient method, called acidic-leaching-ion-exchange process (ALIEP), was developed to extract Ga from BRM. The ALIEP method involved three main steps: the BRM sample was firstly dissolved by mineral acid and the obtained leaching solution was further purified to remove the Fe3 +. Consequently, the purified solution, pre-concentrated by re-circulation process, was efficiently treated by ion-exchange process for the Ga recovery. The main influencing factors of the acidic-leaching process were systematically investigated. The optimal Ga leaching conditions were determined as HCl 159 g/L, liquid-to-solid ratio of 8 mL/g, 55 °C, and 5 h, attaining Ga leaching rate of 94.77% and the corresponding Ga3 + concentration of 3.91 mg/L in leachate. A nearly complete iron removal from the leachate was achieved by employing LSD-396 resin under conditions of 45 ± 2 °C, resin dosage of 0.6 g/mL and 2 h. Subsequently, the recovery efficiency of Ga from re-circulation leaching solution using the ion-exchange technology was evaluated. The results indicated that an adsorption rate of 59.84% and desorption rate of 95.32% for Ga were obtained. The concentrated solution contained 97.54 mg/L of Ga, which was enriched 24.95 and 4.75 times compared to the initial leaching solution of 3.91 mg/L and re-circulation solution of 20.52 mg/L, respectively.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Fanghai Lu, Tangfu Xiao, Jian Lin, Anjing Li, Qiong Long, Fang Huang, Lihua Xiao, Xiang Li, Jiawei Wang, Qingxiang Xiao, Haiyan Chen,