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| Study on ultrasonic enhanced sulfuric acid washing of tannin germanium residue |
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Received:April 18, 2024
Revised:April 28, 2024
Accepted:May 06, 2024
Published Online:March 24, 2025
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| DOI： |
| KeyWord:ultrasound; tannin germanium slag; sulfuric acid washing; germanium concentrate; removal rate |
| Author | Institution |
| Zhanqing Lu |
Faculty of Metallurgy and Energy Engineering Kunming University of Science and Technology, Yunnan Chihong Zn Ge Co,Ltd |
| Yingjie Xu |
Faculty of Metallurgy and Energy Engineering Kunming University of Science and Technology |
| Qifei Pei |
Yunnan Chihong Zn & Ge Co., Ltd |
| Chen liang |
Faculty of Metallurgy and Energy Engineering Kunming University of Science and Technology |
| Hongying Xia |
Faculty of Metallurgy and Energy Engineering Kunming University of Science and Technology |
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| Abstract: |
| Due to the special properties of germanium, it has been classified as a strategic resource by many countries and has an irreplaceable role in many fields. However, during the leaching process of zinc oxide dust, impurity metals and germanium will enter the solution together, and complexation reaction occurs with tannic acid, resulting in low grade and high impurity content of germanium concentrate obtained after calcination, which is very unfavorable for the subsequent chlorination distillation process. Therefore, before the calcination of tannin residue, the removal of impurity metals is of great significance for the resource utilization of germanium. The solid slag after germanium precipitation by tannic acid was used as raw material, and sulfuric acid solution was used as detergent. The main metals zinc and iron were removed by introducing ultrasonic wave to achieve high enrichment of germanium. The effects of solid-liquid ratio, sulfuric acid concentration, pickling time, pickling temperature and ultrasonic power on the removal rate of zinc and germanium in the pickling process were studied by single factor method. The results showed that under the conditions of H2SO4 concentration of 0.3 M, solid-liquid ratio of 300 g/L, pickling time of 40 min, pickling temperature of 50 °C, stirring speed of 300 r/min and ultrasonic power of 300 W, the removal rates of zinc and iron were 86.74% and 85.68%, respectively. The calcination test of tannin germanium after washing and impurity removal showed that the grade of germanium concentrate produced by ultrasonic enhanced pickling increased by about 15% compared with conventional pickling. In addition, the phase and surface morphology of raw materials, washing slag and calcined slag were analyzed by ICP, XRD, XPS, SEM and other characterization methods, and the pickling mechanism was explored, in order to provide reference for the precipitation of germanium by tannin and the preparation of germanium concentrate by calcination. |
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