Improving the washing and desorption of tungsten-adsorbed weak base resin
| Autor: | Zhaoxi Zhang, Yi Xintao, Jiaxun Liu, Haipeng Pu, Ping Chen, Guangsheng Huo |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Ammonium paratungstate
Inorganic chemistry 0211 other engineering and technologies Metals and Alloys chemistry.chemical_element 02 engineering and technology Tungsten Industrial and Manufacturing Engineering law.invention chemistry.chemical_compound Adsorption 020401 chemical engineering chemistry law Desorption Materials Chemistry 0204 chemical engineering Crystallization Aeration Ion-exchange resin Weak base 021102 mining & metallurgy |
| Zdroj: | Hydrometallurgy. 192:105258 |
| ISSN: | 0304-386X |
| DOI: | 10.1016/j.hydromet.2020.105258 |
| Popis: | The adsorption of tungsten by a macroporous weak base resin had been widely studied. However, due to the problem of the crystallization of ammonium paratungstate (APT) during the desorption process, there have been few detailed reports on subsequent steps after resin adsorption. The authors found that APT could be dissolved in ammonia in a closed container at 60 °C while achieving a high resin desorption rate, thus solving practical production problems. On this basis, the washing and desorption behavior of the high capacity ion exchange resin D314 was investigated. The lower sodium ion concentration after aeration washing indicated that the aeration washing could obtain a better washing result than the ordinary shaker shaking washing. The longer the washing time and the greater the number of washing times, the better the washing effect. Under the condition of a liquid-solid volume ratio of 1.25:1 and ammonia eluent of 150 g/L, the single desorption rate of saturated resin for 6 h could reach approximately 90% at 60 °C. A desorption rate of >99% could be achieved by multiple desorption. The industrial processes were designed to achieve the normal operation of resin desorption and the washing solution circulation. Backscattering SEM and EDS were applied to study the distributions of sodium and tungsten before and after the saturated resin treatment. |
| Databáze: | OpenAIRE |
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