COBALT(II) AND COPPER(II) RECOVERY BY FLUIDIZED-BED HOMOGENEOUS GRANULATION PROCESS USING CARBONATE PRECIPITATION AGENT
| Autor: | Thanachot Udomphan |
|---|---|
| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 This research investigated the feasibility of recovery cobalt and copper from synthetic wastewater by using the homogeneous granulation process in a fluidized-bed reactor operated in a continuous mode under room conditions. Sodium carbonate was used as the precipitant. The studied variables included pH, molar ratio of carbonate to metal, metal concentration, and chloride concentration. The highest granulation and removal efficiencies of 7 mM cobalt wastewater were 94.03% at pH 8.5 and 98.97% at pH 9.0, respectively. For 7 mM copper wastewater, the highest granulation and removal efficiencies were 95.29% at pH 7.0 and greater than 99% at pH 7.0 to 8.5, respectively. Optimum carbonate to metal molar ratio was 2 for all cases. Most cobalt and copper granules had the sizes less than 0.1 mm in diameter. For mixed 10.5 mM cobalt and 10.5 mM copper synthetic wastewater, the optimum conditions were at pH 8.50 and the carbonate to total metal molar ratio of 2 which yielded the maximum granulation and removal efficiencies of 96.03% and 97.84% for cobalt and 97.77% and 99.78% for copper, respectively. Approximately 95% of the granules had the diameters less than 0.1 mm. In the presence of chloride, the granulation and removal efficiencies of metals as well as the granule size decreased significantly. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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