Separation and recovery of Cu and As from copper electrolyte through electrowinning and SO2 reduction
| Autor: | Lang Ke, Ya-jie Zheng, Wen-mi Chen, Ying-lin Peng |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Chemistry
Inorganic chemistry Metals and Alloys Analytical chemistry Limiting current chemistry.chemical_element Electrolyte Geotechnical Engineering and Engineering Geology Condensed Matter Physics Copper Cathode law.invention law Materials Chemistry Crystallization Current density Arsenic Electrowinning |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 23:2166-2173 |
| ISSN: | 1003-6326 |
| DOI: | 10.1016/s1003-6326(13)62713-2 |
| Popis: | Cu and As were separated and recovered from copper electrolyte by multiple stage electrowinning, reduction with SO 2 and evaporative crystallization. Experimental results showed that when the current density was 200 A/m 2 , the electrolyte temperature was 55 °C, the electrolyte circulation rate was about 10 mL/min and the final Cu concentration was higher than 25.88 g/L, the pure copper cathode was recovered. By adjusting the current density to 100 A/m 2 and the electrolyte temperature to 65 °C, the removal rate of As was 18.25% when the Cu concentration decreased from 24.69 g/L to 0.42 g/L. After As(V) in Cu-depleted electrolyte was fully reduced to As(III) by SO 2 , the resultant solution was subjected to evaporative crystallization, then As 2 O 3 was produced, and the recovery rate of As was 59.76%. The cathodic polarization curves demonstrated that both Cu 2+ concentration and As(V) affect the limiting current of Cu 2+ deposition. |
| Databáze: | OpenAIRE |
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