Separation and recovery of arsenic from As, Cu, and Zn rich leaching liquor using a reduction-crystallization approach
| Autor: | Erjun Zhang, Changhong Peng, Wei Chen, Dewen He, Kanggen Zhou, Xuekai Zhang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
inorganic chemicals
General Chemical Engineering 0211 other engineering and technologies chemistry.chemical_element Sulfuric acid 02 engineering and technology General Chemistry 010501 environmental sciences complex mixtures 01 natural sciences law.invention Copper dust chemistry.chemical_compound chemistry law Leaching (metallurgy) Crystallization Arsenic 021102 mining & metallurgy 0105 earth and related environmental sciences Nuclear chemistry |
| Zdroj: | RSC advances. 11(36) |
| ISSN: | 2046-2069 |
| Popis: | As, Cu, and Zn rich leaching liquor is generated in the leaching process of copper dust, which contains various metals with high recovery value. Herein, an approach for the direct separation and recovery of arsenic from As, Cu, and Zn rich leaching liquor was proposed. The approach includes two steps, namely SO2 reduction and arsenic crystallization. The factors affecting the reduction of As(V) to As(III) were investigated, including the pH, SO2 dosage, and reduction temperature. In the crystallization stage, the impacts of sulfuric acid consumption and temperature on the crystallization of arsenic (As2O3) were studied. The results show that the optimal H+ concentration, temperature, and SO2 input for the arsenic reduction were 3.95 mol L−1, 45 °C, and 1.14 L g−1 As(V), respectively. While the optimal temperature and sulfuric acid dosage in As recovery process were 5 °C and 0.1 L L−1 leaching liquor, respectively. Under these conditions, the As2O3 recovery percentage reached 96.53%, and the losses of Cu and Zn were only 3.12% and 0.75%, respectively. The precipitate contained 96.72% of As2O3, 0.83% of Cu, and 0.13% Zn. Compared with the traditional technologies, this new method can improve the recovery efficiency of As2O3 and reduce the loss percentage of other valuable metals (Cu and Zn). |
| Databáze: | OpenAIRE |
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