Leaching of metastannic acid from e-waste by-products
| Autor: | Branimir Jovančićević, Jovana Djokić, Milisav Ranitović, Željko Kamberović, Ilija Brčeski, Nataša Gajić |
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| Rok vydání: | 2020 |
| Předmět: |
Inert
Materials science Reducing agent Metallurgy 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Sulfur E-waste Anode slime Anode chemistry Mechanics of Materials Tin Metastannic acid Smelting Leaching 021108 energy Leaching (metallurgy) Waste Management and Disposal 0105 earth and related environmental sciences Electrowinning |
| Zdroj: | Journal of Material Cycles and Waste Management |
| Popis: | Anode slime and tin precipitate as by-products of the electrorefining (ER) of non-standard anodes obtained after experimental smelting of waste electric and electronic equipment (e-waste), in addition to the base and precious metals, contains a significant amount of tin. Due to its presence as inert SnO(2)hydrate (beta metastannic acid) and its dissipation between slime and electrolyte, anode slime processing and metals valorization are difficult. This study aimed to investigate conditions under which efficient leaching of metastannic acid could be achieved to facilitate further metals valorization, especially precious metals. The investigation was performed using the by-products obtained from the ER of the non-standard Cu anodes produced by pyrometallurgical processing of e-waste. After detailed characterization of obtained products, the influence of various process parameters like temperature, acid concentration, leaching time, as well as the influence of reducing agent, sulfur compounds, and SnO(2)hydration rate on leaching efficiency was investigated. It was found that efficiency of 99% can be achieved by leaching the desulfurized tin precipitate sample in 6 M HCl at 90 degrees C for 90 min with the addition of Mg powder. The application of the tin removal process, described in this paper, contributes to efficient material flow management. [GRAPHICS] . |
| Databáze: | OpenAIRE |
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