Environmentally Friendly Separation and Recovery Process of Tungsten and Cobalt from Tungsten Carbide Tool Waste
| Autor: | Masakazu Niinae, Takashi Furuyama, Junji Shibata, Norihiro Murayama |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Materials science
Inorganic chemistry Metals and Alloys chemistry.chemical_element Tungsten equipment and supplies Condensed Matter Physics Alkali metal Environmentally friendly chemistry.chemical_compound chemistry Mechanics of Materials Tungsten carbide Reagent Materials Chemistry Leaching (metallurgy) Leachate Cobalt |
| Zdroj: | Journal of the Japan Institute of Metals. 75:613-619 |
| ISSN: | 1880-6880 0021-4876 |
| DOI: | 10.2320/jinstmet.75.613 |
| Popis: | In a present process to treat the tungsten carbide tool waste, the wastes are roasted in air and then an alkali leaching is carried out in an autoclave. However, the cost of reagent and energy consumed in this process are expensive. An environmentally friendly process is required to recover rare metals (Co and W) from the wastes. The effect of mechano-chemical (MC) treatment on leaching of rare metals was investigated in this study. The solvent extraction and crystallization-stripping methods were applied to separate and recover tungsten and cobalt in the leached solutions. The MC treatment for the rare metal leaching is effective to dissolve rare metals from the wastes due to the change in crystalline structure of WC and oxidation of WC with KMnO4. Cobalt ions are extracted with D2EHPA by a cation exchange reaction. Tungsten in the leachate can be extracted by TOA(tri-octyl amine) as an extractant, because tungsten species exist as a form of anionic species in acidic solution. The rare metals in organic phase are recovered as insoluble salts such as oxalates and ammonium salts in the crystallization-stripping process. |
| Databáze: | OpenAIRE |
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