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With the growing production of scrap cemented carbides, efficient recyclingRecycling becomes essential to alleviate the mounting strain on tungstenTungsten resources. In this study, a scrap WC-8Co cemented carbide was subjected to microwave roastingMicrowave roasting at 700 °C for various durations to obtain oxidized carbide which underwent alkaline leachingAlkaline leaching under microwave irradiationMicrowave irradiation for tungstenTungsten and cobalt separation. The effects of roasting time on the phase composition and microstructure were investigated by chemical titration, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results revealed that the WO3 and CoWO4 contents steadily rose with increasing roasting time, reaching full oxidationOxidation at 60 min with an efficiency of 99.15%. Applying microwave to alkaline leachingLeaching in 2 mol L–1 NaOH solution at 120 °C for 90 min achieved the leachingLeaching percentage of 99.10%. These findings proved a viable and environmentally friendly approach for recovering and repurposing scrap cemented carbide and other tungstenTungsten-containing industrial waste.

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Efficient Separation of Tungsten and Cobalt from Scrap WC-8Co Cemented Carbides by Microwave Roasting and Alkaline Leaching

  • 会议论文

  • 发表日期：

    2026年

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  • Tong Zhang,
  • Zhiwei Peng,
  • Hao Jiang,
  • Zexi Gong,
  • Xinran Li,
  • Anan Duan

摘要

With the growing production of scrap cemented carbides, efficient recyclingRecycling becomes essential to alleviate the mounting strain on tungstenTungsten resources. In this study, a scrap WC-8Co cemented carbide was subjected to microwave roastingMicrowave roasting at 700 °C for various durations to obtain oxidized carbide which underwent alkaline leachingAlkaline leaching under microwave irradiationMicrowave irradiation for tungstenTungsten and cobalt separation. The effects of roasting time on the phase composition and microstructure were investigated by chemical titration, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results revealed that the WO3 and CoWO4 contents steadily rose with increasing roasting time, reaching full oxidationOxidation at 60 min with an efficiency of 99.15%. Applying microwave to alkaline leachingLeaching in 2 mol L–1 NaOH solution at 120 °C for 90 min achieved the leachingLeaching percentage of 99.10%. These findings proved a viable and environmentally friendly approach for recovering and repurposing scrap cemented carbide and other tungstenTungsten-containing industrial waste.