Recycling Process for Tantalum from Capacitor Scraps and Chlorination by Utilizing Chloride Wastes

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  • MINETA Kunio
    Graduate school of Engineering, The University of Tokyo (Present at Mazda Motor Co., Ltd.)
  • OKABE Toru H.
    Institute of Industrial Science, The University of Tokyo

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Other Title
  • コンデンサスクラップからのタンタルの分離回収法と塩化物廃棄物を利用する塩化法
  • コンデンサスクラップ カラ ノ タンタル ノ ブンリ カイシュウホウ ト エンカブツ ハイキブツ オ リヨウ スル エンカホウ

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A fundamental study was carried out on the process for recycling tantalum from off-spec capacitor scraps that are generated during manufacturing process in a large mass. By oxidizing the capacitor scraps in air at 1150K, followed by physical and chemical treatments (e.g., magnetic separation, sieving, and acid leaching), tantalum oxide (Ta2O5) powder was recovered from the scrap with a yield of 90% or more. Tantalum powder with 99 mass% purity was obtained by the magnesiothermic reduction of the obtained tantalum oxide powder, and silicon was found to be major impurity in the tantalum. A new purification process for tantalum, utilizing chloride wastes generated from the titanium production process, was also investigated and thermodynamically analyzed from various aspects. Furthermore, it was experimentally proved that metallic tantalum can be chlorinated by iron chloride (FeClx), which is a major chloride compound in the chloride wastes from titanium smelting process, and that iron-free tantalum chloride (TaCl5) can be produced. The results obtained in this study demonstrate not only the effective purification process and recovery of tantalum but also the possibility of recovering chlorine from the wastes generated during the titanium smelting. The investigated process of recycling chloride wastes may be useful and applied to other metals, because it has the potential for reducing the chlorine loss caused by chloride waste generation in chloride metallurgy.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 121 (7), 284-290, 2005

    The Mining and Materials Processing Institute of Japan

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