Recovery of Ni from Wasted Etching Solution of Lead Frame.

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  • リードフレームエッチング廃液からのＮｉの回収
  • リード フレーム エッチング ハイエキ カラ ノ Ni ノ カイシュウ

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Description

Fe-Ni alloy, namely 42 alloy, has made broad use for lead frame in electronic industries. Usually acidic concentrated ferric chloride solutions are used as an etching solution while lead frame is being etched. In an etching process as dissolution of the material goes on, the etching efficiency deteriorates owing that Ni or Fe ions accumulate in the etching solution. In order to keep the etching efficiency a certain level, a fresh etching solution is replaced with a part of the wasted solution to maintain the uniformity of the solution composition. The wasted etching solution contains concentrated Ni and Fe ions. At present, the wasted etching solutions are treated by a precipitation method and then precipitated Ni is used for a material to make stainless steel. It is known that EHO(2-ethylhexanal oxime) is the extractant which has a characteristic to extract Ni prior to Fe. However, no study is performed concerning the precedent extraction of Ni from hydrochloric acid solution.In this study, the recovery of concentrated Ni from used etching solutions with a solvent extraction method was examined and we tried to establish the process to recycle the etching solutions.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 114 (1), 57-61, 1998

    The Mining and Materials Processing Institute of Japan

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