Quantitation of Chloride in Cupric Oxide Recovered from Copper-Containing Etchant Waste

Matsumura, Takashi; Kobayashi, Takuya; Kobayashi, Atsuki

doi:10.2473/journalofmmij.126.701

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2013

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“…The chloride content of the CuO was evaluated by the AgCl precipitation titration method. 15) In the usual precipitation titration method, CuO containing chloride is dissolved in H 2 SO 4 , and then the dissolved chloride is titrated with AgNO 3 solution, as follows:…”

Section: Chloride Contentmentioning

confidence: 99%

Novel On-Site Cupric Oxide Recovery Process from Waste Containing Copper

Kobayashi

Kano²,

Suzuki³

et al. 2013

Jpn. J. Appl. Phys.

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Although the copper-containing waste from semiconductor or printed circuit board (PCB) manufacturing contains a high concentration of copper, it is usually transported and treated outside of the factories. We studied a novel treatment technology for on-site recycling in the factories. In this technology, cupric oxide with a low-chloride-content was obtained from waste with a high copper concentration, such as cupric chloride etchant waste and cupric sulfate plating waste. In the proposed method, copper-containing waste mixed with H2O2 solution is added to NaOH solution by stepwise addition. In laboratory experiments, we optimized the reaction conditions and obtained low-chloride-content CuO from actual cupric chloride etchant waste and cupric sulfate plating waste. Based on the laboratory experiments, we constructed the first practical plant at a PCB factory and obtained low-chloride-content CuO.

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Section: Chloride Contentmentioning

confidence: 99%