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Metals 2017, 7(7), 230; doi:10.3390/met7070230

A New Recycling Process for Tungsten Carbide Soft Scrap That Employs a Mechanochemical Reaction with Sodium Hydroxide

Department of Energy & Resources Engineering, Kangwon National University, Chuncheon 24341, Korea
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Received: 2 June 2017 / Revised: 17 June 2017 / Accepted: 19 June 2017 / Published: 22 June 2017
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Abstract

WC soft scrap, including Co used as a binder, thermally oxidized at 600 °C, was subjected to grinding with NaOH in a mechanochemical reaction, followed by water leaching to establish an effective recycling process. Na2WO4 was synthesized through a mechanochemical (MC) reaction with oxidized scrap, and Na2CO3 was formed when the mixing ratio of NaOH increased. These as-synthesized compounds were water-soluble. When the weight ratio of soft scrap to NaOH was 1:0.5, 99.2% W was extracted by water leaching, while the extraction yield of Co was limited to 3.57% under the same conditions. View Full-Text
Keywords: WC soft scrap; thermal oxidation; mechanochemical reaction; sodium hydroxide; water leaching WC soft scrap; thermal oxidation; mechanochemical reaction; sodium hydroxide; water leaching
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Lee, J.; Kim, S.; Kim, B. A New Recycling Process for Tungsten Carbide Soft Scrap That Employs a Mechanochemical Reaction with Sodium Hydroxide. Metals 2017, 7, 230.

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