The Effect of Underwater Explosion on the Kinetics of Alkaline Leaching of Roasted Tungsten Carbide Scraps for Recycling

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  • BAIK Seung Woo
    Researcher of Satellite Venture Business Laboratory, Akita University
  • SHIBAYAMA Atsushi
    Department of Material-process Engineering & Applied Chemistry for Environment, Faculty of Engineering and Resource Science, Akita University
  • MURATA Kenji
    NOF Corporation
  • FUJITA Toyohisa
    RACE, Department of Geosystem Engineering, Graduate School of Engineering, The University of Tokyo

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Wasted tungsten scraps are important resources for recycling, however, the mechanical recycle process of tungsten has a difficulty for recycling due to its mechanical strength. Underwater explosion fracturing technique was designed for solving this problem. The kinetics for alkaline leaching of roasted tungsten alloy scraps with different size distribution prepared by two ways of crushing technique has been investigated to evaluate the effect of the underwater explosion-crushing. The merit of this technique for fracturing of waste tungsten alloy scraps can be understood by estimating of those leaching tendencies. The present work aims at the evaluation of the explosion-crushing method for efficiency of alkaline leaching from a kinetic point of view. Alkaline leaching was carried out with 10% NaOH solution in the range of 293-353K at various times. The leaching of roasted tungsten carbide scraps by NaOH was strongly dependent on temperature and leaching time, and underwater explosion accelerated the leaching ratio. The leaching mechanism was turned out to reaction controlled, and activation energy of alkaline leaching was 60-64 kJ/mol.

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