A sulfidation Process for Recovering Ni from an Acidic Spent Catalyst, and the Chemical Characterization of the Sulfide Precipitates

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  • Iwai Hisanori
    Sustainable Energy & Environmental Society Open Innovation Research Organization, Waseda University
  • Ishii Shun
    Department of Resources and Environmental Engineering, Faculty of Science and Engineering, Waseda University
  • Oyama Keishi
    Department of Resources and Environmental Engineering, Faculty of Science and Engineering, Waseda University
  • Fuchida Shigeshi
    Department of Resources and Environmental Engineering, Faculty of Science and Engineering, Waseda University Department of Marine Resource and Energy, Tokyo University of Marine Science and Technology
  • Yokota Naoki
    Next-Generation Technology Design and Creation, TAKAHATA PRECISION Co., Ltd.
  • Takahashi Yuko
    Next-Generation Technology Design and Creation, TAKAHATA PRECISION Co., Ltd.
  • Tokoro Chiharu
    Department of Resources and Environmental Engineering, Faculty of Science and Engineering, Waseda University Department of System Innovation, Faculty of Engineering, The University of Tokyo

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Other Title
  • 酸性触媒廃液からの硫化物法によるNi回収プロセスと硫化沈殿物の化学特性
  • サンセイ ショクバイ ハイエキ カラ ノ リュウカブツホウ ニ ヨル Ni カイシュウ プロセス ト リュウカ チンデンブツ ノ カガク トクセイ

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Abstract

<p>This study proposed a sulfidation process as a practical approach for recovering Ni from the acidic spent catalyst. Ni can be obtained by a precipitate as NiS particle by adding Na2S in the acidic media (pH 3). In the presence of chelate agents, 2,2’-bipyridine (bpy), the percentage value of Ni recovery by a hydroxylation process was only 46%, and the recovery value improved to 88% by the sulfidation. XAFS analyses for the precipitates showed that more than 60% of NiS from chelate-free media was oxidized to NiSO4; while about 80% of Ni remained as NiS when it was generated in the bpy-containing condition. However, Ni was also bound with bpy in the NiS particle, revealed by FT-IR spectra. From these results, , in the spent catalyst, Ni would be precipitated as an S-Ni-bpy cluster by the sulfidation process.</p>

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