Development of Arsenic and/or Antimony Removal Process from Tennantite/Tetrahedrite via Alkaline Leaching and Precipitation Process

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  • アルカリ浸出と沈殿処理による四面銅鉱からのヒ素およびアンチモン除去プロセスの開発
  • アルカリ シンシュツ ト チンデン ショリ ニ ヨル シメン ドウコウ カラ ノ ヒソ オヨビ アンチモン ジョキョ プロセス ノ カイハツ

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Abstract

A copper ore containing mixture of tetrahedrite (Cu12Sb4S13) and tennantite (Cu12As4S13) as main copper bearing minerals were used in the current study to investigate antimony (Sb) and arsenic (As) leaching into the NaHS–NaOH solution and precipitation behaviors of these metals from the solution. In leaching test, effect of temperature, NaHS concentration, pulp density and leaching time were investigated to evaluate leaching of Sb and As impurities into the solution and recovering a clean Cu ore containing Sb and As less than 0.5 mass%. At leaching tests, temperatures ranging from 90–95ºC and NaHS concentration from 600 g/L (10.8 M), both Sb and As contents in the solid were reduced to <0.5 mass%. A two-step alkaline leaching tests were performed at high pulp density up to 1,000 g/L and high dissolution result in the solution was obtained for both Sb and As leaching, respectively. In the precipitation, elemental sulfur with S/(As+Sb) mass ratio of 0.25 was added to leachate contains high amount of As and Sb and kept the temperature at 90ºC for 1-2 hours. The solution prepared cooled quickly up to 30ºC with moderate stirring and maintained the condition for 3-5 hours. As a result, over 90 % of Sb and As were recovered from the leachate, respectively. The recirculation of process filtrates for re-use in tennantite/tetrahedrite leaching continued to give reproducible leaching results.

Journal

  • Journal of MMIJ

    Journal of MMIJ 131 (1), 27-32, 2015

    The Mining and Materials Processing Institute of Japan

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