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Dissolution kinetics of gold in moderate aqueous potassium iodide solutions with oxygen under pressure

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Abstract

The kinetics of gold dissolution in iodide solutions with oxygen in an autoclave was investigated. The leaching process was described by a gas-liquid-solid heterogeneous reaction. The effects of stirring speed, temperature, oxygen partial pressure and lixiviant concentrations on the overall leaching rate was investigated. It was found that the dissolution of gold could be represented by a heterogeneous chemical reaction. Under the conditions studied, the apparent activation energy ranged from 34.7 to 54.3 kJ/mol. Experimental findings were in good agreement with the kinetic model proposed.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, South Dakota School of Mines and Technology, Rapid City, SD, USA

    X. Meng (assistant professor and distinguished professor and dean) & K. N. Han (assistant professor and distinguished professor and dean)

Authors
  1. X. Meng
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  2. K. N. Han
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Additional information

SME preprint 96-72, SME Annual Meeting, March 11–14, 1996, Phoenix, AZ.

M&MP paper 96-619. Discussion of this peer-reviewed and apporved paper is invited and must be submitted to SME prior to Aug. 31, 1997.

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Meng, X., Han, K.N. Dissolution kinetics of gold in moderate aqueous potassium iodide solutions with oxygen under pressure. Mining, Metallurgy & Exploration 14, 1–9 (1997). https://doi.org/10.1007/BF03402752

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  • DOI: https://doi.org/10.1007/BF03402752

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