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    The effect of grinding chemistry on cyanide leaching of gold in the presence of pyrrhotite

    Access Status
    Fulltext not available
    Authors
    Rabieh, Alireza
    Eksteen, J.
    Albijanic, Boris
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Rabieh, A. and Eksteen, J. and Albijanic, B. 2017. The effect of grinding chemistry on cyanide leaching of gold in the presence of pyrrhotite. Hydrometallurgy. 173: pp. 115-124.
    Source Title
    Hydrometallurgy
    DOI
    10.1016/j.hydromet.2017.08.013
    ISSN
    0304-386X
    School
    Dept of Mining Eng & Metallurgical Eng
    URI
    http://hdl.handle.net/20.500.11937/56866
    Collection
    • Curtin Research Publications
    Abstract

    In this paper, the role of grinding media type on cyanide-based gold leaching in the presence of pyrrhotite was investigated. Pyrrhotite commonly occurs in many gold ores together with pyrite and/or arsenopyrite. A synthetic ore was prepared by mixing pyrrhotite with gravity gold concentrate and quartz. Pyrrhotite is of interest to grinding and leaching chemistry because this sulfide mineral is the highest cyanide- and oxygen-consuming iron sulfide and, contrary to pyrite, tends to behave as a reactive anode. The results showed that when the grinding of the ore was performed using the ceramic media, the gold extraction process was up to three times more efficient than that when the forged steel media was used. The reason is that the galvanic interactions between the forged steel media and pyrrhotite resulted in the formation of iron hydroxide; the formed iron hydroxide converted free cyanide to ferrocyanide that cannot dissolve gold (i.e. 75% of free cyanide was converted to ferrocyanide). Additionally, the galvanic interactions also significantly reduce the dissolved oxygen content and thus cyanide gold leaching is more difficult. In contrast, when grinding was performed with the ceramic or high chromium (30%Cr) media, an insignificant amount of free cyanide was decomposed (i.e. 1% of free cyanide was converted to ferrocyanide while 2.5% of that was converted to thiocyanate). For that reason, cyanide gold leaching is very efficient when ceramic or high chromium media was used during the grinding of the ore. It can be expected that the leach behaviour would be different if leaching is preceded by pre-oxidation, as is often done for pyrrhotite bearing ores. In addition, a theoretical model was developed to describe the correlation between the galvanic current and the grinding media oxidation, as measured by using EDTA extraction technique and dissolved sulfur analysis by HPLC during grinding. The electrochemical data were correlated with the amount of the grinding media oxidation during grinding with different media type. A linear relationship between the galvanic current and grinding media oxidation was obtained. It was found that the higher the galvanic current, the higher the amount of iron hydroxide was produced during grinding. Bench scale cyanide leaching can therefore serve as a useful diagnostic to determine the extent of galvanic interactions between media and minerals in grinding mills (similar to bench scale flotation which has also been used as diagnostic tool).

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      © 2017 Elsevier Ltd. Galvanic interactions between different types of grinding media and arsenopyrite and pyrite, during the grinding was quantified and the effect of galvanic interactions on gold cyanide leaching was ...
    • A review of the effects of grinding media and chemical conditions on the flotation of pyrite in refractory gold operations
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      The focus of this thesis was to better understand the influence of grinding media on flotation of gold bearing pyrite and cyanide gold leaching in the presence of sulfide minerals (pyrrhotite, arsenopyrite and pyrite). ...
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