Fundamental studies on arsenic removal from copper concentrate by heat treatment

Shunta Shibuya, Chiharu Tokoro, Takahiko Okura

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The arsenic content of copper ore for smelting is increasing in recent years. But high arsenic-containing copper ore or concentrate has disadvantage environmentally and economically because arsenic is harmful and should be treated decently in metallurgical process. In this paper, the fundamental experiment for the elimination of arsenic from copper concentrate by volatilization process as sulfide using heat treatment is discussed. A copper concentrate sample was used in this study. The sample was heat-dried for 24 hours, ground under 150 urn, and provided following analysis and experiments. The mineral composition was analyzed by XRD analysis, resulted in Chalcopyrite (CuFeS2) and Pyrite (FeS2). The semiquantitative analysis was performed by XRF, resulted in 0.2 wt% for arsenic, 33.4 wt% for copper, 25.1 wt% for sulfur, 19.1 wt% for iron, 9.9 wt% for oxgen, 4.9 wt% for silicon, and 3.0 wt% for aluminum. For removing arsenic, the sample was heated for 10 to 180 minutes to the temperature range of 673 K to 1173 K in silica furnance tube in inert atmosphere (Ar gas). The residue was dissolved in aqua regia, analyzed by ICP-AES in order to determine the quantity of residual arsenic. XAFS (X-ray adsorption fine structure) analysis was also conducted to find the chemical form of copper and arsenic in the ore and arsenic sulfide in the dust. The decomposition of the sample and volatilization of arsenic were observed above 773 K. A sharp decrease of residual arsenic in the sample was observed around 873 to 923 K and almost all arsenic was removed by volatilization from the sample over 973 K. Residual arsenic content in the sample was 0.019 wt% at 973 K and 0.004 wt% at 1173 K. XAFS analysis revealed that the main chemical form of arsenic in the dust was combintation of arsenic sulfide (AS2S3 and AS4S4).

    Original languageEnglish
    Title of host publicationEuropean Metallurgical Conference, EMC 2013
    Pages111-122
    Number of pages12
    Publication statusPublished - 2013
    Event7th European Metallurgical Conference, EMC 2013 - Weimar
    Duration: 2013 Jun 232013 Jun 26

    Other

    Other7th European Metallurgical Conference, EMC 2013
    CityWeimar
    Period13/6/2313/6/26

    Fingerprint

    Arsenic
    Copper
    Heat treatment
    Vaporization
    Ores
    Dust
    Adsorption
    X rays
    Smelting
    Sulfides
    Silicon
    Aluminum
    Sulfur
    Pyrites
    Silicon Dioxide
    Minerals
    Iron
    Gases
    Experiments

    Keywords

    • Arsenic
    • Copper smelting
    • Heat treatment
    • XAFS

    ASJC Scopus subject areas

    • Metals and Alloys

    Cite this

    Shibuya, S., Tokoro, C., & Okura, T. (2013). Fundamental studies on arsenic removal from copper concentrate by heat treatment. In European Metallurgical Conference, EMC 2013 (pp. 111-122)

    Fundamental studies on arsenic removal from copper concentrate by heat treatment. / Shibuya, Shunta; Tokoro, Chiharu; Okura, Takahiko.

    European Metallurgical Conference, EMC 2013. 2013. p. 111-122.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Shibuya, S, Tokoro, C & Okura, T 2013, Fundamental studies on arsenic removal from copper concentrate by heat treatment. in European Metallurgical Conference, EMC 2013. pp. 111-122, 7th European Metallurgical Conference, EMC 2013, Weimar, 13/6/23.
    Shibuya S, Tokoro C, Okura T. Fundamental studies on arsenic removal from copper concentrate by heat treatment. In European Metallurgical Conference, EMC 2013. 2013. p. 111-122
    Shibuya, Shunta ; Tokoro, Chiharu ; Okura, Takahiko. / Fundamental studies on arsenic removal from copper concentrate by heat treatment. European Metallurgical Conference, EMC 2013. 2013. pp. 111-122
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    abstract = "The arsenic content of copper ore for smelting is increasing in recent years. But high arsenic-containing copper ore or concentrate has disadvantage environmentally and economically because arsenic is harmful and should be treated decently in metallurgical process. In this paper, the fundamental experiment for the elimination of arsenic from copper concentrate by volatilization process as sulfide using heat treatment is discussed. A copper concentrate sample was used in this study. The sample was heat-dried for 24 hours, ground under 150 urn, and provided following analysis and experiments. The mineral composition was analyzed by XRD analysis, resulted in Chalcopyrite (CuFeS2) and Pyrite (FeS2). The semiquantitative analysis was performed by XRF, resulted in 0.2 wt{\%} for arsenic, 33.4 wt{\%} for copper, 25.1 wt{\%} for sulfur, 19.1 wt{\%} for iron, 9.9 wt{\%} for oxgen, 4.9 wt{\%} for silicon, and 3.0 wt{\%} for aluminum. For removing arsenic, the sample was heated for 10 to 180 minutes to the temperature range of 673 K to 1173 K in silica furnance tube in inert atmosphere (Ar gas). The residue was dissolved in aqua regia, analyzed by ICP-AES in order to determine the quantity of residual arsenic. XAFS (X-ray adsorption fine structure) analysis was also conducted to find the chemical form of copper and arsenic in the ore and arsenic sulfide in the dust. The decomposition of the sample and volatilization of arsenic were observed above 773 K. A sharp decrease of residual arsenic in the sample was observed around 873 to 923 K and almost all arsenic was removed by volatilization from the sample over 973 K. Residual arsenic content in the sample was 0.019 wt{\%} at 973 K and 0.004 wt{\%} at 1173 K. XAFS analysis revealed that the main chemical form of arsenic in the dust was combintation of arsenic sulfide (AS2S3 and AS4S4).",
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