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首页> 外文期刊>Journal of African Earth Sciences >Numidian clay deposits as raw material for ceramics tile manufacturing
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Numidian clay deposits as raw material for ceramics tile manufacturing

机译：Numidian粘土沉积物作为陶瓷砖生产的原料

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摘要

We investigate the potential use in traditional ceramics of several clays collected in the Numidian Flysch Formation (Upper Oligocene) at Tabarka, and Sejnane; Northern part of Tunisia). The valorisation of these adopts the technique of dry process, which requires a mixture of powdered clay with 7% water. This allows rapid drying of uncooked files. The files are fired at four different temperatures (1000 degrees C, 1050 degrees C, 1100 degrees C and 1150 degrees C) in order to optimize technological parameters such as shrinkage, water absorption and flexural strength. The obtained files show acceptable drying and firing shrinkage (not exceeding 3%), and bending strength (between 13 and 16 N/mm(2)) which are close to the required standards (EN ISO 10545-4, 15N/mm(2) for wall files). The absorption ranges from 10 to 20%, which classifies these products in group BIII according to the international standards (ISO 13006 and EN ISO 10545-3). Variation of shrinkage and water absorption with the firing temperature reveals that optimal range is 1125-1150 degrees C for the Tabarka samples, whereas the Sejnane products might be fired at lower values (similar to 1025 degrees C). The Tabarka fired pieces exhibit strong brightness. These results suggest that these latter clays could be used for white products such as sanitary ware formulations while those from Sejnane ones are more appropriated for colored (red) applications. The X-ray diffraction on the fired files powders shows the formation of quartz which is initially present in the crude clays, and mullite that is present at all firing temperatures. Moreover, the presence of mullite due to the richness of Al2O3 in Tabarka clays could support their refractory properties.
机译：我们调查了在塔巴卡和塞纳内的Numidian Flysch组（上渐新世）中收集的几种粘土在传统陶瓷中的潜在用途。突尼斯北部）。这些产品的定价采用干法技术，该技术需要粉状粘土与7％水的混合物。这样可以快速干燥未煮过的文件。这些锉刀在四个不同的温度（1000摄氏度，1050摄氏度，1100摄氏度和1150摄氏度）下烧制，以优化工艺参数，例如收缩率，吸水率和抗弯强度。获得的文件显示出可接受的干燥和烧制收缩率（不超过3％）以及弯曲强度（13和16 N / mm（2）之间），均接近要求的标准（EN ISO 10545-4，15N / mm（2） ）（用于墙文件）。吸收率为10％到20％，根据国际标准（ISO 13006和EN ISO 10545-3）将这些产品归为BIII组。收缩温度和吸水率随焙烧温度的变化表明，塔巴卡样品的最佳范围是1125-1150摄氏度，而赛扬产品可能以较低的值（类似于1025摄氏度）焙烧。塔巴卡烧制的碎片显示出很强的亮度。这些结果表明，后一种粘土可用于白色产品，例如卫生洁具配方，而来自Sejnane的粘土更适合于有色（红色）应用。焙烧过的锉粉上的X射线衍射表明形成了最初存在于粗粘土中的石英，并形成了在所有焙烧温度下均存在的莫来石。而且，由于塔巴卡粘土中Al2O3的丰富性，莫来石的存在可以支持其耐火性能。

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  • 来源
    《Journal of African Earth Sciences》 |2020年第4期|103775.1-103775.11|共11页
  • 作者

  • 作者单位

    CERTE Georessources Lab Soliman 2738020 Tunisia;

    CERTE Nat Water Treatment Lab Soliman 2738020 Tunisia;

    Univ Carthage Higher Inst Environm Sci & Technol Borj Cedria BP 1003 Hammam Lif 2050 Tunisia;

    Natl Off Mines 24 St Energy 2035 Charguia Tunis BP 215 Tunis 10801 Tunisia;

    Univ Aveiro Mat & Ceram Engn Dept P-3810193 Aveiro Portugal|Univ Aveiro CICECO P-3810193 Aveiro Portugal;

    Univ Namur ILEE Dept Geol 61 Rue Bruxelles B-5000 Namur Belgium;

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  • 正文语种 eng
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  • 关键词

    Clays; Tabarka; Sejnane; Ceramic tiles; Technological parameters; Tunisia;

    机译：黏土;塔巴卡塞纳内;瓷砖;技术参数;突尼斯;

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