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首页> 美国卫生研究院文献>Materials >Manufacture of Sustainable Clay Bricks Using Waste from Secondary Aluminum Recycling as Raw Material
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Manufacture of Sustainable Clay Bricks Using Waste from Secondary Aluminum Recycling as Raw Material

机译：以二次铝回收废料为原料生产可持续粘土砖

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The aluminum recycling industry produces aluminum filter dust (AFD), a waste byproduct of the aluminum recycling process composed mainly of aluminum oxide in a percentage between 60–70%, 8% calcium oxide, almost 15% sodium chloride, and between 5–10% potassium chloride. Due to its aluminum content, this waste can be used as a raw material in the manufacture of ceramic bricks, at the same time reducing the environmental impact produced in landfill. In this work, the partial substitution of a clay mixture (40% black, 30% red, and 30% yellow clay) by different proportions of AFD in the range 0–25 wt % for the production of fired clay brick was studied. The raw materials, clays, and waste were characterized by XRF and XRD. The brick specimens were fired at 950 °C and their physical and mechanical properties, such as water absorption, water suction, loss of ignition, linear shrinkage, bulk density, and compressive strength, were analyzed. The more relevant results were obtained with the addition of up to 20 wt % AFD, obtaining bricks with physical properties comparable to pure clay-based bricks used as a reference and better compressive strength and thermal conductivity due to the balance between the melting and pore-forming effects of the waste. These sustainable bricks also comply with the regulations of heavy metals leached to the environment, as indicated by the leaching test.
机译：铝回收行业产生铝过滤器粉尘（AFD），这是铝回收过程中产生的一种副产品，主要由氧化铝组成，其比例在60-70％，8％氧化钙，几乎15％的氯化钠和5-10之间％氯化钾。由于其含铝量，这种废物可用作陶瓷砖的生产原料，同时减少了垃圾填埋场对环境的影响。在这项工作中，研究了用0–25 wt％范围内的不同比例的AFD将粘土混合物（40％黑色，30％红色和30％黄色粘土）部分替代以生产煅烧粘土砖。用XRF和XRD对原料，粘土和废物进行了表征。在950°C的温度下烧制砖试样，并分析其物理和机械性能，例如吸水率，吸水率，失火率，线性收缩率，堆积密度和抗压强度。通过添加高达20 wt％的AFD可获得更相关的结果，获得的砖的物理性能可与用作参考的纯粘土基砖相媲美，并且由于熔融和孔隙率之间的平衡而具有更好的抗压强度和导热性。废物的形成效果。这些可持续性砖还符合浸出到环境中的重金属法规，如浸出测试所示。

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