Abstract

Once their life-span is finished, fluorescent lamps are usually processed in vacuum crushers because of their Hg content. This procedure generates glass waste and spent phosphor powders, among other residual materials. Due to their composition, glass waste and phosphor powders could be incorporated as secondary raw materials in the formulation of clay-based construction materials for non-structural applications. In this work, this incorporation was studied, focusing on the analysis of the formation of defects in the final product and its impact on the statistical variability of some physical and mechanical properties of the clay bodies, such as: density, linear shrinkage, water absorption, and compressive strength. It was found that a combination of factors, i.e. the presence of Pb and calcium carbonate in the waste glass, concurred to induce the formation of two kind of defects in the fired ceramics: internal blowholes and external glassy exudations. Despite the presence of these defects, the physical and mechanical properties of the test bricks produced were not statistically different from the standard formulation used as control. The implications of these findings on the possible application of spent fluorescent lamps wastes as an ingredient for clay-based bricks were also briefly addressed.

Graphic Abstract

中文翻译：

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将荧光灯废料掺入红粘土砖中：缺陷形成，物理和机械性能

摘要

荧光灯一旦使用寿命结束，由于其汞含量，通常会在真空破碎机中进行处理。此过程会产生玻璃废料和废磷光体粉末，以及其他残留材料。由于它们的成分，玻璃废料和磷光体粉末可以作为次要原料掺入用于非结构性应用的粘土基建筑材料配方中。在这项工作中，对这种结合进行了研究，重点是分析最终产品中缺陷的形成及其对黏土某些物理和机械性能的统计变异性的影响，例如：密度，线性收缩，吸水率，以及抗压强度。发现各种因素的结合，即废玻璃中Pb和碳酸钙的存在，有助于在烧结陶瓷中形成两种缺陷：内部气孔和外部玻璃状渗出物。尽管存在这些缺陷，但生产的测试砖的物理和机械性能与用作对照的标准配方在统计学上没有差异。这些发现对废荧光灯废料可能用作粘土砖的一种成分的影响也作了简要介绍。

图形摘要