Laboratory of Materials Technology and Process Engineering (LTMGP), University of Bejaia, 06000, Bejaia, Algeria.
Laboratory of Construction Engineering and Architecture (LGCA), University of Bejaia, 06000, Bejaia, Algeria.
Environ Sci Pollut Res Int. 2022 Apr;29(18):26792-26809. doi: 10.1007/s11356-021-16787-x. Epub 2021 Dec 2.
The aim of this study was to recycle dredged sediments as an alternative raw material in the production of ceramic tiles. The effect of the substitution of kaolin by raw sediment (HDS) and calcined sediment (HDSC) in the mixture of the ceramic tile samples sintered at 1100 and 1200 °C was studied. The samples were prepared with different proportions of HDS and HDSC (0, 10, 20 and 30 wt.%) substituting kaolin. The mineralogical analysis of the samples shows that mullite phase disappears in the samples incorporating raw sediments (HDS) and fired sediments (HDSC) leading to the formation of new crystalline phases such as anorthite and diopside.Moreover, ceramic tile samples with 20 wt.% of calcined sediment improve its densification and hence the compressive strength (171 MPa) and thermal conductivity (0.555 W/mK). An evaluation of the leaching was carried out in the ceramic samples, finding that the concentrations of heavy metals in the leachate were within the safety limit established by the USEPA. The heavy metals were immobilised in the ceramic matrix. Therefore, the results showed that dredged sediment (HDS) and calcined sediment (HDSC) could be used as substituent of kaolin to produce eco-friendly ceramic building materials as floor tile ceramics.
本研究旨在将疏浚沉积物回收再利用为陶瓷生产的替代原料。研究了在 1100 和 1200°C 烧结的陶瓷砖样品混合物中，高岭土被原状沉积物（HDS）和煅烧沉积物（HDSC）替代的影响。样品用不同比例的 HDS 和 HDSC（0、10、20 和 30wt.%）替代高岭土制备。样品的矿物分析表明，原状沉积物（HDS）和煅烧沉积物（HDSC）中引入的莫来石相消失，导致形成新的结晶相，如钙长石和透辉石。此外，掺入 20wt.%煅烧沉积物的瓷砖样品提高了其致密度，从而提高了抗压强度（171MPa）和导热系数（0.555W/mK）。对陶瓷样品进行了浸出评估，发现浸出液中重金属的浓度在 USEPA 规定的安全范围内。重金属被固定在陶瓷基质中。因此，结果表明，疏浚沉积物（HDS）和煅烧沉积物（HDSC）可用作高岭土的替代品，用于生产环保型建筑陶瓷材料，如地板瓷砖。
