The production of lightweight aggregates from waste is regarded as an environmentally benign means of recycling waste into materials for green building construction, supporting the circular economies of modern societies. In this investigation, aggregates are synthesized from industrial sludge-marine clay mixes using thermal sintering at 1000‒1300 °C with or without the addition of two sodium salts. The sludge-clay 50/50 mix that is fired at 1200 °C and the 0/100 to 50/50 mixes that are fired at 1300 °C yield aggregates with a specific gravity of less than unity (lightweight aggregates). The addition of two sodium salts at 1.5% w/w facilitated the formation of lightweight aggregates. This study reports the first time the production of ultra-lightweight aggregates with a specific gravity of less than 0.35 g/cm³ and sufficiently low water adsorption ratios from a 50/50 mixture with added NaCl and from a 20/80 mix with added Na₂CO₃ for construction material use. The sodium salt is posited to change the melt properties at the firing temperature used, causing the molten layers to retain their integrity when subjected to gas blasting with the formation of large internal pores and sufficient surface sealing.

从废物中生产轻质骨料被认为是将废物回收再利用为绿色建筑材料的一种环境友好手段，从而支持了现代社会的循环经济。在这项研究中，骨料是通过在1000C1300°C下进行热烧结，并添加或不添加两种钠盐，从工业污泥-海洋粘土混合物中合成的。在1200°C下燃烧的污泥-粘土50/50混合物和在1300°C下燃烧的0/100至50/50混合物产生的比重小于1的集料（轻质集料）。以1.5％w / w加入两种钠盐有助于形成轻质聚集体。该研究报告首次生产了比重小于0.35 g / cm ³的超轻集料以及从50/50的添加NaCl混合物和从20/80的添加Na ₂ CO ₃混合物的吸水率，以用于建筑材料。沉积钠盐以改变所用焙烧温度下的熔体性能，使熔体层在进行气体喷砂处理时保持其完整性，并形成大的内部孔并具有足够的表面密封性。