The preparation of lightweight aggregate (LWA) by high-temperature sintering is a promising method for recycling solid waste safely, especially for solidifying heavy metals effectively. The main aim of this research was to systematically evaluate the effects of the flux components on LWA, including Na₂O, MgO, CaO, and Fe₂O₃. The physical properties and chromium solidification mechanism of LWA were characterized and analyzed. The results showed that the addition of Na facilitated LWA preparation and Cr solidification, whereas Ca, Mg, and Fe were deleterious to some extent. Further analysis indicated that increasing the Fe₂O₃ content was not conducive to the reduction of Cr because its decomposition reaction creates an oxygen-rich environment. The results of this research could provide a meaningful guide for regulating the composition of raw materials for the production of LWA to treat industrial Cr-containing solid waste.

通过高温烧结制备轻质骨料（LWA）是一种安全回收固体废物，特别是有效固化重金属的有前途的方法。这项研究的主要目的是系统地评估助焊剂成分对LWA的影响，包括Na ₂ O，MgO，CaO和Fe ₂ O ₃。对LWA的物理性质和铬的凝固机理进行了表征和分析。结果表明，Na的添加促进了LWA的制备和Cr的凝固，而Ca，Mg和Fe在一定程度上有害。进一步分析表明，增加了Fe ₂ O ₃含量不利于Cr的还原，因为其分解反应会形成富氧环境。这项研究的结果可以为调节用于生产工业含铬固体废物的LWA生产的原料组成提供有意义的指导。