Li Hesong, Liu Cheng, Tang Yikun, Zhao Shilin
Hunan Engineering Research Center of Clean and Low-Carbon Energy Technology, School of Energy Science and Engineering, Central South University, Changsha 410083, China.
Materials (Basel). 2025 Jul 18;18(14):3372. doi: 10.3390/ma18143372.
The sustainable utilization of solid waste is crucial for environmental protection. This work investigates the fabrication of foamed ceramics from Cr slag and municipal solid waste incineration (MSWI) fly ash, focusing on the effects of three inhibitors-NHSOH, ZnO·TiO, and (NH)HPO-on material properties and Cr leaching behavior. Experimental analysis, chemical thermodynamic calculations, and material characterization were all employed. Results show that the prepared foamed ceramics meet the JG/T 511-2017 standard for building materials, exhibiting excellent physical properties but significant Cr leaching. Among the inhibitors, (NH)HPO with a molar ratio of n(P)/n(Cr) = 1 shows the best performance, achieving a bulk density of 205 kg/m, compressive strength of 0.850 MPa, Cr leaching concentration of 188 μg/L, and a 70.0% of Cr leaching inhibition rate. The improvement is attributed to the AlPO formation that enhancing the strength, and CaPO that stabilizing Cr during sintering. This work provides a feasible method for the safe resource utilization of Cr-containing waste.
固体废物的可持续利用对环境保护至关重要。本研究探讨了以铬渣和城市固体废物焚烧（MSWI）飞灰制备泡沫陶瓷，重点研究了三种抑制剂——NHSOH、ZnO·TiO和(NH)HPO对材料性能及Cr浸出行为的影响。采用了实验分析、化学热力学计算和材料表征等方法。结果表明，制备的泡沫陶瓷符合JG/T 511-2017建筑材料标准，具有优异的物理性能，但Cr浸出量较大。在抑制剂中，摩尔比n(P)/n(Cr)=1的(NH)HPO表现最佳，其体积密度为205 kg/m，抗压强度为0.850 MPa，Cr浸出浓度为188 μg/L，Cr浸出抑制率达70.0%。这种改善归因于增强强度的AlPO的形成以及烧结过程中稳定Cr的CaPO的形成。本研究为含铬废物的安全资源利用提供了一种可行方法。
