Liu Xiaomin, Wu Yufeng, Pan De'an, Li Bin, Wang Wei
Institute of Circular Economy, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, PR China.
Institute of Circular Economy, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, PR China.
Sci Total Environ. 2023 Nov 25;901:165754. doi: 10.1016/j.scitotenv.2023.165754. Epub 2023 Jul 30.
Due to containing abundant FeO and trace heavy metals (Pb, As, Cr, Cd, etc.), the disposal of lead/zinc smelting slag (LSS-ZSS) with ultra-high historical reserves has attracted increased attention. Using LSS-ZSS to prepare glass-ceramics is a good method to solve the problem of LSS-ZSS accumulation and realize heavy metal solidification, whereas there are some technical challenges that are difficult to deal with. A large amount of FeO component in LSS-ZSS would not only lead to melt overflow, but also cause early crystallization of basic glass. In this work, through the directional modification of LSS-ZSS and the subsequent crystallization kinetics regulation, we successfully prepare high performance glass-ceramics with andradite and hematite as the main crystal phases. In addition, by means of SEM, PXRD, FTIR spectra and XPS, the morphology/phase transformation, fine structure and valence variations of iron components in LSS-ZSS at different temperature zones are systematically studied. The maximum shrinkage rate of resultant basic glasses is 27 %, and the maximum flexural strength and compressive strength of glass-ceramics are 128 MPa and 890 MPa, respectively. This work would not only benefit to solve the problem of resource utilization of harmful LSS-ZSS, but also provide a possible reference for the utilization of iron-rich waste slag in magnetic properties related fields.
由于含有丰富的FeO以及痕量重金属（Pb、As、Cr、Cd等），具有超高历史储量的铅锌冶炼渣（LSS-ZSS）的处置已引起越来越多的关注。利用LSS-ZSS制备微晶玻璃是解决LSS-ZSS堆积问题并实现重金属固化的一种好方法，然而存在一些难以应对的技术挑战。LSS-ZSS中大量的FeO成分不仅会导致熔体溢出，还会引起基础玻璃的早期结晶。在这项工作中，通过对LSS-ZSS进行定向改性并随后调控结晶动力学，我们成功制备了以钙铁榴石和赤铁矿为主要晶相的高性能微晶玻璃。此外，借助扫描电子显微镜（SEM）、粉末X射线衍射（PXRD）、傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS），系统研究了LSS-ZSS在不同温度区域铁成分的形貌/相变、精细结构和价态变化。所得基础玻璃的最大收缩率为27%，微晶玻璃的最大抗弯强度和抗压强度分别为128MPa和890MPa。这项工作不仅有利于解决有害LSS-ZSS的资源利用问题，还可为磁性相关领域富铁废渣的利用提供可能的参考。
