硅酸盐通报2025，Vol.44Issue(4)：1566-1573,8.DOI:10.16552/j.cnki.issn1001-1625.2024.1205
低碳窑渣固废陶瓷烧制过程无机矿相演变及重金属固化机理
Evolution of Inorganic Mineral Phases and Heavy Metal Solidification Mechanisms in Ceramic Production Process from Low-Carbon Slag Solid Waste
摘要
Abstract
Zinc secondary slag is a type of low-carbon solid waste rich in heavy metals,and its conversion into ceramics can achieve resource utilization.This study employed X-ray diffraction(XRD)analysis and heavy metal leaching experiments to investigate the effects of preheating temperature on the physical properties and heavy metal solidification efficacy of ceramics derived from low-carbon slag solid waste.The ceramic samples produced after preheating at 500 ℃ exhibit optimal performance.The preheating process effectively removes carbon and sulfur components from the ceramic green body and facilitates the early volatilization of volatile substances,thereby reducing internal micropores during subsequent sintering and enhancing densification.This ultimately leads to a significant improvement in the bending strength of the ceramic samples.During the sintering process following preheating,Fe2+is oxidized to free Fe3+,promoting the transformation of clinopyroxene to pyroxene.The pyroxene structure possesses excellent heavy metal solidification capabilities,with some Zn2+and Mn4+being fixed in this structure.Additionally,the presence of sulfates within the ceramics promoted its silicoaluminization.Heavy metal leaching experiments reveal that the release rates of various heavy metals are less than 0.3％,with their leaching concentrations being 1～2 order of magnitude lower than national standard limits.Ceramics prepared from preheated low-carbon slag solid waste not only exhibit excellent mechanical properties,but also demonstrate good heavy metal solidification effects,making them suitable for the resource utilization of heavy metal-containing solid waste.关键词
窑渣/低碳固废/陶瓷/预热/重金属固定/重金属浸出Key words
slag/low-carbon solid waste/ceramics/preheating/heavy metal solidification/heavy metal leaching分类
环境科学引用本文复制引用
郭正旺,肖海平,张绪钦,李岩,李宇..低碳窑渣固废陶瓷烧制过程无机矿相演变及重金属固化机理[J].硅酸盐通报,2025,44(4):1566-1573,8.基金项目
国家重点研发计划(2019YFC1905705) （2019YFC1905705）
