太原理工大学学报2026，Vol.57Issue(3)：467-475,9.DOI:10.16355/j.tyut.1007-9432.20250611
煤矸石钠化焙烧反应机理与过程调控研究
Reaction Mechanism and Process Regulation of Sodium-Assisted Roasting of Coal Gangue
摘要
Abstract
[Purposes]To enhance the recovery efficiency of valuable metals from coal gangue,in this study,the mechanism and process regulation of sodium roasting are investigated with Na2CO3 as an activator within the temperature range of 200-900℃.[Methods]The phase transformation behav-ior and structural evolution during roasting were systematically characterized by SEM,FTIR,XRD,XPS,and TG-DSC analyses.[Results]Results indicate that 800℃is the optimal roasting tempera-ture,at which the dense lamellar structure of coal gangue transforms into a porous amorphous mor-phology and crystalline nepheline(NaAlSiO4)can be formed.The coordination environment of alumi-num changes from octahedral[AlO6]to tetrahedral[AlO4],leading to enhanced reactivity.Kinetic analysis based on the Kissinger model reveals an apparent activation energy of 52.91 kJ·mol-1 for the main reaction stage.Thermodynamic calculations by using HSC Chemistry and FactSage show that the reaction SiO2+NaAlO2→NaAlSiO4 exhibits negative Gibbs free energy across the entire tempera-ture range,indicating its spontaneous behavior.At 800℃,the Gibbs free energy reaches equilibrium,consistenting with the experimental results.This study elucidates the structural evolution and thermo-dynamic stability mechanism of sodium-roasted coal gangue,providing theoretical guidance for the ef-ficient metals extraction and resources utilization of high-alumina solid wastes.关键词
煤矸石/钠化焙烧/动力学/热力学模拟/FactSageKey words
coal gangue/sodium roasting/kinetics/thermodynamic simulation/FactSage分类
化学化工引用本文复制引用
刘田田,陈金慧,李淑明,程萌,应子文,王建成,吴桂选..煤矸石钠化焙烧反应机理与过程调控研究[J].太原理工大学学报,2026,57(3):467-475,9.基金项目
国家重点研发计划2024YFC2910900和2024YFC3907704 （）
国家自然科学基金52404421 （）
中国博士后科学基金2024M751661 （）
