摘要
为研究多金属复杂黄铜矿的非等温热分解动力学行为,在氩气气氛中对多金属复杂黄铜矿进行热重-差示扫描量热法(TG-DSC)分析,用FWO法、Kissinger法和Coats-Redfern法计算多金属复杂黄铜矿热分解的活化能(Eα)、指前因子(A)和机理函数,并采用XRD和SEM-EDS表征热解产物的矿相结构和形貌。研究结果表明:原料中黄铜矿热解后转变为相应的铜和铁的硫化物,形貌由致密的块状结构转变为有裂隙的疏松多颗粒状。多金属复杂黄铜矿的热分解可以分为2个阶段,其中,第一阶段为40~300℃,符合R3模型(体积收缩模型),表观活化能(Eα)为11.422 kJ/mol,指前因子的对数(lgA)为-1.882;第二阶段为300~650℃,符合AE4模型(Avrami-Erofeev方程),表观活化能(Eα)为134.233 kJ/mol,指前因子的对数(lgA)为9.777。
In order to study the dynamic behavior of non-isothermal pyrolysis of complex polymetallic chalcopyrite, thermogravimetric differential scanning calorimetry(TG-DSC) analysis was carried out in argon atmosphere. The activation energy(Eα), pre-exponential factor(A) and mechanism function of the pyrolysis of complex polymetallic chalcopyrite were calculated by the methods of FWO, Kissinger and Coats-Redfern, and the mineral phase structure and morphology of pyrolyzed products were characterized by XRD and SEM-EDS. The results show that chalcopyrite in the raw material is transformed into corresponding copper and iron sulfides after pyrolysis, and the morphology of pyrolyzed products changes to loose multi-granular shape with cracks from the dense massive structure of the raw material, and that the pyrolysis of chalcopyrite can be divided into two stages.The first stages carried out at the temperature of 40-300 ℃, which is consistent with the R3 model(volume shrinkage model) with the apparent activation energy(Eα) of 11.422 kJ/mol and the logarithm of pre-exponential factor(lgA) of-1.882. The second stage occurs at the temperature in the range of 300-650 ℃, which conforms to AE4model(Avrami-Erofeev equation) with the apparent activation energy(Eα) of 134.233 kJ/mol, and the logarithm of pre-exponential factor(lgA) of 9.777.
作者
吴越
廖亚龙
马海飞
嵇广雄
刘庆丰
郗家俊
WU Yue;LIAO Yalong;MA Haifei;JI Guangxiong;LIU Qingfeng;XI Jiajun(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第2期443-455,共13页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(21978122,21566017)。
关键词
黄铜矿
热解
相变
非等温动力学
chalcopyrite
pyrolysis
chase change
non-isothermal kinetics
