Suspension roasting process of vanadium-bearing stone coal:Characterization,kinetics and thermodynamics  

含钒石煤的悬浮焙烧过程:特性表征、热力学、动力学

作　　者：Shuai YUAN Yong-hong QIN Yong-peng JIN Yan-jun LI 袁帅;秦永红;金永朋;李艳军(东北大学资源与土木工程学院,沈阳110819;国家地方难选铁矿资源高效开采技术联合工程研究中心,沈阳110819)

机构地区：[1]School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China [2]National−Local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources,Shenyang 110819,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第11期3767-3779,共13页中国有色金属学报（英文版）

基　　金：the Fundamental Research Funds for the Central Universities of China(No.N2101023).

摘　　要：The thermodynamics,kinetics,phase transformation,and microstructure evolution of vanadium-bearing stone coal during suspension roasting were systematically investigated.Thermodynamic calculations showed that the carbon in the stone coal burned and produced CO_(2) in sufficient oxygen during roasting.The mass loss of stone coal mainly occurred within the temperature range from 600 to 840℃,and the thermal decomposition reaction rate increased to the peak at approximately 700℃.Verified by the Flynn−Wall−Ozawa(FWO)and Kissinger−Akahira−Sunose(KAS)methods,the thermal decomposition reaction of stone coal was described by the Ginstling−Brounshtein equation.The apparent activation energy and pre-exponential factors were 136.09 kJ/mol and 12.40 s^(−1),respectively.The illite in stone coal lost hydroxyl groups and produced dehydrated illite at 650℃,and the structure of sericite was gradually destroyed.The surface of stone coal became rough and irregular as the temperature increased.Severe sintering occurred at the roasting temperature of 850℃.系统地研究含钒石煤在悬浮焙烧过程中的热力学、动力学、物相转化和微观结构演变。热力学计算表明,在焙烧过程中,石煤中的碳在氧气充足的情况下燃烧并生成CO_(2),石煤的主要质量损失区间为600~840℃,热分解反应速率在700℃左右达到峰值。通过Flynn−Wall−Ozawa(FWO)和Kissinger−Akahira−Sunose(KAS)方法验证,石煤的热分解反应由Ginstling−Brounshtein方程描述,表观活化能和指数前因子分别为136.09 kJ/mol和12.40 s^(−1)。石煤中的伊利石在650℃时失去羟基,产生脱水伊利石,绢云母结构被逐渐破坏。随着温度的升高,石煤表面变得粗糙且不规则,焙烧温度为850℃时烧结严重。

关 键 词：vanadium-bearing stone coal thermodynamics thermal decomposition kinetics phase transformation microstructure evolution 

分 类 号：TF841.3[冶金工程—有色金属冶金]