摘要
利用X射线衍射分析仪(XRD)和电感耦合等离子原子发射光谱仪(ICP-AES),分别研究了朔州煤中锂(Li)、镓(Ga)和稀土(REE)元素在空气、氮气(N_2)和二氧化碳气氛(CO_2)下从300℃升温至1100℃过程中的迁移规律。结果表明:在300℃～600℃范围内,煤中的Li,Ga和REE元素在热处理过程中逸出速率较大,主要与有机质的分解有关;当温度高于600℃时,Li,Ga和REE的逸出速率降低并逐渐趋于稳定。热处理气氛对微量元素的逸出有显著影响,空气气氛中Li,Ga和REE的挥发率最大,N_2和CO_2气氛下Li,Ga和REE的挥发率相当,均比空气气氛中挥发率小,煤中有机质的氧化能够促进微量元素在热处理过程中的逸出。
Transformation of valuable elements was investigated,including lithium(Li),gallium(Ga)and rare-earth elements(REE)in coal during the heat treatment process in air,nitrogen and carbon dioxide atmosphere.The X-ray diffraction analyzer(XRD)and inductively coupled plasma atomic emission spectrometer(ICP-AES)were used in this work.The results show that Li,Ga,and REE in coal have a large escape rate during the heat-treatment in the range of 300℃-600℃,which is mainly related to the decomposition of the organic matter in coal during heat treatment.The escape rate of Li,Ga,and REE decreases and gradually becomes stable when the temperature is higher than 600℃.The atmosphere has a significant effect on the escape of these elements.The volatilizations of Li,Ga,and REE in coal in the air atmosphere are the largest among those in three atmospheres.The volatilization of Li,Ga,and REE are comparable in N2 and CO2 atmospheres and are lower than that in air atmosphere,which implies that the escape of these valuable elements can be promoted by the oxidation of organic matter in coal during the heat-treatment process.
作者
张森
马志斌
郭彦霞
程芳琴
ZHANG Sen;MA Zhibin;GUO Yanxia;CHENG Fangqin(State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources,Shanxi Collaborative Innovation Center of High Value-added Utilization of Coal-related Wastes,Institute of Resources and Environment Engineering,Shanxi University,030006 Taiyuan,China)
出处
《煤炭转化》
CAS
CSCD
北大核心
2019年第2期8-12,共5页
Coal Conversion
基金
国家重点研发计划项目(2017YFB0603101)
山西省2016年度煤基低碳重大专项项目(MC2016-05)
关键词
锂
镓
稀土
气氛
热处理
迁移
Li
Ga
REE
atmosphere
heat treatment
migration
