Transformation of Mineral Matter of Lignite Ash under Weak Reducing Atmosphere
Experiments have been conducted with Huolinhe (HLH) and Xiaolongtan (XLT) lignite ashes to investigate the mineral transformation under weak reducing atmosphere along with temperature increase by SEM-EDX and XRD,in order to optimize operational parameters of fluid-bed lignite gasification technology.The results show that the initial melted parts are primarily the result of wustite interacted other minerals under weak reducing atmosphere.Wustite can react with aluminosilicate minerals to form some low-melting eutectic compounds,and cause the initial melting temperature to decrease by about 200℃ compared with the deformation temperature.Mullite is formed at 1000℃ or so,and its content increases and then decreases with the temperature increase,and reaches maximum at 1200℃.Gehlenite and anorthite come from the reaction between calcium oxide and mullite.Owing to the generation of some gases during mineral transformation under weak reducing atmosphere,many holes are formed on the surface of molten ash
Lignite ash:Weak reducing atmosphere:Mineral transformation
Fenghai Li Jiejie Huang Yitian Fang Yang Wang
Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China Graduate School of Chin Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China
国际会议
The 8th International Symposium on Gas Cleaning at High Temperatures(第八届国际高温气体净化技术研讨会 GCHT-8)
太原
英文
441-454
2010-08-23（万方平台首次上网日期，不代表论文的发表时间）