烧结法赤泥对晋城无烟煤灰熔融特性的影响  

Effect of the Red Muds on Ash Fusion Characteristics of Jincheng Coal

作　　者：张文玲[1] Zhang Wenling(School of Engineering Management,Xinjiang Vocation and Technical College of Construction,Urumqi,Xinjiang,China)

机构地区：[1]新疆建设职业技术学院工程管理学院,新疆乌鲁木齐830054

出　　处：《矿产综合利用》2018年第6期111-115,共5页Multipurpose Utilization of Mineral Resources

摘　　要：本文分别研究了向晋城无烟煤(JC)煤灰中掺入不同比例的烧结法赤泥1~#和烧结法赤泥2~#,对混合灰样熔融特性的影响。结果表明,当向JC煤灰中掺入15%的烧结法赤泥1~#或30%的烧结法赤泥2~#时可以使JC煤灰熔点降到1350℃以下,使JC达到液态排渣的要求。根据对煤灰和赤泥中化学成分以及灰中矿物质演变分析做出以下推测,添加烧结法赤泥能降低JC煤灰熔点的主要原因是高温下生成了低熔点的霞石(Na_2O·Al_2O_3·2SiO_2)和生成了低共熔化合物铁橄榄石(Fe_2SiO_4)与铁尖晶石(Fe_2Al_2O_4)、钙黄长石(Ca_2Al_2Si_2O_7)与钙长石(CaAl_2Si_2O_8)。Jincheng anthracite(JC)is a high ash fusion temperature(AFT)coal,which does not meet the requirements of slagging in entrained flow gasifier.In this paper the effect of two red muds were on AFT of JC.was studied.Results showed that when the two red muds ratio were 15%(1#)and 30%(2#)respectively,the mixed ash AFT decreased below 1350℃,meeting the requirement of slagging.The mixed ash fusion mechanism was investigated from chemical composition of coal ash and red mud and mineral evolution in high temperature.With the addition of red muds,the formation of low melting point mineral nepheline(Na2O·Al2O3·2SiO2),fayalite(Fe2SiO4),spinel(Fe2SiO4),gehlenite(Fe2Al2O4),calcium feldspar(CaAl2Si2O8)and their low melting point eutectics lead to a decrease in AFT of JC mixed ash.

关 键 词：无烟煤 烧结法赤泥 灰熔融特性 熔融机理 

分 类 号：TD989[矿业工程—选矿]