粉煤灰和镁渣混合成纤原料升温过程中晶相转化研究  

The study on Crystallization Phase Transformation of Fiber Raw Material Mixed with Fly Ash and Magnesium Slag during Temperature Increase

作　　者：温旭辉 张金才 廖洪强 程芳琴 WEN Xuhui;ZHANG Jincai;LIAO Hongqiang;CHENG Fangqin(Institute of Resourcesand Environment Engineering of Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学资源与环境工程研究所

出　　处：《粉煤灰综合利用》2019年第6期11-16,共6页Fly Ash Comprehensive Utilization

基　　金：山西省煤基重点科技攻关项目(MC2014-06);山西大学人才事业启动项目(0228-228545021);山西省“1331工程”重点创新团队建设计划

摘　　要：以利用燃煤锅炉粉煤灰与镁揸复配生产纤维为目的,研究不同配方样品升温至熔融温度过程中,样品内部晶体种类、组成,及转化规律。选取有代表性的三种样品,分别在接近熔融温度50T、100T、150T:和熔融温度下对样品进行煅烧,采用XRD、FT-IR、SEM等测试手段对样品进行表征。结果发现:随着原料配比的不同,样品中的晶相组成会发生明显变化;分析XRD图谱发现,经高温处理后,粉煤灰和镁揸混合原料形成镁黄长石、镁钙铝黄长石、钙长石、莫来石和拉长石。粉煤灰掺人量较少的样品主晶相为镁黄长石和镁钙铝黄长石,粉煤灰掺量增加后,出现新的拉长石晶相,并且取代镁黄长石和镁钙铝黄长石成为主晶相。所有样品在熔融温度处经lh处理,内含晶体物相全部消失,转化为玻璃态物相;FT-IR结果显示经过高温处理后,样品中的Si-0、A1-0键由于晶体的破坏而明显增多,在拉长石特征峰区域内吸收峰的变化符合XRD中晶体种类变化的规律。For the purpose of producing fiber by using coal-fired boiler fly ash and magnesium slag,the paper studied the types,composition and the regular pattern in the process of which different form ulas heating up to the melting tem perature.Three representative sam ples were selected and calcined at that approaching the melting temperature at 50丈、100 T l、150 and the melting trmperature.The samples were characterized by XRD,F T-IR and SEM.The results show that the crystal phase composition of the sample changed obviously with the different ratio of raw materials.Analysis of the XRD pattern revealed that after high tem perature treatment,the mixed raw materials of fly ash and magnesium slag formed akerm anite,gehlenite,anorthite,m ullite and labradorite.The main crystal phases of the sam ples with less fly ash incorporation areakerm anite and gehlenite.With the increase of fly ash incorporation,new labradorite crystal phases appeared and replaced akerm anite and gehlenite to become the main crystal phases.After all the samples were treated at the melting temperature for 1 h,the crystal phase contained in the sample disappeared and converted into a glassy phase;F T-IR results shows that after high tem perature treatment,the S i-0 and Al—0 bonds in the samples increased significantly due to the destruction of crystals,and the change of absorption peak in the characteristic peak area of labradorite was consistent with the change of crystal types in XRD.

关 键 词：粉煤灰 镁渣 晶相转变 拉长石 

分 类 号：TQ343+.9[化学工程—化纤工业]