热处理对地开石—醋酸钾插层的影响  

Effect of heat treatment on dickite-potassium acetate intercalated complex

作　　者：钟祥华[1,2] 刘羽[2] 许涛[3] 刘文元[2] 

机构地区：[1]福州大学材料学院,福建福州350108 [2]福州大学紫金矿业学院,福建福州350108 [3]紫金矿业集团股份有限公司,福建上杭364200

出　　处：《材料热处理学报》2016年第12期121-126,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(41002016);福建省教育厅基金(JA15096);福州大学科技发展基金(650075)

摘　　要：采用溶液浸泡法制备地开石—醋酸钾插层复合物,利用热重-差热仪（TG-DSC）分析复合物的热稳定性,X射线衍射（XRD）、傅里叶红外光谱仪（FTIR）和场发射扫描电镜（FESEM）研究热处理温度对样品稳定性的影响。结果表明,热处理过程中的变化包括：300℃以下的低温反应阶段,吸附水脱去并伴随醋酸根离子烧失,d（002）由1.41 nm变成0.908 nm,再缩小至膨胀前的0.717 nm;400~900℃的中温反应,此阶段主要发生脱羟基作用,变成无定型偏地开石;900℃以上的高温反应,即固态相变阶段,生成莫来石和方石英。研究发现,地开石—醋酸钾热处理后,偏地开石的转变温度降低200℃左右,莫来石的相变转变温度升高30℃。The thermal decomposition process of dickite-potassium acetate（KAc） intercalated complex had been studied by means of thermo-gravimetric（TG）,differential scanning calorimetry（DSC）,XRD,FTIR and field emission scanning electron microscope（FESEM）. The XRD results show that the KAc have been successfully intercalated into dickite through immersion. The stability of intercalated compound is affected by heat treatment temperature. The first step（〈 300 ℃） is loss of acetate and the water coordinated to KAc and resulted in the basal d（002）of 1. 41 nm turning to 0. 908 nm and finally 0. 71 nm. And then（400 ℃-900 ℃） inner surface hydroxyls,inner hydroxyls,hydrogen bonds formed water and lost,produced amorphous meta-dickite. The last step（900 ℃-1300 ℃） is to form mullite and cristobalite. The de-hydroxylation temperature of dickite-KAc decreased about 200 ℃ and temperature of mullite formation increased about 30 ℃ compared with dickite.

关 键 词：热处理 地开石 醋酸钾 稳定性 

分 类 号：TB321[一般工业技术—材料科学与工程]