(江西理工大學(xué) 資源與環(huán)境工程學(xué)院，贛州 341000)
摘 要: 采用煅燒高嶺石的方法制備礦物聚合材料，采用DTA−TG、XRD和IR分析等手段研究高嶺石經(jīng)過熱處理后的結(jié)構(gòu)轉(zhuǎn)變過程。結(jié)果表明：熱處理直接影響到高嶺石結(jié)構(gòu)轉(zhuǎn)變及煅燒高嶺石的活性。煅燒后，高嶺石的結(jié)構(gòu)轉(zhuǎn)變經(jīng)歷了脫羥基(約541 ℃)、偏高嶺石化(541～850 ℃)和Al2O3分凝(＞950 ℃)3個過程，煅燒溫度達到950 ℃后，生成新相γ-Al2O3。通過對煅燒高嶺石所制備的礦物聚合材料抗折強度的評價確定了煅燒高嶺石活性較適宜的熱處理制度：煅燒溫度為850 ℃，煅燒時間3 h。煅燒高嶺石的長程無序特征是煅燒高嶺石具有較高活性的原因，γ-Al2O3的生成是導(dǎo)致煅燒高嶺石活性下降和礦物聚合材料抗折強度降低的主要原因。
關(guān)鍵字: 高嶺石；煅燒；活性；結(jié)構(gòu)轉(zhuǎn)變；礦物聚合材料
activities of kaolinite
（Faculty of Resource and Environmental Engineering, Jiangxi University of Science and Technology,
Ganzhou 341000, China）
Abstract:The geopolymers were prepared by calcining kaolinite. The structure transformation for calcined kaolinite was studied by means of differential thermal analysis-thermal gravity, X-ray diffraction and infrared. The results show that heat treatment directly affects the structure transformation of kaolinite and activity of calcination kaolinite. The structure transformation for calcined kaolinite is undergone some stages including kaolinite dehydroxylation (about 541 ℃), metakaolinite formation (541−850 ℃) and Al2O3 segregation (＞950 ℃). The new phase formed at 950 ℃ is γ-Al2O3. The activity of calcined kaolinite is estimated by testing the bending strength of geopolymers which are made of calcined kaolinite, the heat treatment of proper calcined kaolinite activity is calined at 850 ℃ for 3 h. The calcined kaolinite has a high activity because of long-range disorder of metakaolinite structure characteristic. The activity of calcined kaolinite and bending strength of geopolymers decrease because of γ-Al2O3 forming.
Key words: kaolinite; calcination; activity; structure transition; geopolymer
