高比表面积煤系高岭土材料的制备及其结构表征

Preparation of Large Specific Surface Area Coal-bearing Kaolin by an Acid Activation Method and Its Properties

高比表面积改性煤系高岭土具有优异的性能,现已被广泛地应用于多种行业。本文以内蒙煤系高岭土为原料,将其高温煅烧制得偏高岭土后,再经盐酸改性用以制备高比表面煤系高岭土材料;通过X射线衍射(XRD)、差热-热重分析(DTA-TGA)和N2吸附-脱附等手段对改性前后煤系高岭土的晶体结构及比表面积进行了表征,实验考察了煅烧温度、煅烧时间、盐酸用量、盐酸浓度及反应时间对煅烧煤系高岭土比表面积的影响,确定了酸改性煤系高岭土的最佳工艺条件;在最佳工艺条件下制备的盐酸改性煤系高岭土材料的比表面积高达465 m2/g。

Large specific surface area activated coal-bearing kaolin which has excellent characters is widely used in various industries.In this study,kaolinite material with a large specific surface area was prepared from Inner Mongolia coal-bearing kaolinite by high temperature heat treatment and hydrochloric acid treatment.The crystal structure and specific surface area were characterized by using X-ray diffraction and N2adsorption-desorption.The thermogravimetry analysis（TGA） and differential thermal analysis（DTA） were collected also.The effects of calcination temperature,calcination time,dosage of hydrochloric acid,concentration of hydrochloric acid and acid treatment time on the specific surface area of calcined coal-bearing kaolinite were investigated to determine the optimum condition.The maximum specific surface area of the kaolinite material prepared under the optimum condition was as large as 465 m^2/g.