【摘要】 <正>高岭土为三斜晶系,一般为无色至白色的细小鳞片,单晶呈假六方板状或书册状,平行连生的集合体往往呈蠕虫状或手风琴状,是造纸、陶瓷、化工、涂料、医药和国防等几十个行业中必须的矿物更多还原

【Abstract】 The process of phase transformation of kaolinite was investigated by differential scanning calorimetry(DSC) and X-ray power diffraction(XRD).The iterative procedure along with the minimum deviation was employed to determine the kinetic parameters of phase transformation of kaolinite.Results show that the kaolinite phase transformation occurs from the metakaolin into mullite in the temperature range 975~1 040 ℃.The kaolinite phase transformation conforms to an accommodated nuclei production and nuclei growth model.The corresponding mechanism functions are f(α)=3(1-α)[-ln(1-α)]2/3 and G(α)=[-ln(1-α)]1/3.The activation energy Ea and preexponential factor A of kaolinite phase transformation are 840.44 kJ·mol-1 and 1.54×1034~1.65×1034 s-1,respectively.更多还原