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      石膏變為熟石膏程度的DSC測量
      2017-11-13 16:48:47

      熟石膏(硫酸鈣半水合物)是由石膏(硫酸鈣二水合物)部分失水制得。

      在類似條件下,該反應可進一步進行,生成無水硫酸鈣,因此欲完全轉為半水合物,則必須嚴格控制煅燒溫度。

      石膏向熟石膏的定量轉化,對于生產來說是很重要的。由于熟石膏有易于吸濕復而轉為石膏的傾向,需檢測在貯藏過程中熟石膏中石膏含量變化。采用差示掃描量熱法可以完成此種測定。生石膏的純度也可用這種方法快速準確的測定。

      該法是測定石膏→熟石膏的反應熱。利用純硫酸鈣二水合物為標準物質進行標定,可訂量計算材料中石膏含量。

      準確稱取2~5mg試,至于金制的DSC容器中,加蓋壓封。以同樣的空容器為參比端。在70~220℃范圍內以5℃/min的速率升溫,測得138℃開始的吸熱反應。(如圖)

      純石膏的 可由標準物質測得,是122.2J/g。石膏的質量分數也可由事先測繪的已知組成的混合物的工作曲線來查找。

      由于水與鋁之間的反應干擾此測量,因此不能采用鋁制試樣容器


         
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