• 作者： 林正雄; 陳大受
• 作者服務機構： 國立清華大學材料科學研究所
• 中文摘要： 本實驗之內容係利用鹽酸浸漬法自金門高嶺土中提煉氧化鋁。討論了鹽酸浸漬、溶劑萃取、
  結晶及燒成氧化鋁之過程。本實驗並研究低溫電解氯化鋁熔鹽製鋁之可行性。
  以下列條件浸漬可得最佳的氧化鋁抽出率（85.5％）︰?燒溫度700～900℃，?燒時閒2小時
  ，浸漬採用25％鹽酸，106～109℃的浸漬溫度及6小時的浸漬時間。
  溶劑萃取選用三丁基磷酸酯與煤油之混合液，由待萃取溶液之鐵離子濃度、酸度可選擇一組
  較佳的組合，使萃取效率達99％。所得氧化鋁之純度可合乎煉鋁工業之標準。
  鹽酸及三丁基磷酸酯的再生，使循環操作成本降低，循環操作過程中，鹽酸內之雜質堆積甚
  為緩慢。
  依本實驗之結果顯示，氯化鋁熔鹽（內含35 wt％氯化鈉）可在低溫（150℃）電解製鋁。只
  是在此低溫熔鹽電阻較大，電流密度較低。金屬鈦板為很好之陽極材料。
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• 英文摘要： The hydrochloric acid method was used inthis experiment to extract alumina from KinmenKaolinite. The experiments include hydrochloricacid leaching, solvent extraction, crystallization,and thermal decomposition. Besides, analuminum chloride molten salt bath was set upto study feasibility of producing aluminum elec-trically at low temperature. The best efficiency for alumina extraction(85.5%) was obtained by calcining the Kaoliniteat 700-900℃ for 2 hours, by using 25％hydro-chloric acid, and by leaching the Kaolinite at106-109℃ for 6 hours. A mixture of tributyl phosphate andkerosene was used for the solvent extraction toremove the iron ion in the leaching solution.The purity of alumina obtained subsequentlycan meet the standard of the aluminum industry. Because the hydrochloric acid and tributylphosphate used in this process can be re-generated, the cost of this method is lowerthan other processes. During repeating cyclicoperations, the impurities built-up in thehydrochloric acid and the tributyl phosphatewere very slow. The result shows that the aluminum chloridemolten salt (containing 35% NaCl) can beelectrolysed at low temperature to producealuminum. The only thing is that the resistivityof the molten salt is higher so that the currentdensity is lower. Titanium is a good materialfor the anode in this molten salt bath.
• 中文關鍵字： --
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