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題 名 | Kinetics of the Precipitation of Aluminum Hydroxide by Carbonation Method=經由碳酸化法沈澱氫氣化鋁動力學之研究 |
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作 者 | 周更生; 田繼嚴; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷 期 | 18:3 1987.05[民76.05] |
頁 次 | 頁139-144 |
分類號 | 460.02 |
關鍵詞 | 沈澱; 動力學; 氫氣化鋁; 碳酸化法; |
語 文 | 英文(English) |
中文摘要 | 本研究旨在探討利用碳酸化法由鋁酸鈉溶液中製造氫氧化鋁動力學過程,在碳酸化法之第一階段內只有中和反應。然到達某臨界點後,氫氧化鋁開始沈澱,而溶液中鋁酸根離子亦隨之減少。在此批式過程之末端(即第三區域內),副產物碳酸鋁鈉因碳酸氫根離子之增加而大量生成。沈澱物中,bayerite與pesudoboehmite皆被發現。一般而言,後者多生於高臨界過飽和下,因此成核作用強烈,粒子數目多,但粒徑皆小。相反地,後者則發生於低的臨界過飽和情況下,所以成長作用較重要,故生成之粒徑較大。最後此二相之沈澱邊界可藉變數X或實驗之二操作變數,即二氧化碳吸收速率及起始鋁酸根離子濃度而加以界定。 |
英文摘要 | The kinetics of the carbonation methods for producing aluminum hydroxide from sodium aluminate solution was investigated in this study. In the first stage of this process, only neutralization occurs. However, after ac critical point, precipitation of aluminum hydroxide starts and the aluminate ion will decrease accordingly. Yet near the end of this batch process, sodium aluminocarbonate will become dominant due to the excessive presence of bicarbonate ions. Both bayerite and pseudoboehmite were observed in this work. Generally, pseudoboehmite occurs at high critical supersaturations which cause extensive nucleation and generate large numbers of fine particles. On the contrary, the formation of bayerite is favored at low critical supersaturations. Therefore crystal growth will be more important and its sizes larger. Finally, a precipitation boundary between these two phases is presented either in terms of a variable X or in terms of the two operating parameters. i.e., CO₂ absorption rate and initial aluminate concentration. |
本系統中英文摘要資訊取自各篇刊載內容。