超細氫氧化鋁的影響
(中南大學(xué) 化學(xué)化工學(xué)院，長沙 410083)
摘 要: 研究在鋁酸鈉溶液離子膜電解制備超細氫氧化鋁過程中，添加劑聚乙二醇對產(chǎn)品的影響。結(jié)果表明：聚乙二醇能有效抑制氫氧化鋁顆粒間的附聚，相對分子質(zhì)量較高的聚乙二醇(PEG 4 000)的作用效果更好，最佳添加濃度為0.175 g/L。掃描電鏡照片顯示，聚乙二醇對氫氧化鋁的形貌有一定程度的影響。X射線衍射分析表明，離子膜電解種分的產(chǎn)品為拜耳型氫氧化鋁。
關(guān)鍵字: 離子膜電解；超細氫氧化鋁；鋁酸鈉；添加劑
（School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:The influence of polyethylene glycol on the aluminum hydroxide product in the process of ion-exchange membrane electrolysis was studied. The results show that the agglomeration among aluminum hydroxide particles could be effectively inhibited by polyethylene glycol. The higher the relative molecular mass of additives, the better the effectiveness. And the optimal concentration of the additive is 0.175 g/L. The SEM images of aluminum hydroxide show that polyethylene glycol could affect the morphology of aluminum hydroxide. The product of ion-exchange membrane electrolysis from Bayer liquor is Bayerite according to the pattern of X-ray diffraction.
Key words: ion-exchange membrane electrolysis; superfine aluminum hydroxide; sodium aluminate; additive
