(東北大學 有色冶金系， 沈陽 110006)
摘 要: 用水溶液滴定法對Al(OH)3晶種的表面酸性進行了預(yù)測定，并用非水溶液回滴法進行了準確測量，確定了晶種表面的酸量，同時研究了不同粒度的晶種對分解過程的影響。實驗結(jié)果表明，在相同質(zhì)量下，細粒子的表面酸量較粗顆粒大；當表面積相同時，粗顆粒的單位表面酸量較細顆粒的大。探討了晶種粒度對分解過程的影響，相同種子比條件下，細粒子具有較高的分解速度和深度。
關(guān)鍵字: 氫氧化鋁晶種； 表面酸性；鋁酸鈉溶液
（Department of nonferrous metallurgy, Northeastern University, Shenyang 110006）
Abstract:The theory of catalysis was applied to precipitation process of sodium aluminate liquor, and the reaction was regarded as a selfcatalyze reaction, gibbsite seed was acted as catalyzer, therefore, the acid and base on its surface will affect its activity directly. In order to decide the acid intensity on seed surface, the acid was premeasured by aqueous titration firstly, then measured exactly by nonaqueous titration method, on the same time, the effect of seed with different particle sizes on precipitation was researched. The result is that the surface acidity of coarse particle is bigger than that of the fine on the condition of the same surface area. As a result, the effect of seed particle size on the precipitation is illustrated.
Key words: aluminum hydroxide seeds; surface acidity; sodium aluminate liquor
