(中南大學(xué) 化學(xué)化工學(xué)院，長(zhǎng)沙 410083)
摘 要: 分別研究甲酸、乙酸和丙酸與硅酸的共同作用對(duì)鋁酸鈉溶液種分過(guò)程的影響。結(jié)果表明：這3種小分子一元酸與硅酸共同存在時(shí)均能對(duì)鋁酸鈉溶液的分解產(chǎn)生抑制作用，且溫度越低，對(duì)鋁酸鈉溶液分解的抑制作用越強(qiáng)。3種一元酸與硅共同存在時(shí)均能使種分過(guò)程出現(xiàn)成核現(xiàn)象，細(xì)化產(chǎn)品氫氧化鋁，細(xì)化作用介于單一硅酸的細(xì)化作用與單一一元酸的細(xì)化作用。
關(guān)鍵字: 鋁酸鈉溶液；一元酸雜質(zhì)；硅；分解率；粒度分布
seeded precipitation of sodium aluminate solutions
（School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:The effects of formic acid, acetic acid, propionic acid with silicon dioxide on decomposition ratio of sodium aluminate solutions and particle size distribution(PSD) of gibbsite were investigated respectively. The results show that the coexistence between the three carboxylic acids and silicon dioxide all have inhibitory effects on the precipitation, and the lower the temperature is, the stronger the inhibitory action. The second nucleation happens and the particle size of gibbsite product is decreased when the three carboxylic acids exist with silicon dioxide respectively, and the decreasing extent is between that with silicon dioxide and that with carboxylic acid separetely.
Key words: sodium aluminate solution；carboxylic acids; silicon dioxide; decomposition rate; particle size distribution
