(中南大学 化学化工学院,湖南,长沙 410083)
摘 要: 在αk=1.40、温度75 ℃、Na2O浓度140 g/L、搅拌速度140 r/min、晶种添加量为80 g/L的实验条件下,研究五元杂环类添加剂用量和种类对铝酸钠溶液分解率、产品氢氧化铝表面形貌及晶型的影响。结果表明:随着添加剂分子杂环上羟基个数的增加,添加剂对铝酸钠溶液种分过程作用由明显的促进作用转变为抑制作用,产品氢氧化铝表面形貌变化显著,粒度逐渐减小,细化现象明显;但添加剂对铝酸钠溶液种分产品的晶型不产生影响,仅产品的结晶度发生微弱变化。
关键字: 核糖;四氢糠醇;四氢呋喃;铝酸钠溶液;种分过程
seeded precipitation of sodium aluminate solution
(School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China)
Abstract:Five-membered heterocycles additives were adopted as probe molecule in seeded precipitation process. The effect of the dosage and type of additives on the surface morphology of aluminum hydroxide and crystal was investigated under the conditions of initial αk=1.40, temperature 75 ℃, sodium hydroxide concentration 160 g/L, agitate speed 140 r/min and the quantity of crystal seed 80 g/L. The results indicate that the effect of additives changes from promoting effect to inhibitory effect, the surface morphology of aluminum hydroxide changes significantly when the number of hydroxyl increases, and the particle size decreases gradually. But the crystal shows no change, only the crystallinity of aluminum hydroxide changes weakly.
Key words: ribose; tetrahydrofurfural alcohol; tetrahydrofuran; sodium aluminate solution; seeded precipitation