摘要
研究添加联氨和过氧化氢时人工合成铝酸钠溶液中氢氧化铝的结晶行为。添加少量联氨会对氢氧化铝的结晶产生影响,如需获得相同的效果,过氧化氢的用量更多。X射线衍射分析表明生成产物为三水铝石。扫描电镜观察表明,添加联氨时产物为团聚状,而添加过氧化氢时产物为细小弥散颗粒。对有联氨和过氧化氢时存在的结晶机理进行了讨论。
Aluminium hydroxide precipitation from synthetic sodium aluminate solution was studied in the presence of hydrazine or hydrogen peroxide. The addition of low concentration of hydrazine is found to be effective, while higher amount of hydrogen peroxide is required to generate similar effect. XRD data confirm the product phase to be gibbsitic by nature. The scanning electron micrographs （SEM） show that agglomerated products form in the presence of hydrazine while fine discrete particles are produced with hydrogen peroxide. The probable mechanism of precipitation in the presence of hydrazine and hydrogen peroxide is also discussed.
基金
M/s NALCO, Bhubaneswar for the partial financial support to carry out this work
关键词
氢氧化铝
联氨
过氧化氢
铝酸钠
结晶
aluminium hydroxide
hydrazine
hydrogen peroxide
sodium aluminate
precipitation
