NaAlO2—CO2法制备拟薄水铝石规律的研究

研究ＮａＡｌＯ２－ＣＯ２法制备无三水氧化铝杂晶且Ｎａ＋含量较低的拟薄水铝石的规律。通过系统研究，解决了较高成胶温度下或较高ＮａＡｌＯ２溶液成胶浓度下生成三水氧化铝杂晶的问题；用ＮＨ４ＮＯ３或稀硝酸作洗涤介质，可有效地降低拟薄水铝石中Ｎａ＋含量；用循环洗涤方式降低洗涤介质用量；并探讨干燥温度影响拟薄水铝石胶溶性能的原因。

STUDIES ON PREPARATION OF PSEUDO BOEHMITE FROM NEUTRALIZATION OF NaAlO 2 AQUEOUS SOLUTION BY CO 2

Preparation for low sodium and aluminum trihydroxide free pseudo boehmite through neutralization of NaAlO 2 aqueous solution by CO 2 was investigated. Through systematic study, the formation of the trihydrate was prevented during neutralization at high concentration of NaAlO 2 solution or at higher temperature. NH 4NO 3 solution or dilute nitric acid was helpful to decrease the sodium content significantly in pseudo-boehmite. The quantity of washing medium consumption was greatly lowered by recycle operation mode. Finally, the effect of drying temperature on the peptizing properties was studied.