Effects of Na4EDTA and EDTA on seeded precipitation of sodium aluminate solution
来源期刊:中国有色金属学报(英文版)2010年增刊第1期
论文作者:吕保林 陈启元 尹周澜 胡慧萍
文章页码:37 - 41
Key words:sodium aluminate solution; seeded precipitation rate; Na4EDTA; EDTA; interaction mechanism
Abstract: Na4EDTA and EDTA were adopted as new additives to intensify the seeded precipitation process of sodium aluminate solution. The effects of the two additives at certain concentrations on the seeded precipitation rate of sodium aluminate solution, particle size distribution (PSD) and morphology of precipitated gibbsite were investigated using titration method, particle size analyzer and scanning electron microscope (SEM), respectively. The results show that the two additives can accelerate the seeded precipitation rate of sodium aluminate solution. At relatively high concentration, the facilitative effect of EDTA on sodium aluminate solution is more obvious than that of Na4EDTA. EDTA makes gibbsite particles thinner than Na4EDTA. The Na+ and H+ result in the different effects on the seeded precipitation rate of sodium aluminate solution in spite of the same EDTA anion in the two additives.
基金信息:by the National Natural Science Foundation of China
the National Basic Research Program of China