Formation of Gibbsite from Aging Hydroxy-Aluminum Solutions1
- Pa Ho Hsu2
Hydroxy-aluminum solutions of NaOH/AlCl3 molar ratio = 0.3 to 2.7 and concentration of Al = 0.02
It is proposed that the formation of gibbsite from aging hydroxy-aluminum solutions follows the same mechanism as the rapid precipitation of bayerite at NaOH/AlCl3 = 3 in an alkaline medium, the latter being discussed previously by Hsu and Bates in 1964. The difference between these two processes is the source of OH- for the completion of neutralization. The OH- added as NaOH is taken up by hydroxy-aluminum polymers almost instantaneously, whereas the spontaneous hydrolysis of these polymers is slow, particularly in the presence of high salt concentration.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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