K. Kato et al., Study for recycling of ceria-based glass polishing powder II-recovery of hydroxysodalite from the alkali waste solution containing SiO2 and Al2O3, IND ENG RES, 39(11), 2000, pp. 4148-4151
The recovery of SiO2 and Al2O3 from the alkali waste solution of the glass
polishing powder-recycling process was investigated. The effects of seed cr
ystal, stirring speed, and temperature were also studied. Hydroxysodalite w
as obtained from the waste solution by heating to 80-100 degreesC. Addition
of seed crystal shortened the reaction time and made easy the recovery of
hydroxysodalite. The hydroxysodalite deposition process was rate-determined
by the chemical reaction step, and increased temperature was also effectiv
e in shortening a reaction time.