Solubility and Density of Hydrated Aluminas in NaOH Solutions

Precipitation from supersaturated aluminate solutions. II. Role of temperature

“…9 we have plotted log tr versus log × II~bbsite. The supersaturations with respect to gibbsite were calculated from published data by different investigators (9)(10)(11)(12). The results of some experiments at 62.5 and 90°C are also included in this figure.…”

“…~1/3 for 3D nucleation [9] where 3 and ~ are the respective slopes of the plots of In tr vs (ln 11)-1 and In tr vs (ln 1I) -2 (see Fig. 10).…”

“…From Eq. [9] we then deduce that ~* = ~" v 2/~. [10] In order to derive values for ~* and In × rb(T) the solubility products (Ksv) of the various phases must be known.…”

Thermodynamic Modeling of the SRS Evaporators: Part II. The 3H System

“…The solubility data of Russell 47 for Al(OH) 3 was used in the modeling of the SRS 3H Evaporator rather than the Al(OH) 3 data in GWB. The position of the stability field boundary between gibbsite and NAS changes very little when the solubility data in GWB is used (see dashed lines in Figure 8a) instead of the Russell 47 data which was obtained from solutions at 8.5 molal Na at 25°C.…”

“…3 and AlOOH solubility in GWB is substituted for the 8.5M Russell 47 data for these species. For completeness, the activity diagram for Tank 30 at 25°C (Figure 11) was generated.…”