The solubility data were obtained from more than 200 raw green liquor (GL) samples and ∼30 raw white liquor (WL) samples at 95 °C. The effects of time, as well as the concentrations of AlCl 3 ·6H 2 O, Na 2 SiO 3 ·9H 2 O, CaO, TiO 2, MgSO 4 ·7H 2 O, 4MgCO 3 ·Mg(OH) 2 ·4H 2 O, powdered magnesium metal, KCl, K 2 CO 3, and stainless steel coupons on the solubilities of silicon and aluminum in unclarified mill GL were investigated. A series of runs was performed to compare silicon and aluminum solubilities in GL with those in WL. The addition of magnesium sulfate to GL solutions expedited the formation of Al−Si precipitates. Pitzer's theory was applied to these solubility data, and equilibrium constants were determined for possible aluminosilicate precipitates, ranging from log K = 34.2 for the formation of hydroxyl sodalite (which has the formula (NaAlSiO 4 )·2(NaOH)·2H 2 O) to log K = 39.0 for the formation of natrodavyne (which has the formula (NaAlSiO 4 )·(K 2 SO 4 )·3H 2 O).
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Wannenmacher et al. (2005) studied this question.
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