Aluminum sulfate solution, initial concentration

To develop an insightful understanding of the effect of the H2SO4 (sweep solution) concentration on aluminum transport, experiments were conducted at two different initial H2SO4 concentrations (Co), namely, 1 M and 2 M. Identical synthesized feed solutions of aluminum sulfate (-2000 mg/L as Al) were used in all four experiments that lasted for 24 h. Figure 34.26a and... 

The effect of aluminum ion combining with soluble silica was found by Goto (249) to be optimum at pH 8-9. To a solution initially containing 35 ppm Si(OH)<, aluminum ion was added as chloride or sulfate and then the pH raised to 8-9. Twenty ppm Al reduced the soluble silica to 15 ppm, 50 ppm reduced it to 5 ppm, and 100 ppm to about 3 ppm. When each molecule of precipitated silica is accompanied by one Al atom, then the molar concentrations of SiO and Al remaining in solution appear to be approximately related as follows ... 

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