Mg^<2+>イオンを含む溶液中でのα-アルミナの溶出挙動

概要

論文の詳細を見る
Dissolution behavior of high-purity α-alumina particles was studied in acidic solutions (pH 2.6-5.5) and basic solutions (pH 7.2-9.3) containing Mg^<2+> ions at room temperature. The amount of dissolved α-alumina was dominated by the solubility limit of aluminium hydroxide formed on the surface of α-alumina. The α-alumina in an acidic suspension of 5 vol% solids dissolved to increase pH of the suspension and to produce a supersaturated solution of Al^6lt;3+> ions in which nucleation and growth of aluminium hydroxide proceeded until the Al^<3+> concentration reached the solubility limit of aluminium hydroxide. Little adsorption of Mg^<2+> ions onto the positively charged alumina surface (<0.5μmol/m^2) was examined in the acidic suspensions at pH 4.1-4.3. The amount of alumina dissolved in the basic suspensions was less than that in the acidic solutions. Weakly charged negative alumina surface of 1 m^2 in the basic suspension at pH 7.9 adsorbed Mg^<2+> ions of 1.9μmol.
社団法人日本セラミックス協会の論文
1995-08-01