Effects of Addition of Polyacrylic Ammonium on Dissolution of α-Alumina in Solutions Containing Mg<sup>2+</sup> Ions

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  • SAMESHIMA Soichiro
    Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University
  • ARIMURA Yuichi
    Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University
  • HIRATA Yoshihiro
    Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Kagoshima University

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  • Mg<sup>2+</sup>イオンを含む溶液中でのα-アルミナの溶出に及ぼすポリアクリル酸アンモニウムの添加効果
  • Effects of Addition of Polyacrylic Ammo

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Abstract

Dissolution behavior of high purity α-alumina particles and adsorption of Mg2+ ions onto α-alumina surface were studied in 5vol% solid suspensions containing polyacrylic ammonium (PAA). The amount of alumina dissolved was higher in acidic suspensions than in neutral or basic suspensions. The solubility of alumina in the wide pH range from 2.5 to 9.3 decreased with the addition of PAA. The amount of Mg2+ ions adsorbed onto alumina surface depended on two factors of pH and PAA content of suspensions. Negatively charged alumina surface in the pH range from 7.6 to 9.3 adsorbed Mg2+ ions of 17.5μmol/m2-alumina surface. Positively charged alumina surface adsorbed little Mg2+ ions in acidic suspensions. The amount of Mg2+ ions adsorbed onto alumina surface increased in acidic or neutral suspensions and decreased in basic suspensions by addition of PAA.

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