Preparation and Ion-Exchange Properties of Hydrotalcite-like Compounds Using MgSO4 Solution Obtained from H2SO4-dissolution of Serpentinite

• Published in: Shigen to sozai Vol. 108; no. 10; pp. 743 - 746
• Main Authors: KOSUGE, Katsunori, SHIMADA, Koji, TSUNASHIMA, Atsumu, OTSUKA, Ryohei
• Format: Journal Article
• Language: Japanese; English
• Published: The Mining and Materials Processing Institute of Japan 1992
• Subjects: H2SO4-dissolution; Hydrotalcite-like Compound; Ion-exchange; Serpentinite
• ISSN: 0916-1740; 1880-6244
• DOI: 10.2473/shigentosozai.108.743

In order to investigate a useful application of serpentinite, hydrotalcite-like compounds [Mgl-x Alx (OH) 2] x+ [SO4x/2· m H2O] x- were prepared using magnesium sulfate solution obtained from H2SO4-dissolution of the ore. The compounds with 0.16≤x≤0.33 were formed as a single phase by coprecipitation method at room temperature. Each recovery of Mg and Al from the starting materials was above 90% for the compounds with 0.22≤x≤0.33. To study the ion-exchange of SO42- for CO32-, the compound with x=0.25 was treated in 0.005-0.1 mol/l Na2CO3 solution at room temperature and 50°C for 4 hours. The amount of CO32- in the compound reached 90% at room temperature and 95% at 50°C in 0.1 mol/l Na2CO3 solution, respectively.