Process for the preparation of alumino-silicate granulates

US4249903A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Heinz Smolka · Langenfeld, DE
• Edgar Koppelmann · Hilden, DE

Key dates

• Filing date: Jun 27, 1979
• Grant date: Feb 10, 1981
• Expiry date: Jun 27, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B39/026
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of a cation-exchanging alkali metal aluminosilicate granulate having a particle size of from 0.05 to 1 mm comprising (a) charging a finely-divided, crystalline water-containing alkali metal aluminosilicate powder having a calcium binding power of from 50 to 200 mg CaO/gm of anhydrous aluminosilicate and a particle size of less than 30.mu. into a conventional granulator, (b) adding thereto (i) m moles of SiO.sub.2 as an aqueous alkali metal silicate solution or an aqueous silicic acid sol, and (ii) n mols of Al.sub.2 O.sub.3 as an acidic hydrolyzing aluminum salt and/or alkali metal aluminate powder and/or an aqueous alkali metal aluminate solution, (c) mixing until the moisture is uniformly absorbed and a granulate with a particle size of 0.05 to 1 mm is formed, and (d) drying said granulate at 80.degree. to 150.degree. C.