Process for preparing granular sodium silicates

US5520860A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Alexander Tapper · Mönchengladbach, DE
• Gunther Schimmel · Lechenich, DE
• Hans-Peter Rieck · Hofheim, DE
• Gerhard Noltner · Frankfurt am Main, DE

Key dates

• Filing date: Aug 29, 1994
• Grant date: May 28, 1996
• Expiry date: Aug 29, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D17/0039
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

To prepare a compacted, granular sodium silicate having an SiO.sub.2 /Na.sub.2 O molar ratio of 1.7:1 to 4.1:1, sodium silicate having a median particle diameter of <500 .mu.m is first mixed with a material increasing its hardness before being converted into pressed granules having particle sizes of 0.1 to 5 mm by compacting, comminution and screening.