Boron containing precipitated silica

US4289681A · kind A · utility

Assignee

• Deutsche Gold- und Silber-Scheideanstalt Vormals Roessler

Inventors

• Peter Nauroth · Wesseling, DE
• Robert Kuhlmann · Lechenich, DE
• Gunter Turk · Hanau, DE

Key dates

• Filing date: Jun 28, 1979
• Grant date: Sep 15, 1981
• Expiry date: Jun 28, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/10
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

There is prepared precipitated silica containing boron and having the following physical-chemical data ______________________________________ Loss on heating Weight % 14-40 pH 4-6 Conductivity in 4% aqueous /.mu.S <800 dispersion Bulk density g/l 130 .+-. 100 Sieve residue according to Alpine >63/.mu. Weight % <0.1 SiO.sub.2 content based on original Weight % 9-76 material B.sub.2 O.sub.3 content based on original Weight % 10-51 material Na.sub.2 O content based on original Weight % <0.5 material So.sub.3 content based on original Weight % <0.8 material ______________________________________ The product is obtained by supplying precipitated silica and ortho boric acid in the ratio of 0.1-3.5:1 continuously to a jet mill and micronizing them together by means of the air of the mill at room temperature.