公开(公告)号：US20230110412A1

公开(公告)日：2023-04-13

申请号：US17793987

申请日：2021-01-13

Applicant: BASF SE

Inventor： Gerhard OLBERT ,  Laila Raquel PASIN E MATOS ,  Ekaterina HELWIG

IPC: C03B19/10 ,  C03C11/00 ,  C03C3/062 ,  C03C3/083

Abstract: Process for the preparation of hollow spherical glass particles comprising at least SiO2, Al2O3, and an alkali metal oxide, wherein the process comprises the preparation of precursor particles comprising at least SiO2, Al2O3, and an alkali metal oxide by mixing the starting materials, slurrying the starting materials with water followed by spry-drying and heat-treating the obtained precursor-particles at a temperature from 1000° C. to 1800° C., preferably from 1300° C. to 1600° C. by contacting the precursor particles with at least one naked flame.