US 12,325,640 B2
Sequestering of crystalline silicon dioxide
Jörg Ulrich Zilles, Cologne (DE); Max Kellermann, Wesseling (DE); and Paul Páez-Maletz, Frenchen (DE)
Assigned to QUARZWERKE GmbH, Frenchen (DE)
Appl. No. 17/426,461
Filed by QUARZWERKE GmbH, Frenchen (DE)
PCT Filed Jan. 30, 2020, PCT No. PCT/EP2020/052286
§ 371(c)(1), (2) Date Jul. 28, 2021,
PCT Pub. No. WO2020/157193, PCT Pub. Date Aug. 6, 2020.
Claims priority of application No. 19154567 (EP), filed on Jan. 30, 2019; and application No. 19172386 (EP), filed on May 2, 2019.
Prior Publication US 2022/0162080 A1, May 26, 2022
Int. Cl. C01B 33/18 (2006.01)
CPC C01B 33/18 (2013.01) [C01P 2004/51 (2013.01); C01P 2004/61 (2013.01); C01P 2004/62 (2013.01); C01P 2006/80 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A process for treating crystalline silicon dioxide to reduce risk of silicosis from inhalation, comprising the step of grinding a crystalline silicon dioxide together with from 0.05 to 1.00% by weight of a substance selected from the group consisting of glycerol, kaolin, aluminum alcoholates, and mixtures thereof, wherein said crystalline silicon dioxide has a d50 grain size within a range of from 0.2 to 90 μm after grinding.