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1. (WO2017060197) SINTERED SPHERES, PROCESS FOR THEIR PRODUCTION AND USE THEREOF

Pub. No.:    WO/2017/060197    International Application No.:    PCT/EP2016/073566
Publication Date: Fri Apr 14 01:59:59 CEST 2017 International Filing Date: Tue Oct 04 01:59:59 CEST 2016
IPC: C04B 33/132
C04B 35/626
C09K 8/80
Applicants: ZAAK TECHNOLOGIES GMBH
Inventors: KHAN, Abbas
Title: SINTERED SPHERES, PROCESS FOR THEIR PRODUCTION AND USE THEREOF
Abstract:
Described herein are sintered spheres, obtained from red mud, comprising at least aluminium oxide, iron oxides, silicon oxide, and titanium oxide, characterized in that the roundness and the sphericity of the sintered spheres is higher than 0.6. Described is further a process for the production of sintered spheres, comprising the following steps: a) providing red mud, being a residue from alumina production, b) optionally adjusting the pH value of the red mud to a value lower than 9, c) granulating the red mud from step b) under continuous drying, d) sintering the granulate from step c). Described herein is also the use of sintered spheres as proppant in fracking processes or as aggregate or lightweight fine aggregate (LWFA) for construction purposes or for geological solidification processes.