Geopolymerization of a silica residue from waste treatment of chlorosilane production

• Published in: Materials and structures Vol. 46; no. 8; pp. 1291 - 1298
• Main Authors: Gluth, G. J. G., Lehmann, C., Rübner, K., Kühne, H.-C.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01-08-2013; Springer; Springer Nature B.V
• Subjects: Applied sciences; Building construction; Building Materials; Buildings. Public works; Chlorosilanes; Civil Engineering; Curing; Engineering; Exact sciences and technology; Machines; Manufacturing; Materials; Materials Science; Original Article; Plastics; Pollution; Processes; Reaction products; Recovery materials; Residues; Silicon dioxide; Solid Mechanics; Strength; Theoretical and Applied Mechanics; Waste treatment; Wastes; Zeolites; Zeolite A; One-part formulation; Geopolymers; Silica; Scanning electron microscopy; Chlorine; Waste treatment; Reaction product; Construction materials; Zeolite; X ray diffraction; Inorganic polymer; Residue; Formulation; Strength
• ISSN: 1359-5997; 1871-6873
• DOI: 10.1617/s11527-012-9972-5

A silica residue from waste treatment of chlorosilane production was used together with solid sodium aluminate to test its applicability for the production of one-part geopolymers. The blend was activated with water and cured at 70 °C. The degree of reaction and strength were determined after 1, 3, and 7 days. The reaction products were analyzed by XRD and SEM/EDX. Until the third day of curing the degree of reaction of the residue reached 51 % and the strength was 8.9 MPa. The reaction product was identified as geopolymer containing zeolite A. Thus, the results confirmed that the residue may be used in the production of geopolymers. However, after 3 days of curing no further progress of reaction was observed and the strength slightly decreased, which was attributed to changes in the structure of the geopolymeric gel. It was further observed that even harsh vacuum drying left some water (presumably zeolitic water and surface hydroxyl groups) in the geopolymer.