Reactivity of SiO2 fume from ferrosilicon production with Ca(OH)2 under hydrothermal conditions
✍ Scribed by B. Kurbus; F. Bakula; R. Gabrovšek
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 409 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0008-8846
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✦ Synopsis
Reactivity has been studied of SiO 2 fume from ferrosilicon production with Ca(OH) 2 in suspension, with stirring, under hydrothermal conditions at 190°C and 200°C from 1 to 12 hours. Reaction product after a 4-hour synthesis at 200°C is calcium silicate hydrate xonotlite C6S6 H*, with some C-S-H(1) phase. When glass fibers were added to the slurry, which was subsequently filtered, pressed, and dried, the product thus obtained was lightweight thermal insulation material, temperatureresistant up to 800°C and usable up to IO00°C. The product has excellent insulation properties with thermal conductivity 0.042 -0.081W/mK at bulk densities 150 -500 kg/m3.