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Articles • Cerâmica 61 (359) • Sept 2015 • https://doi.org/10.1590/0366-69132015613601897   copy

Silica gel obtained from blast furnace slag: Marabá, PA, Brazil

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Abstract

Silica gel with similar properties to commercial silica was obtained from blast furnace slag (EAF) using digestion with hydrochloric acid. The EAF-silica was obtained and characterized by different techniques. The results showed that the EAF-silica obtained was amorphous, with 99.7% purity and specific area 282 m2/g. It presented high hydrophilic character (12.27%), with constitution water of ~ 6.18%, which was confirmed by mass loss in thermogravimetric analysis. The EAF-silica particles had micrometric sizes (< 1 µm) with aggregates, unimodal size distribution and D50 7.0 µm.

Keywords:
blast furnace slag; silica gel; syntheses

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