作者：G. Palmer

作者单位：

刊名：refractories worldforum

ISSN：

出版年：2012-04-01

卷：

期：4

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语种：英文

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内容简介

The volatilization of silica (SiO2) from refractory concrete in steam-hydrogen environments has been studied extensively and reaction thermodynamics are also well published. This research has shown that silica volatilization occurs over a wide range of temperatures and that at temperatures less than 980°C the dominant species is Si(OH)4 and attemperatures above approximately 1000 °C the dom- inant species formed is SiO. By using a reaction kinetics approach it is shown that the rate of silica volatilization can be reasonably well calculated from refractory, used in industrial processes. Analysis of refractory samples from an ammonia transfer line shows that shows that the loss of silica occurs from the aggregate and not the matrix.