Abstract

BORRAJO-PEREZ, Rubén; GONZALEZ-BAYON, Juan José  and  SANCHEZ-RODRIGUEZ, Andy. Modeling of the flash calcination process during clay activation. Ingeniería Mecánica [online]. 2012, vol.15, n.1, pp. 73-82. ISSN 1815-5944.

Puzzolanic activity in some materials can be increased by means of different processes, among them, thermal activation is one of the most promising. In the last few years, thermal activation processes have been used to produce puzzolans with high reactivity in early ages of concrete. Temperature is an important parameter in the activation process, and as a consequence, different temperatures are required for each raw materials. Taking into account the high prices of Metakaolin, new puzzolanic materials are constantly investigated. Other materials, with higher levels of kaolin are being used for activation with good results. This paper is about the modeling of thermal, hydrodynamics and dehydroxilation processes undergone by particles exposed to a hot gas stream. The models employed are discussed; the velocity and temperature of particles are obtained as a function of the gas parameters. The calculation includes the heat losses and the model predicts the residence time of a particle in an activation unit.

Keywords : puzzolan; flash; calcinations; modeling.

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