Projekter pr. år
Kaolinite rich clay particles calcined under certain conditions can attain favorable pozzolanic properties and can be used to substitute part of the CO2 intensive clinker in cement production. To better guide calcination of a clay material, a transient one-dimensional single particle model is developed, which fully addresses the conversion process of raw kaolinite particles suspended in hot gas. Particles are discretized into a number of spherical cells, on each of which mass, momentum, energy and species conservation equations are numerically solved by using the finite volume method. Reactions considered in the model include dehydration, dehydroxylation and various phase transformations. Thermogravimetric analysis is used to determine reaction kinetic data required as inputs in the model and to validate the model. Finally, model-based sensitivity analysis is performed, from which quantitative guidelines for calcination condition optimization are derived.
SCM: SCM - Manufacturing of highly reactive Supplementary Cementitious Materials for low-CO2 cement (The Danish National Advanced Technology Foundation, 095-2010-1)
01/08/2011 → 31/12/2014
Projekter: Projekt › Forskning
Gebremariam, A. T., Yin, C., Rosendahl, L., & Bøjer, M. (2014). Calcination of kaolinite clay particles for cement production: A modeling study. Cement and Concrete Research, 61-62, 11-19. https://doi.org/10.1016/j.cemconres.2014.04.002