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El objetivo de esta investigación ha sido analizar la valorizaciónde un residuo generado en el proceso de producciónde dióxido de titanio (vía sulfato), denominadoyeso rojo, en la producción de cementos. Dicho residuoestá compuesto fundamentalmente por sulfato de calciodi-hidratado e hidróxidos de hierro. Para ello, ha sido necesariala caracterización físico-química del yeso rojo,así como la de los otros componentes fundamentales enla fabricación de cementos y de los cementos generadoscon el mencionado residuo. Además, en el caso del yesorojo, se ha analizado su contenido radiactivo al generarseéste en una industria NORM (Natural Occurring RadioactiveMaterials).Posteriormente, se han estudiado las propiedades másimportantes de los cementos producidos con diferentesporcentajes de yeso rojo añadido, comparando estasmezclas con las propiedades de un cemento Portlandcomercial, comprobándose que se cumplen todas lasnormas europeas de calidad exigibles.The main objective of this research has been thevalorisation of a waste from the TiO2 production process(sulphate method), called red gypsum, in the productionof cements. This waste is mainly formed by di-hydratecalcium sulphate and iron hydroxides. To cover thisobjective it has been necessary to perform the physicochemicalcharacterisation of the red gypsum as well asthe main components in the production of cements andof the new cements generated. Moreover, for the redgypsum, has been analyzed its radioactive contentbecause it is generated in a NORM (Naturally OccurringRadioactive Materials) industry.Finally, the most important properties of the obtainedcements with different proportions of red gypsum in theircomposition have been studied by comparing them withthe standard ones obtained in a Portland cement. Lastly,we have demonstrated that the new cements fulfil all thequality tests imposed by the European legislation.This work has been supported by the PROFIT Project “Valorization of red gypsum from the industrial production of titanium dioxide” (CIT-310200-2007-47)

Uso del residuo industrial “yeso rojo” como sustituto del yeso natural para la fabricación de cementos comerciales