Possibility of applying pyrophylite as filler in refractory coatings

Abstract

The paper investigates the procedures for the preparation of fillers based on pyrophyllite for obtaining refractory coatings with controlled rheological properties. Starting samples of pyrophyllite were obtained from the Parsović-B&H deposit. The influence of the micronizing ginding process on the change in the properties of the refractory filler, the change in the size and shape of filler grain, the dispersion and stability of the coating suspension was investigation. To characterize the obtained fillers XRD, SEM and optical microscopy were used. In the second phase of the research, the fillers were subjected to the process of micronizing grinding in the mill with ceramic balls. The upper limit of the size of the input material was 100% -2,00 mm. Micronizing grinding time (min): 15; 20; 25. The aim was to optimize the properties of fillers based on pyrophyllite, to define the composition of coatings and the procedures for their production. The quality of the obtained coatings was controlled in accordance with the standard for this type of refractory products.