DEVELOPMENT OF A SELF-FORGE MIXTURE FOR FOUNDRY CORE WITH SODIUM SULFATE AND MOLASSES

Abstract

A self-setting mixture for foundry core with sodium silicate as hardener and sugar cane molasses as breakdown agents is studied. In order to achieve this, a full factorial experiment that uses relations of components (32) was designed. The responses variables used were the compression resistance after 24 hours and the demolding. It was selected a mixture of good properties for each of the different zones of relationship between the sodium sulfate and sodium silicate content. The study of the moisture sorption-desorption kinetics of these mixtures when they are located in environments between 60 and 90 % RH was carried out by using gravimetric techniques and the classical diffusion theory. Finally, the mixture that offers the best properties was selected and some technological recommendations for its use were offered.