foerfarande foer at haerda that material avsett saerskilt foer framstaellning av gjutkaernor och - formar samt foer at framstaella eldbestaendiga produkter och slip - samt byggnadsmaterial

摘要

The invention has for its object a method for the hardening of a composition particularly intended for making foundry cores and moulds including the known steps of gasifying this composition by SO2 and the introduction into the composition of an agent for oxidizing SO2 characterized in that the SO2 is insufflated diluted with another gas of lower diffusibility.