The particle size effect upon the foam-formation, the Crystallization and the sulfide sulfur loss in slag(55w/o) -quartz (37 w/o) -$Na_2O$ (8 w/o) batch system was studied. Foams in batcehs were made by firing the batch-mixtures in range of 1155℃~1200℃, and the crystallization at various temperature were investigated by the measures of optical microscope and X-ray diffraction analysis. And the sulfide loss in slag was also studied by the $KIO_3$ titration method.
The results showed that slag particle size influenced the foam-formation and the smaller slag particles reduced overall porosity in fired body. This is due to the more rapid sulfide loss in the smaller slag particle than in the larger during the early stage of firing. Wallastonite was rystallized from glassy melt during firing the batches, and the batches with the smaller slag particles resulted in the more rapid crystallization than those with the larger.
