Investigation of compressibility and Foaming behavior of steel slag /waste glass composites by changing particle size distribution

In the present investigation, the foam like composites, fabricated by window glass (۵۰ wt-%), steel slag (۵۰wt-%) and different foaming agents (carbonates, carbon, SiC) were considered by press-sintering method (۵۰-۱۰۰ MPa pressing pressure and ۱۲۰۰°C sintering temperature). The effect of particle size distribution (different ranges from ۴۵ m to ۱۵۰ m) on green and fired density of resulting glass-ceramics was evaluated. Six mixes of different particle size distribution for slag powder and slag/glass powders were designated. It was shown that by using medium fine grade of the slag powder (average particle size under ۱۰۰-۱۲۰ P), the compaction and the green densities of samples were ۱۶% increased while in the case of slag/glass composites due to the high hardness of glass powder, the compaction of composite was ۱۱% increased. For finer distributions (average particle size ۵۰-۷۰ P) the compressibility has decreased rather than medium samples because of short range of distribution. That was in the opposite in case of fired density of different particle sizes. It was observed that using finer particle sizes in the case of CaCO۳ foaming agent, the density varied from ۰.۸۰ gr/cm۳ to ۰.۴۳ gr/cm۳ while in the case of SiC it changes from ۰.۸۰ to ۰.۵۱. probably in the case CaCO۳ as foaming agent faster coalescence process and gases trapping from decomposition has been occurred.