Abstract
The effect of char porosity on the strength-porosity relation of coal/char hot-briquettes has been investigated. Six different char and coke samples are characterized with respect to pore-size and pore size distributions, using mercury porosimetry and SEM. An empirical correlation between the ultimate compressive strength ( U) and total porosity ( p) shows that Ryshkewitch's expression U = U oe − ap is obeyed. The porosity coefficient ‘a’ is sensitive to interfacial bonding and decreasing values are indicative of penetration of the binder phase into the pores of the chars. The ability of a binder phase to penetrate very small size (submicron) pores of certain types of char appears to be a contributing factor in the strength in the hot-briquetted composites.
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