The bond work index of mixtures of ceramic raw materials

The Bond method of grindability was applied to ceramic raw materials (quartz, kaolin and feldspar) and to their binary and ternary mixtures. The Bond work indices of the admixtures containing a softer component (kaolin) were found to be greater than the weighted average of the work indices of the individual components in the mixture. As a result, separate grinding of ceramic raw materials seems to require less specific energy input than grinding them in admixtures.