Talc powder samples were ground by three types of ball mill with different
sample loadings, W. to investigate rate constants or the size reduction and
structural change into the amorphous state. Ball mill simulation based on
the particle element method was performed to calculate the impact energy of
the balls. E-i,E- during grinding. Each rate constant correlated with the
specific impact energy defined by E-i/W on logarithmic coordinates with a h
igh correlation factor.