Height of the flights in the rotary drier is in the range of

$0\mathrm{.}08$ to $0\mathrm{.}12$ d

$0\mathrm{.}02$ to $0\mathrm{.}05$ d

$0\mathrm{.}2$ to $0\mathrm{.}5$ d

$0\mathrm{.}5$ to $0\mathrm{.}6$ d