Study on Essential Properties of Pyrophyllite and Manufacture of Pyrophyllite Refractory Xu PingkunThe chemical and mineral compositions and physical properties at high temperatures of nineteen kinds of pyrophyllites from four deposits have been investigated. The process technology of pyrophyllite refractory has been studied. Experiments were made to reach after the effect of zirconia, carbo- rundum and graphite reinforcement on pyrophyllite refractories.