... , talcum, barite, gypsum, dolomite, bentonite mud, mica, pyrophyllite, sepiolite, diatomite, graphite, alunite, fluorite, potassium feldspar, phosphorite, pigment and so on. The ... than twenty years' history, Zhengzhou Great Wall Heavy Industry Machinery Co.,Ltd. is a manufacture which specialized in R&D, manufacturing and ...