Potassium feldspar is an important non-metallic raw material, rich in potassium feldspar raw material, and often the Fe2O3 content in potassium feldspar exceeds the standard, which seriously affects the effective development and utilization of potassium feldspar. When potassium feldspar powder is used as a glaze, it sometimes forms black spots on the surface of porcelain, even with its low iron content. The quality of dry PTMS Electromagnetic Separator-powder plays an important role.