Rare earth magnesium ferrosilicon is a good ball agent,also used in the production ... of steel, Iron as additives, alloying agent. Rare earth magnesium ferrosilicon is a good ball agent, their mechanical strength Degree, deoxidation ... in the production of steel, Iron as additives, alloying agent. Ferrosilicon, plywood, metal magnesium is the production of rare earth-Mg ...