Silico Manganese Ferro Silicon Manganese For Sale SiMn. The main requirements for raw materials in the production of silicomanganese are as follows: Silica, SiO 2 ≥97%, P 2 O 5 <002%, grain size 1040mm directly, not doped with soil and other sundries;; Coke: fixed carbon>84%, ash content <14%, small and medium electric furnaces use 313mm coke …