Magnetite ore processing efficientn tin ore refining machine wet process high intensity roller magnetic separator with 15000 gauss for tin separation magnetic separator is widely used for separation of iron magnetite hematite ilmenite manganese ore chromite ore tin ore wolframite ore coltan oreect.2 97 Taconite Ore Processing 11.23-5 Crude ores in which most of the recoverable iron is magnetite (or, in rare cases, maghemite) are normally concentrated by magnetic separation. The crude ore may contain 30 to 35 percent total iron by assay, but theoretically only about 75 percent of this is recoverable magnetite. The remaining iron is.