powdered ferro silicon is a magnetic ferro silicon produced in electric arc furnaces and subsequently milled to size ranges required. in addition, powdered ferro silicon contains aluminum and titanium which enhances its resistance to corrosion. 　applications: 　powdered ferro silicon is used in slurry density applications for heavy media separation and sink-float processes. powdered ferro silicon is an accepted medium for the gravity separation of minerals, aggregates and metals with a specific gravity of approximately 2.0 to 4.0.