Ferro Silicon is added in the molten hot metal tapped from Blast furnace to convert from Steel grade to Foundry Grade quality. During the process, the yield of Ferro Silicon is only 85% max and the remaining 15% goes into the slag which is resulting in increased cost of production.
The process of converting Steel Grade Pig Iron into Pig Iron to be used in Foundry involves adding Ferro Silicon in large quantities after melting. Currently the Ferro Silicon is not mixed & melted properly to attain the desired chemistry. As a result we have to add more ferro silicon to attain the desired chemistry of hot metal which results in increased cost of production. Improvement in recovery will help us to optimize our Ferro silicon consumption and reduce cost.