Method and composition for the desulfurization of molten metals
AssigneeSuddeutsche Kalkstickstoff-Werke Aktiengesellschaft
InventorsWalter Meichsner, Heinrich Rock, Alfred Freissmuth, Horst Prietzel, Heinrich Rellermeyer, Wolfgang Ullrich, Erich Pfluger, Raymund Sindermann
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Abstract
Molten metals, especially molten pig iron, are desulfurized by contacting them with a composition comprising calcium carbide or calcium cyanamide and an additive agent yielding water or hydrogen at the temperature of the molten metal; preferred as the additive agents are the alkali metal hydrides, polyethylene or polyamide for yielding hydrogen and hydrate of lime and alkaline earth borates for yielding water.
Claims18
Solid composition for the desulfurization of molten metals consisting essentially of at least one of calcium carbide and calcium cyanamide as the desulfurizing agent present in an amount of at least 30% by weight, and, in addition, an additive agent which yields at least one of hydrogen and water at the temperature of the molten metal being treated thereby forming a reducing atmosphere for the desulfurization.
A process for desulfurizing molten pig iron comprising introducing a mixture of calcium carbide and a solid material selected from the group consisting of polyethylene, in a carrier gas, to the molten pig iron.
Dependencies are inferred from the claim text.