Gfe Gesellschaft Fur Elektrometallurgie MIT Beschrankter Haftung

Gesellschaft Fur Elektrometallurgie Mbh

Fritz Stadler

Karl Brotzmann

Rudolf Fichte

Friedrich Breuer

Gunter Duderstadt

The invention relates to a method of rapidly decarburizing a high-carbon ro-alloy with oxygen for avoiding an undesirable oxidation of the principal alloying elements, especially chromium or manganese, comprising blowing an oxidizing gas under the surface of a bath of molten ferro-alloy from one or more gas-jacketed nozzles in an amount ranging between substantially 3 and 15 m.sup.3 S.T.P. per metric ton of ferro-alloy with reduction of the carbon content of the ferro-alloy at a rate of about 0.2% to 1%. Comminuted solids, especially particles of oxides of alkaline-earth metals such as powdered lime, may be admixed with the oxidizing gas to prevent the ejection of molten metal from the bath.

Method of rapidly decarburizing ferro- alloys with oxygen

A ferro-alloy, namely ferrochrome or ferromanganese, is refined by being heated to at least 100.degree. C above its melting point to form a bath whereupon oxygen is blown into the melt, below the bath surface, within a protective gas envelope. The rate of oxygen blowing is so chosen that 1% of carbon is oxidized within a period not to exceed about ten minutes, preferably not more than five minutes.

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Munich, Georgia

Fritz Stadler