Elkem Metals Company

Young E Lee

Robert H Kaiser

James H Downing

Deepak Madan

Alan FitzGibbon

Roland Gamroth

The ferrophosphorus refining method entails forming a ferrophosphorus melt and adding an oxidizing agent to the melt to oxidize the impurities in the melt. The oxidized impurities then rise to the top of the melt and either go into the slag or escape in a gaseous forte. The slag is removed and a refined ferrophosphorus is recovered. Suitable oxidizing agents include solids such as ferrous oxide (Fe.sub.2 O.sub.3), ferric oxide (Fe.sub.3 O.sub.4), ferrous-ferric oxide (FeO), mill scale, limestone, dolomitic limestone, lime and any alkalide carbonate; and gaseous oxidizing agents such as oxygen, air and mixtures thereof.

Ferrophosphorus refining process

A method for dephosphorizing a manganese alloy by first desiliconizing the alloy to a level below 0.6%, and then dephosphorizing the low silicon alloy with barium carbonate or barium oxide in combination with an oxidizing agent. The lower the silicon content the better the results.

Dephosphorization process for manganese alloys

A method for dephosphorizing a manganese containing melt is disclosed. The method encompasses the addition of a magnesium compound to a manganese containing melt to form magnesium phosphides which are removed from the melt. The method is carried out under pressure and the addition of a flux in the melt is employed to facilitate the removal of the phosphides from the melt.

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Youngstown, NY, United States of America

Young E Lee