GB422592A - Improvements in and relating to processes for recovering vanadium from pig-iron - Google Patents

Abstract

Vanadium is recovered from pig iron by adding a strongly basic and very liquid slag to the molten pig iron before or during oxidation of the vanadium, removing the slag as soon as the vanadium is completely oxidized, and recovering vanadium or its compounds from the slag. The basicity of the slag may be determined by the presence of sodium or potassium compounds, ferrous oxide, or manganous oxide. When the molten iron is run directly into the slag, preliminary oxidation of the vanadium may be promoted by increasing the distance through which the iron drops, by supplying air enriched with oxygen or steam to the iron, or by adding to the iron substances adapted to yield oxygen such as red iron ore or slags containing ferrous oxide. Prior to removal of vanadium, the pig iron may first be freed from silicon by the use of a slag rich in silicic acid; in this case oxidation of the vanadium during following treatment with the basic slag may be promoted by addition to the slag of metallic oxides, such as red iron ore. After removal of vanadium, refining of the pig iron may be completed. The Specification, as open to inspection under Sect. 91, states p that the basic character of the slag may be determined by the use of pig-iron containing manganese, or by adding manganese ores or manganese-containing slags to the slag. This subject-matter does not appear in the Specification as accepted.ALSO:Vanadium is removed from pig iron by adding a strongly basic and very liquid slag to the molten pig iron before or during oxidation of the vanadium, and removing the slag as soon as the ionadium is completely oxidized. The basicity of the slag may be determined by the presence of sodium or potassium compounds, ferrous oxide, or manganous oxide. When the molten iron is run directly into the slag, preliminary oxidation of the vanadium may be promoted by increasing the distance through which the iron drops, by supplying air enriched with oxygen or steam to the iron, or by adding to the iron substances adapted to yield oxygen such as red iron ore or slogs containing ferrous oxide. Prior to removal of vanadium, the pig iron may first be freed from silicon by the use of a slag rich in silicic acid; in this case oxidation of the vanadium during following treatment with the basic slag may be promoted by addition to the slag of metallic oxides such as red iron ore. After removal of vanadium, refining of the pig iron may be completed. The Specification, as open to inspection under Sect. 91, states that the basic character of the slag may be determined by the use of pig iron containing manganese, or by adding manganese ores or manganese-containing slags to the slag. This subject-matter does not appear in the Specification as accepted.