Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1977-02-24
1978-03-07
Rosenberg, P. D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 53, 75257, C21C 700, C22B 910
Patent
active
RE0295671
ABSTRACT:
A method for refining an iron-base metal such as pig iron which contains minor amounts of elements including silicon, manganese, phosphorus, carbon, sulfur, and other incidental impurities, characterized by the steps of containing molten iron-base metal in a metallurgical vessel, heating and oxidizing the molten metal to cause chemical reactions to remove excessive contents of the said elements, adding solid lime and a mixture of fluorspar and slag conditioners of relatively high basicity (lime-to-silica ratios of 2.5 to 4.0) which conditioners consist essentially of oxides of selected metals including iron, manganese, silicon, magnesium, and calcium, and which conditioners have a melting point of from about 2,000 to 2,800 F, and continuing to heat while oxidizing the mixture of the molten metal, slag conditioner, fluorspar and slag-forming materials until said minor amounts of elements are reduced to the desired percentages, and are retained in the slag formed. More specifically, the function of the slag-conditioner is to eliminate the encapsulation of large particles of lime by dicalcium silicate and thereby more rapidly taking the lime into solution. The function of the mixture of fluorspar and slag conditioner is to promote more rapid solution of the solid lime than is obtainable with the use of either fluorspar or slag conditioner alone.
REFERENCES:
patent: 2781256 (1957-02-01), Richards
patent: 3799762 (1974-03-01), Cass
patent: 3802865 (1974-04-01), Ohkubo
Johns L. P.
Rosenberg P. D.
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