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AssigneeSociete Francaise d'Electrometallurgie Sofrem
InventorsJean Cordier, Michel Demange, Jean Idier
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The invention relates to a process for the desulphurization of cast irons and steels. The product is constituted of the combination of magnesium shot or magnesium alloy with rounded contours having a granulometry of between 0.1 and 3 mm and a granulated slag having a basicity index higher than 1, containing alumina, lime, silica and magnesia, and optionally an additional flux having a granulometry of between 0.1 and 3 mm in a proportion ranging from 90 to 10% and preferably from 80 to 20% of magnesium shot and from 10 to 90% and preferably from 20 to 80% of granulated slag. Application to the desulphurization of forge pigs and foundry pig irons, to the nodularization of foundry pig irons by nozzle injection in a carrying gas stream into the liquid cast iron or steel.
A product for the desulphurization of forge pigs and foundry pig irons and steels and for the nodularization of foundry pig irons intended to be injected by means of a nozzle in a current of carrier gas into the liquid cast iron or steel, characterized in that it contains, in combination, from about 10 to about 90% of magnesium shot and from about 90 to about 10% of an expanded porous granulated basic slag comprising, alumina, silica and magnesia having an index of basicity higher than 1.
In a method for the desulphurization of forge pigs, foundry pig irons and steels and for the nodularization of foundry pig irons, the improvement comprising injecting into said forge pigs and said foundry pig irons and steels by means of a nozzle in a current of carrier gas from about 10 to about 90% of magnesium shot and from about 90 to about 10% of an expanded porous granulated basic slag having an index of basicity higher than 1 comprising as a major proportion lime and a minor proportion of additional constituents selected from the group consisting of alumina, silica, magnesia, calcium fluorides, sodium fluorides, alkali metal oxides, alkali earth metal borates and alkaline earth metal borates or a combination thereof.
Dependencies are inferred from the claim text.