METHOD OF INCREASING METAL-BEARING CAPACITY OF SLAG DUE TO MODIFICATION OF SLAG-FORMING MIXTURES Russian patent published in 2018 - IPC C21C5/36 

FIELD: metallurgy.

SUBSTANCE: slag-forming mixture is ground to a fraction of less than 0.001 mm, and the present refractory carbonates are removed by adding concentrated hydrochloric acid. Then pre-ground siderite (FeCO₃) is added to the dried mixture in amount equal to the number of removed carbonates, the mixture is stirred, and the produced mixture is granulated. The replacement of refractory carbonates with iron carbonate in the composition prevents foaming of slag, which results in elimination of additional oxidation and carbonisation of steel and improvement of cast blank quality.

EFFECT: increased amount of siderite in slag creates conditions for secondary processing of slag with extraction of iron from it.

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