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4. Recent developments in the blast furnace method To improve efficiency, particularly in dealing with lower grade materials, increasing effort is being put in
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4. Recent developments in the blast furnace method To improve efficiency, particularly in dealing with lower grade materials, increasing effort is being put into preparing the charge before it enters the furnace. Low-grade ores (20—30 per cent Fe) are concentrated by drying and calcining,[1] a mild heating which drives off water and carbon dioxide, and are sometimes given more extensive beneficiation treat-
4. Recent developments in the blast furnace method To improve efficiency, particularly in dealing with lower grade materials, increasing effort is being put into preparing the charge before it enters the furnace. Low-grade ores (20-30 per cent Fe) are concentrated by drying and calcining, [1] a mild heating which drives off water and carbon dioxide, and are sometimes more more substantial beneficiation treat-
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