Phosphorus is present in all components of the blastfurnace batch: ore, coke, limestone, and additives. Coke usually contains around 0.01-0.02 percent P (in some cases 0.03-0.05 percent P). Coke introduces a considerable quantity of phosphorus in smelting foundry iron and ferromanganese on account of its increased consumption. Limestone contains no more than 0.01-0.02 percent P. In iron ore from various deposits, the phosphorus content varies from tenths of a percent to 1.3-1.5 percent; even for the same deposit, there may be significant variation [1]. Manganese ore contains 0.20-0.32 percent P [2]. It is generally assumed that all the phosphorus in the blast-furnace batch enters the hot metal on smelting. However, this is not entirely correct: when the contacting phases are in or near equilibrium (as in a blast furnace), the activity of the components should be equal, and hence each component may be present in all the contacting phases.
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