Element composition and properties of ferrophosphorus
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Element composition and properties of ferrophosphorus
Ferrophosphorus (ferrophosphorus) is an iron alloy composed of phosphorus and iron, and also contains impurities such as silicon, manganese, carbon, and sulfur. It is mainly used as a phosphorus additive for steel and iron. Ferrophosphorus is divided into four types according to phosphorus content: FeP24 (P23.0%~25.0%), FeP21 (P20.0%~23.0%), FeP18 (P17.0%~20.0%) and FePl6 (P15.0%~17.0%). Phosphorus has an atomic number of 15, an atomic weight of 30.97, an outer electron structure of 3S23P3, a density of 1.83g/cm3 (white phosphorus) and 2.2g/cm3 (red phosphorus), a melting point of 44°C, a boiling point of 257°C, and a phase diagram of the equilibrium of phosphorus and iron binary system shown in Figure 1. It can be seen from the figure that there are phosphides such as Fe3P, Fe2P, FeP, and FeP2. The melting temperature range of ferrophosphorus containing 18% to 25% phosphorus is 1100 to 1250°C, and the density is 5.8 to 6.5g/cm3.
With the intensification of blast furnace smelting, the use of titanium ore or titanium balls to protect the furnace has become one of the main means for many steel plants to stabilize production and extend the life of blast furnaces. With the increase in demand, the price of titanium ore and titanium balls has continued to rise, which has a great impact on blast furnace ironmaking and costs. Pellets have the advantages of high grade, low gangue content, high strength, and good reducibility. It is one of the main raw materials for blast furnace ironmaking.
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