The Role Of Ferrophosphorus in The Steelmaking Process

The role of ferrophosphorus in the steelmaking process

Ferrophosphorus is obtained from phosphorus-making electric furnaces. It is a symbiotic compound containing 20-26% phosphorus and 0.1-6% silicon, which can change the corrosion resistance and chipping properties of steel. Ferrophosphorus is used as an alloying agent in the steelmaking industry and can also produce phosphates.

The iron phosphorus produced by our company comes in two varieties: FeP1 and FeP2, containing 15 to 20% phosphorus. The atomic number of phosphorus is 15, the atomic weight is 30.97, the outer electronic structure is 3S3P, the density is 1.83g/cm3 (white phosphorus) and 2.2g/cm3 (red phosphorus), the melting point is 44°C, and the boiling point is 257°C. There are phosphides such as Fe3P, Fe2P, FeP, and FeP2. The melting temperature range of phosphorus iron containing 18% to 25% phosphorus is 1100~1250℃, and the density is 5.8~6.5g/cm3.

Enhance the fluidity of molten iron: phosphorus iron alloy, strictly control the phosphorus content index to ensure that the phosphorus iron is wear-resistant and brittle. Overall improvement in wear resistance: About 0.15% phosphorus can significantly improve the wear resistance of cast iron. Increase the tensile strength of steel, improve casting performance and surface quality. Improve thermal conductivity and heat resistance: The phosphorus eutectic distributed in a network effectively improves thermal conductivity and heat resistance. Make the wear surface uniform and prevent sparks from being easily generated during friction.

The electric furnace is a closed submerged arc reduction electric furnace. The furnace cover is made of high alumina bricks or prefabricated with heat-resistant concrete. The furnace lining is made of carbon bricks. Graphite electrodes are used. The electrode holes on the furnace cover and the gap between the electrodes are sealed with water or sand to ensure that the electrodes can rise and fall freely without furnace gas leakage.

Extroverted. The phosphorus recovery system consists of three washing towers, collection tanks, phosphorus collection tanks, etc. The evenly mixed charge continuously enters the furnace from the furnace top silo through the charge tube, and then falls as the charge melts. The molten iron and slag are released regularly and flow into the slag-iron separation tank next to the furnace. The iron is in the lower part of the separation tank, and the slag flows into the water quenching chute and is quenched with water with a pressure of 0.3MPa. After the molten iron pokes the small hole in the lower part, it flows into the brush Inside the cast iron mold with white ash.