How does prawn iron ore become iron? The more detailed, the better.

Main raw materials: iron ore, coke, limestone and air. Iron ore, coke and limestone are mixed into charge according to a certain proportion, which is added into the furnace in batches from the feed inlet at the top of the furnace, and preheated air is blown into the furnace from the air inlet at the bottom of the furnace belly. 2。 Because the hot gas rises from the bottom and the burden falls from the top, they can fully contact in the furnace, so that the reaction can proceed smoothly, and at the same time, the burden can be gradually preheated, so that the heat energy can be fully utilized. Near the air inlet, coke burns with hot air to produce carbon dioxide and give off a lot of heat. 3。 Carbon dioxide gas rises and reacts with hot coke to produce carbon monoxide. 4。 Carbon monoxide gas rises and contacts with iron ore continuously added from the top of blast furnace, and then gradually falls. In the middle of the furnace shaft, most iron oxide is reduced to iron by carbon monoxide. 5。 In the smelting process, elements such as manganese, silicon, sulfur and phosphorus mixed in iron ore will also be reduced from their compounds by carbon or carbon monoxide. A small amount of carbon, manganese, silicon, sulfur and phosphorus are melted in iron at high temperature to become pig iron. The melting point of pig iron (1 100- 1200℃) is much lower than that of pure iron (1535℃). 6。 In addition to iron oxides, iron ore also contains refractory gangue, which will affect the smelting of pig iron if it is not removed. Limestone is added as a solvent to remove gangue. Because calcium oxide decomposed from limestone at high temperature can react with silicon dioxide in gangue to produce calcium silicate with low melting point, which is separated from ore.