Iron production technology mainly includes: iron making, steel making, steel rolling, etc. Among them:
1. Iron making: it is the process of reducing iron from sinter and block ore. Coke, sinter, lump ore and a small amount of limestone are sent into a blast furnace to be smelted into liquid pig iron (molten iron), which is then sent to a steel mill as the raw material for steelmaking.
2. Steelmaking: remove excessive carbon, sulfur, phosphorus and other impurities from raw materials (molten iron and scrap steel, etc.) and add appropriate amount of alloy ingredients.
3. Continuous casting: molten steel is continuously injected into the water-cooled mold through the tundish, and the solidified shell is pulled out of the mold at a stable speed and cooled by water spraying. After all solidified, the steel is cut into continuous casting billets of specified length.
4. Steel rolling: the steel ingot and continuous casting billet produced by continuous casting are rolled into various types of steel products by hot rolling in different rolling machines.
1, steel
(1) coking: the process in which the coking coal is mixed and broken and then added into the coking furnace, and the hot coke and coarse coke oven gas are produced after the dry distillation
(2) sintering: after mixing and granulating the silt iron ore, various cosolvent and fine coke, the fine coke is added into the sintering machine through the distributing system, the fine coke is ignited by the firing furnace, and the sintering reaction is completed through the exhaust windmill. After the high-heat sinter is broken, cooled and screened, it is sent to the blast furnace as the main raw material for smelting molten iron
(3) blast furnace: the process of adding iron ore, coke and flux from the top of the blast furnace into the furnace, and then pouring high temperature hot air into the lower blast nozzle to produce reducing gas, reducing iron ore, molten iron and slag.
(4) converter, steel mills will melt first milling treatment station for dephosphorization and desulfurization treatment before send, after converter steel properties and the quality requirements in accordance with the order, again send secondary refining treatment station (RH vacuum degassing treatment station, Ladle Injection sheng barrels blowing treatment station, VOD vacuum oxygen decarbonization treatment station, the STN mixing station, etc.) for all kinds of processing, adjust the composition of molten steel, finally send big billet and flat steel billet continuous casting machine, cast into semi-finished products, red billet by the surface defect inspection, grinding or burning, or directly send the downstream rolled into steel, wire rod, steel plate, steel coil and steel pieces and finished products.
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