The pelletizing factory will introduce the smelting process of pig iron for you.
Although the smelting principle of pig iron is the same, the process flow is also different due to different smelting methods and equipment. Here is a brief introduction.
Blast furnace production is continuous. The blast furnace (from opening to overhauling and shutting down) can be continuously produced for several to more than ten years. In the production process, iron ore, coke and flux are continuously charged from the top of the furnace (the top of the furnace is generally composed of material type and hopper, and the modern blast furnace is composed of bell valve top and bell less top). Hot air (1000-1300 ℃) is blown into the lower tuyere of the blast furnace and injected with oil, coal or natural gas and other fuels.
The iron ore loaded into the blast furnace is mainly composed of iron and oxygen compounds. At high temperatures, carbon and ejecta from coke and carbon monoxide from combustion capture oxygen from iron ore into iron. This process is called reduction. The iron ore is converted into pig iron by reduction reaction, and the molten iron is discharged from the tap hole.
Coal gangue, coke in iron ore and ash in ejecta combine with limestone and other fluxes in the furnace to form slag, which is discharged from the tap hole and the slag outlet respectively. The gas comes from the top of the furnace and is used as industrial gas after dedusting. The modern blast furnace can also use the high pressure of the top of the furnace, and use part of the derived gas to generate electricity.
Pig iron is the product of blast furnace. The product of blast furnace is not only pig iron, but also ferromanganese, which belongs to ferroalloy products. Ferromanganese blast furnace does not participate in the calculation of various indexes of blast furnace. Slag, slag cotton and blast furnace gas are also produced in the process of blast furnace ironmaking.
Iron coke technology is to use low-cost non caking coal or micro caking coal as raw material, mix with iron ore powder, make into block, use continuous heating furnace to heat and dry distillation, and get iron coke containing 37 coke. After being processed by professional equipment and smelted, the same ironmaking effect as the original process can be obtained.
In this process, the original iron coke is replaced by high content iron coke. The test shows that the process can save a lot of coke and main coking coal. The test also shows that the reaction rate of iron coke can be increased, and the iron coke content of blast furnace can reach at least 30%. This technology is being produced in various factories in Japan and some achievements have been made. However, at this stage, this technology has not been fully formed and needs a lot of experiments to improve.
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