(1) For the production of sponge iron or the preparation of reduced iron powder. Sponge iron can be used as a supplement to the shortage of scrap steel for steelmaking. As the steel production of electric furnaces continues to rise, sponge iron is becoming more and more important. The use of ore powder to produce sponge iron is still difficult to achieve rapid development in China due to its large equipment investment and complicated process. Using an appropriate process, pulverized coal may be reducing iron oxide to produce w (high Fe, and low heteroatom content stable quality sponge iron, the sponge iron is more suitable than a mineral production (normally containing gangue impurities) as high Scrap is used. Iron oxide scale can also be used to produce reduced iron powder. The production process of iron oxide scale to produce reduced iron powder is generally divided into coarse reduction and fine reduction. The iron oxide scale is reduced to about w (Fe>95%, w (C<0.5% sponge iron) by a crude reduction process; the obtained sponge iron piece is subsequently pulverized at a temperature of 800 to 1000 ° C. Fine reduction is carried out in an ammonia decomposition atmosphere or pure hydrogen. Finally, pulverization, sieving, and particle size adjustment are carried out to prepare iron powder. Iron oxide used to produce a reduced iron raw material in powder metallurgy. The iron oxide scale is reduced to w(Fe 98% or more sponge iron, which is finely slag, crushed, sieved and magnetically selected, and then refined to produce qualified reduced iron powder. Then it is finely ground into a ball mill and obtained by grading. High-purity iron powder with a particle size. Fine-grained iron powder is used to make key parts of the equipment. It can be molded at one time by pressing the mold to obtain high-strength, wear-resistant and corrosion-resistant parts. It can be used in the defense industry and aerospace manufacturing. Important industries such as transportation, oil exploration, etc. Iron powder with a coarser particle size can be used to produce welding electrodes. (2) Used as a sintering auxiliary iron-containing raw material or a steel-making aided melting slag agent. The FeO content in the iron oxide scale is up to 50%, which is a good auxiliary material for iron production in sintering production. The theoretical calculation results show that the oxidation of 1kg FeO to Fe2O3 can exotherm 1973 joules. After the iron oxide scale is added to the sintered mixture, since the sintering temperature is high and the sintering process is sufficient, the sintering productivity is improved and the solid fuel consumption is lowered. Production practice shows that 8% of iron oxide scale can increase production by about 2%. Baosteel uses iron oxide scale as an auxiliary material to add iron oxide scale to the mixed ore. On the one hand, the permeability of the sintered layer is improved due to the relatively large particle size of the scale. On the other hand, the scale is exothermic during the sintering process. This reduces solid fuel consumption. Also. The use of iron oxide can be used as a fluxing agent for ore fluxing and is used in converter steelmaking. The iron oxide scale used as a flux-forming slag agent is a high-efficiency smelting fluxing material, which can improve steelmaking efficiency, reduce coke and coal consumption, and prolong the service life of the converter furnace body. (3) Substituting steel scraps to smelt ferrosilicon or substitute scrap for electric steelmaking. Steel scrap is an important raw material for smelting ferrosilicon alloy. The amount of steel scrap used in smelting ferroalloys in China is about 2 million tons per year, while the steel industry wastes about 10 million tons of iron oxide per year. A new process for smelting ferrosilicon alloy with iron oxide instead of steel scrap has been developed and achieved good economic benefits. Electric steelmaking requires scrap steel as raw material, and strict requirements for scrap steel materials, but such scrap steel is small in quantity, high in price, and insufficient in supply. Waste materials such as iron oxide scale and slag steel, which are inexpensive and widely sourced, are used as the main raw materials to replace the scrap steel with low price and high cost, which has significant economic benefits. 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Comprehensive utilization of iron oxide scale: can be used to prepare reduced iron powder, etc.
Iron oxide scale rolling mill in the rolling process of rolling the generated surface, high iron content. China's steel industry has to abandon a large number of iron oxide skin every year, and the comprehensive utilization of these iron oxide scales is undoubtedly a very meaningful energy-saving and consumption-reducing work. According to the current research, the comprehensive utilization of iron oxide scale can be carried out in the following aspects.