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Yuxin sponge iron ore of high quality, the use of oxidation-reduction reaction principle, through the filter precipitate way except to exclude, after dissolved oxygen content of the water pipes, boilers and circulating water dissolved oxygen corrosion by water can be to 0.05mg / L or less. in the rotary kiln, furnace or other reactors, coal, coke, natural gas or hydrogen, iron ore or iron ore pellets at a temperature below the melting temperature of the material conditions of low temperature reduction, become porous product which is reduced to iron out was small iron core, shaped like a sea Kam, it said. sponge was cooled, crushing, magnetic separation, can be removed gangue or other impurities (metallic iron accounted for more than 90% iron, could be directly used in steelmaking; 90% less for blast furnace or electric furnace ironmaking) below below the melting temperature of the reduction of iron ore into sponge iron production process, its products direct reduced iron (ie DRI). , also known as sponge iron. The product has not been melted, remains ore shape, due to the reduction of loss of oxygen to form a large number of pores, the Mission under the microscope named after the shape of the sponge. sponge iron is characterized by low carbon ((1%), and save the ore gangue. These features make it not suitable for large-scale steelmaking, only suitable as a substitute scrap electric steelmaking raw materials. sponge iron and non-ferrous metal content of harmful impurities low sulfur, phosphorus, etc., have in favor of high-quality steel smelting furnace. iron content of more than 97% belong to sponge iron, but used in powder metallurgy field, its shape points lump and powder (once reduced iron powder), such as deep-processing can be done twice reduced iron powder, its iron content will reach more than 99%. |