Sponge iron is also called the direct reduced iron (DRI), is a high-quality hematite stone as raw material, USES the high quality sponge iron ore, using the REDOX reaction principle, through a filter in addition to rule out in the form of lake pipe, boiler and circulating water dissolved oxygen corrosion after water treatment water dissolved oxygen content can be below 0.05 mg/L. In rotary kiln, shaft furnace or other reactor, coal, coke, gas or hydrogen gas, iron ore and pellets of iron concentrate in below material melt temperature under the condition of low temperature reduction, become the product of cellular.The reduction of iron with small iron core, like brocade, therefore calls the sponge iron, after cooling, crushing, magnetic separation, can eliminate gangue or other impurities (metallic iron more than 90% of total iron, can be directly used in steelmaking; below 90%, used in the blast furnace or electric furnace ironmaking).