Secondary reduced iron is actually referring to the recovery method starting pig iron. Recovery Act means having to melt while the recovery of iron ore in a blast furnace at high temperature molten state approach , which is a component of goods and liquid molten hot metal nearby . Intent is to develop an alternative method of melting recover or compensate for blast furnace ironmaking . Compared with blast furnace ironmaking process , molten iron method has the following characteristics :
( 1 ) fuel instead of coal coke, coke oven time to build , to reduce pollution .
( 2 ) can be used as blast furnace lump iron ore to make direct use of material or materials . Such as the use of slag as a material , may build sintering plant or pellet plant .
( 3 ) all with oxygen instead of air, oxygen consuming large .
( 4 ) can be output with the hot metal composition, temperature molten fundamentally the same for steelmaking .
( 5 ) In addition to the production of hot metal , but also occurs in many of the high calorific value gas .
　Recovery Act melt many current world , as long as the Corex method during seasoned skills match the scale of industrial production has been constituted , the other dharmas still ongoing and the process of industrialization . Recovery Act melt in China has not been a great launch , currently in laboratory experiments during and semi-industrial experiments.
Secondary effect of reduced iron :
　Reduced iron powder is widely used in secondary metallurgy products , oxygen scavenger , purifying agent , auto parts manufacturing, medicine, and brake pads production welding , cutting and other professional and electrical . During metallurgy products accounted for about 70 %. ( Note: The special welding iron recovery , participated in 10% -70 % iron in the coating can be useful to improve the welding rod welding technology and significant progress deposited power .