The Difference Between Primary Reduction Iron Powders And Secondary Reduction Iron Powder
The difference between Primary Reduction Iron Powders and secondary reduction iron powder
We are not familiar with all of us, we often see in the laboratory inside. Reduction of iron powder generally by the three iron oxide in high heat conditions in the hydrogen stream or carbon monoxide gas stream reduction generated, the main component of the structure of loose elemental iron. There are many types of reduced iron powder, there is Primary Reduction Iron Powders and secondary reduction of iron powder, although the two kinds of names are different, but the difference between them is very large, then a reduction of iron and secondary reduction of iron powder what What is the difference? Reduced iron powder
1, the production method is different: Primary Reduction Iron Powders is a direct reduction method to produce pig iron, and the second reduction of iron powder is the melting reduction method to produce pig iron.
2, the production of different temperatures: Primary Reduction Iron Powders is lower than the melting temperature, while the secondary reduction of iron powder is in the high temperature melting state.
3, the production process is different: Primary Reduction Iron Powders is below the melting temperature of iron ore will be reduced to sponge iron iron production process, and the second reduction of iron powder is no blast furnace and in the high temperature melting state reduction Iron ore method.
4, the product composition is different: Primary Reduction Iron Powders products for the direct reduction of iron, also known as sponge iron, and the secondary reduction of iron powder composition and blast furnace hot metal similar to the liquid hot metal.
With the continuous improvement of China's powder metallurgy industry technology, the current powder metallurgy parts are widely used in aircraft, firearms, motorcycles, family cars, automobiles, agricultural machinery, mining, power tools, machine tools, transportation and other machinery industry. As the reduction of iron powder itself has been powder, coupled with its microstructure and very loose, so its surface area great. In the chemical production and laboratory operations commonly used as high-quality reducing agent.
Primary Reduction Iron Powders development process
The primary reduction of iron powder actually refers to the melting recovery of the pig iron. Melt recovery method refers to the use of blast furnace and in the high temperature melting state of iron ore recovery method, the product is the composition and blast furnace hot metal near the molten iron. The intention of developing a melt recovery method is to replace or make up the blast furnace ironmaking. Primary Reduction Iron Powders Compared with the blast furnace ironmaking process, melting iron has the following characteristics:
(1) fuel coal without coke, can not build coke oven, reduce pollution.
(2) can be used with the same blast furnace as a block of iron material or direct use of mineral powder as a material. If the use of mineral powder as a material, may not build sintering plant or pellet plant.
(3) all with oxygen without air, oxygen consumption.
(4) can be produced with the blast furnace hot metal composition, the temperature is basically the same as the molten iron for converter steel.
(5) In addition to the production of molten iron, but also a lot of high calorific value of gas.
At present, many of the world's melt recovery method, during which as long as Corex method skills are more sophisticated and has constituted the scale of industrial production, other methods are still carried out and industrialization process. The melt recovery method has not been extensively carried out in China and is currently in laboratory and semi-industrial experiments.
Application of Primary Reduction Iron Powders:
Once the reduction of iron powder is widely used in powder metallurgy products, oxygen scavenger, water purifier, auto parts manufacturing, medical, and welding rods production, and electrical cutting and other occupations. During which powder metallurgy products accounted for about 70%. (Note: welding electrode for the recovery of iron powder, in the skin to participate in 10% -70% iron can be useful to improve the welding technology and significantly improve the welding power.