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Iron carbide - a new type of steelmaking raw material

2018-08-23 01:00 View:
Iron carbide - a new type of steelmaking raw material
 
In recent years, changes in supply and demand in the world's scrap market are attracting widespread attention. Although the reuse of scrap steel is already a way for steelmakers' resources, the accumulation of harmful residual elements in scrap steel during repeated use makes it impossible to meet the requirements for steel cleanliness. Therefore, although there are different views on the supply and balance of scrap steel, there is a consensus on the scarcity of resources for low residual element scrap.

It is true that some domestic manufacturers have started to use direct reduced iron as a substitute for high-quality scrap, just like foreign counterparts. However, due to limited sources of direct reduced iron and high import prices, it is only in places where raw materials and energy supply are sufficient. Economy. To this end, all countries in the world are exploring and researching the production process of new clean scrap products. Finding a cheap substitute for high-quality scrap has become a hot research topic in the world, and the direct reduction of iron carbide is more traditional. Iron has its unique advantages and is a new type of high-quality steelmaking raw material that is of general concern to the international metallurgical industry.
 
Characteristics of iron carbide
 
In the search for cheap high-quality scrap substitutes, iron carbide has attracted the interest of people in the steel industry around the world because of its inherent characteristics and the advantages of improving the quality of steel.

The main advantages of iron carbide are:
1 It has high chemical stability, is not self-igniting, and is not sensitive to secondary oxidation, so it is easy to store and transport;
2 Its own sulfur, phosphorus and other harmful impurities are low in content, and at the same time in steel production. It can also reduce the concentration of harmful impurities in the steel;
3 contains 2% to 3% (mass fraction, the same below) iron oxide, and contains up to 6% carbon. Carbon is usually produced in the form of combustion during steelmaking, so it can save an order of magnitude of heat energy by using scrap steel or direct reduced iron steel.
4 It can directly use concentrate powder to produce iron carbide without agglomeration, thus enabling rapid melt blowing. ;
5 can be used as a recarburizer and coolant in the steelmaking process;
6 It should be carried out under lower temperature and fluidization conditions, so it has higher thermal efficiency, and because the temperature is not high, it is not metallized iron, so there is no agglomeration and non-fluidization problem on the inner wall of the reactor; The gas closed loop process is adopted, and there is no problem of reactant loss. The only by-product is water vapor, which reduces environmental pollution;

 
Equipment investment is low and cost is low. According to the data, the production cost per ton of steel can be reduced by $20 compared to the process of producing direct reduced iron. In view of the above advantages and effects in experimental applications, iron carbide has been used in electric arc furnaces, converters and ladle.
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