Method for producing sintered steel
A manufacturing method and technology for sintered ore, which are applied in the field of sintered ore manufacturing, can solve the problems of reduced quality and productivity of sintered ore, reduced productivity, reduced strength, etc., and achieve the effects of low cost, high productivity and yield
Active Publication Date: 2009-03-18
JFE STEEL CORP
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Problems solved by technology
Therefore, the molten liquid does not sufficiently spread over the adjacent ore, and since the maramba ore part remains fine pores and becomes sintered ore, the strength is lowered, and the yield is also lowered.
Moreover, due to the fine particle size of Maramba ore, when it is used in large quantities, in the raw material processing process of sintering, the particle size of the raw material after granulation is not large, and the air permeability of the sintering bed loaded on the sintering machine trolley deteriorates, and the productivity reduce
[0014] As described above, due to the depletion of high-quality hematite ore and magnetite ore, when limonite ore and maramimba ore are used in large quantities, there is a serious problem that the quality and productivity of the obtained sintered ore decrease.
Therefore, with high productivity (for example, 1.5t / h / m 2 ) It is currently difficult to produce high-quality sintered ore at low cost (for example, the gyration strength according to JIS M 8712 is 66% or more)
Method used
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[0069] Combine 70% by mass of raw material ore (powder ore), 10% by mass of powder under sintering sieve, 7-8% by mass of recyclables in the factory (mainly iron source), 12-13% by mass of auxiliary raw materials and granulation binder to form sintering Raw materials (proportioned raw materials). As the raw material ores, two or more of the iron ores A, B, and C specified in the present invention are used. After mixing the sintered raw materials with a drum mixer and adjusting the humidity for 3 minutes, the simulated particles obtained by granulating for 3 minutes were put into a pot-type experimental device with a diameter of 300 mm to form a layer thickness of 400 mm. After being ignited with a burner, Sintering is carried out at a constant negative pressure of 10KPa to produce sintered ore.
[0070] In this test, in order to make the finished sinter reach SiO 2 : 4.8-5.0% by mass, alkalinity 1.85, select the type of iron ore A, B, C and adjust the compounding amount, and...
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Abstract
Disclosed is a method for producing a sintered steel wherein a sintered steel is produced from a raw material for sintering which is composed of an iron ore A having a crystal water content of not less than 9.0 mass%, an iron ore B having a crystal water content less than 4.0 mass% and an iron ore C having a crystal water content of not less than 4.0 mass% and less than 9.0 mass% with a mixing ratio among the iron ore A, iron ore B and iron ore C being within the area defined by the points a, b, c, d and e in Fig. 1, preferably within the area defined by the points b, c, d, e, f and g in Fig. 2.
Description
technical field [0001] The present invention relates to a method for producing sintered ore used as a main raw material for blast furnaces and the like. Background technique [0002] Sintered ore, which is the main raw material of a blast furnace, is usually produced in the following manner. First, the secondary raw materials containing CaO such as lime powder, silica and serpentinite containing SiO 2 The auxiliary raw materials and carbon materials such as powder coke are blended into the raw material ore (iron powder ore), and an appropriate amount of water is added to it for blending and granulation. The granulated mixed raw material (sintered raw material) is filled on the trolley of the Trout sintering machine to a predetermined thickness, and the carbon material in the surface layer of the packed bed is ignited, and the inside of the packed bed is sucked downward while sucking air. The carbon material is combusted, and the blended raw materials are sintered by the co...
Claims
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IPC IPC(8): C22B1/16
Inventor 佐藤秀明大山伸幸町田智大屋宪司
Owner JFE STEEL CORP