Method for applying Bayan Obo ore ultra-fine iron powder in sintering

An application method and technology for fine iron, applied in the field of ultra-fine iron powder, can solve the problems of complex process and high manufacturing cost, and achieve the effects of overcoming complex process, simple process and increased solid fuel consumption.

Active Publication Date: 2012-07-18
INNER MONGOLIA BAOTOU STEEL UNION
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Both of the above have the disadvantages of complicated process and high manufacturing cost.

Method used

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  • Method for applying Bayan Obo ore ultra-fine iron powder in sintering
  • Method for applying Bayan Obo ore ultra-fine iron powder in sintering
  • Method for applying Bayan Obo ore ultra-fine iron powder in sintering

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Experimental program
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Embodiment 3

[0021] Embodiment 3: Test embodiment for increasing the basicity of sintered ore.

[0022] Example 3 The proportions of various raw materials and fuels for sintering with superfine iron concentrate are shown in Table 4, and the chemical composition and process indicators of sinter with superfine iron concentrate for sintering are shown in Table 5.

[0023] In Example 3, except for 15% Australian ore powder in the iron material of the mixture, all iron materials use ultrafine iron fine powder, and the ratio of ultrafine iron fine powder to iron material is 85%.

[0024] Table 4 sintering and adding ultra-fine iron concentrate various raw materials and fuel ratios (wt%)

[0025]

[0026] Table 5 Sinter chemical composition and process index of sinter with superfine iron concentrate

[0027]

[0028] It can be seen from Table 5 that, compared with the reference point, increasing the sinter basicity to 2.04 has a greater effect on improving the sinter utilization coefficien...

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Abstract

A method for applying Bayan Obo ore ultra-fine iron powder in sintering is a using method in sintering before iron making and belongs to the technical field of ferrous metallurgy sintering. The method for applying the Bayan Obo ore ultra-fine iron powder in sintering is characterized by comprising the steps of evenly mixing and pelletizing Bayan Obo ore main ore concentrate 16%-31%, Bayan Obo oreultra-fine iron ore concentrate 17%-31%, Mongolia ore powder 8.0%-9.0%, limestone 4.9%-5.1%, dolomite 2.4%-2.6%, unslaked lime 2.1%, coke powder 4.4%-4.5% and returned ores 30%, then performing sintering in a sinter pot and supplying sintered finished ores for a blast furnace, wherein the alkalinity of the sintered ores is controlled in a range of 1.90-2.05, and MgO is controlled in a range of 1.9%-2.1%. The Bayan Obo ore ultra-fine iron powder is added into sintering mixed materials, thereby improving air permeability and the yield of the sintered ores. In addition, solid burn-up is reduced remarkably, and the process is simple.

Description

Technical field: [0001] The invention discloses a special superfine iron fine powder and its use method in iron pre-sintering, which belongs to the technical field of black metallurgy sintering. Background technique: [0002] The Baiyun Obo Iron Mine used by Baotou Steel has its own main east concentrate and west concentrate, with a total annual output of 9 million tons. Must and mainly digested in sintering. Baiyun Obo Mine is very special, F, S, P, Ka 2 O, Na 2 There are many harmful impurities such as O, and its concentrate has a fine particle size, and the -200 mesh content of Zhudong concentrate is as high as 80%. In particular, the Xixi concentrate is transported to the factory through the slurry pipeline, and the particle size is finer. The content of -200 mesh is as high as 95%, and the content of -300 mesh is as high as 75%, which belongs to ultrafine iron concentrate. The particularity and ultra-fine particle size of Baiyan Obo Mine, if added to the sintering m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
Inventor 韩淑霞康文革吕志义沈茂森杜国萍赵彬张永马利高志国
Owner INNER MONGOLIA BAOTOU STEEL UNION
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