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Method for manufacturing semicoke for sintering

A semi-coke and production method technology, applied in coke ovens, special forms of dry distillation, petroleum industry, etc., can solve the problems of poor air permeability of the material layer, poor mechanical strength of semi-coke, etc., to expand the scope of use, improve air permeability, chemically reactive effect

Active Publication Date: 2015-03-18
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the semi-coke produced by this method has poor mechanical strength and is easy to pulverize, and the gas permeability of the material layer is not good when used for sintering

Method used

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  • Method for manufacturing semicoke for sintering
  • Method for manufacturing semicoke for sintering
  • Method for manufacturing semicoke for sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The mixture is composed of lignite, high-iron and low-silicon iron ore powder and binder asphalt, in which the mass fraction of lignite is 88%, the mass fraction of high-iron and low-silicon iron ore powder is 7%, and the mass fraction of asphalt is 5%. After mixing the mixture evenly , pressed into shape with a double-roller briquetting machine, dry-distilled in a vertical internal heating furnace at 760°C for 10 hours, and then washed with heavy media to obtain 12.4% ash, 10% volatile matter, and 77.6% fixed carbon content Semi-coke for sintering. The components of high-iron-low-silicon iron ore powder and lignite used are shown in Table 1 and Table 2.

[0019] Table 1 Chemical composition of high-iron and low-silicon iron ore powder / %

[0020]

[0021] Table 2 lignite industrial analysis / %

[0022]

[0023] In the case of the same iron material, add fuel according to the following plan for sintering test: (1) 75% coke powder (50% of coke powder <3mm) is added...

Embodiment 2

[0027] The mixture is composed of low-quality coal (lignite and bituminous coal), high-iron and low-silicon iron ore powder and binder tar residue, in which the mass fraction of inferior coal is 90%, the mass fraction of high-iron and low-silicon iron ore powder is 5%, and the mass fraction of tar residue is 5%, after the mixture is mixed evenly, it is pressed into shape with a pair of roller briquetting machine, and it is dry-distilled in a vertical internal heat furnace at 800°C for 12 hours, and then washed with a heavy medium, and the ash content is 11.6%, and the volatile content is 8. %, semi-coke for sintering with a fixed carbon content of 80.4%, in which the high-iron and low-silicon iron ore powder used is shown in Table 1, and the components of lignite and bituminous coal used are shown in Table 4.

[0028] Table 4 Coal Industry Analysis / %

[0029]

[0030] In the case of the same iron material, the sintering test is carried out with fuel according to the followi...

Embodiment 3

[0034] The mixture is composed of inferior coal (peat, lignite and bituminous coal), high-iron and low-silicon iron ore powder and binder water glass, in which the mass fraction of inferior coal is 85%, the mass fraction of high-iron and low-silicon iron ore is 8%, and the mass fraction of asphalt is The fraction is 7%. After the mixture is mixed evenly, it is pressed into shape with a pair of roller briquetting machines. It is dry-distilled in a vertical internal heat furnace at 820°C for 13 hours, and then washed with heavy media. The ash content is 11.2%, and the volatile matter The semi-coke for sintering with a fixed carbon content of 6% and a fixed carbon content of 82.8%. The high-iron and low-silicon iron ore powder used is shown in Table 1, and the ingredients of lignite and bituminous coal used are shown in Table 6.

[0035] Table 6 Coal Industry Analysis / %

[0036]

[0037] In the case of the same iron material, the sintering test is carried out with fuel accordi...

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Abstract

The invention discloses a method for manufacturing semicoke for sintering. A mixture comprises the following raw materials: 85%-90% of fault coal, 4%-10% of high-iron and low-silicon iron ore powder and 4%-8% of a binder. The method comprises the following steps: pressing and molding the mixture after evenly mixing; carrying out destructive distillation at 700-850 DEG C for 7-15 hours; and then carrying out dense-medium cleaning under the condition that the specific gravity of the dense medium is 1.3-1.4, so as to obtain semicoke for sintering. The semicoke produced by the method has the advantages of ferrocoke and semicoke, and is strong in chemical reactivity; the semicoke and coke powder are used in a mixed manner, so that the granularity structure of sintering fuel can be optimized, and the breathability of a sintering bed is improved; the used raw materials are fault coal, brown coal and high-volatile bituminous coal, so that the application range of metallurgical industry fuel is expanded, and the cost of the sintering fuel is reduced.

Description

technical field [0001] The invention belongs to the technical field of ironmaking raw fuel production, and relates to the production technology of sintered fuel, in particular to a production method of semi-coke for sintering. Background technique [0002] The solid fuel used for sintering is coke powder or anthracite, and the particle size of the incoming fuel is usually 0mm-25mm, but the sintering process requires that the particle size should account for more than 85% of 0-3mm. Because the proportion of coarse particle size of the fuel is large, the combustion reaction will be slowed down, which cannot be synchronized with the mineralization reaction in the sintering process, which will lead to a decrease in the liquid phase during the sintering process and a decrease in the quality of the sintered ore. Therefore, the fuel needs to be crushed before sintering production. It is required that coke powder and coal powder should account for more than 85% of the particle size ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/08
CPCC10B53/08C10B57/06
Inventor 张辉周明顺翟立委刘杰徐礼兵童晓宇任伟李金莲
Owner ANGANG STEEL CO LTD
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