Method and system for preparing metallized pellet

A technology for metallizing pellets and pellets, applied in the fields of energy and metallurgy, can solve the problems of worsening the ventilation of the charge, reducing the life of the rotary hearth furnace, and eroding the bottom materials of the furnace.

Pending Publication Date: 2017-05-31
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now, if a thick material layer is laid in the rotary hearth furnace, it is generally necessary to increase the temperature of the rotary hearth furnace to increase the heat transfer effect, but if the temperature is too high, the pellets will melt, especially the surface l...

Method used

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  • Method and system for preparing metallized pellet
  • Method and system for preparing metallized pellet
  • Method and system for preparing metallized pellet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] (1) Mix copper smelting slag (TFe is 41%, Zn is 2.7%) with reduced coal, sodium carbonate, and bentonite. The mixing ratio is 100:27:3:4, and the carbon-oxygen ratio is 1.8. The first mixture The raw materials are pelletized to obtain cue balls. The particle size of the pellets is in the range of 10 to 14. The unqualified pellets are screened and returned to the moistening mill, and re-enter the feeding area of ​​the first pelletizing process. Mix metal iron powder (with a particle size of 0.074mm~0.1mm) and binder at a ratio of 100:5. After mixing, use the cue ball as the cue ball to enter the second ball making process, and wrap the second mixture evenly On the surface of the cue ball, composite carbon-containing pellets are obtained, and the qualified particle size of the composite carbon-containing pellets is 12-16 mm.

[0068](2) Evenly distribute the composite carbon-containing pellets into the rotary hearth furnace for direct reduction, the thickness of the pavin...

Embodiment 2

[0072] (1) Mix zinc slag (TFe is 22%, Zn content is 16%, lead content is 4%) and reduced coal, the mixing ratio is 100:21, the carbon-oxygen ratio is 2.2, and the first mixed material is made Balls are obtained to obtain cue balls. The particle size of the pellets is in the range of 10 to 14. The unqualified pellets are screened and returned to the moistening mill, and re-enter the feeding area of ​​the first pelletizing process. Mix metal iron powder (with a particle size of 0.074mm to 0.1mm) and binder at a ratio of 100:5. After mixing, use the cue ball as the cue ball and enter the second ball making process, and wrap the second mixture evenly On the surface of the cue ball, composite carbon-containing pellets are obtained, and the qualified particle size of the composite carbon-containing pellets is 12-16 mm.

[0073] (2) Evenly distribute the composite carbon-containing pellets into the rotary hearth furnace for direct reduction. The thickness of the paving material is 5-...

Embodiment 3

[0077] (1) Mix zinc-containing dust (TFe is 45%, Zn is 3%, C is 4%) with reduced coal and bentonite, the mixing ratio is 100:24:4, the carbon-oxygen ratio is 1.8, and the first The mixed material is pelletized to obtain cue balls. The particle size of the pellets is in the range of 10 to 14. The unqualified pellets are screened and returned to the moist mill, and re-enter the feeding area of ​​the first pelletizing process. Mix metal iron powder (with a particle size of 0.074mm to 0.1mm) and binder at a ratio of 100:5. After mixing, use the cue ball as the cue ball and enter the second ball making process, and wrap the second mixture evenly On the surface of the cue ball, composite carbon-containing pellets are obtained, and the qualified particle size of the composite carbon-containing pellets is 11-15mm.

[0078] (2) Evenly distribute the composite carbon-containing pellets into the rotary hearth furnace for direct reduction. The thickness of the material is 7 to 8 layers of...

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Abstract

The invention provides a method and system for preparing a metallized pellet. The method for preparing the metallized pellet comprises the steps that an iron containing raw material, reduction coal, a fluxing agent and a binder are subjected to first mixing, so that a first mixed material is obtained; the first mixed material is subjected to first pelletizing treatment, so that a mother ball is obtained; metal iron powder and the binder are subjected to second mixing, so that a second mixed material is obtained; the mother ball and the second mixed material are subjected to second pelletizing treatment, so that the mother ball is wrapped by the metal iron powder, and a composite carbon-containing pellet with the mother ball as a core is obtained; the composite carbon-containing pellet is conveyed into a rotary hearth furnace to be distributed in many layers, and direct reduction treatment is carried out in the rotary hearth furnace, so that the metallized pellet is obtained; and the metallized pellet is subjected to ball grinding and magnetic separation treatment, so that metal iron powder and tailings are obtained. By means of the method, the distribution thickness can be effectively increased, surface pellet melting can be effectively avoided, and the metallization ratio and reduction uniformity of the multi-layer pellet are increased.

Description

technical field [0001] The invention belongs to the field of energy and metallurgy, and in particular relates to a method and a system for preparing carbon-containing pellets. Background technique [0002] The rotary hearth furnace has the characteristics of high reduction temperature, short heating time, relatively static charge and furnace bottom, etc., which can better meet the requirements of direct reduction. At present, rotary hearth furnaces are generally used to process various composite ores, low-grade complex refractory ores, and metallurgical iron-containing solid wastes. The heat required for the temperature rise and reaction of the carbon-containing pellets in the rotary hearth furnace mainly depends on the radiation heat transfer of the furnace wall and furnace gas. The material layer thickness is generally thin (~50mm) operation, resulting in low productivity of the rotary hearth furnace, which indirectly leads to low heat utilization rate in the rotary heart...

Claims

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Application Information

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IPC IPC(8): C21B13/10C22B1/244C22B1/248
CPCC21B13/105C22B1/2406C22B1/244C22B1/248
Inventor 古明远王福佳曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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