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Preparation method of iron-ore hot-pressed carbon-containing pellet and iron-making raw material

A technology of carbon pellets and iron ore, which is applied in the field of iron ore hot-pressed carbon-containing pellets, and can solve the problems of high heat-resistance and thermal insulation performance of hot-pressing equipment, high preheating temperature, and high hot-pressing temperature , to achieve the effects of excellent reduction performance, good microstructure and simplified process flow

Active Publication Date: 2014-07-23
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method prepares a hot-pressed block with excellent metallurgical properties, but the material in this method has high preheating temperature, high hot-pressing temperature, high energy consumption, complicated process, and high heat-resisting performance of hot-pressing equipment. requirements

Method used

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  • Preparation method of iron-ore hot-pressed carbon-containing pellet and iron-making raw material
  • Preparation method of iron-ore hot-pressed carbon-containing pellet and iron-making raw material
  • Preparation method of iron-ore hot-pressed carbon-containing pellet and iron-making raw material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Firstly, iron ore fines with particle sizes less than 0.15 mm, 1 / 3 coking coal and metallurgical lime are evenly mixed to obtain the first material. Wherein, the content of the iron ore powder in the first material is 63.3wt%, and the iron ore powder whose particle size is less than 0.075mm accounts for 60% of the total amount of iron ore powder added by volume percentage, and the main components of the iron ore powder are shown in Table 1 The content of 1 / 3 coking coal is 32.6wt%, and the 1 / 3 coking coal whose particle size is less than 0.075mm accounts for 90% of the total addition amount of 1 / 3 coking coal by volume percentage, and the chemical composition of 1 / 3 coking coal is shown in Table 2 The content of metallurgical lime is 4.1wt%, and the metallurgical lime whose particle size is less than 0.075mm accounts for 100% of the total amount of metallurgical lime added by volume percentage, and the effective solvent of metallurgical lime is 85wt%.

[0022] Secondly,...

Embodiment 2

[0028] Firstly, iron ore powder with a particle size less than 0.15mm, 1 / 3 coking coal, anthracite coal powder and metallurgical lime are evenly mixed to obtain the first material. Wherein, the content of the iron ore powder in the first material is 72.7wt%, and the iron ore powder whose particle size is less than 0.075mm accounts for 70% of the total amount of iron ore powder added by volume percentage, and the main components of the iron ore powder are shown in Table 1 The content of 1 / 3 coking coal is 24.0wt%, and the 1 / 3 coking coal whose particle size is less than 0.075mm accounts for 90% of the total addition amount of 1 / 3 coking coal by volume percentage, and the chemical composition of 1 / 3 coking coal is shown in Table 2 shown; the content of anthracite coal powder is 2.3wt%, and the anthracite coal powder with particle size less than 0.075mm accounts for 90% of the total addition of anthracite coal powder by volume percentage, and the chemical composition of anthracite...

Embodiment 3

[0035] Firstly, iron ore fines with particle sizes less than 0.15mm, 1 / 3 coking coal, weakly cohesive coal dust and metallurgical lime are uniformly mixed to obtain the first material. Wherein, the content of the iron ore powder in the first material is 78.6wt%, and the iron ore powder with a particle size less than 0.075mm accounts for 60% of the total amount of iron ore powder added by volume percentage, and the main components of the iron ore powder are shown in Table 1 Shown; The content of 1 / 3 coking coal is 18.3wt%, and the 1 / 3 coking coal with particle size less than 0.075mm accounts for 90% of the total addition amount of 1 / 3 coking coal by volume percentage, and the chemical composition of 1 / 3 coking coal is shown in Table 2 Shown; The content of weak caking coal pulverized coal is 2.0wt%, and the anthracite pulverized coal with particle size less than 0.075mm accounts for 90% of the total addition amount of anthracite coal pulverized by volume percentage, and the chem...

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Abstract

The invention discloses a preparation method of an iron-ore hot-pressed carbon-containing pellet and an iron-making raw material. The preparation method comprises the following steps: uniformly mixing iron ore powder, coal dust and a solvent to obtain a first material, wherein the first material comprises 60 to 80wt% of iron ore powder, 20 to 40wt% of coal dust, and 0 to 10wt% of solvent; heating the first material to be 100 to 300 DEG C; performing hot pressing to form a pellet, so as to obtain a second material; feeding the second material into a tunnel kiln or a coal-based shaft furnace; then thermally processing for 4 to 6 hours at the temperature of 800 to 1100 DEG C under a neutral atmosphere or reducing atmosphere by a destructive distillation manner so as to obtain the iron-ore hot-pressed carbon-containing pellet. With the adoption of the preparation method, the energy consumption can be reduced, the process can be simplified, the production efficiency can be improved, and the requirements of steel and iron production on energy consumption, cost and environmental protection can be met; the preparation method has a wide industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing iron ore hot-pressed carbon-containing pellets. Background technique [0002] The theme of steel industry development is high efficiency, low carbon and green. As one of the most important units of steel production, the blast furnace produces more than 95wt% of pig iron in the world, and its energy consumption and CO 2 Emissions account for about 70% of the entire steel industry. The ironmaking system (including sintering, pelletizing, coking, and blast furnace) consumes the most energy and has a great impact on the environment (mainly CO 2 , dust, etc.). In addition, with the increase of steel production year by year, the demand for raw materials and fuels is also increasing. However, the amount of high-quality mineral resources is limited, and high-grade high-quality raw materials and fuels are exhausted. Therefore, the increase in the...

Claims

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Application Information

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IPC IPC(8): C22B1/245C22B1/212C22B1/214
Inventor 储满生柳政根王宏涛唐珏赵伟冯聪
Owner NORTHEASTERN UNIV
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