Method and device for optimizing iron ore through coal-based coking reduction roasting coke magnetic separation

A technology for burning coke and iron ore, which is applied in the field of coal-based direct reduction roasting kiln and mineral optimization, coal-based coking reduction roasting coke magnetic separation optimization of iron ore, can solve the problem that natural raw materials are difficult to meet the needs of large-scale production of direct reduced iron raw materials, gas Based on the problems of industrial production and application of shaft furnace technology and low efficiency of thermal energy recycling, the effect of improving the quality structure and energy structure of steel products, easy promotion, and small investment

Pending Publication Date: 2022-01-28

张雷

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AI-Extracted Technical Summary

Problems solved by technology

[0002] Direct reduced iron is the best and indispensable residual element diluent for smelting high-quality steel; the existing direct reduction process generally requires the raw material of reduced iron to contain Fe>68.5%. Second, although the energy consumption of the existing gas-based shaft furnace reduction process is 355 kg/ton less than the 392 kg/ton energy consumption of blast furnace ironmaking, but the furnace is agglomerated, the material is not smooth, and the thermal process is difficult to control. Unstable operatio...

Abstract

The invention relates to the technical field of energy-saving comprehensive utilization of mineral resources, in particular to a method and device for optimizing iron ore through coal-based coking reduction roasting coke magnetic separation. The device comprises a raw material treatment flue gas waste heat utilization system, a coal-based coking reduction roasting system, a coke separation system, a circulating grinding system, a magnetic separation optimization system and an ash and dust removal system. An optimized iron fine powder product is finally obtained through the steps of raw material treatment, coal-based coking reduction roasting, iron ore reduction catalysis coking coal coking, coke separation, circulating grinding and magnetic separation optimization. The method is suitable for treating various types of iron oxide ores with TFe greater than 38%, coking reduction roasting coke volatile matter less than 1.2% meets the ironmaking and steelmaking requirements, the iron recovery rate is obviously improved, the grade of optimized fine iron powder can reach more than 76% of TFe, the sulfur and phosphorus removal efficiency is greater than 60%, energy is saved by greater than 50%, and the problems of high energy consumption, low reduction efficiency, difficulty in thermotechnical control, unstable product quality and shortage of reduced iron raw materials in the existing process are solved.

Application Domain

Increasing energy efficiencyMagnetic separation +2

Technology Topic

Flue gasMagnetic separation +12

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Examples

Experimental program(3)

Example Embodiment

[0090] Example 1

[0091] An iron oxide ore contains 38.94% iron TFe. Follow these steps:

[0092] (1) Raw material processing: the TFe38.94% iron ore is screened and granulated, heated and dried, crushed and screened to obtain dry iron ore particles with a particle size of 6-40 mm; Drying treatment to obtain dry coke briquettes with a particle size of 45-55 mm; mixing the dry coke briquettes with a particle size of 45-55 mm with iron ore particles with a particle size of 6-40 mm according to a mass percentage of 30% to obtain iron ore particle mixture, mixing The moisture weight percentage of <10%.

[0093] (2) Coal-based coking reduction roasting kiln: fill the coal-based coking reduction roasting test kiln with the iron ore particle mixture; lay the pile in the preheating pool with a thickness of 200-300mm; start the burner in the combustion chamber and heat up Speed ≤ 2°C/min. When the flue gas temperature in the reduction section reaches 900-960°C, start the material guide impeller to feed at 1 revolution/hour. When the flue gas temperature in the reduction section rises to 960-1080°C, adjust the feeding speed to 5-6 rpm, the iron ore mixture falls into the air-cooled tube to cool to 45-55°C after coking, reducing and roasting, and then passes through the material guiding platform and falls into the roasting silo under the control of the material guiding impeller to obtain the coking reduction roasting material .

[0094] (3) Separation of coke: the coke reduction roasting material is separated by a screening magnetic separator to obtain coke with a volatile content of 0.82%, and the quality and strength of coke meet the requirements of steelmaking; at the same time, the reduction material is obtained;

[0095] (4) Circular grinding: the reduced materials are circulated through pulverizer, roller mill→magnetic separator→sieving and extracting machine→elevator→double roller mill to extract dust and remove dust, and get >300 mesh through the screening and extracting machine Restore the material.

[0096] (5) Magnetic separation optimization: The obtained >300 mesh reduced materials are selected by the China Magnetic Concentrator to obtain optimized iron fine powder: Fe78.01%, phosphorus P0.016%, sulfur content 0.019%; other impurities content meets Reduced iron production requirements.

Example Embodiment

[0097] Example 2

[0098] An iron oxide ore contains 56.72% iron TFe. Follow these steps:

[0099] (1) Raw material processing: TFe56.72% iron ore is granulated, dried, crushed and screened to obtain dry iron ore particles with a particle size of 6-40 mm; the prepared coking coal is dried with coking coal briquettes to obtain a particle size of 45 mm ~55mm dry coke briquettes; mix dry coke briquettes with a particle size of 45~55mm at a mass percentage of 30% with iron ore particles with a particle size of 6~40mm to obtain a mixture of iron ore particles, and the water weight percentage of the mixture is <10%.

[0100] (2) Coal-based coking reduction roasting kiln: The iron ore particle mixture is roasted in a coal-based coking reduction roasting test kiln to obtain coking reduction roasting material.

[0101] (3) Separation of coke: the coke reduction roasting material is separated by a sieving magnetic separator to obtain coke with a volatile content of 0.74%, and the quality and strength of the coke meet the requirements of steelmaking; at the same time, the reduction material is obtained;

[0102] (4) Circular grinding: the reduced materials are circulated through pulverizer, roller mill→magnetic separator→sieving and extracting machine→elevator→double roller mill to extract dust and remove dust, and get >300 mesh through the screening and extracting machine Restore the material.

[0103] (5) Magnetic separation optimization: The obtained >300 mesh reduced materials are selected by the China Magnetic Concentrator to obtain optimized iron powder: Fe81.61%, phosphorus P0.017%, sulfur content 0.018%; other impurities content meets Reduced iron production requirements.

Example Embodiment

[0104] Example 3

[0105] A magnetite oxide contains 24.57% iron TFe. Follow these steps:

[0106] (1) Raw material processing: The magnetite with TFe24.57% is granulated, dried, crushed and screened to obtain dry iron ore particles with a particle size of 6-40mm; 45-55mm dry coke briquettes; mix dry coke briquettes with a particle size of 45-55mm at a mass percentage of 30% with iron ore particles with a particle size of 6-40mm to obtain a mixture of iron ore particles, and the water weight percentage of the mixture is <10%.

[0107] (2) Coal-based coking reduction roasting kiln: The iron ore particle mixture is roasted in a coal-based coking reduction roasting test kiln to obtain coking reduction roasting material.

[0108] (3) Separation of coke: The coke reduction roasting material is separated by a screening magnetic separator to obtain coke with a volatile content of 0.79%, and the quality and strength of the coke meet the requirements of steelmaking; at the same time, the reduction material is obtained;

[0109] (4) Circular grinding: the reduced materials are circulated through pulverizer, roller mill→magnetic separator→sieving and extracting machine→elevator→double roller mill to extract dust and remove dust, and get >300 mesh through the screening and extracting machine Restore the material.

[0110] (5) Magnetic separation optimization: The obtained >300 mesh reduced materials are selected by the China Magnetic Concentrator to obtain optimized iron powder: Fe77.59%, phosphorus P0.014%, sulfur content 0.015%; other impurities content meets Reduced iron production requirements.

PUM

Property	Measurement	Unit
Particle size	6.0 ~ 40.0	mm
Particle size	45.0 ~ 55.0	mm

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

reduce wear
Improve dust removal efficiency

Process for manufacturing leadless semiconductor packages including an electrical test in a matrix of a leadless leadframe

ActiveUS20050287709A1reduce test costreduce wear

Owner:ADVANCED SEMICON ENG INC

Method and device for optimizing iron ore through coal-based coking reduction roasting coke magnetic separation

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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