High-ore-matching-ratio brown iron ore sintering technology

A technology of limonite and ore blending ratio, which is applied in the field of sintering process of limonite with high ore blending ratio, to achieve the effects of cost reduction, low fuel consumption, and low pulverization

Active Publication Date: 2013-07-24
唐山瑞丰钢铁(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a certain gap compared with developed countries, and the r

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) According to the weight ratio of limonite and iron powder is 6:1, the sintered iron-containing raw materials, fuel, and flux are transported to the sintering batching bin for batching. The weight ratio of each raw material is shown in the following table:

[0029] Limonite Iron concentrate powder iron sheet Dust High return Lime powder dolomite semi charcoal Sintering agent 54 9 3 4 18 6.5 6.2 5.7 0.04

[0030] (2) Primary mixing: primary cylinder mixer to mix the raw materials, the physical water content of the raw materials is controlled at 7.4%, the mixing time is 2 minutes, and the temperature of the mixture is 53°C.

[0031] (3) Secondary mixing granulation: Secondary cylinder mixer granulation, the physical water content of raw materials is controlled at 7.8%, the mixing time is 2.5min, the temperature of the mixture is 55°C, and the content of raw material particles with a particle size above 4mm is greater than 50%.

...

Embodiment 2

[0040] (1) According to the weight ratio of limonite and iron powder is 9:1, the sintered iron-containing raw materials, fuel, and flux are transported to the sintering batching bin for batching. The weight ratio of each raw material is shown in the following table:

[0041] Limonite Iron concentrate powder iron sheet Dust High return Lime powder dolomite semi charcoal Sintering agent 56.5 6.5 5 2 17 6.9 6.3 6.1 0.04

[0042] (2) Primary mixing: The primary cylinder mixer mixes the raw materials, the physical water content of the raw materials is controlled at 7.5%, the mixing time is 2 minutes, and the temperature of the mixture is 55°C.

[0043] (3) Secondary mixing granulation: secondary cylinder mixer granulation, the physical water content of raw materials is controlled at 8%, the mixing time is 2.5min, the temperature of the mixture is 58°C, and the content of raw material particles with a particle size of 4mm or more is greater th...

Embodiment 3

[0052] (1) Batching is carried out according to the weight ratio of limonite and iron fine powder 16:1, and the sintered iron-containing raw materials, fuel, and flux are transported to the sintering batching bin for batching. The weight ratio of each raw material is shown in the following table:

[0053] Limonite Iron concentrate powder iron sheet High return Lime powder dolomite semi charcoal Sintering agent 58 3 8 17.5 7.2 6.5 6.4 0.04

[0054] (2) Primary mixing: primary cylinder mixer to mix the raw materials, the physical water content of the raw materials is controlled at 7.6%, the mixing time is 2.5min, and the temperature of the mixture is 59°C.

[0055] (3) Secondary mixing granulation: Secondary cylinder mixer granulation, the physical water content of raw materials is controlled at 8.1%, the mixing time is 3 minutes, the temperature of the mixture is 62°C, and the content of raw material particles with a particle size of 4 mm or m...

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Abstract

The invention relates to a high-ore-matching-ratio brown iron ore sintering technology. The weight ratio of brown iron ore and powdered iron in raw material proportion is (5-19):1, the moisture content of the first mixing is controlled to be 7%-8%, the mixing time lasts for 2-3minutes, and the temperature of the mixture is 50-62 DEG C; the moisture content of second mixing pelletizing is controlled to be 7-9%, the pelletizing time lasts for 2-3.5minutes, and the temperature of materials is 52-65 DEG C; the thickness of grate-layer materials in distribution is 20mm, and a sintering material layer is 780-900mm thick; the ignition temperature for sintering is1050-1150 DEG C, and the ignition time lasts for 1.8-2.2minutes; and the negative pressure for sintering is 12-15kpa, the machine speed is 0.9-1.2m/min, the vertical sintering speed is 29-34mm/min, the air leakage rate is no more than 40%, the cooling negative pressure is 11-14kpa, the temperature of a cooling section of a sintering machine is reduced to 250 DEG C below. By using the high-ore-matching-ratio brown iron ore sintering technology, energy is saved, consumption is reduced, cost is decreased and benefit is increased.

Description

technical field [0001] The invention relates to a limonite sintering process, in particular to a limonite sintering process with a high ore ratio. Background technique [0002] Since the 1980s, many scholars at home and abroad have carried out comprehensive mechanism research and summary on the application of limonite sintering and gradually mastered the adjustment of water and carbon, machine speed and material layer in the process of high proportion limonite sintering. , ore grade, particle size collocation, powder coke, flux change, sintering heat supplement and other technical countermeasures. [0003] The following quotes are some domestic patent materials for strengthening limonite sintering: [0004] (1) A method for producing sintered ore from highly crystalline hydrolimonite, publication number CN 101608256 A. High physical water and crystalline water limonite, limonite powder, concentrate powder, and returned ore are used as iron-containing raw materials. Weight...

Claims

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Application Information

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IPC IPC(8): C22B1/16
Inventor 李雪松侯朝君刘松孙仕良
Owner 唐山瑞丰钢铁(集团)有限公司
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