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High ratio magnetite sintering method

A sintering method and magnetite technology, which are applied in the field of sintering, can solve the problems of sintering production of difficult ore raw materials, poor spheroidization and high content, and achieve the effects of improving the quality of sintered products, reducing the cost of using ore, and reducing fuel consumption.

Active Publication Date: 2020-06-05
WUKUN STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In sintering production, due to the influence of iron ore resources, the sintering ingredients and sintering process change with the change of raw materials. The applicant is currently using Dahongshan concentrate, which belongs to magnetite, and its alkali metal (potassium and sodium) High content, fine particle size, less than 200 mesh accounts for more than 60%, most of the mineral particles exist in a single state, relatively dense, poor spheroidization, softening and melting temperature range is narrow, increasing the difficulty of sintering
Some domestic steel mills have conducted a lot of research, but because the Dahongshan concentrate used by the applicant has a high alkali metal content, granulation, batching, and sintering are different from other domestic steel mills, it is difficult to apply the existing technology to this ore Raw material sintering production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Prepare the sintered material according to the following mass ratio:

[0035] 14% of Guisha fine ore, 19% of secondary resources, 40.5% of Dahongshan concentrate, 5% of imported South African fine ore, 7% of limestone powder, 5% of dolomite powder, 5% of quicklime powder, and 4.5% of coke powder; In the coke powder, the mass ratio of coke powder with a particle size of ≤3mm is ≥85%;

[0036] The 19% secondary resources are raw materials with the following mass ratios: 58% sintering and returning ore, 16% dedusting ash, 12% oxidation slag, and 14% steelmaking sludge;

[0037] 2) Use the stacker and reclaimer to stack the raw materials in step 1) in a herringbone shape. The stacking sequence is: Guisha fine ore, secondary resources, Dahongshan concentrate, imported South African fine ore, and the stack of each stockpile The number of material layers is 680, the angle of the material pile is 45°, and a mixed ore with basicity R=1.4 and TFe=52.2% is formed;

[0038] 3)...

Embodiment 2

[0042] 1) Prepare the sintered material according to the following mass ratio:

[0043] 10% of Guisha fine ore, 20% of secondary resources, 45% of Dahongshan concentrate, 5% of imported South African fine ore, 8% of limestone powder, 3% of dolomite powder, 5% of quicklime powder, and 4% of coke powder; In the coke powder, the mass ratio of coke powder with a particle size of ≤3mm is ≥85%;

[0044] The 20% secondary resources are raw materials with the following mass ratios: 65% sintered ore return, 20% dedusted ash, 5% oxidized slag, and 10% steelmaking sludge;

[0045] 2) Use the stacker and reclaimer to stack the raw materials in step 1) in a herringbone shape. The stacking sequence is: Guisha fine ore, secondary resources, Dahongshan concentrate, imported South African fine ore, and the stack of each stockpile The number of material layers is 640, the angle of the material pile is 60°, and a mixed ore with basicity R=1.4 and TFe=52.6% is formed;

[0046] 3) Use a stacker-...

Embodiment 3

[0050] 1) Prepare the sintered material according to the following mass ratio:

[0051] 15% of Guisha fine ore, 20% of secondary resources, 40% of Dahongshan concentrate, 8% of imported South African fine ore, 5% of limestone powder, 4% of dolomite powder, 5% of quicklime powder, and 3% of coke powder; In the coke powder, the mass ratio of coke powder with a particle size of ≤3mm is ≥85%;

[0052] The 20% secondary resources are raw materials with the following mass ratios: 65% sintered ore return, 15% dedusted ash, 8% oxidized slag, and 12% steelmaking sludge;

[0053] 2) The raw materials in step 1) are stacked in a herringbone shape with a stacker and reclaimer. The stacking sequence is: secondary resources, Dahongshan concentrate, Guisha fine ore, imported South African fine ore, and the stack of each stockpile The number of material layers is 650 layers, the angle of the material pile is 50°, and a mixed ore with basicity R=1.8 and TFe=52.5% is formed;

[0054] 3) Use a...

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Abstract

The invention provides a high-proportion magnetite sintering method. The high-proportion magnetite sintering method comprise the following steps: preparing a sintered material according to the following mass ratio, namely 10-15% of Guisha powder ore, 19-27% of a secondary resource, 40-50% of Dahongshan concentrate, 5-8% of imported South African powder ore, 5-9% of limestone powder, 3-5% of dolomite powder, 5-7% of quicklime powder and 3-6% of coke powder, altogether 100%; mixing the materials, then sending into a sintering machine, and sintering the mixed materials under the conditions that the running speed of the sintering machine is 1.0-1.3 m / min, the final temperature of the sintering machine is 410-490 DEG C, the tail gas temperature of the sintering machine is 125-145 DEG C and thenegative pressure is 12-15.5 Kpa. By the high-proportion magnetite sintering method, the problems of low spheroidality of the sintered material and low sintered material feeding amount due to the relatively fine grain size of the Dahongshan concentrate are solved, conditions are created for improving the quality of a sintered product and reducing the ore using cost, the fuel consumption is loweredby 10 kg / t, the ore returning rate is reduced by 5%, and the yield is increased by 12%.

Description

technical field [0001] The invention relates to a high-ratio magnetite sintering method, which belongs to the technical field of sintering. Background technique [0002] In sintering production, due to the influence of iron ore resources, the sintering ingredients and sintering process change with the change of raw materials. The applicant is currently using Dahongshan concentrate, which belongs to magnetite, and its alkali metal (potassium and sodium) High content, fine particle size, less than 200 mesh accounts for more than 60%, most of the mineral particles exist in a single state, relatively dense, poor spheroidization, softening and melting temperature range is narrow, which increases the difficulty of sintering. Some domestic steel mills have conducted a lot of research, but because the Dahongshan concentrate used by the applicant has a high alkali metal content, granulation, batching, and sintering are different from other domestic steel mills, it is difficult to app...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16C22B1/24
CPCC22B1/16C22B1/2406
Inventor 王冲徐天龙周攻敏罗易柏承波
Owner WUKUN STEEL