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Method for increasing grade of sinter

A technology of sinter and grade, applied in the field of metallurgical industry, can solve the problem of unrecorded calcium-containing and magnesium-containing smelting flux, etc., and achieve the effects of improving original permeability, reducing production cost, and increasing use value and promotion value.

Inactive Publication Date: 2010-03-10
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There is no report in the existing literature that calcium-containing and magnesium-containing cooked fluxes can replace raw fluxes.

Method used

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  • Method for increasing grade of sinter

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Sintering basicity CaO / SiO2=1.85, the content of TFe is 57%, the index of MgO content is 2.5%, the weight percent of various components in the raw material sees S-1 in Table 1, contains in the various components of raw material See Table 2 for chemical composition percentages.

[0036] Among the raw materials, the particle size of iron-containing raw materials in the range of 0-10mm and 8-10mm is 14%, and the moisture content is 12%. The burning loss rate of quicklime is 18%, and that of the particle size within the range of 0-3mm is 92%. The moisture content of calcium carbide is 25%, and the particle size is 86% within the range of 0-3mm. The moisture content of slaked lime is 27%, and the particle size is 92% within the range of 0-3mm. The burning loss rate of light-burned magnesium oxide powder is 2.44%, and the particle size is 91% in the range of 0-3mm. The particle size of pulverized coal is 80% within the range of 0-3mm, and the moisture content is 12%.

[0...

Embodiment 2

[0047] Sintering basicity CaO / SiO2=1.80, the content of TFe is 57%, the index of MgO content is 2.6%, the weight percentage of various components in the raw material is shown in S-2 in Table 1, contains in the various components of raw material See Table 2 for chemical composition percentages.

[0048] Among the raw materials, the particle size of iron-containing raw materials in the range of 0-10mm, 8-10mm is 10%, and the water content is less than 13%. The burning loss rate of quicklime is 21%, and that of the particle size within the range of 0-3mm is 95%. The moisture content of calcium carbide is 26%, and the particle size is 88% within the range of 0-3mm. The moisture content of slaked lime is 29%, and the particle size is 95% within the range of 0-3mm. The burning loss rate of light-burned magnesium oxide powder is 3%, and the particle size is 94% in the range of 0-3mm. The particle size of pulverized coal is 77% within the range of 0-3mm, and the moisture content is...

Embodiment 3

[0059] Sintering basicity CaO / SiO2=1.85, the content of TFe is 58%, the index of MgO content is 2.0%, the weight percent of various components in the raw material sees S-3 in Table 1, contains in the various components of raw material See Table 2 for chemical composition percentages.

[0060] Among the raw materials, the particle size of iron-containing raw materials in the range of 0-10mm and 8-10mm is 10%, and the water content is 12%. The burning loss rate of quicklime is 20%, and that of the particle size within the range of 0-3mm is 95%. The moisture content of calcium carbide is 28%, and the particle size is 82% within the range of 0-3mm. The moisture content of slaked lime is 28%, and the particle size is 96% within the range of 0-3mm. The burning loss rate of light-burned magnesium oxide powder is 2%, and the particle size is 95% within the range of 0-3mm. The particle size of pulverized coal is 77% within the range of 0-3mm, and the moisture content is 10%.

[006...

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Abstract

The invention discloses a method for increasing grade of sinter, belonging to the metallurgy industry field. The method is used in the production technology of the sinter as follows: in a primary mixing step, roasted flux is used for replacing the existing raw flux in raw materials which comprises the following components according to weight percentage: 70-85% of iron-bearing raw material, 4-6% ofcalcined lime with 75-81% of CaO, 2.5-4.5% of calcium carbide with 65-70% of CaO, 6-8% of slaked lime with 52-54% of CaO, 1-1.5% of light burning magnesium oxide powder with 80-95% of MgO and 3-5% ofSiO2, 5-7% of pulverized coal or coke powder and 30-32% of return fines. The method can effectively increase the grade of sinter and reduce the production cost.

Description

technical field [0001] The invention belongs to the field of metallurgical industry. Background technique [0002] With the rapid development of the steel industry, there are fewer and fewer high-grade iron ores available for sintering, and more and more low-grade, high-Al 2 o 3 The application of iron ore in sintering production has become an inevitable trend. While the basicity of blast furnace slag is determined by the basicity of sinter, high MgO content can improve the fluidity of blast furnace slag. If the sinter basicity and MgO content remain high, this will lead to a decrease in the sinter grade. Relevant studies have shown that: every 1% decrease in the sinter grade will cause a 3% reduction in blast furnace output and a 1.5% increase in coke ratio. Adding more high-grade pellets to maintain the normal production of the blast furnace will inevitably increase the cost per ton of pig iron. [0003] At present, most sintering plants at home and abroad use dolomite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
Inventor 冯红云李军张树华胡平王素平吴志清
Owner 武钢集团有限公司
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