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Thick-bed sintering feed surface-spraying covering agent and spraying method thereof

A technology of covering agent and thick material layer is applied in the field of spraying covering agent and spraying on the sintered material surface of thick material layer, which can solve the problem of uneven heat, and achieve the effects of reducing carbon content, improving strength and reducing thickness.

Inactive Publication Date: 2013-07-24
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the fuel separation technology can reduce the fuel consumption per ton of ore, it cannot solve the problem of uneven heat in the upper and lower parts under the condition of thick material layer sintering

Method used

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  • Thick-bed sintering feed surface-spraying covering agent and spraying method thereof
  • Thick-bed sintering feed surface-spraying covering agent and spraying method thereof
  • Thick-bed sintering feed surface-spraying covering agent and spraying method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0023] Embodiments 1 to 3: The specific preparation steps of spraying the covering agent on the sintered material surface of the thick material layer are as follows:

[0024] (1) Analysis of blast furnace gas ash TFe, C and analysis of iron concentrate, carbon concentrate and tailings after screening, the results are shown in Table 1.

[0025] Table 1: Iron and carbon composition of each ore

[0026]

[0027] It can be seen from Table 1 that after beneficiation of gas ash, iron concentrate with iron grade of 61.28% and recovery rate of 55.48% can be obtained, and carbon concentrate with carbon content of 79.19% and recovery rate of 86.05%. Table 2 is the particle size composition table of the gas ash in the embodiment. It can be seen from Table 2 that the particle size of the gas ash is relatively coarse. After mineral processing, the coarse particles contain high carbon, and the fine particles contain high iron; this embodiment selects carbon fine particles with particle s...

Embodiment 4

[0033] Embodiment 4: The covering agent is sprayed on the sintered material surface of the thick material layer using the following raw material ratio and preparation method.

[0034] Raw material weight percentage distribution: carbon content 45wt%, carbon concentrate ≥100 mesh 70%, sintered ore with a particle size 1-3mm 22%, and expanded beads with a particle size 1-2mm 8%.

[0035] The preparation method is the same as in Examples 1-3.

[0036] The average specific gravity of the covering agent that present embodiment obtains is 0.704t / m 3 .

Embodiment 5

[0037] Embodiment 5: The covering agent is sprayed on the sintered material surface of the thick material layer using the following raw material ratio and preparation method.

[0038] Raw material weight distribution ratio: carbon content 80wt%, carbon concentrate ≥100 mesh 55%, sintered ore with a particle size 1-3mm 30%, expanded beads 15%.

[0039] The preparation method is the same as in Examples 1-3.

[0040] The average specific gravity of the covering agent that present embodiment obtains is 0.77t / m 3 .

[0041] The spraying method of spraying the covering agent on the sintered material surface of the thick material layer is as follows:

[0042] (1) Use a concrete wet spraying machine, model PZS3000, to spray the covering agent into water, and control the mixing moisture to be equal to that of the mixing material, 6.5-7.5wt% moisture.

[0043] (2) Determine the spray flow rate according to the thickness of the spray covering agent:

[0044] The characteristics of he...

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Abstract

The invention discloses a thick-bed sintering feed surface-spraying covering agent and a spraying method thereof. The thick-bed sintering feed surface-spraying covering agent is mixed from the following materials: carbon concentrate, expanded slag balls and sintered return mine. The surface layer temperature of the sintering feed layer, which is sprayed with the covering agent, is higher than the surface layer temperature of the sintering feed layer not added with the covering agent, which is far higher than the ignition temperature of the fuels; the upper layer of the fuels can be continuously combusted after a combustion zone is moved downwards, so that the defect that the heat of the upper sintering feed is insufficient is overcome. The covering agent not only can be used for supplementing the upper heat of the sintering feed layer, but also can be used for achieving the effect of the material surface heat preserving agent and ensuring the good air permeability, so that thickness of the upper material layer without sufficient agglomeration strength is reduced, the yield and the strength are effectively improved, and the total carbon content is reduced, and therefore, the heat of the lower part is free of an excess and super-fusion phenomenon, the sintering machine utilization coefficient, the sinter yield and the strength under the whole thick-bed sintering condition are obviously improved. Moreover, the residual carbon resource in the carbon powder, i.e., the product obtained by gas ash beneficiation, is sufficiently utilized.

Description

technical field [0001] The invention relates to a metallurgical thick material layer sintering technology, in particular to a coating agent and a spraying method for spraying a thick material layer sintered material surface. Background technique [0002] Sintering is one of the main methods to agglomerate iron (fine) ore powder that cannot be directly fed into the blast furnace. By sintering, the metallurgical properties of the raw material can also be improved. Thick bed sintering is an important and widely used sintering technology, which has the advantages of improving sinter strength, increasing yield, and reducing fuel consumption. At present, domestic sintering factories generally adopt thick material layer sintering, and the height of sintering material layer is above 700mm. However, the application of thick material layer sintering technology also faces some difficulties, the most prominent problem is that due to the phenomenon of "automatic heat storage" in the si...

Claims

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Application Information

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IPC IPC(8): C22B1/16
Inventor 李志全贾广如游想琴张红闯郭兰芬郭强吕殿明刘博
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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