Production process for metalized burden suitable for blast furnace ironmaking

A production process, a technology of blast furnace ironmaking, applied in the field of iron and steel metallurgy, can solve the problems of high metallization rate and difficulty in achieving it, and achieve the effects of improving environmental protection, reducing production costs, and increasing productivity

Active Publication Date: 2014-08-27
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the rapid cooling of the charge after sintering, it is difficult to achieve a high metallization rate when reducing with reducing gas

Method used

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  • Production process for metalized burden suitable for blast furnace ironmaking
  • Production process for metalized burden suitable for blast furnace ironmaking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Mix the hematite in Table 1, the coke powder in Table 2 and the quicklime in Table 4 according to the ratio of 100:4:2 by weight, mix the three raw materials evenly and add 3% water to fully wet them, The quicklime in it is completely digested to act as a binder.

[0064] The above mixture is briquetted on a double roller briquetting machine, the ball forming pressure is about 20MPa, and the pellet size is 7mm. After the pellets are dried, 7% coke powder is used as fuel, and its composition and particle size are shown in Table 3.

[0065] The sintering machine uses limonite with a particle size of 5-20mm as the base material, and the thickness of the base material is about 20mm. On the base material, evenly distribute the mixture of dry pellets and coke powder fuel, and the thickness of the material layer can be determined according to the sintering capacity.

[0066] The sintering process is performed after the cloth is completed. The ignition temperature is 1050°C,...

Embodiment 2

[0072] The magnetite in Table 1, the anthracite powder in Table 2 and the quicklime in Table 4 are batched according to the ratio of 100:10:4 by weight, and the three raw materials are mixed evenly and fully wetted by adding 5% water, The quicklime in it is completely digested to act as a binder.

[0073] The above mixture is briquetted on a double roller briquetting machine, the ball forming pressure is about 20MPa, and the pellet size is 12mm. After the pellets are dried, 13% coke powder is used as fuel, and its composition and particle size are shown in Table 3.

[0074] The sintering machine uses limonite with a particle size of 5-20mm as the base material, and the thickness of the base material is about 25mm. On the base material, evenly distribute the mixture of dry pellets and coke powder fuel, and the thickness of the material layer can be determined according to the sintering capacity.

[0075] The sintering process is performed after the cloth is completed. The ig...

Embodiment 3

[0081] The hematite in Table 1, the coke powder in Table 2 and the quicklime in Table 4 are batched according to the ratio of 100:25:5 by weight, and the three raw materials are mixed evenly and fully wetted by adding 9% water. The quicklime in it is completely digested to act as a binder.

[0082] The above mixture is briquetted on a double roller briquetting machine, the ball forming pressure is about 20MPa, and the pellet size is 25mm. After the pellets are dried, 20% anthracite powder is used as fuel, and its composition and particle size are shown in Table 3.

[0083] The sintering machine uses limonite with a particle size of 5-20mm as the base material, and the thickness of the base material is about 30mm. On the base material, evenly distribute the mixture of dry pellets and anthracite pulverized fuel, and the thickness of the material layer can be determined according to the sintering capacity.

[0084] The sintering process is performed after the cloth is completed...

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Abstract

The invention discloses a production process for metalized burden suitable for blast furnace ironmaking. The production process comprises the steps of (1) mixing iron ore powder, a reducing agent and a binder according to a mass ratio of 100:4-25:2-5, wherein the reducing agent is one or two selected from coke powder or anthracite duff and the binder is a binder capable of adjusting alkalinity; (2) mixing the above raw materials thoroughly, wetting the mixture by adding water, pressing the uniformly mixed raw materials on a twinroller machine to obtain pellets; (3) mixing the pellets with fuels, carrying out high temperature reduction of the pellets on a belt-type sinter machine, the addition amount of the fuels being 7-20% that of the pellets; and (4) screening sintered products and applying parts fitting to requirements of the metalized burden in blast furnace ironmaking. When in use, the metalized burden obtained by the process can reduce blast furnace coke rate by 10-30%, significantly reduce burden of direction reduction at the lower part of the blast furnace and increase capacity factor of the blast furnace, thereby greatly increasing production rate of the blast furnace and increasing competitive power of a blast furnace ironmaking process.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for producing metallized charge for blast furnace ironmaking. Background technique [0002] Blast furnace ironmaking mainly uses coke and artificial lump iron ore as the main raw materials, and is a mature and efficient ironmaking process. Modern large-scale blast furnace production technology and equipment have been continuously improved, and blast furnaces have achieved high-yield, low-consumption and high-quality ironmaking production indicators. However, the high efficiency and large scale of blast furnaces put forward stricter requirements on the quality of ore and coke (especially the strength of coke). The coke ratio of most blast furnaces in the world is still higher than 400kg / thm. [0003] In view of the long process flow and serious pollution of the traditional blast furnace ironmaking process and the dependence on metallurgical coke, with the goal of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/14C21B5/00
Inventor 张友平徐万仁顾德仁范建峰
Owner BAOSHAN IRON & STEEL CO LTD
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