CN101070562A

CN101070562A - Method for producing metallized iron-smelting raw material

Info

Publication number: CN101070562A
Application number: CN 200610078774
Authority: CN
Inventors: 万天骥; 任大宁; 孔令坛; 黄务涤
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-05-12
Filing date: 2006-05-12
Publication date: 2007-11-14
Anticipated expiration: 2026-05-12
Also published as: CN100510120C

Abstract

One kind production method involved the metallized iron-smelting raw material, produce the self-fusible metallized pellet which provide raw material for the blastfurnace and melt separated stove. Its characteristic lies in: take the mixture of ironstone powder, coaldust, flux and bonding as raw materials, the self-fusible metallized pellet production process of taking briquettel or other massive fuel as fuel, the briquettel or other massive fuelas and self-reduction ball group are lamination distributed to the fire grate of two sections types belt types burning machine, dry and preheat material level by sucking in the hot haze, then enter combustion-supporting wind (25 -550 degree C) from below to up, make the CO which was produced by briquettel or other massive fuel, the fuel level temperature reach to 1100 -1,350degree C, it burn second time on the fuel level, the furnace temperature reaches 1400degree C above. The fuel level can produce self-smelting metallized pellet by being dried, preheated, roasted and cooled, the product metallization rate is 50 -85%, except to dry, preheat material level and pre-blast, the haze remaining heat may also use to generate electricity.

Description

A kind of method of producing metallized iron-smelting raw material

Technical field:

The invention belongs to the iron-smelting raw material production field, relate to a kind of iron-smelting raw material metallization process, the production of two-part belt type roasting machine is for blast furnace and the molten self-fluxing nature metallic pellet that divides stove to use as raw material.

Background technology:

Traditional blast furnace raw material comprises lump ore, agglomerate and acid pellet.Iron wherein all is ferric oxide and exists, in blast furnace, need it is reduced into metallic iron, thereby consume necessary coke as reductive agent and supply heat, because the pollution of the in short supply and process of coking of coking coal resource, how saving the promptly so-called reduction coke ratio of coke just becomes the key subjects that ironmaking is produced.Reduce many technical measures of coke ratio, reached high level, last potentiality are very few, it is more and more difficult further to reduce coke ratio again, and blast furnace uses the furnace charge of prereduction, as adding scrap iron, only need melt just, nature can significantly reduce coke ratio and improve output.Crossing goes abroad once does this test, once obtains very good effect, but suffers from the economical and effective technology of not producing prereduced burden, and uses direct-reduced iron (DR1) cost of power supply stove steel-making usefulness too high, and quantity can not satisfy the ironmaking requirement, has to give up halfway.Therefore press for the direct reducing process of exploiting economy practicality, be fuel with the coal exactly specifically, fully without Sweet natural gas and coke, production efficiency is again than higher iron ore prereduction and metallization process, for blast furnace provides partially metallised pellet, as blast furnace and molten stove part and even the whole raw material of dividing.

Summary of the invention:

Technical problem to be solved by this invention is to be unique reductive agent and fuel with coal, makes the metallization of autoreduction pelletizing, the technology that prereduced burden is provided and makes it significantly reduce coke ratio and improve output for ironmaking.

The technical solution adopted in the present invention is, at first make by fine iron breeze or rich ore powder, coal dust, flux and binding agent and be mixed and made into the autoreduction fluxed pellets, divide levels (1) with dry type coal or other patch fuels after the drying, (2) pack on the have grid section two-part belt type roasting machine of (4), form the bed of material of thickness 150～850mm, the priority that is in operation is blown into combustion air (5) by the pre-thermal material layer of the hot flue gas of last suction (17), and wind-warm syndrome is 25～550 ℃.The bed of material is along the reinforced cloth drying section (13) of working direction, preheating section (14), firing section (15) and cooling section (16) blowing cooling back (18) discharging, realization adds thermal reduction and refrigerative whole process, obtain degree of metalization 50～85%, and the high self-fluxing nature metallized pellet of intensity.

The cold wind that gas blower comes out utilizes the waste heat of the useless flue gas of this technology through interchanger, is heated to the temperature of above-mentioned requirements, promptly becomes combustion air (5), deliver to bellows (8) through the air-supply pipeline, by fire grate (4), upwards blast in the bed of material at last, burn, make material layer temperature reach 1100～1350 ℃.Since the oxygen in the combustion air at first with the moulded coal burning, pass in the flue gas of the bed of material with CO ₂Be main, do not cause as-reduced metallic iron to reoxidize.Also produce a large amount of CO in the bed of material simultaneously, enter upper furnace (6) after flowing through the bed of material, wherein CO forms secondary combustion with the hot blast that blasts, and fire box temperature is reached more than 1300～1500 ℃, and the material on heating upper strata makes its temperature improve also corresponding raising degree of metalization.Product of the present invention is as blast furnace and the molten stove raw material that divides, and degree of metalization 50～85%, partial fume waste heat are used for interchanger and produce hot blast and pre-thermal material layer, and all the other are used for generating through waste heat boiler.

Embodiment:

With the fine ore of 68 parts of (weight, down together) iron content 65%, 24 parts of coal dusts are pressed into the autoreduction fluxed pellets after 5 parts of ground fluxes and 3 parts of binding agents mix.

The autoreduction fluxed pellets that is pressed into is added on the belt type roasting machine, and after cloth, drying, preheating, roasting and cooling, the acquisition degree of metalization is 75% self-fluxing nature metallized pellet, and full iron is 75%, basicity 1.2.The wide 1.5m of belt type roasting machine chassis, effectively long 48m, useful area 72m ², hourly output 40t consumes moulded coal 4t, and the cogeneration ability is 3000KW, and yearly capacity is 200,000t.

Description of drawings:

Fig. 1 is belt type roasting machine of the present invention transverse section and process drawing.1 is autoreduction pelletizing ore bed, and 2 is moulded coal or other patch fuel layers, and 3 is the shop fixtures bed of material, and 4 is fire grate, and 5 is hot blast, and 6 is burner hearth, and 7 is furnace roof, and 8 is bellows, and 9 is lower seal, and 10 are top seal.Because burner hearth and on the bed of material to move, and need sealing between fixed bottom bellows and the upper furnace, 11 be the chassis side plate, plays the effect of grade material.12 is exhanst gas outlet.

Fig. 2 is belt type roasting machine of the present invention longitudinal section and process drawing, and 13 is dryer section, and 14 is preheating section, and 15 is firing section, and 16 is cooling section, and 17 for extracting flue gas out, and 18 are the cooling air blast.

Claims

1, the present invention relates to a kind of method of producing metallized iron-smelting raw material, it is characterized in that the production technique mode adopts the two-stage roasting method of segmentation exhausting and blowing, autoreduction fluxed pellets that powdered iron ore, coal dust, flux and binding agent are mixed and made into and moulded coal layering cloth are to the two-part belt type roasting machine, material layer temperature reaches 1100～1350 ℃ after preheating and roasting, product is the self-fluxing nature metallized pellet of degree of metalization 50～85%, as blast furnace and the molten stove iron-smelting raw material that divides.

2, according to claim 1, it is characterized in that autoreduction fluxed pellets and moulded coal or other patch fuel layering cloth are to belt type roasting machine, forming thickness is the bed of material of 150～850mm, be in operation successively by the hot flue gas of top suction and to blast temperature by the bottom be 25～550 ℃ combustion air, make material layer temperature reach 1100～1350 ℃, fire box temperature reaches 1300～1350 ℃, realizes metallization and proof strength.

3, autoreduction pelletizing according to claim 1 is characterized in that adding flux in the batching, produces the self-fluxing nature metallized pellet.

4, method according to claim 1 is characterized in that the fume afterheat that roasting produces, and except a part was used to pre-thermal material layer and air blast, remainder can adopt the waste heat boiler generating.