SU1715846A1 - Method of charging blast furnace burden material at bin trestle - Google Patents

Abstract

The invention relates to metallurgy, in particular to methods for supplying charge materials to blast furnaces, and can be used in the smelting of iron in ferrous metallurgy. The purpose of the invention is to increase the production efficiency by reducing the formation of a fine fraction of charge materials. The goal is to ensure that the coke is charged in the same way as sinter, namely in the central bins located above the skip mine, and the fine fraction is ejected towards the inclined bridge of the skip hoist . 3 il.

Description

The invention relates to metallurgy, in particular, to methods for supplying charge materials to blast furnaces; Chah and can be used in the smelting of iron in the steel industry.

There is a known method for feeding the charge on a bunker ramp of a blast furnace, according to which the sinter and additives are discharged directly into the storage bins and into the central bins of the sinter. The coke is first discharged on a coke overpass, and then fed by belt conveyors into the coke bunker. Then, the sinter and sintering coke are fed by weighing screens to the weighing. Separated sludge from the sinter is shipped to the ore yard and coke breeze is usually ordered.

However, this method is ineffective, as additional overload. grind the mixture and lead to an increase of-; (sifting out, which is not cost-effective for the production of pig iron

A known method of supplying the charge on a bunker ramp, which includes loading the sinter into the central bunkers located above the skip mine, peripheral supply of coke and additives, screening the fines, weighing, loading and lifting onto the furnace top.

The disadvantage of this method is its low efficiency, since for supplying coke to skips it needs to be overloaded xs bins with feeders to conveyors, which crushes the material and, consequently, leads to an increase in the amount of coke screenings and fines that fall into the blast furnace charge. In addition, the system for cleaning fines requires the supply of sifting through difficult reloading routes, which leads to material losses, dusting and maintenance complications.

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The purpose of the invention is to increase production efficiency by reducing the formation of a fine fraction of charge materials.

The goal is achieved by the fact that the coke is loaded into the central bunkers located above the hopper, and the fine fraction is discharged towards the inclined bridge of the skip hoist.

Figure 1 shows a flow chart of the method; figure 2 - node I in figure 1; in Fig., 3 - cut on

FIG about 1 about

The method is carried out as follows

Bins 1 are filled with agglomerate, bins. - coke, bunker 5 - pellets and additives. Turning on the screens 3 hot agglomerate is sieved and the fine fraction up to 5 mm is removed from it. The large fraction of the agglomerate enters the hopper scales, and the screening fraction goes into the bunker 9. All these operations are performed directly from the central hoppers 1s located above my skip mine sifting out the agglomerates of the bunker 9 is directed along the periphery of the skip we in the direction of the inclined bridge of the skip hoist. Agglomerate accumulated shreds with skip hoists 10 are overloaded into hoppers. 11 and wagons 12 are taken for disposal. Hopper scales t also serve for the supply of cold pellets and additives, which contributes to the cooling of the agglomerate supplied to the same device. To supply these components, feeders 6 hoppers 5 are loaded, cold components of the charge are loaded into hopper scales 7 and specified weighted portions are sent along conveyors 8 to hopper scales. After the required weight and weight of the hopper scales is set, the hopper scales are loaded into the hopper scales. 15 and fed to the collar of the blast furnace. Including the screens 13 sift the coke and remove from it a fraction of up to 25 mm. The coke coarse fraction enters the hopper scales 1 and is withdrawn into the hoppers 16. All these operations are carried out directly from the central hoppers 2 located above the skip mine. The sifting of coke is directed along the periphery of the skip we are in the direction of the inclined bridge of the skip lift. Having copied

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shuys coke breeze using skip hoists 17 is fed along rails 18 and transferred to hoppers 19. | Then, in coaches, 20 coke screenings are taken for recycling. From bunker scales 1 coke is loaded into skip hoists 15 and transferred to the top of the blast furnace.

It is possible to supply and screen out fines of hot sinter and coke together directly from central bins located above the skip mine, it is possible not only to exclude a large amount of equipment for coke or sinter, but also to eliminate excess overloads, reduce the grinding of the charge, and also eliminate the need for large amounts screenings and the loss of valuable and high-quality raw materials associated with this, to increase trifles in the blast furnace charge itself, since it is impossible to eliminate 100% of the fine fraction. The supply of screenings along the periphery of the skip station towards the inclined bridge of the skip elevator not only simplifies the scheme for the supply of screenings, but also reduces the loss of raw materials with spillage during overloading, dusting is eliminated, and working conditions are improved.

At meer. The agglomerate with a temperature of 500CC with a grain size of up to 100 mm is loaded into the hopper 1, and coke with a grain size of up to 80 mm is loaded into the hopper 2. The pellets and additives are loaded into the 5o hopper. The fine fraction in the 0-5 mm agglomerate is about 10%, and the fine fraction of agglomerate up to 5 mm is in the order of 6%.

On screens 3, a fine fraction of sinter was sifted to 5 mm, feeding it into bunker 9, and the oversize product enters hopper scales 4, the sinter of sinter is skipped with skips 10 and transferred to the sinter plant 12 to the sinter plant for disposal.

These same hopper scales load cold components, pellets and additives supplied using feeders 6, hopper scales 7 and conveyors 8 into hopper scales. Then these materials are loaded into skips 15 and fed to the top of the blast furnace.

With the help of screeners 13, coke is sifted, removing from it a fraction of up to 25 mm. The supra product enters the hopper scales I, and the screenings go to the bunker 16 ' Coke breeze with the help of skip hoists 17 are obtained along the guides 18 and loaded into the bunker 19, and then wagons 20 are taken for recycling. From bunker scales And coke is loaded into skip hoists 15 and fed to the top furnace, blast furnace ..

The use of the invention eliminates a large amount of equipment associated with the overload of the raw material and its supply to the skip mine, eliminating additional coke overloads, reducing its grinding, simplifying the sinter and coke sifting scheme, as well as their subsequent utilization.

Claims (1)

Invention Formula The method of delivery on the bunker ramp of the blast furnace, including the loading of sinter into the central bunker, located above the skip mine, loading of coke and additives into the bunker, screening of the fine fraction, weighing, O loading and feeding to the furnace, characterized in that, in order to increase production efficiency by reducing the formation of fine fraction of the charge materials, coke loading is carried out in the central bunkers, located above my skip, and the fine fraction is given towards the inclined bridge of the skip lift  But a crook. blast guechi The axis of the elevator Tsemioi MeAOUv with the agglome -J vt. oo 15 Fi 2 ten Aa Flyovers