SU850664A1 - Device for cast iron and slag outlet from blast furnace - Google Patents

Description

The invention relates to ferrous metallurgy, in particular, to the production of pig iron in blast furnaces and can be used to separate the iron from the donkey during the extraction of metal from the blast furnace. A device for the separation of iron and yishak in the main chute of a blast furnace is known, which contains slag ZY chute, a chute for the production of iron, a skimmer plate, passes for pouring iron and shpak. In this device, a separation (skimmer) plate is installed behind the slag chute in the main slab so that there is a small passage between the bottom of the chute and the edge of the slab for the production of pig iron separated from the slag. To prevent the separating plate from being eroded by liquid iron, it is fired by a refractory brick. At a distance from the dividing plate, a pass for casting iron is installed, which serves to raise the level of iron and slag in the main runner to the level of the slag pass l. The drawbacks of the device for separating the pig iron and slag in the main chute are the low quality of the separation of the iron from the slag and the high height of the passage between the dividing board and the bottom of the chute. A device for separating iron and slag in the main chute is known, comprising a chute for discharging, treating metal and separating furnace sludge, a partition located behind it with a gap mesedu bottom 2j. The high peak of the pass is reduced by making the pass with a slope of 10-45, the high height of the skimmer partition is reduced by making an additional refractory insert in the side wall of the groove, and the quality of iron removal from the slag is increased due to the fact that the skimmer partition is recessed in gutter with the slope of the walls in the longitudinal direction of 10-4. However, the disadvantages of the known devices for the separation of iron and slag in the main chute are also poor-quality separation of the iron from the slag due to slag with the iron in the chute for the production of iron and a high heat release hole and a pass to drain the iron. The presence of a channel in one of the passes and the implementation of a channel with a slope reduces the loss of pig iron with slag, however, the disadvantage of known tech- nical injuries is a high peak at the place of overflow of pig iron from one pass to the trough due to the connection of the protruding part of the pass with liquid iron. The closest in technical essence to the present invention is a device for discharging pig iron and slag from a blast furnace, comprising: a central chute, a chute for discharging pig iron, a dividing plate, passes for pouring iron and an asshole, slag, a hole for lowering the iron residues from the chute. The separator plate and the cast-iron pass are located in the side gutter, which is located at a right angle to the central gutter 3 |. : A significant disadvantage of this device is the low degree of separation of pig iron from slag at the beginning and the end of their production, since at the beginning of production of iron and slag, when the process of settling was not yet completed, the iron did not fill the hole between slab and bottom of the gutter, slag together with the cast iron falls into the gutter for cast iron production, at the end of the cast iron and lilac discharge, the slag layer descends together with the cast iron to the same level as the edge of the slab, also falls with cast iron into the gutter for cast iron production, which is high the height of the pass for cast iron due to corroding ystupayuschey liquid iron parts pass causes a change (decrease) in the level of the saddle, and consequently usyuvn iron in the central groove. The purpose of the invention is to increase the degree of separation of pig iron from slag at the beginning and at the end of their production, preventing the cast iron from breaking down by creating a flat-bottom chuo guna from the pass to the cast iron chute. This goal is achieved by the fact that in a device for the production of iron and slag from a blast furnace, a central chute, a chute for production of iron, a dividing plate, turns to drain the iron and slag and slag removal, the dividing plate is made in the form of a monolithic block with a through channel at the same time, the lower edge of the lower end of the channel is aligned with the bottom of the central chute, and the lower edge of the upper end of the channel with the bottom of the chute for casting iron. FIG. 1 schematically shows a device for the production of iron and slag from a blast furnace, plan view | in fig. 2 is a view along arrow A in FIG. 3 shows a section BB in FIG. 1 in FIG. 4 shows a section B-B in FIG. 1. A device for discharging cast iron and from a blast furnace consists of a central chute 1, a chute 2 for discharging cast iron, a dividing plate 3, a pass 4 for pouring out cast iron and a pass 5 for draining slag and a slag extract 6. The separator plate 3 is made in the form of a monolithic block with a through channel 7 directed at an angle to the bottom 8 of the central groove 1, with the lower edge 9 of the lower end of the channel 7 aligned with the bottom 8 of the central groove 1, and the lower edge 10 of the upper end of the channel 7 - with a bottom 11 of the gutter 2 for the release of cast iron. In the bottom part of the separation plate 3, an opening 12 is made to descend the remains of iron — after the iron and slag is removed from the blast furnace. The separator plate 3 is fixed on top of the plate 13, laterally sandwiched between the wall 14 of the chute 2 for discharging the cast iron and the wall 15 of the central chute 1 and tightly pressed against the protruding part 16 of the chute 2 for pouring the iron. The separation plate 3 is located at an angle to the axis of the central groove 1. A device for extracting iron and slag from the blast furnace works as follows. When pig iron and slag are released from the blast furnace in the central groove 1 to the separation plate 3, metal accumulates to a level determined by the lower edge 10 of the upper end of the channel 7 and the iron is separated from the slag due to the difference in their specific weights. Due to the fact that the separation plate 3 is made as a monolithic block with a through channel 7 directed at an angle to the bottom 8 of the central groove 1, the lower edge 9 of the lower end of the channel 7 is aligned with the bottom 8 of the central groove 1, and the lower edge 10 of the upper end of the channel 7 - with a bottom 11 of the gutter 2 for the release of cast iron ,. The cast iron (as heavier: material) is deposited on the inclined bottom 17 of channel 7, and the slag (as lighter material) is forced out (repelled) by the cast iron. Thus, at the beginning and at the end of the iron and slag discharge, slag does not enter the chute 2 to release iron. During the entire production of pig iron and slag from the blast furnace, almost all of the slag will float to the surface. As it accumulates, the slag is completely withdrawn into slag removal 6 by means of a dividing plate 3. The settled cast iron, having passed through the through channel 7, enters the chute 2 to release cast iron. The remaining iron after the end of the release in the central gutter 1 is lowered through an opening 12 located in the bottom part of the separation plate 3.

In the proposed device, the separation plate 3 is made of a monolithic block, whose height is equal to the height of the central chute 1 and upper cell of the chute 2 for cast iron production, the width is equal to the width of the chute 2 for cast iron production, and the thickness is 600 mm. The diameter of the through channel 7 is selected from the condition of ensuring the minimum resistance to the passage of iron through the channel 7.

It is known that the area of the transverse

channel 7 should be a section S

pop

less than five cast iron-gon channel sections (to create a minimum head in channel 7).

With a cast-iron notch diameter of 150 m, the diameter of the channel 7 of the separation plate 3 is 300 mm. With a decrease in the diameter of the channel 7, the speed of passage of the iron through it increases, which leads to the formation of a funnel and to the slag in the channel 7

With an excessive increase in the thickness of the dividing plate 3, the length of the channel 7 increases, which increases the resistance to the flow of cast iron and increases the pressure produced by different levels of melting before and after the dividing plate 3,

The optimum height of the pass 4 for casting iron is determined from the coupling

. - Htsug 1 2.- XUA1A

And, TitVr UIA

H - the height of the layer of iron and

where is slag to separation plate 3)

h, - the height of the layer of iron

after separation plate 3;

h - the height of the pass 4, the wound to the height of the layer of cast iron to the separation

plates 3; .

T.

- specific gravities of cast iron

Uja

4vr and slag respectively.

and is

7-60-oo-a,

H 7-2 SO

with a height of H 130 CMJ Nd, 60 cm; g / smg 2 g / cm.

To protect channel 7 of the separation plate 3 from the height, the monolith block is made of two halves: the upper and the lower, with a connector along the axis of the channel, which allows it to be replaced quickly and inexpensively.

The proposed device allows, compared with the known, to increase the yield of commercial iron approximately 0.488% per year.

Saving commercial iron in tonnes is approximately. 18,000 tons and in rubles x 920000 rubles.

In addition, the proposed device, in comparison with the known one, is simpler in design, more reliable and easier to operate, it will save money on repairing the pass for cast iron and can be used on any metallurgical units | FOR the separation of smelting products, and various specific weights.

Claims (1)

Invention Formula A device for discharging pig iron and slag from a blast furnace, containing a central chute, a chute for casting iron, slag removal, separation plate, passes for iron and slag, characterized in that, in order to increase the degree of separation of "coal from slag, prevent the height of the pass for cast iron, the separation plate is made as a monolithic block with a through inclined channel, the lower edge of the lower end of which is aligned with the bottom of the central gutter, and the lower edge of the upper end of the channel is aligned with the bottom of the gutter to release the cast iron. Sources of information taken into account in the examination 1, Efimenko G.G. and others. Metallurgists of cast iron. K. 1974, from 366-369, 2, USSR Copyright Certificate 600187, class, C 21 V 5/04, 1978, 3, USSR Author's Certificate No. 336347, class, C 21 B 7/14, 1972.