SU896073A1 - Blast furnace chute device - Google Patents

Description

one

The invention relates to ferrous metallurgy, namely to exhaust devices for slag, and can be used mainly on blast furnaces equipped with a refinery slag processing plants.

The closest in technical essence and the achieved positive effect to the invention is the device of chutes, including a separation bath, supply, slag removal, iron drain and drain chute, in which the separation bath is installed perpendicular to the longitudinal axis of the casting yard. The specified gutter device does not require a swing drive 1.

However, the rate of slag production in such a chute arrangement is still uncontrollable and fluctuates over a wide range depending on the status of the blast furnace and other factors. In the case of slag processing (granulation, etc.) of slag, the unevenness of its output creates great inconvenience and requires additional investments in the construction and operation of processing plants. The lining of the separation bath in the zone of periodic exposure to the slag melt and the atmosphere quickly goes out of service. In the case of using one separation bath for two tap holes, the cast iron coming through the supply chute located near the slag-chute does not have time to completely separate from the slag and is carried away with the latter.

ten

The purpose of the invention is the uniform production of slag to increase the efficiency of slag processing, increase the service life of the separation bath and increase the degree of iron separation.

15 from slag when using one separation bath for two tap holes.

The goal is achieved by the fact that the device of blast furnace chutes is additionally equipped with a slag bath

20 of which the slag chute is adjacent to the slag chute, and a partition separating the separating bath from the slag, while the partition is made with a slag outlet located

25 in height between the slag-removal and iron-iron gutters below the level of the slag zone, and the separation bath is equipped with a chute for emergency slag overflow. Is dividing

30 bath below the iron level

the gutters are protected by refractory materials, and VIEe - by slag skull

When using one separation bath for two tap holes, the slag bath can be made adjacent to the separation bath between the toes of the supply channels on the opposite side from them.

FIG. 1 shows the device of blast furnace chutes when the separation bath is used for two years; in fig. 2 shows section A-A in FIG. (along the axis of the slag hole)

The gutter arrangement consists of a metal separating bath 1, to which side feed gutters 2 and a slag bath 3 adjoin the side. Separating bath 1 at one end is equipped with a cast iron 4 and drain 5 grooves, as well as a skimmer 6 for separating the iron from the slag. The slag bath 3 adjoins the separating bath 1 between the supply channels 2 on the opposite side from them. In addition, the bath 3 is equipped with a slag chute 7 and is separated from the separation bath 1 by a partition 8 with a slag outlet 9. The latter can be made either of refractory material (graphite) or in the form of a water-cooled tuyere and is located in height between the slag chute 7 and 4 chutes below the slag level. In order for the slag hole 9 to always be in the volume of the superheated slag melt and not quenched, the vertical distance ratio between the slag hole 9 and the slag outlet n by their trench 7 to the difference between the levels of the iron outlet 4 and the slag removal 7 troughs should be in the range of 0.8-0.4. The separator bath is equipped with a chute 10 for emergency slag overflow located on the side opposite to the iron chute 4. The slag bath 3 and the separator bath 1 are closed with a cover 11. The latter has holes 12 through which burners (not shown) are heated to heat the melts. Below the level of the gutter 4, the separation bath 1 is protected by refractory material 13, for example, based on carbon, and above by the slag skull 14.

The device chutes of the blast furnace works as follows.

Separator bath 1 through the supply of 11 m chutes 2 is filled with iron and slag. The cast iron, after its level rises to the iron gutter J, begins to pour over the latter into the cast iron ladle (not shown), and the slag is retained by the skimmer 6, is accumulated in the separation tank 1 above the refractory lining 13 and through the slag outlet 9 in the partition 8, e

slag bath 3. When the slag level in the separation bath 1 and slag bath 3 rises to the level of the slag chute 7, the slag melt in it begins to flow to the processing unit (not shown). At the same time, a slag skull 14 is formed on the metal walls of the separation bath 1 and the slag bath 3, which prevents wear of the metal and reduces the heat loss of the slag melt.

Slag discharge port 9 discharges slag for recycling and, since it is always in the volume of superheated slag melt, it is not quenched.

In the event that a slag outlet 9 fails, a fierce release of smelting products from the furnace or coke accumulation in the separation bath 1, excess slag and coke is removed along chute 10 for emergency discharge of the donkey into the slag ladle (not shown).

At the end of the production of smelting products from the blast furnace, pig iron and slag remain in the separation bath 1, the slag level is determined by the height of the slag chute 7 and the cast iron by the height of the slag layer in the separation bath 1 and the height of the iron chute 4. The level of cast iron in the separation tank 1 does not rise above the level of the gutter 4. Subsequent releases of the smelting products are made into a separation bath 1 filled with cast iron and slag.

Since the slag outlet 9 limits the consumption of the melt, a significant amount of slag accumulates in the separation bath 1 during the output of smelting products, and it continues to be recycled for some time after closing the tap hole.

After opening the taphole of the blast furnace. First, the cast iron that fills the separation bath 1 to the level of the iron chute 4, raises the slag level and causes it to flow through the slag outlet 9. Then the slag begins to enter and accumulates in its upper part . Due to this interaction of the melts, the slag yield to processing is increased, and its continuous production can be organized under appropriate conditions.

The lid 11 shields the heat loss and prevents the solidification of the iron and slag in the separation bath 1 and the slag bath 3. The constant filling of the separation bath 1 and the slag bath 3 with iron and slag reliably protects them with refractory material 13, for example, based on carbon in the iron accumulation zone (following

Claims (3)

Claim 1. The device of the gutters of a blast furnace, including a separation bath, inlet, slag and cast-iron troughs, characterized in that, in order to uniformly discharge slag to increase the efficiency of slag processing and increase the degree of separation of pig iron from slag, the device is additionally equipped with a slag bath, to which adjacent to the slag discharge chute, and a partition separating the separation bath from the slag, while the partition is made with a slag outlet located at a height t ^ between the slag and diverter chugunootvodyaschim troughs below the slag zone, and separating bath equipped with an emergency chute for overflow of the slag. 2. The device pop. 1, characterized in that the slag bath is made adjacent to the separation bath between the inlet grooves on the opposite side from the inlet gutters. 3. The device according to paragraphs. 1 and 2, it is noteworthy that the separation bath is lower, the level of the cast-iron trough, is protected by refractory materials, and above it with a slag skull.