SU392091A1 - GASKETS FOR THE RELEASE OF SLAG FROM THE MAIN GLUTE OF A DOMAIN FURNACE - Google Patents

Description

one

The slag trench of the blast furnace is known, which is a lined ditch connected by means of a slag pass to the main chute located at the cast-iron taphole and equipped with a trap.

Such a chute during operation allows great loss of iron with the lower slag. Thus, studies by UKRNIIMET have shown that usually in large furnaces, the loss of cast iron with bottom slag is 1–10% of the weight of the bottom slag. In some cases (for example, in the process of production of pig iron and slag from the furnace, with parustepii slag pass, etc.), the content of iron in the lower slag can reach 20-40%. This causes not only direct metal losses, but also causes accidents due to the burning of slag-carrying (non-lining) ladles or due to explosions during processing, for example, granulation, of the lower slag.

Various devices for the capture of cast iron from slag are labor-intensive in operation and, as a rule, turn captured iron into scrap, the value of which is 2-3 times lower than the value of smelted iron.

The aim of the invention is to reduce the loss of cast iron with bottom slag.

To do this, in the initial section of the slag trough, at some distance (paprpmer, 1.5-2.5 m) from the slag pass located at the interface of the main and slag trough, a second pass is installed, and a trap, limited to two passes, in the lower part connected by a channel (naprmer, pipe) with the main chute. To improve the flow of iron from slag into the main trough, the bottom of the trap is between two perevalamps and the connecting channel of the sun with an inclination towards the main shaft. For the best

the deposition of iron from the slag section of the gutter in the trap is made wider (nairil er, 1.5–2 times) compared with the rest of its sections.

FIG. 1 shows the proposed chute,

lengthwise cut; in fig. 2 - the same in terms of.

The main trench 1 is connected to the slag trench 2. In the trench 2 there are two passes 3 and 4, of which pass 3 is located

on the border of the iron gutter. The trap 5 of the chute 2 is connected to the main chute by the channel 6.

Works chute as follows.

In the process of casting iron and slag from the blast furnace, slag through pass 3 enters trap 5, where partial precipitation of pig iron takes place (up to 40-50%) - The captured liquid cast iron automatically flows through channel 6 into the main chute and flows into the main mass of metal ladle. After closing the iron notch, the pass 4 is destroyed and the rest of the slag is released from the trap 5.

The proposed trough has the following technical and eco-economic advantages: the trough is simple in design and easy to use; it reduces the loss of iron with bottom slag by 40-50%, which is consistent with some experimental data; the captured metal is automatically added to the bulk of the pig iron; n is a commercial product; To control the amount of captured iron, periodically, before individual releases, channel 6 is closed with a refractory mass, and after the end of release, the iron is removed from the trap 5 and weighed. For these control studies, the cast iron is extracted either in the solid state (by means of a crane) or in the liquid state (by means of lined scoops).

Subject invention

A chute for discharging slag from the main chute of a blast furnace, including a trap for pig iron, characterized in that, in order to reduce the loss of pig iron with slag, the trap, the bottom of which is inclined towards the main chute, is formed by an additional pass located at a distance of 1, 5-2.5 m from the slag pass, and is connected by a channel with the main chute.