SU505509A1 - Method of continuous metal processing slag - Google Patents

Description

(54) METHOD FOR CONTINUOUS METAL PROCESSING OF SLAG

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The invention relates to metallurgy, namely to continuous casting of metals.

It is known that the treatment of steel with synthetic slag can reduce the content of sulfur and non-metallic inclusions in steel. Usually, slag treatment is carried out in a casting ladle. There is also a method for treating molten metal in a tundish of the usual construction with calcium carbonate (CaCr) to remove alumina inclusions from steel (see, for example, "Method for removing alumina slag from a crystallizer during continuous casting of Lat. USA CL 164-83 (B22 d 11/00). No. 3718173, head. Aug. 26.71, publ. 27.02.73), which can serve as a prototype of the proposed method).

However, in the known method, it is necessary to introduce an excessive amount of slag due to the developed open surface, i.e., the area of introduction of the strings of steel from the casting ladle.

In order to increase the reactivity of the slag and the corresponding improvement in the quality of the metal in the proposed method, the slag from the chamber every 2-5 minutes is pumped into the tundish in the direction of the location of the drain trough metal level in the intermediate forge 100-300 mm and then drained from it .

According to the proposed method, slag is induced in a chamber separated by a partition from the tundish. A stream of metal from a steel-teeming ladle is fed into this chamber and fresh synthetic slag for metal treatment is brought into the same chamber. Slag composition can be different depending on the purpose of metal treatment with slag, for example, desulfurization of metal and removal of inclusions can be performed using standard ESP slags, for example ANF-7, with the addition of exothermic components in the form of powdered aluminum and nitrate. The slag layer in the chamber is 300-600 mm. In order to update the slag in a special chamber for metal treatment with slag, every 2–5 mnn slag is pumped from the chamber to the intermediate ladle in the direction of the location of the drainage chute in the intermediate ladle. This is achieved by raising the level of the metal in the tundish by 100-300 mm by increasing the supply of metal from the casting ladle, which leads to the discharge of the spent slag from the tundish. The consumption of nlac will be 0.1-0.5% by weight of the metal, i.e., 1-5 kg / t, depending on the efficiency of the slag used.

The spent slag is discharged into the slag for the emergency discharge of metal, the volume of which must be increased accordingly.

The presence of slag in the slag will reduce the sticking of the emergency metal to the walls of the slag, which will give the side polol an effective effect.

The drawing shows an example of the method of continuous slag processing in an intermediate ladle.

In a special slag chamber 1 for treating metal with slag, spun in an intermediate ladle, after filling the intermediate tank with 100-300 mm of metal, a layer of synthetic slag 2 is gradually induced by feeding it through the slag trench 3 thick, different 300-600 mm. Simultaneously with the supply of synthetic slag from the steel-teeming ladle 4, liquid metal 5 is supplied to the slag chamber 1 until the normal filling height of the intermediate ladle 6 with metal equal to 600-700 mm is reached. By additionally feeding metal from the steel teeming ladle into the intermediate ladle, the slag level 2 in the slag chamber 1 is increased by 100-300 mm to the slag channels 7, and the slag is drained into the intermediate ladle 6, from where it flows through the drain channels 8 into the slag tank.

Then, the level of metal and slag is reduced by 100-300 .hm by reducing the supply of metal from the steel-teeming ladle and fresh synthetic slag in the slag chamber 1 is simultaneously injected. After every 2-5 minutes, the operation of raising the level and downloading the waste slag is repeated. . Processed slag. Metal from tundish 6

enters through the elongated glasses 9 into the mold 10,

The presence of a special chamber for metal treatment with slag allows one to direct

it has a significant layer of slag with a relatively low consumption of it, which increases the efficiency of metal treatment with slag compared to processing in common intermediate and steel teeming ladles.

The mucus of the spent slag on the surface of the metal in the tundish increases the duration of the metal to be treated with the slag and reduces the heat loss from the surface, which, according to Skvortsov and

Aki.menko amounts to about half of metal tenon-loss in the intermediate volume of the ladle.

In the case of continuous processing of metal with slag in an intermediate ladle, a multiple decrease in slag consumption is achieved.

compared with the processing of metal slag in a ladle.

Claims (1)

Invention Formula A method of continuous metal slag processing in an intermediate ladle, in which slag is induced in a chamber separated from an intermediate ladle, characterized in that, in order to improve the quality of the metal. The slag from the chamber every 2-5 missions is pumped into the tundish in the direction of the location of the drainage chute by raising the metal level in the intermediate bucket by 100-300 mm, and then is drained from it. burn 10zz 1m . l $ i-s