Treatment method for recycling molten steel pouring residue of steel ladle by using iron ladle

Abstract

The invention discloses a treatment method for recycling molten steel injection residues of a steel ladle, which comprises the following steps of: adopting a 120t converter, using a turnover red iron ladle, adding 20-30t of molten iron into the iron ladle before the molten steel injection residues of the recycled steel ladle are injected, then hoisting the iron ladle to a molten steel receiving bay to reinject the molten steel in the residual steel ladle, and injecting the residual molten steel in the residual steel ladle for 3-5 times, the time interval is 2-4 hours and refers to the time from iron adding of the iron ladle to returning of molten steel into the steel ladle, the situation that the time interval is too long, a large amount of residual molten steel in the iron ladle is accumulated in the iron ladle due to low temperature is avoided, and the method is not suitable for residual molten steel injection of the steel ladle with iron oxide larger than or equal to 2% in steel ladle top slag.

Description

Technical Field

[0001] The invention relates to a method for recovering excess molten steel from a steel ladle by using an iron ladle. Background Art

[0002] In the steel smelting industry, whether it is converter steelmaking or electric furnace steelmaking, ladles are used to hold molten steel, and then qualified molten steel is poured into various shapes of billets through continuous casting or mold casting. After the pouring, in order to prevent the slag in the steel from entering the continuous casting tundish or the mold casting mold, the ladle slag detection or the ladle bottom is usually built into an inclined surface. However, it is still impossible to pour all the molten steel, causing losses to the smelting cost. At the same time, there are also many methods for recovering the excess of the ladle, such as recycling it into the ladle, recycling it into the slag pot, etc.

[0003] Problems in recycling excess molten steel in ladle: When the excess molten steel in ladle is returned to the ladle after steel is tapped from the rotary furnace, it is necessary to consider the different steel grades, time matching in rhythm and non-repeatable recycling; when the excess molten steel in ladle is returned to the slag tank or slag basin, there is a problem of increased transportation and recycling costs. Summary of the invention

[0004] The purpose of the present invention is to provide a processing method for recovering excess molten steel in a ladle using an iron ladle, which not only recovers excess molten steel in the ladle but also recovers top slag in the ladle. The recovered excess molten steel in the ladle and top slag are added with a certain amount of molten iron and poured into a converter to reduce production costs.

[0005] The technical solution adopted by the present invention is a method for recovering excess molten steel in a ladle by using an iron ladle. A 120t converter and a circulating red iron ladle are adopted. 20-30t molten iron is added into the iron ladle before recovering excess molten steel in the ladle. The iron ladle is then hoisted to a molten steel receiving span to re-inject the excess molten steel into the ladle. The excess molten steel is re-injected into the ladle 3-5 times with an interval of 2-4 hours, which refers to the time from the addition of iron to the return of molten steel into the ladle, to avoid a time interval that is too long. The excess molten steel in the ladle is likely to condense in the ladle in large quantities due to the low temperature. This method is not suitable for excess molten steel in a ladle with iron oxides ≥2% in the ladle top slag.

[0006] Effect of the invention: After the new method is used, the metal recovery rate of the converter is improved, the converter slag is reduced, and the number of times the slag tank is transported is reduced, which reduces the cost of the steelmaking process and improves the environment. The present invention is applicable to the treatment of excess molten steel in steel plants across the country, which can significantly reduce the cost of the steelmaking process and improve the steelmaking environment, so the application prospect of this technology is optimistic. Implementation

[0007] A method for recovering excess molten steel in a ladle by using an iron ladle, adopting a 120t converter and a circulating red iron ladle, adding 20-30t of molten iron into the iron ladle before recovering excess molten steel in the ladle, then hoisting the iron ladle to the molten steel receiving span to re-inject the excess molten steel into the ladle, and re-injecting the excess molten steel into the ladle 3-5 times with an interval of 2-4 hours, which refers to the time from adding iron to the time from the time when the iron ladle is re-injected into the ladle, to avoid a long time interval, in which a large amount of excess molten steel in the iron ladle is condensed in the iron ladle due to low temperature. This method is not suitable for excess molten steel in a ladle with iron oxide ≥2% in the ladle top slag.

Claims

1. A method for recovering excess molten steel from a ladle using an iron ladle, Features A 120t converter is adopted, and a circulating red iron ladle is used. 20~30t of molten iron is added into the iron ladle before the excess molten steel in the ladle is recovered. Then the iron ladle is hoisted to the molten steel receiving span to re-fill the excess molten steel in the ladle. The excess molten steel is re-filled into the ladle 3-5 times with an interval of 2-4 hours. It refers to the time from the addition of iron to the return of molten steel into the ladle to avoid too long time interval. The excess molten steel in the ladle will condense in the ladle due to the low temperature. This method is not suitable for the refilling of molten steel in the ladle with iron oxide ≥2% in the ladle top slag.