Method for recycling residual hot steel slag in continuous casted steel ladle

Abstract

The invention discloses a method for recycling residual hot steel slag in a continuous casted steel ladle. The method is characterized in that in continuous casting production, after steel ladle molten steel is injected into a tundish, molten residual hot steel slag in a steel ladle is poured into a heavy molten iron pot and then are put into a converter with molten iron for steel making. The method enables heat energy, residual steel and residues of residual hot steel slag in a continuous casted steel ladle to be fully used, and reduces steel-making accessory consumption and a steel-making production cost.

Description

technical field [0001] The invention relates to a method for recycling and reusing residual steel residue in a continuous casting ladle injection waste heat state, and belongs to the technical field of steelmaking and continuous casting production. Background technique [0002] In the production process of steelmaking and continuous casting, after the molten steel is refined, the ladle is transported to the continuous casting machine for pouring. When the molten steel in the ladle is basically emptied, the nozzle of the ladle should be closed to prevent the ladle slag from entering the continuous casting tundish, thereby affecting Cleanliness of molten steel and quality of steel. At this time, a certain amount of hot steel slag remains in the ladle. The current conventional treatment process is to pour these steel slags into slag tanks and transport them to steel slag treatment plants. After a series of treatments, they can be reused. Conventional residual steel slag treatm...

AI Technical Summary

Problems solved by technology

[0003] 1) The steel slag transported to the steel slag treatment plant must go through a series of treatments before it can be reused or discarded, which is not only time-consuming and laborious, but also costly;

[0004] 2) The remaining steel and slag are injected into the ladle, and the temperature is as high as about 1550°C, and its heat is not fully utilized;

[0005] 3) The remaining steel slag in the ladle contains about 5-10% (volume) metal, which has not been directly recycled;

[0006] 4) Ladle injection residue has high alkalinity and CaO content, and its residual desulfurization capacity has not been fully and effectively utilized

[0018] 3) As the number of steel slag cycles increases, the CaO content in the slag gradually decreases, and the sulfur capacity decreases, which will affect the desulfurization rate. At this time, the slag disposal operation must also be carried out;