Recycling method of casting slag

Abstract

The invention relates to a recycling method of casting slag, which comprises the steps that headroom control of a molten iron level in a molten iron jar requires that a distance from a jar port to the level is greater than 500mm; the molten iron jar is fixed at a recycling jar seat by a cross trolley and a molten steel receiving span sequentially; the continuous casting slag is collected by the molten iron jar; the waiting time of the molten iron jar does not exceed 2h; the molten iron jar passes through the cross trolley vehicle and the molten steel receiving span sequentially; molten iron in the molten iron jar is added to converters; converter smelting adopts single-slag operation; and finally molten steel is produced. The recycling method has the advantages that liquid slag recycling is limited by a production rhythm, so that about 10 jars of slag can be recycled every day; the continuous casting liquid slag is recycled to the molten iron jar and then added to the converters, and the liquid slag contains a part of free CaO and Al2O3, so that a part of slag and CaO can be provided; early melting of pre-slag of the converters is facilitated; the adding quantity of lime is reduced; the remnant molten steel after casting is recycled; and the production cost is saved.

Description

technical field [0001] The invention relates to a metallurgical slag recycling method, in particular to a casting residue recycling method. Background technique [0002] Casting slag is an inevitable product in the process of steel production. Casting slag is the process of pouring large tanks in the continuous casting slab production process. In order to prevent the steel slag in the large tank from entering the tundish and polluting the quality of molten steel, it is stopped when the molten steel is about to be cast. Casting, the slag-steel mixture remaining in the large tank. This part of the slag-steel mixture contains a part of molten steel and steel slag. The traditional process is to pour the part of the steel slag mixture directly into the slag tank, and then cool it with water. After cooling to room temperature, the steel slag is separated, and the large pieces of slag steel are sorted out and returned to the steelmaking process for secondary smelting; The steel s...

AI Technical Summary

Problems solved by technology

This recycling method can not only make full use of the remaining molten steel, but also use high-basicity slag to replace part of the LF furnace process slagging material, saving part of the flux cost, but there are certain problems in this recycling method, the clearance control accuracy of molten steel tank needs To strengthen, it is necessary to leave a certain space and volume for the recycled steel slag to ensure a safe headroom for the molten steel tank; for reuse, it still needs a near LF refining process, and for steel plants with many types of refining processes, the applicability is not strong. The utilization rate of slag is not high; there are certain difficulties in production organization, steelmaking and smelting, and production rhythm control require special treatment and deliberate organization, which cannot form normalized and orderly management and promotion

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