Technological method of ladle slag thermal processing

Abstract

The invention relates to technology of metallurgical slag processing, in particular to a technological method of ladle slag thermal processing. The technological method of the ladle slag thermal processing comprises the following steps that: ladle molten slag enters a roller slag falling area from a funnel, the slag falling area is provided with a steel ball inside, the steel ball rotates with a roller, the molten slag is cooled by the steel ball, the heat of molten steel and the slag is quickly taken by the steel ball, the molten steel and the slag are taken to a water cooling area by the rolling steel ball after being plasticized and solidified, the molten slag and the steel ball are synchronously cooled by water and then discharged to an outer roller body through a lattice type grate bar of the roller, and the molten slag is cooled again by water in the outer roller body and discharged out finally, wherein the slag and steel are separated under the action of the steel ball rolling at a high speed. The technological method can safely, environmentally and rapidly process the high-temperature ladle slag, can achieve the separation of the slag and the steel, and can solve the problem of processing the ladle slag.

Description

technical field [0001] The invention relates to metallurgical slag treatment technology, in particular to a process method for thermal treatment of ladle slag. Background technique [0002] Ladle slag, also called casting residue, is an inevitable product of the continuous casting process. In order to prevent ladle slag from entering the slab and affecting product quality, the amount of steel remaining in the ladle must be controlled in the later stage of casting. The amount of steel remaining in the ladle changes with the requirements of steel quality, such as For a certain enterprise, it is generally controlled at 2-3t / furnace at the initial stage of production. With the improvement of product quality requirements, the amount of steel remaining rises to 5-10t / furnace, plus the amount of mold slag in the ladle, the ladle slag is about It accounts for 3-5% of steel output. The continuous casting ratio in my country in 2004 has reached 95.8%, and the main steel companies hav...

AI Technical Summary

Problems solved by technology

This process solves the problem of large pieces of slag and steel lumps, but the ladle slag is splashed and cooled in a red-hot state, causing great pollution, requiring a large number of concrete grids, and the cost is high. In addition, the slag and steel cannot be separated during the treatment process, which brings troubles for subsequent utilization. to influence

[0006] German patent DE19519284 proposes a method for treating ladle slag, which is to pour high-temperature ladle slag directly into a simple crystallizer according to the cooling principle of the continuous casting machine, so that the ladle slag is rapidly cooled and discharged. Since the ladle slag is a mixture of slag and steel, Not only does it contain molten steel but also a considerable amount of molten slag, and the thermal conductivity of molten slag is very poor. Whether it can be cooled rapidly by the crystallizer is unknown, and there is no report of actual use in this patent

[0007] Due to the high temperature of ladle slag: 1400-1600°C, containing a large amount of molten steel, it is easy to explode when exposed to water. The treatment of ladle slag cannot adopt the water quenching process commonly used in other metallurgical slags, such as hot pouring method, wind quenching method, shallow plate method, stuffy tank method, etc., can only use some of the above-mentioned natural air cooling processes with large pollution, long treatment cycle and high cost. With the continuous development of the iron and steel industry, the treatment of ladle slag has increasingly become an international problem that plagues iron and steel production enterprises.

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