Low-cost slag washing method

Abstract

The invention belongs to the technical field of iron and steel metallurgy and in particular relates to a low-cost slag washing method. The low-cost slag washing method comprises the following steps: producing synthetic slag for slag washing in a steel ladle, obtained by casting molten steel, by utilizing refining slag and a deoxidant; then utilizing the produced solid-state synthetic slag with relatively high temperature for slag washing operation of a steel tapping process of the next heat. The method provided by the invention has a simple technology and is low in cost; the consumption of slag production materials is less and the heat of the refining slag is recycled; smooth production is not influenced; compared with cyclic utilization of heat-state refining slag, the low-cost slag washing method has remarkable advantages. Sulfur is effectively removed.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, in particular, the invention relates to a low-cost slag washing method. Background technique [0002] The slag washing operation in the steelmaking process is to add synthetic slag with strong adsorption and inclusion capacity into the ladle during the tapping process of the converter or electric furnace. During the tapping process, the tapping steel flow impacts the synthetic slag in the ladle and fully stirs , The molten steel is in full contact with the synthetic slag, and the synthetic slag absorbs inclusions and removes [S] in the molten steel, so that the molten steel is purified by slag washing. The slag washing material is rich in CaO and Al 2 o 3 A mixture of calcium aluminate slag and deoxidizer. [0003] In the continuous casting process in steelmaking production, after the molten steel in the ladle is cast, a part of the refining slag will remain in the ladle. At ...

AI Technical Summary

Problems solved by technology

[0003] In the continuous casting process in steelmaking production, after the molten steel in the ladle is cast, a part of the refining slag will remain in the ladle. At present, most steel factories pour the refining slag into the slag basin, and then mix it with the ordinary converter Waste slag is mixed and stacked in the slag yard for treatment, occupying a large amount of land resources. Due to the high content of CaO in the slag, it is difficult to use the slag on a large scale in cement, ceramics and other industries. It is mainly used for road construction, and the selling price is about A few yuan / ton

This treatment method not only seriously pollutes the environment, but also has extremely low utilization value, which wastes a lot of resources in vain.

There are also some steel mills who have done research on the recycling of hot LF furnace refining slag. However, due to the large amount of refining slag in each furnace, the amount of slag is about 20-30kg / ton of steel. All these hot LF furnace refining slags Pouring into the ladle of the next heat will cause problems such as large amount of slag and difficulty in sampling, and because there is sometimes a deviation between the casting of the molten steel tank and the time node of the converter tapping, it is difficult to fix the recovery of the refining slag at a specific point. The process point of production organization is difficult, and the process of pouring the refining slag from the molten steel ladle into the next furnace ladle brings great inconvenience to the organization and operation of the traffic, and even requires additional traffic