Refining agent for waste iron steelmaking and refining technology

Abstract

The invention discloses a refining agent for waste iron steelmaking. The refining agent comprises following raw materials including, by mass, 40-70 parts of calcium oxide, 20-30 parts of calcium fluoride, 40-60 parts of metal aluminum, 5-30 parts of graphite powder, 10-30 parts of silicon carbide, 5-15 parts of metal magnesium, 5-10 parts of titanium dioxide, 1-3 parts of biomass, 3-6 parts of kaolin and 1-3 parts of sulfonated phenolic resin. A waste iron steelmaking refining technology comprises the following steps that firstly, deoxidation treatment is conducted, in the tapping process, carbon powder is added in a steel ladle, then a deoxidizing agent and active lime are added for deoxidation treatment, sampling is conducted after tapping is finished, and after sampling, a layer of calcium carbide is scattered on the steel slag surface of molten steel; and secondly, refining is conducted, after the steel ladle is transferred into a refining furnace, the refining agent is added in the steel ladle three times, and after refining is finished, the casting technology is conducted. Whole-process control is conducted on the whole refining process, and the refining time can be shortenedwhile the cleanliness and quality of the molten steel are improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a refining agent for scrap iron and steelmaking and an iron and steel refining process using the refining agent. Background technique [0002] In my country, the mainstream production process of steel can be divided into two processes, one is the long process from iron ore and coke to pig iron and then to steel, and the other is the short process from iron-containing waste resources to steel. As we all know, iron ore is a non-renewable resource. At present, as the supply of ordinary iron ore at home and abroad is tight, and the price is gradually rising, a large amount of ordinary iron ore will significantly increase the production cost of ironmaking. Therefore, the use of Smelting iron and steel from waste iron resources has also become the preferred process in the current steelmaking industry. The existing iron-containing waste resources steelmaking...

AI Technical Summary

Problems solved by technology

At present, in order to realize the deoxidation and desulfurization of molten steel and the removal of inclusions in molten steel, two methods are generally used to achieve it. One is process control measures, and the other is to add refining agents to the steel water to participate in refining, thereby reducing the inclusions in steel. content, while the refining agent is helpful for desulfurization and deoxidation of molten steel, protecting the lining of the furnace and coefficient of inclusions in molten steel. In the existing technology, the commonly used refining agents are calcium oxide, trioxide The composition of aluminum and silicon carbide, when using this refining agent for refining, found the following deficiencies, one is that the added refining agent will reduce the heat balance of the refining furnace, the heat needs to be compensated, and a large amount of refining is required, and the other is During the refining process, the output of steel slag is large. After using the refining agent, it is difficult to remove impurities in the molten steel, and a large amount of steel slag and impurities are easy to adhere to the ladle, affecting the quality of molten steel, resulting in insufficient purity of molten steel , which seriously affects the surface quality and performance of cast steel