Liquid steel pre-deoxidizing technology in steelmaking revolving furnace

Abstract

The invention provides a liquid steel pre-deoxidizing technology in a steelmaking revolving furnace, belonging to the technical field of metallurgical steel making for solving the problem that the common deoxidizing technology of the revolving furnace can not reduce FeO content in the final steel slag of the revolving furnace. The technical scheme is as follows: the technology is carried out on the final liquid steel when revolving furnace semi-steel steel making or revolving furnace liquid-steel steel making. The technology comprises the following steps of: a. at the final smelting of the steel making revolving furnace, adding with carbon-containing deoxidizing materials or silicon-containing deoxidizing materials into slag liquid surface of the revolving furnace; b. after adding the deoxidizing materials into the revolving furnace, injecting nitrogen into the revolving furnace to be taken as power source to carry out pre-deoxidization; and c. after injecting the nitrogen, tapping steel after reaction in the revolving furnace is steady. The technology essentially has the following characteristics of: 1. reducing the corroding of the liquid steel and the steel slag to the furnace lining, the steel tapping hole and the steel ladle of the revolving furnace, and improving service life thereof; 2. reducing alloy materials added in the process of the oxidizing and the steel tappingof the liquid steel with high oxygen content, and improving the absorption of the alloy; and 3. reducing rolling slag or final slag tapping quantity in the process of steel tapping in the revolving furnace; and 4. reducing the yield of oxidation products with high melting point.

Description

technical field [0001] The invention relates to a steelmaking deoxidation technology, in particular to a molten steel pre-deoxidation technology in a steelmaking converter, which belongs to the technical field of metallurgy and steelmaking. Background technique [0002] The vanadium-containing hot metal smelted in the blast furnace is rich in V and Ti resources, and the vanadium-containing hot metal needs to be extracted by the vanadium-extracting converter before steelmaking. A certain amount of coolants such as iron blocks and iron balls need to be added to the vanadium extraction converter for vanadium extraction. After the vanadium extraction operation, V, Ti, Si, Mn and other heating elements are basically oxidized to trace amounts, and the C content is 3.6-3.8 %, the molten iron after vanadium extraction is commonly known as semi-steel. Due to the limitation of insufficient heat for semi-steel in converter smelting, the average dissolved oxygen in the molten steel at ...

AI Technical Summary

Problems solved by technology

Due to the strong oxidation of molten steel and final slag at the end of converter smelting, it also results in poor quality of molten steel, low alloy absorption rate, and low service life of furnace lining ladles.

[0004] Generally speaking, in view of the situation that both the molten steel and the final slag at the end of converter smelting are highly oxidizable, the conventional deoxidation process adopts adding an aluminum-containing deoxidizer to the molten steel tank during the tapping process of the converter molten steel. Although this method can effectively reduce The oxygen content of molten steel, however, cannot reduce the FeO content in the slag at the end of the converter, so it is impossible to avoid the serious erosion of the slag at the end of the converter to the lining of the converter