Method for inhibiting splashing at initial smelting period of converter

Abstract

The invention belongs to the field of convertor steelmaking and in particular relates to a method for inhibiting splashing at an initial smelting period of a converter. The method comprises the following steps: 1) after starting a smelting furnace, lowering an oxygen lance into the converter and blowing through oxygen, wherein a whole lance height has a high-low-low trend; within 3 to 4min in a blowing process, lowering the lance height to a normal smelting lance height of 1550 to 1650mm from 1800 to 1900mm; meanwhile, improving oxygen pressure to 0.85 to 0.88MPa; (2) when blowing for 4 minutes and 10 seconds to 4 minutes and 30 seconds, starting to carry out operation changes including lance lifting, charging and decompression; 3) after step 2) is finished, improving bottom blowing flow;4) after all operations are finished, gradually lowering the lance height, improving the oxygen pressure and receiving the bottom blowing flow; adjusting to levels before the operation changes of step2); then starting to carry out smelting. According to the method provided by the invention, the stability of reaction in a smelting tank at the initial smelting period of the converter is ensured, and the problems that the splashing is generated when metallurgical power in the smelting tank is excessive or the temperature is raised relatively rapidly at an initial blowing period, especially iron-carrying smoking splashing is caused are avoided.

Description

technical field [0001] The invention belongs to the field of converter steelmaking, and in particular relates to a method for suppressing splashing in the early stage of converter smelting. Background technique [0002] Converter splashing is an important cause of metal loss in steelmaking. Since the initial slag formation in the early stage of smelting, the molten metal contains a large amount of gas from the reaction in the furnace. At the same time, the interface between the slag and the molten metal is not clear, and the slag is mixed with more metal components, and the reaction in the furnace proceeds. During the process, if splashing occurs, a large amount of iron-containing slag will be sprayed out of the furnace, resulting in metal loss. In the early stage of smelting, the temperature of the molten pool rises unevenly, and the existing low-temperature dead angle will also cause splashing in the early stage when it collides with the high-temperature area. In order t...

AI Technical Summary

Problems solved by technology

Since the initial slag formation in the early stage of smelting, the molten metal contains a large amount of gas from the reaction in the furnace. At the same time, the interface between the slag and the molten metal is not clear, and the slag is mixed with more metal components, and the reaction in the furnace proceeds. During the process, if splashing occurs, a large amount of iron-containing slag will be sprayed out of the furnace, resulting in metal loss

The temperature of the molten pool rises unevenly in the early stage of smelting, and the existing low-temperature dead angle will also cause splashing in the early stage when it collides with the high-temperature area