A kind of operation method of converter splashing double slag

Abstract

The invention discloses an operation method for double slag splashing in a converter. The first slag splashing operation to protect the furnace: first lower the oxygen lance to the lower limit position to spray and stir the slag, and a large amount of slag is splashed and left at the bottom of the furnace. The amount of slag is continuously decreasing. At this time, the gun position is gradually increased, and the gun position is raised between 400 and 600mm. When less slag particles are seen flying out of the furnace mouth, the slag splashing ends, and the slag splashing time is controlled at 2-2.5 minutes. The average content of MgO in the slag is 7-8.5%; the second slag splashing furnace protection operation: the second slag splashing first adds a conditioner to the slag: magnesite 5-8kg / ton steel and part of the next furnace smelter Required slag material: 1 / 3-1 / 2 total amount of lime, increase the viscosity of slag, control the oxygen lance to gradually lower the lance to the lower limit, as the slag is splashed and the amount of slag remaining at the bottom of the furnace decreases continuously, at this time it should be gradually Increase the gun position, the gun position is increased by 600-800mm, the slag splashing time is controlled at 1.5-2.0 minutes, and the average MgO content in the slag is controlled at 9.5-10%.

Description

Technical field [0001] The present invention relates to a method of operation of a converter splash. Background technique [0002] The furnace age is a comprehensive technical economic indicator of converter steelmaking. Improve furnace age not only reduces refractory material consumption, improves operating rate, reduces production cost, and contribute to balanced organizational production, and promotes a benign circulation of production. Therefore, the converter furnace age is the goal of multi-year pursuit of steelmaking workers. [0003] The converter furnace lining works at high temperatures and high oxidation conditions, usually in a 0.2 to 0.8 mm / furnace. In order to ensure the normal production of the converter, my country's metallurgical workers have done a lot of work, such as tar dolomite bricks, lightly burning oil, plus slag, stimulating, spraying, shake furnace, etc., so that the furnace age is gradually Raise above 1000 furnaces; enter the 1980s, the converter ge...

AI Technical Summary

Problems solved by technology

The amount of slag obtained from the parts above the slag splash pool at the lowest gun position is the largest, and the amount of slag left at the bottom of the furnace is relatively small. The amount of slag obtained from the slag splash furnace cap and molten pool at high gun positions is very small, which is very important for furnace condition maintenance. unfavorable

The traditional concept of slag splashing gun position control is to splash slag at the lowest gun position, but the furnace cap is easy to rise and the molten steel is not easy to run out. The seams and below the trunnions need to be strengthened, which will affect the furnace type and operating rate of the converter

This slag splashing control mode can adapt to the steel grades whose molten steel is not very oxidizable, and cannot meet the requirements of converter smelting low-carbon steel. The molten steel is highly oxidizable, and the erosion speed at the joints of the molten pool and the furnace bottom is relatively fast. The furnace and gunning methods are basically unable to maintain the joints of the molten pool and the bottom of the furnace continuously