Converter melting slagging method

Abstract

The invention relates to a converter melting slagging method. The method comprises the following steps: step one, after smelting is started and an oxygen lance is ignited, adding a converter flux in two batches, wherein the converter flux is lime and light-burned dolomite, the first batch of converter flux is added for two to three times after the oxygen lance is ignited, and the lance height is controlled to be 150 to 180 cm; step two, after the oxygen lance blows oxygen for 2 to 3 minutes, adding the second batch of converter flux for two to three times, and after the last convert flux is completely added, adopting a lance height of 280 to 300 cm; step four, after 5 to 8 minutes of converter blowing, reducing the lance height to 150 to 180 cm; step five, after 10 to 12 minutes of blowing, lifting the lance height to 280 to 300 cm; step six, executing a catch-carbon lance height of 120 cm until the blowing finishes, wherein the catch-carbon time is not less than 2 minutes; and step seven, taking out the oxygen lance and starting steel tapping. The provided method has the advantages that the consumption of converter flux is reduced; the slag spattering during the converter blowing process is prevented; the final temperature and converter final components of converter blowing can be guaranteed, the work labor is reduced, at the same time the production cost is reduced, and safe operation environment is created for the workers.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for using a converter steelmaking flux in conjunction with an oxygen lance Background technique [0002] In the field of steelmaking, converter slagging fluxes (lime, light-fired, limestone) are all added at one time for slagging smelting. The matching between the oxygen lance position control and the timing of flux addition is poor, and the converter flux addition is too concentrated in actual production operation. , so it is necessary to increase the oxygen lance position for slag melting, but long-term high-oxygen lance position blowing can easily cause explosive metal splashing. [0003] The poor slag melting condition in the converter process often causes the converter oxygen lance to stick to the gun, and the phosphorus content at the blowing end point exceeds the standard, forcing the point blowing operation, which increases the labor intensity, and the high te...

AI Technical Summary

Problems solved by technology

[0002] In the field of steelmaking, converter slagging fluxes (lime, light-fired, limestone) are all added at one time for slagging smelting. The matching between the oxygen lance position control and the timing of flux addition is poor, and the converter flux addition is too concentrated in actual production operation. , so it is necessary to increase the position of the oxygen lance to melt the slag, but blowing at the position of the high oxygen lance for a long time can easily cause explosive metal splashing

[0003] The poor slag melting condition in the converter process often causes the converter oxygen lance to stick to the gun, and the phosphorus content at the blowing end point exceeds the standard, forcing the point blowing operation, which increases the labor intensity, and the high temperature overoxidation of the molten steel at the converter end point; It can also cause unfavorable factors such as too low alkalinity in the final slag of the converter, which affects the control of molten steel composition, greatly increases economic costs, and seriously affects the temperature and composition control of molten steel in the converter