Converter slag forming process for rapid slagging

Abstract

The invention discloses a converter slag forming process for rapid slagging and belongs to the technical field of converter processes for steel production. The converter slag forming process is used for rapid slagging of a converter. According to the technical scheme, in the converter slag forming process, the rotating speed of a fan is reduced before waste molten iron is added into the converter, lime powder of a small particle size is added in advance, and waste caused when lime powder of an extremely small particle size is sucked away by the fan is avoided; in addition, an initial slagging reaction is completed under the impact of the molten iron in the molten iron charging process, the rotating speed of the fan is increased to a normal value after lime powder is added, and lime blocks are added in the converting process. By means of the converter slag forming process, the slagging speed at the earlier smelting stage of the converter is effectively increased, and meanwhile waste caused when lime of an extremely small particle size is sucked away by the fan in the smelting process of the converter is reduced. The converter slag forming process is an innovation, solves the problem that the particle size of lime can not meet both sides, which brings trouble to slagging of the converter for a long term, effectively increases the slag forming speed in slagging of the converter, reduces the lime consumption in the slagging process, lowers production cost and improves the dust removing effect.

Description

technical field [0001] The invention relates to a converter slagging process, which belongs to the technical field of converter processes for iron and steel production. Background technique [0002] Lime is the main slagging material used in steelmaking. It has the ability to dephosphorize and desulfurize, and it is also the most used slagging material. In the converter blowing process, the lime particle size has a great influence on the slagging time. If the lime particle size is too large, Ca with high melting point will be formed around the lime block during smelting. 2 SiO 4 A large amount of lime is wrapped in the material, which affects the melting of lime and greatly reduces the speed of slag formation; if the particle size of lime is too small, it is easy to fly away and be sucked away by the dust removal fan, resulting in waste. Therefore, the lime particle size is generally required to be 5-40mm during slagging. However, the lime is broken due to collision durin...

AI Technical Summary

Problems solved by technology

However, the lime is broken due to collision during transportation, feeding, and feeding, which makes part of the lime particle size smaller. During the converter feeding process, this part of the lime is sucked away by the dust removal fan due to its small particle size, resulting in waste of lime. At the same time, the dust removal pipeline Therefore, a large amount of lime dust is deposited, which seriously affects the dust removal effect of the fan.

To sum up, there is a seemingly contradictory situation in the process of converter slagging at present. On the one hand, the particle size of slag-forming lime should not be too large, so as not to affect the slagging speed, and lime with a smaller particle size must be selected; On the one hand, if the particle size of slag-forming lime is too small, it will be sucked away by the dust collector, causing waste, and at the same time seriously affecting the dust removal effect of the fan

So far, this kind of situation has not been effectively solved, which has seriously affected the slagging speed and production cost of the converter. Therefore, it is very necessary to improve the existing slagging process of the converter to achieve full Good for small particle size lime, reduce production cost and improve dust removal effect

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