Method for increasing tapping quantity of converter

Abstract

The invention discloses a method for increasing the tapping quantity of a converter, which comprises the following specific steps: selecting waste steel: determining the specification and size of the waste steel according to the specification and size of an auxiliary material system of the converter; according to the specification and dimension requirements of the scrap steel, the appropriate scrap steel type is determined in combination with the scrap steel resource condition, and the corresponding scrap steel is selected; selecting a stock bin: selecting a certain overhead stock bin of the converter as a special stock bin for scrap steel; waste steel is conveyed, specifically, the waste steel is conveyed to a converter auxiliary material feeding system, and the waste steel is conveyed to an overhead bunker through the converter auxiliary material feeding system; in the normal smelting process of the converter, the waste steel is adopted as a cooling agent and added into the converter through an auxiliary material feeding system to be matched for steel smelting, the method is suitable for steel smelting, the waste steel with the high yield is adopted as a temperature adjusting agent in the smelting process of the converter, and the addition amount of the waste steel is secondarily adjusted according to the heat balance change of the converter; physical heat and chemical heat of molten iron are fully utilized, waste steel is added as much as possible, and the tapping amount of the converter is increased.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, in particular to a method for increasing the steel output of a converter. Background technique [0002] Scrap steel is a renewable resource that can be recycled infinitely. Compared with the long-process process of producing steel with ore and coking coal, the short-process process of using scrap steel to make steel can greatly save energy and water, and reduce waste gas and waste water. , Waste slag discharge, every ton of scrap steel can save 60% of comprehensive energy consumption, reduce CO, CO2, SO2 and other waste gas emissions by 86%, reduce waste slag production by 72%, and reduce 1.6 tons of carbon dioxide emissions; [0003] Scrap resources are high-quality metal raw materials for steelmaking. The comprehensive benefits of increasing the scrap ratio in converter steelmaking are significant. By reducing the consumption of molten iron and increasing the ratio of scrap stee...

AI Technical Summary

Problems solved by technology

[0004] The existing process of adding scrap steel to the converter mainly adopts the tilting of the converter, the scrap steel hopper is used to directly add the scrap steel into the converter with the crane, or add the scrap steel into the ladle and other devices. Although there are many methods, they are all added before the converter smelting starts. First of all, due to the consideration of changes in the heat balance of the converter, the upper limit of the proportion of scrap steel is usually controlled to ensure the quality and heat balance. During the smelting process, a coolant made of iron-containing materials is added to adjust the heat balance. Because converter smelting is commonly used The coolants used are sludge balls, returned ore, iron ore and other materials with low yield and strong heat absorption capacity, resulting in their yield and addition amount being less than scrap steel, which affects the improvement of converter tapping capacity; secondly , due to the limited capacity of the scrap steel hopper, the maximum loading amount of scrap steel is limited, and the amount of scrap steel loading in individual furnaces is not enough. In order to meet the scrap steel demand of a single furnace, the scrap steel hopper is too full, limited by the diameter of the furnace mouth, which is easy to cause the furnace mouth to be stuck , The time to add steel scrap is prolonged or the steel scrap is added outside the furnace, which will affect the production rhythm and efficiency of the converter. Therefore, it is necessary to explore other ways of adding steel scrap, and use steel scrap to replace the coolant with low yield and strong heat absorption capacity in the converter. It can significantly increase the scrap ratio of the converter and the steel output of the converter

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