Method for steelmaking by using converter

Abstract

The invention discloses a method for steelmaking by using a converter, which comprises the following steps: adding return ores into the converter and adding molten iron; inserting an air spray gun into a converter for air blowing; adding slag making materials, stopping blowing air when the temperature and ingredients of the molten steel meet requirements; and making molten steel in the converter flow into the steel ladle, and adding a deoxidizer into the steel ladle. The return ores are sintered ores accumulated under a blast furnace bin and are far cheaper than waste steel; and because the return ores contain only a small amount of impurities including slit, rust and the like and mainly contain about 30 percent of iron and 50 percent of iron, the return ores can increase the ferric oxidecontent of slag in the later stage of blowing, thereby facilitating slagging and functioning as a fusing assistant. In addition, in the blowing process, the iron in the ores is reduced, so the consumption of oxygen and the iron material is reduced. Therefore, the method for steelmaking by using the converter can improve the steelmaking quality and reduce production cost.

Description

technical field [0001] The invention relates to the field of smelting, and more specifically, to a converter steelmaking method. Background technique [0002] Converter steelmaking uses molten iron, scrap steel, and ferroalloy as the main raw materials. The steelmaking process is completed in the converter by the physical heat of the molten iron itself and the heat generated by the chemical reaction between the components of the molten iron without the aid of external energy. [0003] It can be known from the heat balance calculation that there is a surplus of heat in converter steelmaking. In order to meet the requirements of blowing, a certain amount of coolant needs to be added. Generally, steel scrap is used as the coolant for converter steelmaking, and steel scrap includes two types, medium and heavy steel scrap and light and thin steel scrap. Because it is difficult to purchase medium and heavy steel scrap, light and thin steel scrap is mostly used. [0004] However,...

AI Technical Summary

Problems solved by technology

[0004] However, there are many disadvantages in using light and thin steel scrap as coolant

First of all, there are many impurities such as sediment and rust in light and thin steel scrap, which not only increases the difficulty of smelting, but also reduces the quality of steel; secondly, the price of light and thin steel scrap is relatively high, which is not economical

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