Adding method of steelmaking slag charge of oxygen converter

Abstract

Provided is an adding method of steelmaking slag charge of an oxygen converter. Selected raw materials include limestone, lime, light-burned magnesian limestone, ferric-oxide dust pellets and steelmaking iron ore, wherein the limestone contains 53%-55% of CaO, the lime contains 90%-92% of CaO and not more than 2.5% of SiO2, the light-burned magnesian limestone contains 28%-32% of MgO and not more than 2.5% of SiO2, the ferric-oxide dust pellets contain 52%-56% of T and Fe, and the steelmaking iron ore contains 61%-63% of T and Fe. The slag charge comprises, by weight, 12%-14% of the limestone, 28%-30% of the lime, 26%-28% of the light-burned magnesian limestone, 14%-16% of the ferric-oxide dust pellets and 15%-17% of the iron ore, and the raw materials of the slag charge are added in batches. Through batch adding of the optimized lime, the optimized dolomite and the other slag charge, the adding method optimizes the process and end point control of slag, reduces the phenomena of process splashing and smoking, and can obviously reduce smelting costs.

Description

technical field [0001] The invention belongs to the steelmaking technology, and in particular relates to a method for mixing and adding slag-making materials for oxygen converter steelmaking. technical background [0002] The raw materials of converter steelmaking are divided into metal materials, non-metal materials and gases. Metal materials include molten iron, scrap steel, ferroalloy, non-metal materials include slagging materials, fluxes, coolants, gases include oxygen, nitrogen, argon, carbon dioxide, etc. Non-metallic materials are materials added in the process of converter steelmaking to remove impurities such as phosphorus and sulfur, and to control the temperature of the steelmaking process. They mainly include slagging materials such as lime and dolomite, flux fluorite, iron oxide scale, etc., and cooling Agent iron ore, scrap steel, etc., carburizer and fuel coke, graphite seeds, coal, heavy oil, etc. [0003] At present, in the existing technology, limestone,...

AI Technical Summary

Problems solved by technology

The problems in doing so are: on the one hand, due to the high oxygen content of iron ore, the carbon-oxygen reaction in molten steel is relatively active, which may easily cause more slag overflow in the early stage of smelting; on the other hand, iron ore With gangue, and the existence of gangue will increase the total amount of slag, and the addition of too much iron ore at one time will cause splashing and smoking

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