QDF electric steelmaking process

Abstract

The invention relates to a QDF electric steelmaking process. The process comprises the following steps: uniformly mixing an iron-containing raw material and a powdery reducing agent, and filling each reducing room, wherein the materials are in disperse and uniformly distributed state in the reducing room, and the reducing rooms and the reduced materials are maintained in static states in the reduction process; uniformly heating the materials in the reducing room by using the heat produced by the combustion of fuel and combustion-supporting gas in a combustion room to preform the reduction reaction on the iron-containing raw material and the reducing agent, wherein the reducing room is a narrow one-part form reactor; obtaining heat-state directly reduced iron after the materials in the reducing room are completely reacted, conveying the heat-state directly reduced iron to a charging device through a hot-delivery mode, and hot-filling an electric furnace to obtain molten steel. The process has the obvious advantages of being short in flow, strong in raw material adaptability, non-coke smelting, easy in control of the reduction process, sufficient in inter-process energy utilization, and capable of obviously reducing CO2 discharge; the process is a steelmaking method with shorter process flow, lower investment, lower cost and better environment protection in comparison with a converter steelmaking process.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to an electric furnace steelmaking process. Background technique [0002] With the increase of the amount of iron and steel materials in our country, the amount of scrap steel recycling will continue to increase, and the proportion of molten iron produced by blast furnaces will continue to decrease in the near future, and the short process of scrap steel-electric furnace steelmaking will become a development trend. However, the unstable quality of scrap steel is not conducive to the development of various steel products, and the resources and prices of scrap steel are very unstable. Compared with sponge iron, which has low carbon content, less impurity content, and easy melting, it is more conducive to the production of high-quality steel in electric furnaces. . [0003] According to the type of reducing agent, there are two types of direct reduction processes for...

AI Technical Summary

Problems solved by technology

The above processes all have their own deficiencies. The gas-based reduction process requires high-quality reducing gas resources as a guarantee, the reduction process is difficult to control, has high requirements for raw materials, and insufficient uniformity of reduced products. Coal-based direct reduction furnaces have high raw material requirements, energy Disadvantages such as high consumption, small output, difficult control of the reduction process, low operating rate, and difficulty in large-scale equipment

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