Converter steelmaking method for increasing scrap steel ratio per ton of steel

Abstract

A converter steelmaking method for increasing the scrap steel ratio per ton of steel comprises the steps of scrap steel preheating, molten iron preparation, scrap steel material preparation, converteroperation, operation after a converter, treatment outside the converter, and the like. According to the converter operation step, scrap steel molten steel, a scrap steel material and molten iron which are added into the converter comprise, by weight, 33-45% of the scrap steel molten steel, 9-12% of the scrap steel material and the balance the molten iron. According to the converter steelmaking method for increasing the scrap steel ratio per ton of the steel, the adding amount of scrap steel per ton of the steel is increased in the premises of ensuring the molten steel quality and meeting thetapping temperature requirements, and meanwhile, the adverse effect of the coal gas preheated scrap steel on the environment is eliminated, so that the scrap steel ratio per ton of the steel is further increased, and the iron loss is greatly reduced; and researches show that the scrap steel ratio per ton of the steel can reach 40% or above in the premise of ensuring normal production and the molten steel quality by adopting the converter steelmaking method.

Description

technical field [0001] The invention relates to an iron and steel smelting method, in particular to a converter steel-making method for increasing the steel scrap ratio per ton of steel, and belongs to the technical field of iron and steel smelting. Background technique [0002] Scrap steel is a clean resource compared to ore, which can be used infinitely. Compared with the production of steel using ore and coking coal, using scrap steel to make steel can greatly save energy and water, and reduce the discharge of waste gas, waste water and waste residue. According to relevant literature research and analysis, 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 residue generation by 72%, and reduce 1.6 tons of carbon dioxide emissions. In addition, with the rapid development of the iron and steel industry in the past ten years, the accumulation of domestic iron and steel has increase...

AI Technical Summary

Problems solved by technology

Using gas scrap preheating to increase the steel scrap ratio per ton is a relatively common method at this stage, but there are the following problems when using gas for scrap preheating (inside the iron ladle / outside the furnace): Preheating, the production organization is complicated; if the scrap steel is preheated outside the furnace, the temperature loss in the process of unloading is relatively large

In addition, harmful substances such as dioxin will be produced during the heating process of scrap steel, which will pollute the environment.

At the same time, affected by the effect of gas preheating, the temperature of scrap steel after preheating is basically maintained at 700-800°C, so it is difficult to greatly increase the scrap ratio per ton of steel