Preparation method of converter steelmaking dephosphorizing agent

Abstract

The invention relates to a converter steelmaking dephosphorizing agent and a preparation method thereof. The converter steelmaking dephosphorizing agent is characterized by comprising the following raw materials in percentage by weight: 40-45% of Fe2O3, 45-50% of CaO, 1-4.0% of Al2O3, less than 5.0% of SiO2 and 0-1.5% of CaF2, and the melting point is lower than 1150 DEG C. The preparation method comprises the following steps of: crushing and uniformly mixing the raw materials, smelting the mixture at high temperature of 1200-1550 DEG C, and producing calcium ferrite through a melting reaction; after the calcium ferrite is cooled, processing the produced calcium ferrite into 3-40 mm granules as a practical converter dephosphorizing agent. The converter steelmaking dephosphorizing agent provided by the invention has the advantages of stable dephosphorization effect and low energy consumption, and the content of phosphorus element in steel can be controlled below 0.003%. What's more important, the converter steelmaking dephosphorizing agent does not contain fluorine or contains micro fluorine and has small environmental pollution, long storage life and the like.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a converter steelmaking dephosphorization agent used for removing phosphorus in steel during the converter steelmaking process to reduce the phosphorus content in molten steel and a preparation method thereof. Background technique [0002] Phosphorus is usually a harmful element in steel, because high phosphorus content in steel will cause cold and brittle phenomenon of steel and affect some mechanical properties of steel, so it should be controlled. In the current traditional technology, the phosphorus in steel is generally required to be controlled below 0.012%. With the improvement of the mechanical performance requirements of some steel types, the phosphorus in some pure steels and ultra-low phosphorus steels must be controlled at about 0.005%, or even 0.003% or less. In order to achieve this goal, most steel mills adopt the "double slag method", that is, two ...

AI Technical Summary

Problems solved by technology

This process is currently widely used in domestic and foreign iron and steel enterprises, but requires a lot of equipment and investment, high unit consumption and large temperature loss during the process.