Method for producing low-phosphorous molten iron by high-phosphorous reduced iron

Abstract

The invention provides a method for producing low-phosphorous molten iron by high-phosphorous reduced iron, which takes the high-phosphorous reduced iron as raw material. The method comprises: adding CaO into the high-phosphorous reduced iron, and melting and separating the CaO and the high-phosphorous reduced iron in a melting furnace at the temperature of 1400-1550 DEG C; adding dephosphorizingagents with the mass ratio into the molten iron: 30-50% of CaO, 0-10% of SiO2, 0-20% of FeO, 20-40% of Fe2O3, 5-12% of Al2O3 and 3-10% of CaF2; dephosphorizing 1-3 times at the temperature of 1300-1450 DEG C, and producing the molten iron with different phosphorus content, such as low-phosphorous and ultra-low-phosphorous high quality molten iron; therefore, the method lightens the metallurgical load of a steel refining furnace, reduces the quantity of slag, effectively develops and utilizes low grade high-phosphorous iron ore resource, and solves the problem of contradictory supply and demand of the iron ore resource at present.

Description

Method for producing low-phosphorus molten iron with high-phosphorus reduced iron technical field The invention relates to a method for producing low-phosphorus molten iron by using high-phosphorus reduced iron, which belongs to the technical field of smelting. Background technique In recent years, as the price of imported high-quality iron ore continues to rise, the contradiction of the shortage of raw materials for the production of my country's iron and steel industry has become increasingly prominent, thus restricting the healthy development of my country's iron and steel industry. The development and utilization of low-grade high-phosphorus iron ore resources with abundant domestic reserves is a good supplement to ensure the supply of iron ore resources in my country, and is one of the important ways to alleviate the contradiction between supply and demand of iron ore resources in my country. Low-grade high-phosphorus iron ore can produce low-grade high-phosphorus red...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to provide a process for producing low-phosphorus molten iron with high-phosphorus reduced iron, in order to develop and utilize low-grade high-phosphorus iron ore resources, and solve the current problem of contradiction between supply and demand of iron ore resources