Technological process for directly producing spongy iron from high-phosphor oolitic hematite

Abstract

A technique method for directly producing spongy iron by using high phosphorus oolitic hematite belongs to the iron making field, and is characterized in that the high phosphorus oolitic hematite is added with a dephosphorizing agent and then is subjected to direct metallization reducing roast by taking coal as a reducing agent, low intensity magnetic separation for raising iron and reducing phosphorus is carried out, thus obtaining the substance with more than 90 percent of iron metal and phosphorus less than 0.08 percent. The invention has the advantages as following: (1) the utilization rate of resource is high, thus shortening the process flow of making raw steel material from iron ore, avoiding from polluting environment in concentrated ore sintering, pelletizing and blast furnace ironmaking in other methods, and having obvious environmental benefits, energy-saving and consumption reduction effects; (2) the technique method is simpler than other methods, the iron raising process and phosphorus reducing process can be completed simultaneously; and (3) coal power with low cost is directly taken as the reducing agent instead of the expensive coke, thus saving the cost in coking process and avoiding from polluting environment; the varieties are simple, the source is rich, the discharging amount of pollutants in the method is less than that in other methods and the pollutants are easy to deal with.

Description

A process for directly producing sponge iron from high-phosphorus oolitic hematite technical field The invention belongs to the field of ironmaking, and relates to a process method of direct metallization reduction roasting of high-phosphorus iron ore and synchronous dephosphorization-weak magnetic separation process, in particular to adding a dephosphorization agent to high-phosphorus oolitic hematite and using coal as a reducing agent. Direct metallization reduction roasting-weak magnetic separation process for increasing iron and reducing phosphorus. Background technique High-phosphorus oolitic hematite is the most widely distributed and most important sedimentary iron deposit in my country's iron ore resources, accounting for about 1 / 9 of the domestic iron ore resources. Because the iron minerals and gangue minerals in the high-phosphorus oolitic hematite are embedded in oolitic particles with extremely fine particle size, and accompanied by collophosite which is diffi...

AI Technical Summary

Problems solved by technology

The purpose of the present invention is to change the existing method to limit the product to the production of iron concentrate for blast furnace ironmaking in view of the problems of high phosphorus content and low iron recovery rate in the existing method for processing high-phosphorus oolitic hematite The idea is to directly obtain a raw material directly used for steelmaking without blast furnace ironmaking from ore, so as to simplify the process flow, save investment cost, save energy and reduce consumption

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