Iron-making method with low grade refractory iron ore and equipment thereof

Abstract

The invention relates to an iron-making method with low grade refractory iron ore, particularly to an iron-making method for low grade refractory iron core and equipment thereof to solve the problems of long procedures and high energy consumption in an existing iron-making method with low grade refractory iron ore. The iron-making method with the low grade refractory iron ore comprises the steps of mixing the low grade refractory iron ore with reduction coal and crushing the iron core and the reduction coal, adding flux, catalyst and water and performing stirring, molding the materials into cuboid blocks, conveying the dried cuboid blocks into a tunnel reduction furnace for solid-state initial reduction; and then conveying the cuboid blocks into a three-phase arc furnace. The low grade refractory iron core and the reduction coal are mixed on the base of calculating coal blending according to C / O=1.2 and further 2-4% carbon is blended in an excess mode; the catalyst is dolomite powder or limestone powder, and the addition amount of the flux is calculated according to the formula of CaO+MgO / SiO2=0.8; the catalyst is salt materials containing sodion and the utilization amount is 3-5% of that of the coal blending amount. The iron-making equipment is additionally provided with a loading section based on an original tunnel reduction furnace and further provided with a conveyer belt and a three-phase arc furnace.

Description

technical field [0001] The invention relates to the field of ironmaking, in particular to ironmaking with low-grade refractory iron ore, in particular to an ironmaking method and equipment for using low-grade refractory iron ore. Background technique [0002] Low-grade refractory iron ore, also known as sluggish iron ore, refers to iron ore (such as hematite, limonite, etc.) that contains less than 45% iron and is difficult to process. It has been proven that the reserves of low-grade refractory iron ore in my country are more than 50 billion tons. At present, the cost of making iron with low-grade refractory iron ore is too high, and low-grade refractory iron ore cannot be effectively utilized. There are also few reports on the method of ironmaking with low-grade refractory iron ore. [0003] CN 201653126 discloses an energy-saving tunnel reduction furnace, which can be used for general reduced iron, that is, ironmaking. It can also be used for ironmaking with low-grade ...

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Problems solved by technology

[0004] The present invention provides a method for solving the problem that the existing method of using low-grade refractory iron ore for ironmaking has a long process flow and high energy consumption, and thus lacks a mature and industrially applicable method for using low-grade refractory iron ore for ironmaking. A method of using low-grade refractory iron ore to make iron, and provide equipment for realizing the method

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