Melting reduction method for iron ore

A technology for iron ore and reducing agent, applied in the field of iron making, can solve the problems of ineffective utilization, large gas volume and high coal quality requirements, and achieve the effects of reducing energy consumption, content and energy consumption.

Inactive Publication Date: 2007-12-26
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an iron ore smelting reduction method aiming at the disadvantages that the existing smelting reduction process has high requirements on coal quality, large amount of gas and cannot be effectively utilized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The present invention is an iron ore smelting reduction method, which mixes a carbonaceous reducing agent and iron ore powder and adds them to the temperature field with a feeding port on the upper part, and the temperature rises rapidly. Since the iron ore powder is in good contact with carbon, the reaction speed Soon, at the same time, the gas generated by gasification and reduction of carbon at high temperature participates in the reduction again, which makes the reaction kinetic conditions more sufficient, and the reaction speed is further accelerated, which can ensure faster reduction of iron ore. Because there is a supplementary heat source outside, carbon can directly participate in the reduction reaction, so even if the gasification rate of carbon slows down, it will not affect the reduction and melting of ore, so there is no performance requirement for the carbonaceous reducing agent participating in the reduction, which will greatly improve The available carbon...

Embodiment 2

[0021] The difference between this example and Example 1 is that the carbonaceous reducing agent is calculated according to the grade of iron ore, the ratio range of carbon to iron is 141kg / tFe-190kg / tFe, and the temperature of the temperature field is 1301°C- 1353°C.

Embodiment 3

[0023] The difference between this example and Example 1 is that the carbonaceous reducing agent is calculated according to the grade of iron ore, the ratio range of carbon to iron is 191kg / tFe-246kg / tFe, and the temperature of the temperature field is 1354°C- 1427°C.

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Abstract

This invention discloses a method for melt reducing iron ore. The present melt-reducing process has the problems of high coal quality requirement, high coal gas amount and low utility. The method in this invention comprises: mixing carbon reductant and iron ore powder, adding into a temperature field, and melting. The ratio of carbon to iron is 140-350 kg C/ton Fe. The temperature of the temperature field is 1300-1500 deg.C. The method has no requirement on the combustibility of the carbon reductant, thus widening the carbon sources for melt reduction. The majority of the carbon reductant takes part in reduction, which can reduce heat loss and energy consumption. The method has such advantages as simple process, no need for combustion supporting gas, low energy consumption, low FeO content in furnace slag, and no corrosion to furnace lining by FeO.

Description

technical field [0001] The invention relates to an iron ore smelting reduction method, which belongs to the technical field of ironmaking. technical background [0002] After a long period of development, blast furnace ironmaking technology has become very mature. However, its strong dependence on metallurgical coke has greatly affected the blast furnace ironmaking in areas lacking coking coal resources. With the increasingly scarce coking coal resources, the price of metallurgical coke is getting higher and higher. On the contrary, the abundant and cheap non-coking coal resources are not fully utilized in ironmaking production. In order to reduce the cost of ironmaking, people have been looking for ways to replace metallurgical coke with other fuels, among which pulverized coal injection, heavy oil injection, and natural gas injection are all relatively effective measures. However, the effect of these measures is limited, and it is impossible to fundamentally solve the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/00
Inventor 岑明进文志军吴杰李勇波李德发
Owner 武钢集团有限公司
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