A smelting reduction ironmaking device and method for avoiding re-oxidation of pre-reduced ore

A technology for reducing iron and reoxidation, applied in the field of smelting reduction ironmaking, can solve the problems such as the inability of gas heat to effectively transfer to the reduction zone, the strong corrosiveness of molten iron oxide, and the low secondary combustion rate of gas, etc., so as to prolong the residence time. , The effect of making full use of and improving production efficiency

Active Publication Date: 2017-07-18
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The disadvantages of the one-step method are: first, the molten iron oxide is highly corrosive, which seriously damages the furnace lining and shortens the service life; second, the reduction produces high-temperature gas above 1500°C and excessive CO, and the heat carried by the gas cannot be effectively transferred To the reduction zone, the heat utilization rate of the gas is low
However, the common disadvantage of these two processes is that in order to avoid the re-oxidation of the pre-reduced ore, the secondary combustion rate of the gas in the final reduction furnace is very low, such as less than 10%, resulting in a high fuel ratio.

Method used

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  • A smelting reduction ironmaking device and method for avoiding re-oxidation of pre-reduced ore
  • A smelting reduction ironmaking device and method for avoiding re-oxidation of pre-reduced ore
  • A smelting reduction ironmaking device and method for avoiding re-oxidation of pre-reduced ore

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Experimental program
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Effect test

Embodiment 1

[0029] The raw material used in this embodiment is pellets, and the fuel used is pulverized coal. The chemical composition of the pellets is shown in Table 1, and the chemical composition of the coal powder is shown in Table 2.

[0030] Table 1: Chemical composition of pellets (all components listed in this table are based on mass percentage, TFe is total iron content)

[0031]

[0032] Table 2: Chemical composition (by mass percentage) of pulverized coal:

[0033]

[0034]The temperature of the pre-reduction shaft furnace is set at 850°C, and the pre-reduction pellets with a metallization rate of 90% are directly pressed into the slag layer of the iron-bathed furnace through the pre-reduction charge descending channel, and sprayed to the iron through the middle spray gun and the lower spray gun. The total amount of pulverized coal injection in the bath furnace is 950kg per ton of iron, among which, the coal injection amount of the middle layer spray gun is 90% of the to...

Embodiment 2

[0037] The raw materials used in this embodiment are the same as in Example 1, and the main operation and production parameters are as follows.

[0038] The temperature of the pre-reduction shaft furnace is set at 850°C, and the pre-reduction pellets with a metallization rate of 80% are directly pressed into the slag layer of the iron-bathed furnace through the pre-reduction charge descending channel, and sprayed to the iron through the middle spray gun and the lower spray gun. The total amount of pulverized coal injected in the bath furnace is 1048kg per ton of iron. Among them, the coal injection amount of the middle layer spray gun is 86% of the total coal consumption, and the coal injection amount of the lower layer spray gun is 14% of the total coal consumption. Oxygen is blown through the three layer spray guns The total amount is 583Nm per ton of iron 3 , wherein, the oxygen blowing volume of the upper spray gun is 5% of the total oxygen consumption, the oxygen blowing ...

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Abstract

The invention discloses a smelting reduction ironmaking device and method for avoiding re-oxidation of pre-reduced ore, belonging to the technical field of smelting reduction ironmaking. The smelting reduction ironmaking device adopts the existing shaft furnace and iron-bath furnace as the reduction reactor, and includes: the pre-reduced ore produced by the shaft furnace is transported to the feeding port on the side of the iron-bath furnace body by using the pre-reduction charge descending channel , and further press the charge directly into the iron-bath slag layer, avoiding the re-oxidation of the pre-reduced ore in the upper free space of the iron-bath furnace in contact with the gas, and then the secondary combustion rate of the gas in the free space is not limited. The furnace body of the iron bath furnace is equipped with three-layer spray guns, and the secondary combustion rate and temperature of the gas in the furnace can be adjusted by adjusting the proportion of oxygen blowing and coal injection of the three-layer spray guns, as well as the total amount of oxygen blowing and coal injection. The molten pool inside provides sufficient heat.

Description

technical field [0001] The invention belongs to the technical field of smelting reduction ironmaking, and in particular provides a smelting reduction ironmaking device and method for avoiding re-oxidation of pre-reduced ore. Background technique [0002] The main direction of the development of smelting reduction ironmaking technology is to replace coke with coal and directly apply fine ore resources to achieve the goals of making full use of resources, shortening the process, reducing investment, reducing costs and reducing environmental pollution. According to the degree of pre-reduction of iron-containing raw materials, the smelting reduction ironmaking process can be divided into one-step method and two-step method. The one-step method is to melt the iron-containing raw materials first and then reduce them, such as the Romelt process and the HIsmelt process; the two-step smelting reduction method first pre-reduces the iron ore in a shaft furnace or a fluidized bed, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/14C21B13/02
Inventor 曲迎霞邹宗树邢力勇
Owner NORTHEASTERN UNIV LIAONING
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