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Double-vertical-furnace system and method for producing iron containing product through system

A shaft furnace and product technology, applied in the field of metallurgy, can solve the problems of reducing the comprehensive utilization rate of reducing gas, increasing the requirements for preparing reducing gas, energy utilization rate, etc., so as to improve energy utilization rate, reduce equipment complexity, and reduce emissions Effect

Pending Publication Date: 2018-02-23
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the prior art, the requirements for reduction reaction conditions of vanadium-titanium magnetite are higher than those of iron ore concentrate, which causes a certain problem of energy utilization, and the relatively high top gas pressure has a great impact on the top gas system during the recycling process. Higher requirements for supporting equipment
[0005] In addition, the shaft furnace direct reduction of vanadium-titanium magnetite resources has certain requirements on the composition of the reducing gas, and its hydrogen content is higher than that of the iron concentrate shaft furnace process, which increases the preparation requirements of the reducing gas and reduces the comprehensive utilization of the reducing gas. Rate

Method used

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  • Double-vertical-furnace system and method for producing iron containing product through system

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Experimental program
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Effect test

Embodiment 1

[0050] refer to figure 1 , the joint production system and method are specifically:

[0051] Put vanadium-titanium-magnetite pellets in the first shaft furnace 10, put iron concentrate pellets in the second shaft furnace 20, and mix the fresh reducing gas and the hydrogen-rich gas provided by the hydrogen extraction device in the mixing tank 11 to make the gas composition Meet the requirements of the reaction, so that H 2 / CO ratio is 5, the effective reducing gas (H 2 +CO) volume ratio ≥ 0.90, the mixed gas is passed into the first compressor 12, so that the pressure of the mixed gas reaches 0.7MPa, and then it is passed into the heating furnace 13, and the temperature of the mixed gas is heated to 1050 by the heating furnace 13 °C is passed into the first shaft furnace as the first reducing gas. React in the first shaft furnace 10 to produce vanadium-titanium sponge iron and obtain the first top gas. After the first furnace top gas passes through the first water washing ...

Embodiment 2

[0056] refer to figure 1 , the joint production system and method are specifically:

[0057] Put vanadium-titanium-magnetite pellets in the first shaft furnace 10, put iron concentrate pellets in the second shaft furnace 20, and mix the fresh reducing gas and the hydrogen-rich gas provided by the hydrogen extraction device in the mixing tank 11 to make the gas composition Meet the requirements of the reaction, so that H 2 / CO ratio is 4, effective reducing gas (H 2 +CO) volume ratio ≥ 0.95, the mixed gas is passed into the first compressor 12, so that the pressure of the mixed gas reaches 0.8MPa, then it is passed into the heating furnace 13, and the temperature of the mixed gas is heated to 1000 by the heating furnace 13 °C is passed into the first shaft furnace as the first reducing gas. React in the first shaft furnace 10 to produce vanadium-titanium sponge iron and obtain the first top gas. After the first furnace top gas passes through the first water washing tower 14...

Embodiment 3

[0061] refer to figure 1 , the joint production system and method are specifically:

[0062] Put vanadium-titanium-magnetite pellets in the first shaft furnace 10, put iron concentrate pellets in the second shaft furnace 20, and mix the fresh reducing gas and the hydrogen-rich gas provided by the hydrogen extraction device in the mixing tank 11 to make the gas composition Meet the requirements of the reaction, so that H 2 / CO ratio is 3, effective reducing gas (H 2 +CO) volume ratio ≥ 0.90, the mixed gas is passed into the first compressor 12, so that the pressure of the mixed gas reaches 0.65MPa, then it is passed into the heating furnace 13, and the temperature of the mixed gas is heated to 950 by the heating furnace 13 °C is passed into the first shaft furnace as the first reducing gas. React in the first shaft furnace 10 to produce vanadium-titanium sponge iron and obtain the first top gas. After the first furnace top gas passes through the first water washing tower 14...

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Abstract

The invention discloses a double-vertical-furnace system. The double-vertical-furnace system comprises a first vertical furnace, a heating furnace, a first compressor, a mixing tank, a first washing tower, a pressure reducing tank, a modified heating furnace, a second vertical furnace, a modified heating furnace, a CO2 remover, a hydrogen extraction device, a second washing tower and a hydrogen extraction device, wherein the heating furnace, the first compressor and the mixing tank are sequentially connected with an air inlet of the first vertical furnace through a pipeline, the first washingtower, the pressure reducing tank and the modified heating furnace are sequentially connected with a first furnace top gas outlet of the first vertical furnace, the modified heating furnace, the CO2 remover and the hydrogen extraction device are sequentially connected with a second air inlet of the second vertical furnace through a pipeline, and the second washing tower and the hydrogen extractiondevice are sequentially connected with a second furnace roof gas outlet of the second vertical furnace. The invention further discloses a method for producing the iron containing product through thedouble-vertical-furnace system. By usage of the above device and method, efficient utilization of different iron ore reducing gas raw materials is achieved, comprehensive utilization of resources andenergy is achieved on the basis of a comprehensive optimization reaction system, and finally comprehensive production of multiple metal products is achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a double shaft furnace system and method for producing iron-containing products. Background technique [0002] Gas-based shaft furnace direct reduction ironmaking is the most important non-blast furnace ironmaking method, and its product is direct reduced iron (also known as sponge iron), which is mainly used as raw material for electric furnace steelmaking, and can also be used as a coolant for converter steelmaking. At present, 80% of the total output of direct reduced iron in the world is produced by the gas-based shaft furnace method. At present, the most mature shaft furnace direct reduction ironmaking process is the MIDREX method and the HYL-III method. Both methods in the current equipment have a single shaft furnace with a capacity of more than 1 million tons in operation. Gas-based shaft furnace product sponge iron is a high-quality raw material for electric furnace ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02C21B13/14
CPCY02P10/122C21B13/02C21B13/0073C21B13/146
Inventor 吴道洪刘亮邓君范志辉员晓唐敬坤冯鲁兴韩志彪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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