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Suspended secondary fast reduction process for iron-containing materials and device therefor

A process method and material technology, applied in the field of iron-containing material reduction devices, can solve the problems of low production efficiency, low metallization rate and high cost, and achieve the effects of high production capacity, large mass transfer coefficient and small footprint

Inactive Publication Date: 2009-06-03
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of the combination of the invented equipment and process, the above disclosed patents have problems such as low metallization rate, high energy consumption, low production efficiency and high cost.

Method used

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  • Suspended secondary fast reduction process for iron-containing materials and device therefor
  • Suspended secondary fast reduction process for iron-containing materials and device therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Iron-containing materials: iron ore fine powder; reducing gas: generating gas.

[0040] The process flow of the gas suspension reduction system for iron-containing materials is as follows: figure 1 shown. Iron-containing materials and fine powder materials with a lime particle size range of 1-40 μm are sent from the lifting device 1 to the first-stage heat exchange tube 2, and after fully exchanging heat with the high-temperature reducing gas from the second-stage cyclone preheater 5, they enter the first-stage cyclone Preheater 3; in the first-stage cyclone preheater 3, the suspended iron-containing material particles are separated from the reducing gas and then enter the second-stage heat exchange tube 4, and the gas passes through the fan 17, the dust collector 18, and the waste reducing gas collection system 19 collection, the outlet temperature of the waste reducing gas is 150-300°C; the preheated iron-containing material enters the II-stage heat exchange tube 4, ...

Embodiment 2

[0042] Iron-containing materials: 80% iron ore fine powder, 20% iron-containing metallurgical dust; reducing gas: coke oven gas.

[0043] Such as figure 2 As shown, the coke oven gas enters the gas tank 23 after being preheated by the preheater 26 . The coke oven gas from the coke oven gas preheater 26 replaces the generated gas from the gas generator 25 . The cross section of the heat exchange tubes of the cyclone preheater is circular. Others are the same as embodiment 1.

Embodiment 3

[0045] Iron-containing material: 10%-90% of iron ore fine powder, 90%-10% of iron-containing metallurgical dust; reducing gas: natural gas, which replaces the coke oven gas in Example 2 with natural gas. Others are with embodiment 2.

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Abstract

The invention belongs to the technical field of iron and steel metallurgy and the field of gas-solid heat exchange or thermal reaction, and relates to a suspended reduction process of iron-containing materials and a secondary suspended reduction furnace device for implementing the process. In the injection reducing furnace, the gas phase and the solid phase flow upwards in parallel and the gas phase and the solid phase are in full contact, with large heat-transfer coefficient and large mass-transfer coefficient, so that the iron-containing materials are reduced and dried quickly and the retention time of material granules in the system is greatly shortened. The heat efficiency of the system is greatly increased. The thermal loss is reduced below 1800 kilocalories per kg of reduced iron-containing materials. The suspended reduction process has the advantages of high system stability, compact equipment installation, small size, low investment, high production capacity, high product metallization rate, controllable metallization rate within the range from 85% to 97%, and uniform product quality.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy and the field of gas-solid phase heat exchange or thermal reaction, and specifically relates to an iron-containing material reduction device for rapid heating, rapid reduction and separation of powdery iron-containing materials. Background technique [0002] Since M.Voel-Jorgensen, a Czech engineer, first submitted the patent for heating cement raw meal powder in a cyclone suspension preheater in 1932, the quality and output of cement kilns have been greatly improved, and the heat consumption has been significantly reduced, which has attracted cement technology researchers from all over the world. and device manufacturers' concerns. In the early 1990s, the FIOR company in Venezuela and the VAI Engineering Technology Co., Ltd. in Austria jointly developed the FINMET process. This process uses iron ore powder as raw material and natural gas as the reducing agent to produce direct r...

Claims

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Application Information

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IPC IPC(8): C21B13/14
Inventor 董杰李丰功王学斌曾晖王博
Owner LAIWU IRON & STEEL GRP
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