Iron ore rotary kiln coal-based hydrogen metallurgy process and device thereof

A rotary kiln and iron ore technology, applied in the field of metallurgical thermal energy, can solve the problems of poor production stability, low production capacity, poor applicability of raw fuels, etc.

Pending Publication Date: 2019-09-03
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although direct reduced iron products with a metallization rate of about 90% can be obtained, their inherent defects such as poor applicability of raw materials and fuels, low production capacity, high energy consumption, high cost and poor production stability limit its further development.

Method used

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  • Iron ore rotary kiln coal-based hydrogen metallurgy process and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] (1) Material pelletizing:

[0088] After mixing the iron ore with a particle size of -200 mesh accounting for 65-80%, binder, and liquid phase conditioner in a weight ratio of 100:2:0.5, use a pelletizer 17 to add water to pelletize to obtain a particle size of Φ10- 20mm wet bulb;

[0089] (2) Drying and preheating of pellets:

[0090] Lay the wet bulbs on the grate machine 2, pass the 950°C high-temperature flue gas in the conditioning chamber 13 into the chain grate machine 2 to dry and preheat the wet bulbs, and the exhausted flue gas is dedusted and purified by the dust removal device 10. Exhaust from machine 18; the flue gas is discharged after dust removal and purification;

[0091] (3) Materials enter the kiln:

[0092] The pellets are dried on the grate machine 2 and preheated to 800°C, and the sluggish granular carbon with a particle size of 1-30mm is added to the rotary kiln 1 from the feed end; The discharge end is sprayed to the front and middle of the r...

Embodiment 2

[0098] (1) Material pelletizing:

[0099] Mix the iron ore with a particle size of -200 mesh accounting for 65-80%, binder, and liquid phase conditioner in a weight ratio of 100:3:1, and then use a pelletizer 17 to add water to pelletize to obtain a particle size of Φ10- 20mm wet bulb;

[0100] (2) Drying and preheating of pellets:

[0101] Lay the wet bulbs on the grate machine 2, pass the 1050°C high-temperature flue gas in the tempering chamber 13 into the chain grate machine 2 to dry and preheat the wet bulbs, and the exhausted flue gas is dedusted and purified by the dust removal device 10. 18 exhaust; the flue gas is discharged after dust removal and purification;

[0102] (3) Materials enter the kiln:

[0103] The pellets are dried on the grate machine 2 and preheated to 900°C, and the sluggish granular carbon with a particle size of 1-30mm is added to the rotary kiln 1 from the feed end; The discharge end is sprayed to the front and middle of the roasting area of ​...

Embodiment 3

[0109] (1) Material pelletizing:

[0110] Mix the iron ore with a particle size of -200 mesh accounting for 65-80%, binder, and liquid phase conditioner in a weight ratio of 100:2-3:0.5-1, and then use the pelletizer 17 to add water to pelletize. Get a wet bulb with a particle size of Φ10-20mm;

[0111] (2) Drying and preheating of pellets:

[0112] Lay the wet bulbs on the grate machine 2, pass the 1000°C high-temperature flue gas in the tempering chamber 13 into the chain grate machine 2 to dry and preheat the wet bulbs, and the exhausted flue gas is dedusted and purified by the dust removal device 10. Exhaust from machine 18; the flue gas is discharged after dust removal and purification;

[0113] (3) Materials enter the kiln:

[0114] The pellets are dried on the grate machine 2 and preheated to 850°C, and the sluggish granular carbon with a particle size of 1-30mm is added to the rotary kiln 1 from the feed end; The discharge end is sprayed to the front and middle of ...

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Abstract

The invention discloses an iron ore rotary kiln coal-based hydrogen metallurgy process and a device thereof. The process comprises the steps of material pelletizing, pellet drying and preheating, feeding materials into a kiln, material hydrogen metallurgy roasting, material melting-separating and cooling to obtain a product. According to the process, iron ore reduction takes H2 which is easy to obtain as the main material, and the hot-state intersection of the coal sufficient pyrolysis and iron oxide reduction process is realized; the reaction temperature point of hydrogen metallurgy is low, under the same combustion space temperature, more heat is introduced into a material layer, so that the reduction speed of pellets is accelerated, and the energy consumption of the process is low; theproductivity is greatly improved on the premise of the same heat transfer amount, the reduction speed is high, the productivity is high, and the intrinsic energy conservation, the intrinsic emission reduction and the intrinsic safety are effectively realized.

Description

technical field [0001] The invention belongs to the technical field of metallurgical heat energy, and in particular relates to a coal-based hydrogen metallurgical process of an iron ore rotary kiln and a device thereof. Background technique [0002] Traditional blast furnace ironmaking is a smelting technology that relies on metallurgical coke as a reducing agent and fuel, and its process is a typical carbon metallurgical process. The annual production capacity of blast furnace ironmaking in the world is very large, and there is still a trend of further development. It is necessary to provide a large amount of high-quality metallurgical coke. High-quality metallurgical coke is made from expensive caking coking coal. Coking in the world Coal only accounts for 8-10% of the total coal reserves, and the gradual expansion of blast furnace ironmaking scale will make coking coal more and more scarce. [0003] During carbon metallurgy, the C element in metallurgical coke is destroy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C22B1/02C21B13/08
CPCC22B1/24C22B1/02C21B13/08C21B13/0073Y02P10/20
Inventor 王明华雷鹏飞权芳民张志刚王永刚张红军王建平寇明月马胜军邢德君靳建毅吴振中鲁逢霖仝敬沛卢红山
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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