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Gas-based and coal-based combined iron direct reduction method

A technology based on reducing iron and coal, which is applied to furnace types, furnaces, rotary drum furnaces, etc., can solve the problems of low emission, high carbon content, black color of reduced iron, etc., and achieve cost reduction, low reduction temperature, and reduction fast effect

Active Publication Date: 2018-07-20
烟台市红森林节能环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The whole coal-based reduced iron method, the reduced iron product has defects such as high carbon content, high sulfur, black color of reduced iron, high hardness, etc. Hydrogen is produced by decomposing ammonia water to produce hydrogen, and the price of hydrogen in my country is about 2.2 yuan / m 3 Above, tons of DRI need about 680m 3 The cost of the reducing agent alone is 1496 yuan / t per ton of DRI product, and its production cost is very high. Therefore, the gas-based method of direct reduction of iron is currently only suitable for countries with rich natural gas resources such as the Middle East and Russia. Large-scale construction can only be done in regions, but gas-based reduced iron is clean and environmentally friendly, the product contains low carbon, low sulfur, low hardness, low emission, DRI product color is metallic luster (silver gray), and reduced iron products are widely used (can also be used for powder metallurgy, etc.), the country attaches great importance to the development of gas-based reduced iron technology development

Method used

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  • Gas-based and coal-based combined iron direct reduction method
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Examples

Experimental program
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Effect test

Embodiment 1

[0050] A gas-based and coal-based direct reduction iron method, the steps are as follows:

[0051] (1) Raw material processing

[0052] Grind the iron oxide scale of ordinary steel with TFe 73.2% to a fineness of 180 mesh with a pass rate of 100%;

[0053] (2) Addition of reducing agent

[0054] The iron powder in step (1) is added with high-quality charcoal powder (fineness 100-120 mesh, ash content 0.3%, volatile matter 6%, fixed carbon 93.5%) to obtain the reduced material, iron powder and charcoal powder consumption The weight ratio is 82:18;

[0055] (3) Deep restoration

[0056] Put the reduced material in step (2) into a double-barreled air-based flame-baffled rotary kiln with a diameter of ￠219mm×1500mm, use silicon carbide rods to heat through the flame, and use ￠10mm steel pipes at the center of the kiln hood to separate the Pass H2 with a purity of 99.99% 2 and water vapor, the pressures are 1200Pa and 800Pa respectively; the reduction temperature is 870°C, aft...

Embodiment 2

[0060] A gas-based and coal-based direct reduction iron method, the steps are as follows:

[0061] (1) Raw material processing

[0062] Grind the iron ore powder with TFe 69.68% to a fineness of 325 mesh, with a pass rate of 60%, and add flotation carbon powder (fineness 120-160 mesh, ash 0.4%, volatile matter 38%, fixed carbon 61.5%) and Sodium humate, wherein the weight ratio of iron ore powder, petroleum coke powder and sodium humate is 94.5:4:1.5; mix evenly, carry out mixed milling, use a pelletizing disc to make pellets, and sieve out a diameter of ￠2~ Pellets with a particle size of 3mm; dry the pellets at a temperature of 105°C to make their moisture <0.5%;

[0063] (2) Addition of reducing agent

[0064] Add petroleum coke powder (fineness: 120-200 mesh) to the pellets in step (1) to obtain the reduced material. The weight ratio of the pellets to the flotation carbon powder is 85:15, and the weight of the pellets is as follows: (1) Iron ore fines meter;

[0065] (...

Embodiment 3

[0070] A gas-based and coal-based direct reduction iron method, the steps are as follows:

[0071] (1) Raw material processing

[0072] Grinding TFe 69.68% iron ore powder to a fineness of 200 mesh, the pass rate is 65%;

[0073] (2) Addition of reducing agent

[0074] The iron powder in step (1) is added with Shenmu coal flotation carbon powder (fineness 100-120 mesh, ash content 0.4%, volatile content 38%, fixed carbon 61.5%) to obtain the reduced material, iron powder The weight ratio to the amount of toner is 82:18;

[0075] (3) Deep restoration

[0076] Put the reduced material in step (2) into a double-barreled air-based flame-baffled rotary kiln with a diameter of ￠219mm×1500mm, use silicon carbide rods to heat through the flame, and use ￠10mm steel pipes at the center of the kiln hood to separate the Pass H2 with a purity of 99.99% 2 and water vapor, the pressures are 1000Pa and 800Pa respectively; the reduction temperature is 900°C, after 2.3 hours of reduction, ...

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Abstract

The invention belongs to the technical field of ferrous metallurgy and particularly relates to a gas-based and coal-based combined iron direct reduction method. By combining various advantages and disadvantages of a gas-based and coal-based iron direct reduction production technology, the gas-based and coal-based combined composite-type direct reduction method is obtained, the cost of a DRI product is reduced, so that the cost approximates to the production cost of a coal-based DRI product, and the DRI product with the quality equal to that of gas-based reduced iron can be obtained. The reduction temperature is low, the reduction speed is high, the reduction rate eta Fe is larger than or equal to 93% and can even reach up to 99%.

Description

technical field [0001] The invention belongs to the technical field of black metallurgy, and in particular relates to a gas-based and coal-based direct reduction iron method. Background technique [0002] Internationally, direct reduced iron is divided into coal-based method and gas-based method. As the name implies, the coal-based method uses raw materials containing fixed carbon such as coal, coke, semi-coke or even biomass as the reducing medium (reductant), and reduces DRI and other products at high temperatures; the gas-based method uses CO, H 2 In order to reduce the medium (reductant) at high temperature and reduce products such as DRI. [0003] The whole coal-based reduced iron method, the reduced iron product has defects such as high carbon content, high sulfur, black color of reduced iron, high hardness, etc. Hydrogen is produced by decomposing ammonia water to produce hydrogen, and the price of hydrogen in my country is about 2.2 yuan / m 3 Above, tons of DRI need...

Claims

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Application Information

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IPC IPC(8): C21B13/08C21B13/00C22B1/245
Inventor 唐竹胜陶立群唐佳
Owner 烟台市红森林节能环保科技有限公司
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