Method and device for making iron with hydrogen

A hydrogen and hydrogen-rich technology, applied in the direction of microwave heating, can solve the problems of inability to realize pure hydrogen smelting, carbon emissions, etc., and achieve the effect of increasing activation energy, reducing consumption, and uniform heating

Active Publication Date: 2022-03-29
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the technical problems existing in the prior art, the present invention provides a method and device for ironmaking with hydrogen, which irradiates low-grade iron ore, titanium concentrate, iron concentrate and other ore raw materials with microwaves to realize the promotion of hydrogen enrichment or The method of pure hydrogen ironmaking can at least solve one of the following technical problems in the prior art: 1. The problem that pure hydrogen smelting cannot be realized; 2. The problem that fossil fuels are needed to provide energy in hydrogen-rich smelting and thus cause carbon emissions

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  • Method and device for making iron with hydrogen

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Effect test

Embodiment 1

[0061] A method of microwave pure hydrogen gas ironmaking, comprising the following steps:

[0062] Step 1. Weigh 200g of ilmenite, 8g of sodiumizing agent, 8g of additive silicon carbide, among the sodiumizing agent: 2g of sodium silicate, 3g of sodium chloride, and 3g of sodium borate.

[0063] Step 2, adopt method one of pretreatment method to carry out ore raw material pretreatment:

[0064] Titanium concentrate particle size below 200 mesh accounts for 75% - 80%. Grind it to prepare ilmenite-containing fine powder with a particle size of 4mm, and dry the prepared ilmenite-containing fine powder at a drying temperature of 100°C for a drying time of 3 hours.

[0065] Step 3. Make silicon carbide into a sheet and lay it on the bottom of the crucible, mix sodium silicate, sodium chloride, sodium borate and ferro-titanium powder into the crucible in the reactor, first pass nitrogen protection, and use microwave The irradiation power is 1kw, the frequency is 2.45GHZ, and the ...

Embodiment 2

[0071] A method for making iron with microwave hydrogen-rich gas, comprising the following steps:

[0072] Step 1. Weigh 200g of iron ore and 40g of carbon powder (carbonaceous reducing agent), weigh 6g of sodium hydroxide (sodiumizing agent) and store it dry, and weigh 7g of zinc oxide (additive) soot.

[0073] Step 2, adopt the side two of pretreatment method to carry out iron ore pretreatment:

[0074] Crush and grind the iron ore to below 200 mesh and mix it with carbon powder, use sodium silicate as a binder to make pellets with a diameter of 3 cm, and dry the prepared pellets at 120°C for 4 hours.

[0075] Step 3, mix the pellets, sodium hydroxide (sodiumizing agent) and zinc oxide (additive) obtained in step 1 and add them into the crucible, first feed nitrogen protection, and use microwaves to irradiate with a power of 2kw and a frequency of 2.45GHZ, measure the temperature with an infrared thermometer, stop feeding nitrogen when the temperature in the reactor reaches...

Embodiment 3

[0079] A method of microwave pure hydrogen gas ironmaking, comprising the following steps:

[0080] Step 1, take by weighing 200g of iron ore concentrate, 11g of additive graphite powder, 8g of sodium hydroxide;

[0081] Step 2, adopt method one of pretreatment method to carry out ore raw material pretreatment:

[0082] The particle size of iron ore concentrate is below 200 mesh, accounting for 75%-80%. Grind it to prepare iron-containing fine powder with a particle size of 5mm, and dry the prepared iron fine powder at a drying temperature of 115°C for a drying time of 2.5 hours.

[0083] Step 3. Mix the additive graphite powder, sodium hydroxide sodium hydroxide and iron fine powder into the crucible, first pass nitrogen protection, use microwave irradiation power of 0.8kw, frequency of 2.45GHZ, measure with infrared thermometer temperature, when the temperature in the reactor reaches 1200°C, stop feeding nitrogen, and feed hydrogen, the hydrogen pressure is set to 0.1MPa, ...

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Abstract

The invention relates to a hydrogen ironmaking method and device, belonging to the technical field of hydrogen metallurgy, and solves the problem that a large amount of carbon dioxide emissions are still caused by using hydrogen-rich gas to reduce iron oxides in the existing hydrogen iron smelting. The method adopts iron-containing ore raw materials in hydrogen or hydrogen-rich gas atmosphere, adopts microwave irradiation to realize hydrogen-rich or pure hydrogen smelting of iron-containing ore, and obtains direct reduced iron, including the following steps: step 1, iron-containing ore The raw material is pretreated; step 2, adding the raw material obtained in step 1 into the crucible, performing microwave irradiation, passing hydrogen or hydrogen-rich gas to reduce iron oxide; step 3, stopping microwave irradiation, stopping passing hydrogen, passing inert Gas protection, after the reaction is completed, return to room temperature to obtain direct reduced iron. The method can realize pure hydrogen smelting, realize zero carbon emission of ore reduction energy and catalysis, and is suitable for the promotion of pure hydrogen metallurgy technology.

Description

technical field [0001] The invention relates to the fields of hydrogen metallurgy and microwave metallurgy, in particular to a hydrogen ironmaking method and device. Background technique [0002] Global warming has become one of the major challenges affecting the world. According to statistics, nearly half of the carbon dioxide emitted by the entire industrial sector comes from four industries: cement, steel, ammonia and ethylene. Every ton of crude steel produced will emit about 2 tons of carbon dioxide. The task of energy conservation and emission reduction in the iron and steel industry is becoming increasingly severe. Traditional blast furnace ironmaking uses coke and coal powder as reducing agents and fuels to produce iron, and hot air is blown into the bottom of the blast furnace. , pulverized coal, coke, pulverized coal and air generate CO, which provides heat for the blast furnace reaction, and at the same time reduces iron oxides to metallic iron. This process con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00C22B34/12H05B6/80
CPCC21B13/006C22B34/12H05B6/80
Inventor 洪陆阔艾立群孙彩娇
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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