Device and method for metal oxide fine ore gas-based reduction

Abstract

The invention discloses a device for metal oxide fine ore gas-based reduction. The device sequentially comprises an oxidizing roasting system, a gas-based pre-reduction system and a gas-based deep reduction system according to a process sequence. The device further comprises a molecular sieve pressure swing adsorption system, a pure hydrogen muffle heat exchange heating furnace system and a dust removal and smoke exhaust system. According to the device, CO and H2 are separated out through the molecular sieve pressure swing adsorption device, after CO coal gas is firstly adopted for oxidizing,roasting and heating fine ore, fine ore with sensible heat of 900-1000 DEG C passes through a boiling pre-reduction furnace and is subjected to gas-solid boiling type sufficient contact and reductionreacting with H2 heated through muffle heat exchange, then boiling type sufficient deep reduction reacting is carried out on a gas-solid boiling deep reduction furnace and warm H2, and a high-qualityreduced iron (DRI) product is deeply reduced by utilizing high-temperature sensible heat of the fine ore in the gradual cooling process. The invention further comprises a method for carrying out metaloxide fine ore gas-based reduction by using the device.

Description

technical field

[0001] The invention belongs to the field of metallurgical equipment and technology, and in particular relates to a device and method for gas-based reduction of metal oxide powder ore. Background technique

[0002] According to industrial statistical data and authoritative experts: smelting direct reduced iron ton product CO 2 The emission is 800kg; blast furnace smelting iron CO 2 The emission is 1600kg, therefore, the CO of non-blast furnace ironmaking (direct reduced iron) 2 Emissions can be reduced by 50%. Today, China is the largest country in steel production capacity in the world. In 2018, my country's steel production accounted for 73.8% of Asia's total and 51.3% of global production. Blast furnace ironmaking has become the dominant force, while direct reduced iron production is less than the world's total production. 1%. Therefore, it is imperative to develop non-blast furnace ironmaking in my country's iron and steel metallurgy field.

[0003] T...

Examples

Embodiment 1

[0088] A device for gas-based reduction of metal oxide powder ore, which sequentially includes an oxidation roasting system 1, a gas-based pre-reduction system 2, and a gas-based deep reduction system 3 in sequence; it also includes a molecular sieve pressure swing adsorption system 4, a pure hydrogen flame trap Heat exchange heating furnace system and dust removal and smoke exhaust system;

[0089] The oxidation roasting system 1 includes a CO gas burner 101; a kiln tail cover 104 is set at the feed end, and a kiln head cover 108 is set at the discharge end; the kiln body is supported by a kiln tail support ring 106 and a kiln head support ring 107; The kiln tail cover 104 is connected to the feeding hopper 102 through the feed pipe 103; the kiln tail cover 104 is provided with a smoke exhaust port 105; the kiln head cover 108 is provided with a high temperature material outlet 109.

[0090] The gas-based pre-reduction system 2 includes a pre-reduction furnace cylinder body 2...

Embodiment 2

[0121] The gas-based reduction was performed using the apparatus in Example 1.

[0122] Grade TFe: 71.5%, fineness 300-500 mesh Liaoning Jianping ultra-pure iron concentrate powder. Take 100kg of ore sample, use oxidation roasting system 1 to oxidize and roast it, heat it to 970°C, put it into ￠1000mm×4m pre-reduction furnace cylinder 201, adjust the installation angle of pre-reduction furnace cylinder 201 to 0.3°, place 99.9% pure H obtained by electrolysis of water 2 , using a gas electric heater, the H 2 After flame insulation heating to 780°C, pressurize to a pressure of 18KPa, put it into the pre-reduction furnace cylinder 201 for pre-reduction, after 1.6 hours of reduction time, the temperature of reduced iron (DRI) is 710°C, take samples to protect after cold pressing , the detection index is:

[0123] Then add DR I at a temperature of 710°C into the deep reduction furnace cylinder 301 with a diameter of ￠800mm×2.5m in a sealed manner. The installation angle of the d...

Embodiment 3

[0128] The gas-based reduction was performed using the apparatus in Example 1.

[0129] Grade TFe: 70.24%, fineness 300-400 mesh Liaoning Jianping iron ore concentrate powder. Take 100kg of ore sample, use oxidation roasting system 1 to oxidize and roast it, heat it to 990°C, put it into ￠1000mm×4m pre-reduction furnace cylinder 201, adjust the installation angle of pre-reduction furnace cylinder 201 to 0.25°, set 99.9% pure H obtained by electrolysis of water 2 , using a gas electric heater, the H 2 After flame insulation heating to 780°C, pressurize to 16KPa, put it into the pre-reduction furnace cylinder 201 for pre-reduction, after 1.6 hours of reduction time, the temperature of reduced iron (DRI) is 721°C, take samples to protect after cold pressing , the detection index is:

[0130] Then add DR I at a temperature of 721°C into the deep reduction furnace cylinder 301 with a diameter of ￠800mm×2.5m in a sealed manner. The installation angle of the deep reduction furnace...

technical field

[0001] The invention belongs to the field of metallurgical equipment and technology, and in particular relates to a device and method for gas-based reduction of metal oxide powder ore. Background technique

[0002] According to industrial statistical data and authoritative experts: smelting direct reduced iron ton product CO 2 The emission is 800kg; blast furnace smelting iron CO 2 The emission is 1600kg, therefore, the CO of non-blast furnace ironmaking (direct reduced iron) 2 Emissions can be reduced by 50%. Today, China is the largest country in steel production capacity in the world. In 2018, my country's steel production accounted for 73.8% of Asia's total and 51.3% of global production. Blast furnace ironmaking has become the dominant force, while direct reduced iron production is less than the world's total production. 1%. Therefore, it is imperative to develop non-blast furnace ironmaking in my country's iron and steel metallurgy field.

[0003] T...

Examples

Embodiment 1

[0088] A device for gas-based reduction of metal oxide powder ore, which sequentially includes an oxidation roasting system 1, a gas-based pre-reduction system 2, and a gas-based deep reduction system 3 in sequence; it also includes a molecular sieve pressure swing adsorption system 4, a pure hydrogen flame trap Heat exchange heating furnace system and dust removal and smoke exhaust system;

[0089] The oxidation roasting system 1 includes a CO gas burner 101; a kiln tail cover 104 is set at the feed end, and a kiln head cover 108 is set at the discharge end; the kiln body is supported by a kiln tail support ring 106 and a kiln head support ring 107; The kiln tail cover 104 is connected to the feeding hopper 102 through the feed pipe 103; the kiln tail cover 104 is provided with a smoke exhaust port 105; the kiln head cover 108 is provided with a high temperature material outlet 109.

[0090] The gas-based pre-reduction system 2 includes a pre-reduction furnace cylinder body 2...

Embodiment 2

[0121] The gas-based reduction was performed using the apparatus in Example 1.

[0122] Grade TFe: 71.5%, fineness 300-500 mesh Liaoning Jianping ultra-pure iron concentrate powder. Take 100kg of ore sample, use oxidation roasting system 1 to oxidize and roast it, heat it to 970°C, put it into ￠1000mm×4m pre-reduction furnace cylinder 201, adjust the installation angle of pre-reduction furnace cylinder 201 to 0.3°, place 99.9% pure H obtained by electrolysis of water 2 , using a gas electric heater, the H 2 After flame insulation heating to 780°C, pressurize to a pressure of 18KPa, put it into the pre-reduction furnace cylinder 201 for pre-reduction, after 1.6 hours of reduction time, the temperature of reduced iron (DRI) is 710°C, take samples to protect after cold pressing , the detection index is:

[0123] Then add DR I at a temperature of 710°C into the deep reduction furnace cylinder 301 with a diameter of ￠800mm×2.5m in a sealed manner. The installation angle of the d...

Embodiment 3

[0128] The gas-based reduction was performed using the apparatus in Example 1.

[0129] Grade TFe: 70.24%, fineness 300-400 mesh Liaoning Jianping iron ore concentrate powder. Take 100kg of ore sample, use oxidation roasting system 1 to oxidize and roast it, heat it to 990°C, put it into ￠1000mm×4m pre-reduction furnace cylinder 201, adjust the installation angle of pre-reduction furnace cylinder 201 to 0.25°, set 99.9% pure H obtained by electrolysis of water 2 , using a gas electric heater, the H 2 After flame insulation heating to 780°C, pressurize to 16KPa, put it into the pre-reduction furnace cylinder 201 for pre-reduction, after 1.6 hours of reduction time, the temperature of reduced iron (DRI) is 721°C, take samples to protect after cold pressing , the detection index is:

[0130] Then add DR I at a temperature of 721°C into the deep reduction furnace cylinder 301 with a diameter of ￠800mm×2.5m in a sealed manner. The installation angle of the deep reduction furnace...

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