Tube furnace-shaft furnace twin coal-base fusing reduction iron-smelting method

Abstract

The invention relates to a coal-based smelting reduction iron making process, specifically to a duplex coal-based smelting reduction iron making method of tubular furnace and shaft furnace, which solves the problems existing in the coal-based smelting reduction iron making methods of the prior art. Technological procedures include: preparation: iron ore powder, coal powder and lime powder; adding water to mix; shaping by high-pressure briquette; enhancing preheating and drying; pre-reducing the tubular furnace; carrying out final reduction of shaft furnace smelting reduction and practicing forehearth separation of iron and slag. The invention has advantages of small overall investment, low overall energy consumption, little pollution, low failure rate of equipments and stable production operation; flexible production scale, easiness in unified production for casting; low cost and high investment return; short process, easiness in operation, few equipments needed and easiness in maintenance.

Description

technical field

[0001] The invention relates to a coal-based smelting reduction ironmaking method, in particular to a tube furnace-shaft furnace double coal-based smelting reduction ironmaking method. Background technique

[0002] At present, the more popular two-step coal-based smelting reduction ironmaking methods mainly include: suspension furnace-electric furnace duplex method, rotary kiln-electric furnace duplex method, fluidized bed-shaft furnace duplex method.

[0003] Suspension furnace - electric furnace duplex method. First, the iron ore powder and fine-grained carbon powder are blown into the suspension furnace by air, the iron ore powder and carbon powder are suspended in the air, the coal burns to release heat, and 70% of the oxygen in the iron ore powder is taken away for pre-reduction Fine iron particles are produced, and the materials that fall to the bottom of the furnace by gravity are melted and finally reduced by the electric furnace. And realize slag-i...

Examples

Embodiment Construction

[0030] The embodiments of the present invention are further described, and the embodiments are used to illustrate the present invention, but not to make any inventions.

[0031] 1. Iron ore powder, coal powder, and lime powder are mixed according to a certain proportion, among which: coal powder should exceed 10% to 20% of the amount required for reducing iron, so as to maintain a reducing atmosphere in the shaft furnace, and lime powder is mixed into one for To increase the plasticity of the mixture, the second is desulfurization. The amount of lime to be mixed should be determined according to the sulfur content of iron ore powder and coal powder, the content of gangue in iron ore powder, silicon dioxide in coal ash, and effective calcium oxide in lime powder. Wherein effective calcium oxide: total silicon dioxide=1~3.

[0032] 2. Add water to the above three materials and stir them thoroughly. The amount of water added depends on the plasticity requirements. Generally, the ...

technical field

[0001] The invention relates to a coal-based smelting reduction ironmaking method, in particular to a tube furnace-shaft furnace double coal-based smelting reduction ironmaking method. Background technique

[0002] At present, the more popular two-step coal-based smelting reduction ironmaking methods mainly include: suspension furnace-electric furnace duplex method, rotary kiln-electric furnace duplex method, fluidized bed-shaft furnace duplex method.

[0003] Suspension furnace - electric furnace duplex method. First, the iron ore powder and fine-grained carbon powder are blown into the suspension furnace by air, the iron ore powder and carbon powder are suspended in the air, the coal burns to release heat, and 70% of the oxygen in the iron ore powder is taken away for pre-reduction Fine iron particles are produced, and the materials that fall to the bottom of the furnace by gravity are melted and finally reduced by the electric furnace. And realize slag-i...

Examples

Embodiment Construction

[0030] The embodiments of the present invention are further described, and the embodiments are used to illustrate the present invention, but not to make any inventions.

[0031] 1. Iron ore powder, coal powder, and lime powder are mixed according to a certain proportion, among which: coal powder should exceed 10% to 20% of the amount required for reducing iron, so as to maintain a reducing atmosphere in the shaft furnace, and lime powder is mixed into one for To increase the plasticity of the mixture, the second is desulfurization. The amount of lime to be mixed should be determined according to the sulfur content of iron ore powder and coal powder, the content of gangue in iron ore powder, silicon dioxide in coal ash, and effective calcium oxide in lime powder. Wherein effective calcium oxide: total silicon dioxide=1~3.

[0032] 2. Add water to the above three materials and stir them thoroughly. The amount of water added depends on the plasticity requirements. Generally, the ...

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