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Method and device using coal to directly reduce iron

A reduced iron, direct technology, used in fluidized bed furnaces, etc.

Inactive Publication Date: 2010-08-11
姜文平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There is no method and equipment for directly reducing iron with coal

Method used

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  • Method and device using coal to directly reduce iron
  • Method and device using coal to directly reduce iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Such as figure 1 As shown, a kind of equipment of direct reduction iron of the present invention, described equipment comprises a body of furnace 1, and the top of body of furnace is feed inlet 2, and the bottom of body of furnace is discharge port 3, and described body of furnace is provided with multiple Combustion pipeline 4, gas inlet pipe 5 is respectively connected to the two sides of the furnace body, the gas inlet pipe is connected to the gas generator 6, a circulating air duct 7 is arranged on the furnace body, and a fan is installed on the circulating air duct 8.

Embodiment 2

[0019] The present invention relates to a method for directly reducing iron with coal. The method is to mix iron-making raw materials, alloy chemical raw materials and high-strength binders in a weight ratio of 100:0.5:8, knead and stir, and then Use a double-roller briquette machine to press into pellets, and then directly roast them in a vertical tubular furnace with coal gas at 1200-1250°C, and then reduce them to crystalline iron by dry distillation in an oxygen avoidance, and then crush and separate them to obtain wrought iron materials.

[0020] The iron-making raw material is one or more mixtures of iron ore powder, iron fine powder, iron oxide scale, waste steel slag from steelmaking or selected fine powder.

[0021] The alloy chemical raw materials are mixed by the following raw materials in proportion by weight: 0.5 parts of ferrosilicon manganese mixture, 3 parts of calcium oxide CaO and 10 parts of blue carbon powder.

[0022] The high-strength adhesive is prepared...

Embodiment 3

[0024] The present invention relates to a method for directly reducing iron with coal. The method comprises mixing iron-making raw materials, alloy chemical raw materials and high-strength binders in a weight ratio of 100:1:6, kneading and stirring, and then Use a double-roller briquette machine to press into pellets, and then directly roast them in a vertical tubular furnace with coal gas at 1200-1250°C, and then reduce them to crystalline iron by dry distillation in an oxygen avoidance, and then crush and separate them to obtain wrought iron materials.

[0025] The iron-making raw material is one or more mixtures of iron ore powder, iron fine powder, iron oxide scale, waste steel slag from steelmaking or selected fine powder.

[0026] The alloy chemical raw material is prepared by mixing the following raw materials in proportions by weight: 1 part of ferrosilicon manganese mixture, 2 parts of calcium oxide CaO and 10 parts of blue carbon powder.

[0027] The high-strength ad...

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Abstract

The invention discloses a method and a device using coal to directly reduce iron. The method comprises the following steps: mixing iron-making materials, chemical alloy materials and high-strength binder by the weight ratio of 100:(0.5-1):(6-8); kneading and stirring; then, pressing the materials into pelletized bodies by a double-roller ball-pressing machine; directly calcining the pelletized bodies at 1,200 to 1,250 DEG C by using coal-based gas by a vertical tube furnace; and dry-distilling and reducing into crystalline iron in the absence of oxygen; and crushing and separating to obtain wrought iron materials. The device of the invention comprises a furnace body, wherein a feeding hole constitutes the top end of the furnace body, and a discharging hole constitutes the bottom end of the furnace body; a plurality of standby combustion tubes are arranged in the furnace body; gas inlet pipes are respectively connected to two lateral surfaces of the furnace body; gas outlet pipes are connected with a gas generator; and a circulating air pipe equipped with an air blower is arranged on the furnace. The weight percentage of iron in the produced product reaches 90% to 94%; and the cylindrical iron pressed by a high-strength pressure forming machine is a high-grade steel-making material having low contents of sulfur, phosphorus and silicon.

Description

technical field [0001] The invention relates to a method and equipment for directly reducing iron with coal. Background technique [0002] Blast furnace ironmaking production is the most important link in the metallurgical (steel) industry. Blast furnace smelting is a continuous process of reducing iron ore to pig iron. [0003] The purpose of blast furnace smelting is to extract the iron element in the ore, and the main product produced is molten iron. By-products include: water slag, slag cotton and blast furnace gas. [0004] Blast furnace production is continuous. A generation of blast furnaces (from the opening of the furnace to the shutdown for overhaul) can be continuously produced for several to ten years. During production, iron ore, coke and flux are continuously loaded from the top of the furnace (generally, the top of the furnace is composed of materials and hoppers, and modern blast furnaces are bell valve tops and bellless tops), and blown from the tuyeres ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/00C21B13/00
Inventor 姜文平
Owner 姜文平
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