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Spontaneous combustion reduction method iron-smelting method and smelting device

A technology for smelting device and charge, applied in furnaces, furnace types, fluidized bed furnaces, etc., can solve problems such as failure to obtain large-scale production, high requirements for iron-containing grades, and complex procedures, so as to achieve no thermal pollution and improve smelting strength. , Environmentally friendly effect

Inactive Publication Date: 2016-02-24
HENGNAN YANGGANG METALLURGICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, these two types of methods are not independent and complete ironmaking methods, and have a series of shortcomings such as low production capacity, high energy consumption, short furnace life, and high requirements on the iron content of raw materials.
Except for the large-scale production of the COREX furnace, other non-blast furnace ironmaking methods have not yet achieved the technical level of large-scale production
Moreover, the existing smelting reduction method often adopts the two-step method of pre-reduction and final reduction, which has complicated procedures and high cost

Method used

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no. 1 approach

[0067] The first embodiment of the present invention relates to the ironmaking method of spontaneous combustion reduction method, which is carried out according to the following steps:

[0068] (1) Charge preparation:

[0069] The iron-containing raw materials (such as iron powder), coal, flux and binder are respectively ground into powder, and the batching is completed at one time according to the proportion; the batching is mixed with water, and extruded to obtain a charge block; air-dried.

[0070] Iron fine powder is an oxide of iron with an iron grade greater than 55% (mass percentage).

[0071] The fixed carbon in coal is both a reducing agent and a fuel. There are no strict requirements for the type of coal, coke, bituminous coal, and anthracite are all available. The content of harmful impurities (sulfur, phosphorus, etc.) in the coal used is subject to national standards. The feeding amount of the above-mentioned iron concentrate powder and coal makes the mass rati...

no. 2 approach

[0102] The second embodiment of the present invention relates to a smelting device.

[0103] The smelting device of the present invention mainly comprises tunnel kiln 10 and melting furnace 8 (see attached Figure 3-4 ). The tunnel kiln includes a kiln chamber, the bottom of the kiln chamber is equipped with a kiln car traveling track, and the kiln car 17 loaded with furnace material blocks runs on the track; the two ends of the tunnel kiln are provided with sealing devices 1 and 7; the kiln head is provided with an induced draft fan 2 to pull the wind, a high-temperature unloading device 6 is provided at the kiln tail, and the high-temperature unloading device can adopt push rods, push plates and other similar devices. A secondary air blowing system 4 is provided inside the tunnel kiln for blowing in fresh air or oxygen-enriched gas to promote the complete combustion of carbon monoxide in the furnace gas. The tunnel kiln is divided into a drying section, a preheating sectio...

no. 3 approach

[0114] The drying, preheating, and roasting methods (processes) used in the above-mentioned ironmaking methods can be used in other metallurgical processes besides the ironmaking process. This embodiment further proposes a method (process) for drying, preheating and roasting charge in the metallurgical process on the basis of the previous invention. Make full use of the heat emitted when the charge is preheated and roasted when the temperature reaches spontaneous combustion to dry, preheat and roast the charge. At the same time, the heat generated by the combustion of carbon monoxide in the high-temperature furnace gas is used to feed air or oxygen-enriched gas into the kiln chamber to dry, preheat and roast the furnace material. This process does not use other heat, and the production process no longer produces gas.

[0115] The above process is completed in the kiln chamber of the tunnel kiln, and the heat exchange is carried out through the reverse convection of the furnac...

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Abstract

The invention belongs to a non-blast-furnace smelting technology which achieves new energy development, replaces coke with coal and is low in cost and energy consumption, environment-friendly and short in technological procedure, and relates to a spontaneous combustion reduction method iron-smelting method and a smelting device. The method comprises the steps of furnace charge preparing, drying, preheating and roasting and smelting. According to the method, no sintering material or coke is adopted, and no coal gas is generated. The smelting device comprises a tunnel kiln and a smelt separation furnace. Waste heat generated by the smelt separation furnace is all used for drying and preheating of furnace charge blocks. Negative pressure operation and weak reduction smelting atmosphere completely opposite to those in a traditional iron-smelting method are adopted, the heat value of fuel is given into full play to the greatest extent, and energy is utilized most effectively.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and new energy development, and in particular relates to an ironmaking method and a smelting device. Background technique [0002] Steel is the food of industry and the lifeblood of the national economy, so the development and progress of ironmaking methods are of great significance to the technology and economy of the entire country. [0003] At present, the most mature ironmaking method is blast furnace ironmaking, which has the advantages of long furnace life, large production capacity, low energy consumption, and simple operation. However, blast furnace ironmaking has very strict requirements on furnace materials. The raw materials must be sintered, and coke must be used as the material column. [0004] Coke is obtained by refining coking coal, which has been listed as a scarce resource in the world. Coking coal reserves account for 5% of coal reserves, and only 30% to 40% have mining val...

Claims

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Application Information

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IPC IPC(8): C21B13/00
Inventor 何笃政郝坤超刘学新李国强
Owner HENGNAN YANGGANG METALLURGICAL TECH CO LTD
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