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CEO compound smelting reduction ironmaking plant and technology

A compound type reduction furnace technology, applied in the field of smelting reduction ironmaking equipment, to achieve the effects of reducing investment in oxygen production, saving energy conversion losses, and reducing power consumption

Inactive Publication Date: 2013-12-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gas-based direct reduction method occupies a dominant position in the direct reduction ironmaking process, but due to the limitation of geographical conditions and raw material conditions, the development of this method is very uneven. It is only suitable for the use of high-grade iron ore in places with sufficient natural gas resources. The direct reduction ironmaking method using cheap non-coking coal as the main reducing agent can effectively avoid such geographical restrictions
The coal-based reduction method is mainly based on the rotary kiln, but there are also many problems. First, the ring formation problem has always plagued the development of the process. In addition, the efficiency is low, the reduction speed is slow, and the energy consumption is also high, which limits the process. Further development
[0011]Because blast furnace smelting has problems such as strict requirements on raw materials, high energy consumption and serious environmental pollution, the research work on non-blast furnace ironmaking is actively carried out to find alternatives The blast furnace ironmaking method is the direction that countries all over the world have been working hard in recent years

Method used

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  • CEO compound smelting reduction ironmaking plant and technology
  • CEO compound smelting reduction ironmaking plant and technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] With 72% (weight, the same below) sea sand ilmenite powder (full iron content 52-56%, TiO 2 6-8%, other elements are omitted), 16% coal powder (20-25% ash, 0.65-0.75% sulfur), 9% lime (more than 90% CaO), 3% binder after mixing and adding appropriate amount of water Make balls.

[0046] A 200KW DC electric arc furnace is used, and a 4-meter-long bottom chain-driven pre-reduction furnace is connected to the upper part of the electric arc furnace. Open a Φ100 tapping and slag hole. When iron slag is discharged, the coal-fired cyclone furnace blows hot air at 1400 degrees Celsius into the electric arc furnace through the iron slag outlet hole. The coal consumption of the cyclone furnace is 100Kg / h, and 2-4% oxygen is mixed into the air blasted by the cyclone furnace, and the purity of the oxygen is 99%.

[0047] Add the pellets made into the shaft furnace continuously. After 20 minutes, the previously added pellets enter the pre-reduction furnace. Through the chain tra...

Embodiment 2

[0051] The ingredient scheme is the same as the implementation case 1.

[0052] A 400KW DC electric arc furnace is used, and a 4-meter-long bottom chain-driven pre-reduction furnace is connected to the upper part of the electric arc furnace. Open a Φ100 tapping and slag hole.

[0053] Throw the cyclone stove out of use.

[0054] Add the pellets made into the shaft furnace continuously. After 20 minutes, the previously added pellets enter the pre-reduction furnace. Through the chain transmission device, the pellets gradually run from the low-temperature section of the pre-reduction furnace to the electric furnace after 30 minutes. In the high temperature section, the metallization rate of the reduced pellets can reach 40%. After the reduced pellets enter the electric furnace, they undergo final reduction and melting for about 20 minutes to produce 400Kg of pig iron per hour.

[0055] The composition of the molten iron obtained is the same as that of Example 1.

[0056] The ...

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Abstract

The invention relates to a CEO compound smelting reduction ironmaking plant and technology. The CEO compound smelting reduction ironmaking plant comprises combination of a vertical furnace, a pre-reduction furnace, an electric furnace, and a cyclone furnace which is arranged on the lateral wall of the electric furnace, wherein an outlet of the vertical furnace is directly connected with an inlet of the pre-reduction furnace; the pre-reduction furnace is connected with the electric furnace through a pipeline; the cyclone furnace is connected with the electric furnace through a pipeline. The technology comprises the following processes: firstly, preparing phi 10-40mm of carbon-containing pellets from iron ore powder, pulverized coal, lime and a binder; drying the carbon-containing pellets by using flue gas of 160-500 DEG C inside the vertical furnace and then feeding the dried carbon-containing pellets to the pre-reduction furnace connected with the vertical furnace; carrying out pre-reduction at the temperature of 300-1450 DEG C of the flue gas discharged from the inside of the electric furnace, and feeding the pre-reduced carbon-containing pellets to the electric furnace; and carrying out reduction and smelting separation at the temperature of 1500-1800 DEG C, wherein the cyclone furnace supplies a high-temperature gas of about 1000-1500 DEG C to the electric furnace by taking coal, air and oxygen as raw materials. The process disclosed by the invention has the characteristics of high energy efficiency, and high recovery rate of iron; kinds of coals and iron ores are used.

Description

Technical field: [0001] The invention belongs to smelting reduction ironmaking equipment and technology, in particular to a CEO compound type smelting reduction ironmaking device and its technology. Background technique: [0002] After nearly a hundred years of development, the blast furnace ironmaking process has reached a fairly perfect state. However, its production process has its insurmountable defects. First, blast furnace production requires high-grade iron ore raw materials and high-quality coke, and secondly, the sintering and coking processes carried out in conjunction with blast furnace production are highly polluting processes. In order to overcome various problems of blast furnace ironmaking, people have researched and developed a variety of non-blast furnace ironmaking methods, which eliminate the sintering and coking processes. At present, according to different product forms, non-blast furnace ironmaking is divided into two methods: direct reduction and sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B11/00
Inventor 郭汉杰韩谊李永麒赵松梅孙贯永李彬
Owner UNIV OF SCI & TECH BEIJING
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