Method for improving quality of direct reduced iron by rotary hearth furnace

A technology for reducing iron and rotary hearth furnace, applied in the field of iron and steel smelting, can solve the problems of high gangue and sulfur content, low density, low grade, etc., and achieve the effects of cost saving, less metal loss and quality improvement

Inactive Publication Date: 2011-05-18
WUKUN STEEL
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  • Application Information

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Problems solved by technology

As a result, the direct reduced iron in the rotary hearth furnace is difficult to be directly used in subsequent converter and electric furnace steelmaking due to its low grade, high gangue and sulfur content, and low density, which also affects the rotary hearth furnace to a large extent. Research and development, promotion and application of direct reduction process

Method used

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  • Method for improving quality of direct reduced iron by rotary hearth furnace
  • Method for improving quality of direct reduced iron by rotary hearth furnace

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Experimental program
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Effect test

Embodiment 1

[0021] A. Rotary hearth furnace direct reduced iron: TFe content is 62.41%, SiO 2 Iron ore concentrate with a content of 7.31% is used as raw material, and a mass ratio of 24% coal powder and 3% bentonite is added. The RZD-105-14 / 16 rotary hearth furnace experimental device of the prior art is used. Under the production process and technical conditions of the rotary hearth furnace, direct reduced iron is produced by roasting for 30 minutes, and the composition of direct reduced iron is: TFe: 80.06%, SiO 2 : 9.08%, S: 0.18%, and the metallization rate is 92.77%, which is consistent with the Chinese SiO in Table 1 2 The requirements of the "Technical Conditions for Direct Reduced Iron for Steelmaking" recommended by the Metal Society are far apart, see Table 1;

[0022] B, A step gained direct reduced iron is carried out following treatment:

[0023] 1), after being crushed by a conventional crusher of the prior art, it is then ground to below 2mm by a grinding machine, wherei...

Embodiment 2

[0027] The equipment used is with embodiment 1;

[0028] A, rotary hearth furnace direct reduced iron are with the A step of embodiment 1;

[0029] B, A step gained direct reduced iron is carried out following treatment:

[0030] 1), after being crushed by a crusher of the prior art, it is then ground to below 2mm by a grinding machine, wherein the proportion of -200 mesh accounts for 35.00%;

[0031] 2), under the condition that the magnetic field strength is 160kA / m, carry out magnetic separation to the reduced iron that step A is crushed and finely ground with a conventional magnetic separator of the prior art, select iron powder and gangue, and dissociate the vein Stone discarded to get TFe: 92.10%, SiO 2 : 3.10%, S: 0.085%, high-quality iron powder with a metallization rate of 94.84%;

[0032] 3), the iron powder that magnetically selects is filtered with the ZPG-100 disk type vacuum filter of prior art, after dehydration, with the iron powder of the water content 9% o...

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Abstract

The invention provides a method for improving quality of direct reduced iron by a rotary hearth furnace. The method breaks and fine grinds the iron which is directly reduced by the rotary hearth furnace to fine powder of 2mm, carries out the magnetic separation under the condition that the strength of a magnetic field is 110-160kA / m for selecting iron powder and gangue, compresses into the direct reduced iron product with the density of being greater than 4t / m<3> after filtration and drying and then directly pours into a furnace for steelmaking. The method can not only remove residual carbon and ash mixed in the direct reduced iron by the rotary hearth furnace, but also remove most of S brought by coal powder and the gangue in iron ores, thereby significantly improving the quality of the direct reduced iron, being directly used for steelmaking in an electric furnace and a rotary furnace and effectively reducing the production cost; tests prove that the direct reduced iron during the grinding and selection process can not generate the secondary oxidation basically, the recovery rate of the metal iron is generally higher than 95 percent, the highest can achieve 99 percent, and the metal loss is less.

Description

technical field [0001] The invention relates to a method for improving the quality of direct reduced iron in a rotary hearth furnace, belonging to the technical field of iron and steel smelting. technical background [0002] Direct reduction ironmaking technology refers to the production process in which iron ore is reduced to sponge iron below the melting temperature. It is the development direction of ironmaking technology in the future, and it is also a major technological innovation project encouraged and supported by national industrial policies. one. According to the classification of the reducing agent used, the direct reduction ironmaking technology can be divided into two categories: the gas-based method using gas as the reducing agent, and the coal-based method using coal as the reducing agent. At present, more than 80% of direct reduced iron in the world is produced by gas-based direct reduction process, and the output of coal-based reduced iron is less than 20%....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/08B03C1/02
Inventor 杨雪峰温海滨
Owner WUKUN STEEL
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