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Technique for comprehensively utilizing iron-containing dust mud

A technology of iron dust sludge and process, applied in the field of comprehensive utilization of iron dust sludge, can solve the problems of low DRI quality, insufficient removal of impurities by direct reduction process, limitation of comprehensive utilization of iron dust sludge, etc., so as to improve economic benefits and improve The effect of comprehensive utilization efficiency and reduction of process energy consumption

Inactive Publication Date: 2015-06-10
BAOSTEEL DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The DRI obtained by direct reduction is used in the blast furnace ironmaking or steelmaking process, but due to the insufficient removal of impurities in the direct reduction process, the quality of the produced DRI is low, which also has a negative impact on the subsequent use in the steelmaking and ironmaking process, so The comprehensive utilization of iron-containing dust and sludge in this process is also greatly restricted

Method used

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  • Technique for comprehensively utilizing iron-containing dust mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 Shown: Iron-containing dust produced in the iron and steel production process, FeOx% in iron-containing dust is about 55%, C% is about 3%, ZnO% is about 0.7%, CaO% is about 12%, and reaction aids, reducing agents, Binder, through strong mixing and mixing, after briquetting (briquetting) or pelletizing process, the iron-containing dust is made into lumps or balls, and after drying or curing, the dried lumps or balls Added to the rotary hearth furnace, in the pre-reduction process of the rotary hearth furnace, the ZnO in the dust sludge enters the flue gas system. ZnO removal, alkali metal removal and pre-reduction were performed in a rotary hearth furnace, ZnO was recovered in the flue gas of the rotary hearth furnace, and metallized pellets DRI were obtained after pre-reduction. The DRI produced by the rotary hearth furnace is added to the melting furnace to separate the molten slag and iron. The separated molten iron enters the steelmaking process, an...

Embodiment 2

[0030] Such as figure 1 Shown: Aluminum Al 2 o 3 Iron-containing dust sludge 1 produced in the production process, FeOx% in iron-containing dust sludge is about 40%, ZnO% is about 0.05%, CaO% is about 12%, SiO 2 % about 8%, with reaction aids, reducing agents, binders, through strong mixing and mixing, and then through briquetting (briquetting) or pelletizing process, the iron-containing dust is made into lumps or balls, after drying After drying or curing, the dry block or spherical red mud is added to the rotary hearth furnace in the rotary hearth furnace pre-reduction process. Alkali metal removal and pre-reduction in a rotary hearth furnace to obtain metallized pellets DRI after pre-reduction. The DRI produced by the rotary hearth furnace is added to the melting furnace to separate the molten slag and iron. The separated molten iron enters the steelmaking process, and the separated dust and sludge slag can be used to produce cement, mineral wool or High value-added sil...

Embodiment 3

[0033] Such as figure 1 Shown: Iron-containing dust, mixed with reaction aids, reducing agents, and binders by force, after briquetting (briquetting) or pelletizing process, the iron-containing dust is made into lumps or balls , after drying or curing, the dried massive or spherical dust sludge is added to the rotary hearth furnace. In the pre-reduction process of the rotary hearth furnace, the ZnO in the dust sludge enters the flue gas system. ZnO removal, alkali metal removal and pre-reduction were performed in a rotary hearth furnace, ZnO was recovered in the flue gas of the rotary hearth furnace, and metallized pellets DRI were obtained after pre-reduction. The DRI produced by the rotary hearth furnace is added to the melting furnace to separate the molten slag and iron. The separated molten iron enters the steelmaking process, and the separated dust and sludge slag is used to produce mineral wool after conditioning and heating.

[0034] The difference between Example 3 a...

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Abstract

The invention discloses a technique for comprehensively utilizing iron-containing dust mud, which is characterized by comprising the following steps: preparing iron-containing dust mud into blocks or balls by block pressing, ball pressing or balling, drying the ball or blocky red mud, adding the red mud into a rotary hearth furnace, carrying out ZnO removal, alkali metal removal and FeOx pre-reduction on the dust mud in the rotary hearth furnace technique, recovering ZnO from rotary hearth furnace flue gas, and pre-reducing to obtain the metalized pellet DRI; and adding the DRI generated from the rotary hearth furnace into a melting furnace to perform slag-iron separation, sending the separated molten iron into a steelmaking technique, and carrying out concurrent heating hardening and tempering on the dust mud molten slag separated from the metal, wherein the product can be used for producing cement, mineral wool, microcrystalline glass or other high-added-value silicate products. Thus, the technique enhances the comprehensive utilization efficiency of the whole iron-containing dust mud, and enhances the comprehensive utilization economic benefit of the iron-containing dust mud.

Description

technical field [0001] The invention relates to a process for comprehensive utilization of iron-containing dust and sludge, which belongs to the field of comprehensive utilization of iron-containing dust and sludge, and also relates to direct reduction in a rotary hearth furnace, melting and final reduction smelting reduction, iron-containing dust and sludge smelting waste slag production of cement (mineral wool or Glass-ceramic) silicate materials and other fields. Background technique [0002] At present, among the iron-containing dust and sludge, most of the dust and sludge produced in the steelmaking and ironmaking process are returned to the ironmaking and sintering process or the cold briquetting process to be used in the steelmaking process, while the dust and sludge produced in the alumina production process are mostly used in landfill, magnetic Comprehensive utilization of magnetic separation process after magnetic separation or direct reduction. However, because t...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/00C04B7/147C03B37/005C03C10/00
CPCY02P10/20Y02P40/10
Inventor 彭程范建峰
Owner BAOSTEEL DEV CO LTD
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