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Method for intensifying limonite sintering

A limonite and ore-returning technology, which is applied in the field of strengthening limonite sintering, can solve the problems of adding baffles, and achieve the effect of increasing heat, good effect, and large economic benefits

Inactive Publication Date: 2010-05-05
WUHAN IRON & STEEL (GROUP) CORP
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Problems solved by technology

However, these measures have certain limitations. For high limonite ratio sintering, it is difficult to adjust the relevant operating process parameters to have obvious effects, and the height of the baffle plate must be increased for thick material layers, and the high alkalinity is adjusted according to the needs of blast furnace smelting.

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  • Method for intensifying limonite sintering

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the drawings and embodiments:

[0034] As shown in the figure, the experimental steps of the present invention are roughly divided into the stages of raw material preparation→primary mixing→secondary mixing→distribution→ignition→sintering→cooling→sieving. The specific steps are as follows:

[0035] 1) Preparation of raw materials: According to the requirements of the sintered ore product to meet the basicity of CaO / SiO2 = 1.5-3.0, the content of TFe is 50%-60%, the content of MgO is 2.0%-4.0%, the weight ratio of each material is iron-containing Raw materials 10%-20%, quicklime 2.0%-5.0%, dolomite 0-8%, limestone 5%-12%, coal powder or coke powder 3%-8%, return ore 3%-40%. Take no sucrose solution as a reference point, and add a 4%-10% sucrose solution by weight under the same ratio. Using conventional calculation methods, calculate the raw material components that meet the required ratio for use. A...

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Abstract

A method for intensifying limonite sintering has the advantage of changing the property of the moisture of the mixture by adding sucrose solution with weight concentration being 4-10%. The solution has certain viscosity which is reduced with the increase of the temperature. In the processes of mixing and granulating, the mineral powder with fine grains is well adhered to the surfaces of pellets, thus intensifying limonite granulating, improving the intensity of the pellets of the mixture and achieving the aims of intensifying limonite sintering, improving the quality of sintered minerals and reducing solid fuel consumption. The method has better effects especially on the limonite with finer grain sizes. The sucrose has the greatest characteristic of totally reacting in the process of sintering and leaving no residues in the sinter, thus having no impact on the quality of the sinter.

Description

Technical field [0001] The invention relates to the field of sintering technology in the metallurgical industry, in particular to a method for strengthening limonite sintering. Background technique [0002] At present, with the rapid development of the steel industry, there are fewer and fewer high-grade iron ore available for sintering, and the application of low-grade limonite to sintering production has become an inevitable trend. As we all know, limonite has a loose structure and a high content of crystal water, which affects the sintered ore yield, cooling strength and solid fuel consumption during the sintering process. The main unfavorable factors affecting the production of sinter are the increase in water absorption in the raw material particles during the granulation process, the decomposition of crystal water and the generation of pores and assimilation reactions due to thermal cracking are prone to occur, so that the cohesiveness and air permeability of the sinter Se...

Claims

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Application Information

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IPC IPC(8): C22B1/16C21B3/00C21B5/00
Inventor 冯红云李军王素平张望兴胡平萧扬
Owner WUHAN IRON & STEEL (GROUP) CORP
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