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A method for improving the heat uniformity of pre-sintering process

A pre-sintering and process technology, applied in the field of improving the thermal uniformity of the pre-sintering process, can solve the problems of unevenness, different macroscopic moisture content, and the inability to fundamentally improve the permeability of the sintering process, and achieve improved quality, obvious quality, and fuel consumption. reduced effect

Active Publication Date: 2018-12-04
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent realizes the difference in the final distribution of the moisture content of the sintering mixture in the sintering machine, it is only limited to the difference in the macroscopic moisture content. The effect of wetting cannot fundamentally improve the air permeability of the sintering process, and it cannot be applied in the pre-sintering process

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Effect test

Embodiment 1

[0018] During the sintering production process, the sintering mixture is distributed twice, the first distribution is the lower layer sintering mixture distribution, the second is the upper layer sintering mixture distribution, first the lower layer sintering mixture distribution is carried out, and the thickness of the distribution is 600mm, the water content of the lower layer of sintering mixture is controlled at 6.3%, ignited, after pre-sintering for 12min, on the surface of the sintered ore being sintered, the second upper layer of sintering mixture is laid out, the thickness of the cloth is 500mm, the The water content of the upper sintering mixture is controlled at 8.2%; then ignition and sintering is carried out again, the sum of the thickness of the total material layer is ≥1000mm, and the finished sintered ore is obtained until the end of sintering. The indicators of the sintering test in Example 1 of the present invention are shown in Table 1.

[0019] The upper and...

Embodiment 2

[0024] During the sintering production process, the sintering mixture is distributed twice, the first distribution is the lower layer sintering mixture distribution, the second is the upper layer sintering mixture distribution, first the lower layer sintering mixture distribution is carried out, and the thickness of the distribution is 800mm, the water content of the lower layer of sintering mixture is controlled at 6.6%, ignited, after pre-sintering for 12 minutes, on the surface of the sintered ore being sintered, the second upper layer of sintering mixture is distributed, and the thickness of the cloth is 400mm. The water content of the upper sintering mixture is controlled at 7.2%; then ignition and sintering is carried out again, the sum of the thickness of the total material layer is ≥1000mm, and the finished sintered ore is obtained until the end of sintering. The indicators of the sintering test of Example 2 of the present invention are shown in Table 2.

[0025] The u...

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Abstract

The invention provides a method for improving homo-heating property in a pre-sintering process. The method includes the steps of burdening, uniformly mixing of sintering materials, granulation, bottom material pavement, material distribution, ignition and sintering. During the sintering production process, a sintering mixture material is subjected to two-stage material distribution. Firstly, for the first time, a lower-layer sintering mixture material is distributed, material distribution thickness being 500-900 mm; and after ignition, the material is pre-sintered for a preset time, and then an upper-layer sintering mixture material is secondarily distributed on the surface of the material being sintered, material distribution thickness being 100-700 mm; and then ignition sintering is carried out again until sintering terminal, wherein the total thickness of the material layers is not less than 1000 mm; water content of the lower-layer sintering mixture material is controlled to be 5.9-6.7% and the water content of the upper-layer sintering mixture material is controlled to be 6.8-8.6%. By means of the method for sintering ore, quality is significantly improved and sintering solid fuel consumption is reduced, thus achieving the objects of homogenizing sintering, reducing cost and improving efficiency.

Description

technical field [0001] The invention belongs to the field of sintering, in particular to a method for improving the heat uniformity of a pre-sintering process. Background technique [0002] In the sintering production of the belt sintering machine, after the conventional one-time distribution and ignition, after the mixture is sintered for a certain period of time, it is again distributed and ignited, which is called the pre-sintering process. The production practice of industrial application shows that the pre-sintering process can significantly increase the total height of the sintering material layer, and can effectively increase the output of sintering ore. It is a brand-new sintering process. [0003] There are many factors affecting the quality of sinter, including the moisture content of sinter mixture, particle size of sintered solid fuel, alkalinity, MgO content, and types of iron-containing raw materials. [0004] Among the above factors, the moisture content of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 徐礼兵周明顺唐复平翟立委刘杰张辉姚林王义栋任子平韩淑峰宫作岩
Owner ANGANG STEEL CO LTD
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