Method and ball distributing device for improving air permeability of sintering material layer

A gas-permeable, sintered material technology, applied in the field of iron and steel metallurgy, can solve the problems of over-melting, high local temperature of auxiliary fuel, etc.

Active Publication Date: 2018-09-28
德龙钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent document CN 205275659 U discloses a distributing device for improving the yield of sintered ore in an ultra-thick material layer. The patent is to add auxiliary fuel

Method used

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  • Method and ball distributing device for improving air permeability of sintering material layer
  • Method and ball distributing device for improving air permeability of sintering material layer
  • Method and ball distributing device for improving air permeability of sintering material layer

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Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: The raw material ratio of air-permeable particles is as follows: 50% sawdust, 4% slaked lime powder, and the balance is iron ore powder. Mix the above-mentioned raw materials evenly, and make them into spherical bodies with a diameter of 8-10 mm through a granulator, and sieve out the slag and send them to the silo for standby. The air-permeable particles mentioned above are added to the sintered material, and the addition ratio is controlled at 1.5% of the total amount of the sintered material. The sintering parameters are as follows: negative pressure (-kPa) 13.2, vertical sintering speed (m / min) 0.03044, horizontal sintering speed (m / min) 1.607, sinter drum index (%) 77.33, RDI +3.15 (%) 81.36, 10% (°C) 1183 reflow reduction under load, 40% (°C) 1289 reflow reduction under load.

Embodiment 2

[0028] Embodiment 2: The raw material ratio of air-permeable particles is as follows: 50% sawdust, 5% slaked lime powder, and the balance is iron ore powder. Mix the above-mentioned raw materials evenly, and make them into spherical bodies with a diameter of 8-10 mm through a granulator, and sieve out the slag and send them to the silo for standby. The air-permeable particles mentioned above are added to the sintered material, and the addition ratio is controlled at 2.5% of the total amount of the sintered material. The sintering parameters are as follows: negative pressure (-kPa) 12.7, vertical sintering speed (m / min) 0.03055, horizontal sintering speed (m / min) 1.619, sinter drum index (%) 78.33, RDI +3.15 (%) 82.47, 10% (°C) 1197 reflow reduction under load, 40% (°C) 1328 reflow reduction under load.

Embodiment 3

[0029] Embodiment 3: The raw material ratio of air-permeable particles is as follows: 50% sawdust, 4.5% slaked lime powder, and the balance is iron ore powder. Mix the above-mentioned raw materials evenly, and make them into spherical bodies with a diameter of 8-10 mm through a granulator, and sieve out the slag and send them to the silo for standby. The air-permeable particles mentioned above are added to the sintered material, and the addition ratio is controlled at 2.0% of the total amount of the sintered material. The sintering parameters are as follows: negative pressure (-kPa) 12.8, vertical sintering speed (m / min) 0.03053, horizontal sintering speed (m / min) 1.618, sinter drum index (%) 76.67, RDI +3.15 (%) 81.36, 10% (°C) 1192 reflow reduction under load, 40% (°C) 1294 reflow reduction under load.

[0030] Sampling the test data obtained by the method of the present invention and the operation data comparison of the existing method are shown in the table below.

[003...

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Abstract

The invention provides a method for improving the air permeability of a sintering material layer. According to the method, prepared air-permeable particles are added into a sintering material according to the proportion in a layered mode when cloth is sintered. A preparation method of the air-permeable particles comprises the following steps that a, material proportion is carried out, wherein sawdust accounts for 50%, slaked lime powder accounts for 4-5%, and the balance is iron mine powder; b, granulating is carried out, wherein the air-permeable particle raw materials are uniformly mixed, and are made into spherical bodies with the diameter of 8-10 mm through a granulating machine; and c, the air-permeable particles are conveyed to a silo for later use after being cooled and screened, wherein in the cloth sintering process, the air-permeable particles are added into two layer bodies which are located at the position with the height of five-thirds of the height of the material layerand at the position with the height of one third of the height of the material layer correspondingly by utilizing a ball distributing device. The invention further provides the ball distributing device for adding the air-permeable particles. According to the method and ball distributing device for improving the air permeability of the sintering material layer, the permeability of the interior of the sintering material is effectively improved, the sintering speed can be increased under the condition that the physical and chemical properties of sintering ore are improved, and a foundation is laid for sintering and production increase.

Description

technical field [0001] The invention relates to a method for improving the air permeability of a sintered material layer and a ball distributing device used for realizing the method, belonging to the technical field of iron and steel metallurgy. Background technique [0002] The air permeability of the material layer during the sintering process has a crucial impact on the quality of the sinter. If the air permeability becomes poor and the vertical sintering speed is too slow, it will cause local over-melting, low porosity of the sinter, and poor reducibility. At the same time If the high-temperature layer is too thick, the airflow resistance will increase, which will cause uneven performance of sinter, and then the output will decrease accordingly. In order to improve the air permeability of the sintered material layer, the following methods are usually adopted: one is to use a spatter to loosen the material layer when the trolley is distributing the material, hoping that t...

Claims

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Application Information

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IPC IPC(8): C22B1/16C22B1/24
Inventor 王晓光王建芳李朝阳黄伟丽韩伟旗朱红芳陈四平牛跃威刘杰徐子谦
Owner 德龙钢铁有限公司
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