A method for improving the air permeability of a sintered material layer and a device for distributing balls

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

Active Publication Date: 2019-09-24
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 to the mixture to improve the air permeability of the material layer. However, the auxiliary fuel will cause local The temperature is too high, causing local over-melting

Method used

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  • A method for improving the air permeability of a sintered material layer and a device for distributing balls
  • A method for improving the air permeability of a sintered material layer and a device for distributing balls
  • A method for improving the air permeability of a sintered material layer and a device for distributing balls

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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

A method for improving the air permeability of the sintered material layer. When the method is sintered, the prefabricated air-permeable particles are added to the sintered material in layers according to the proportion. The preparation method of the air-permeable particles is as follows: a. Ingredients: 50% sawdust, slaked lime powder 4-5%, and the balance is iron ore powder; b, granulation: mix the above-mentioned air-permeable granule raw materials evenly, and make a spherical body with a diameter of 8-10 mm through a granulator; c, sieve the air-permeable granules after cooling It is sent to the silo for standby; during the sintering process, the air-permeable particles are added to the two layers at the fifth and third of the height of the material layer by using the ball distribution device. The invention also provides a ball distribution device for adding air-permeable particles. The invention effectively improves the air permeability inside the sintering material, and in the case of improving the physical and chemical properties of the sintering ore, it can also increase the sintering speed and lay a foundation for increasing the production of sintering.

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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Patent Type & Authority Patents(China)
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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