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A super-thick material layer sintering method using pre-sintering to reduce the sintering return rate

A sintering method and pre-sintering technology, which is applied in the field of ultra-thick material layer sintering using pre-sintering, and can solve the problems of sintering machine capacity and quality decline

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

Studies at home and abroad have shown that only by simply increasing the thickness of the sintering mixture without taking corresponding technological measures, the productivity and quality of the sintering machine will drop sharply after the thickness of the material layer reaches a certain level, which is not worth the candle.

Method used

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  • A super-thick material layer sintering method using pre-sintering to reduce the sintering return rate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Concrete technological process of the present invention is as figure 1 , on the basis of the original sintering belt roasting machine distributor 1 and igniter 1, a set of mixture distributor 2 and igniter 2 is added. The whole sintering production adopts a set of ventilation system, and the first distribution is carried out first. The thickness is 700mm, the mixture contains coke powder with a weight percentage of 2.7%, and the water content is 7.2%. The ignition temperature is controlled at 1150°C. After ignition, two heat preservation covers are arranged, and the volume percentage of oxygen is introduced into the heat preservation cover. 18%, hot air with a temperature of 120°C;

[0016] The sintered mixture used for the second distributing enters into a separate coal blender, and fuel and water are added to the coal blender before entering the second distributing system. At this time, the moisture weight percentage of the sintered mixture is 7.6%. The weight percen...

Embodiment 2

[0022] Concrete technological process of the present invention is as figure 1 , on the basis of the original sintering belt roasting machine distributor 1 and igniter 1, a set of mixture distributor 2 and igniter 2 is added. The whole sintering production adopts a set of ventilation system, and the first distribution is carried out first. The thickness is 800mm, the mixture contains coke powder with a weight percentage of 2.4%, and the water content is 7.1%. The ignition temperature is controlled at 1200°C. After ignition, 3 heat preservation covers are arranged, and the volume percentage of oxygen is introduced into the heat preservation cover. 19%, hot air with a temperature of 150°C;

[0023] The sintered mixture used for the second distributing enters into a separate coal mixer, and fuel and water are added to the coal mixer before entering the second distributing system. At this time, the moisture weight percentage of the sintered mixture is 7.8%. The weight percent of t...

Embodiment 3

[0029] Concrete technological process of the present invention is as figure 1 , on the basis of the original sintering belt roasting machine distributor 1 and igniter 1, a set of mixture distributor 2 and igniter 2 is added. The whole sintering production adopts a set of ventilation system, and the first distribution is carried out first. The thickness is 850mm, the mixture contains coke powder with a weight percentage of 2.4%, and the water content is 7.3%. The ignition temperature is controlled at 1250°C. After ignition, 4 heat preservation covers are arranged, and the volume percentage of oxygen is introduced into the heat preservation cover. 20%, hot air at 200°C;

[0030] The sintered mixture used for the second distributing enters into a separate coal mixer, and fuel and water are added to the coal mixer before entering the second distributing system. At this time, the moisture weight percentage of the sintered mixture is 7.9%, and the The percentage by weight of the po...

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Abstract

The invention discloses an ultra-thick bed sintering method for reducing sinter return ratio and employing presintering; ignition temperature is optimized, a suitable amount of insulation covers are provided, high-oxygen hot air is introduced, surface ignition quality of upper and lower beds of sinter can be effectively improved, mineralizing time of surface sinter can be extended, and cold brittleness of the sinter is reduced; through reasonable coal allocation and water regulation for the upper bed of sinter mixture and reducing the amount of rolls of a distributor, better breathability is provided for the upper bed of sinter mixture; according to the features of the upper bed of mixture, bed combustion and particle size deviating is inhibited, and the bed never combusts too fast; through comprehensive technical means, it is possible to effectively decrease the return ratio of the upper bed of sinter and the whole bed of sinter.

Description

technical field [0001] The invention relates to a sintering production method of iron ore, in particular to an ultra-thick material layer sintering method using pre-sintering to reduce the sintering return rate. Background technique [0002] In ironmaking production, the rate of returning ore is an important production index, which directly reflects the production status of sintering. The return rate is low, the production status is good, the output of sintered ore is high, and the quality is good. The return rate is high, the production status is poor, the sinter output is low, and the quality is poor. [0003] In the current conventional sintering production, in order to reduce the return rate of sinter ore, the main measures are: (1) optimize the ore blending, improve the strength of the sinter drum; (2) increase the ferrous content of the material layer, to a certain extent Improve the sintering strength; (3) reduce the sintering air leakage rate and improve the gas pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/22
CPCC22B1/22
Inventor 周明顺唐复平刘杰翟立委张辉徐礼兵姚林王义栋韩淑峰任子平宫作岩
Owner ANGANG STEEL CO LTD
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