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A kind of sintering method of limonite ultra-thick material layer adopting pre-sintering

A sintering method and limonite technology, which is applied in the field of sintering production using pre-sintered limonite ultra-thick material layer, can solve the problems of sintering machine capacity and quality decline, and achieve the improvement of sintering technical indicators, increase the ratio of addition, The effect of high economic value

Active Publication Date: 2018-05-29
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 kind of sintering method of limonite ultra-thick material layer adopting pre-sintering
  • A kind of sintering method of limonite ultra-thick material layer adopting pre-sintering
  • A kind of sintering method of limonite ultra-thick material layer adopting pre-sintering

Examples

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Effect test

Embodiment 1

[0016] Concrete technological process of the present invention is as figure 1 , in a 360m 2 , trolley railing height 700mm sintering machine, during the pre-sintering process production, through the batching, mixing and granulation system set up for the first distribution, 100% limonite and part of coke powder, limestone, quicklime and magnesite The batching, primary mixing and secondary granulation are carried out. Before the distribution, the alkalinity of the sinter mixture is controlled at 2.25, and the water weight percentage is at 7.7%. When distributing and igniting for the first time through the distributor 2 and the igniter 3, the height of the material layer is flush with the baffle of the trolley, and the ignition temperature is 900°C.

[0017] While batching, mixing and granulating the lower layer mixture, 100% magnetite concentrate is batched, mixed and granulated. Before the second distribution, the alkalinity of the sintered mixture is 1.7, and the water weight...

Embodiment 2

[0023] Concrete technological process of the present invention is as figure 1 , in a 360m 2 , trolley railing height 800mm sintering machine, during the pre-sintering process production, through the batching, mixing and granulation system set up for the first distribution, 100% limonite and part of coke powder, limestone, quicklime and magnesite The batching, primary mixing and secondary granulation are carried out. Before the distribution, the alkalinity of the sinter mixture is controlled at 2.3, and the water weight percentage is at 8.0%. When distributing and igniting for the first time through the distributor 2 and the igniter 3, the height of the material layer is flush with the baffle of the trolley, and the ignition temperature is 1000°C.

[0024] While batching, mixing and granulating the lower layer mixture, 20% limonite and 80% hematite concentrate are batched, mixed and granulated. Before the second distribution, the alkalinity of the sintered mixture is 1.8 , th...

Embodiment 3

[0030] Concrete technological process of the present invention is as figure 1 , in a 360m 2 , trolley fence height 700mm sintering machine, when pre-sintering process production, through the batching, mixing and granulation system set for the first distribution, 100% limonite and part of coke powder, limestone, quicklime and magnesite The batching, primary mixing and secondary granulation are carried out, and the alkalinity of the sintered ore mixture is controlled at 2.35 and the water weight percentage is at 8.5% before distribution. When distributing and igniting for the first time through the distributor 2 and the igniter 3, the height of the material layer is flush with the baffle of the trolley, and the ignition temperature is 1050°C.

[0031] While batching, mixing and granulating the lower mixture, 35% limonite and 65% magnetite concentrate are mixed and granulated. Before the second distribution, the alkalinity of the sintered mixture is 1.9, Moisture weight percent...

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Abstract

The invention discloses a limonite super-thick material layer sintering method adopting pre-sintering. When a first layer of material is distributed, full limonite sintering is adopted, the basicity is high basicity of 2.25-2.35, on one hand, the content of high-strength calcium ferrite is increased, on the other hand, the liquid phase amount is increased during sintering, lots of holes generated during limonite sintering are filled, and limonite is made compact; after a second layer of material is laid, a heat preserving and material pressing effect is achieved on a bottom layer material to a certain extent, sufficient time and temperature are provided for curing crystallization of bottom layer sintered ore, influences of extreme cold on the sintered ore strength during full limonite sintering are also reduced, and the first layer of full limonite sintering becomes possible in terms of influences of the above pre-sintering technological characteristics. A second layer iron concentrate and limonite mixture makes two iron ore raw materials in different physical and chemical properties achieve characteristic complementation, and therefore the sintering technical index is improved.

Description

technical field [0001] The invention relates to a sintering production method of iron ore, in particular to a sintering production method adopting pre-sintered limonite ultra-thick material layer. Background technique [0002] Limonite is an important iron ore raw material for ironmaking, but due to its high crystal water content, coarse particle size, and small bulk specific gravity, it needs to consume a lot of fuel when it is sintered. At the same time, due to its low assimilation temperature and high porosity, it is easy to over-melt at high temperature during production and application, which makes the thermal air permeability of the sintered material layer worse, resulting in a decrease in sintering productivity and a decrease in cold strength, which limits limonite. The mixing ratio of ore in sintering production. At present, in existing reports, the proportion of limonite actually used in production does not exceed 60%. [0003] In the current limonite sintering pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/22
CPCC22B1/22
Inventor 唐复平刘杰周明顺翟立委姚林王义栋韩淑峰任子平张辉徐礼兵宫作岩吴远飞
Owner ANGANG STEEL CO LTD