Medium alkalinity thick material layer sintering production method

A production method and technology of thick material layer, which are applied in the field of sintering production of medium basicity and thick material layer, can solve the problems such as the inability to meet the large-scale blast furnace, the optimization of particle size, and the lack of creativity, and the automatic heat storage effect can be enhanced and improved. Effects of sintered air permeability, improved quality and yield

Active Publication Date: 2017-07-14
唐山瑞丰钢铁(集团)有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0002] In the 1980s, major domestic iron and steel enterprises increased the sintering production capacity by increasing the thickness of the sintering material layer, but the thickness of the sintering material layer in most enterprises was only 750-850 mm. Such thick material layer sintering production cannot meet the development situation of large-scale blast furnaces. Seriously restrict blast furnace production
[0006] 1. Consuming quicklime before adding is the technical means that all manufacturers are currently adopting, which is not creative;
[0007] 2. Add water to the mixer for atomization, specifically regarding water control, temperature control, and control of the particle size of the mixture, no optimization is proposed
[0008] 3. The control of the sintering machine in the sintering process is automatically controlled by the instrument, but the control range of process parameters such as sintering machine speed, sintering time, vertical sintering speed, and ignition temperature have not been proposed.
The main problem is that the lifting of the sinter layer does not stabilize the quality and output of sinter, which restricts the blast furnace smelting

Method used

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  • Medium alkalinity thick material layer sintering production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weight percentage of sintering ingredients: limonite 52%, blast furnace return ore 14%, sinter machine return ore 14%, dedusting ash 1%, iron oxide scale 5%, dolomite powder 5%, lime 5%, coal powder 4%;

[0041] After the batching is completed, mix and granulate the raw materials. The mixing time is 2.5 minutes, and the granulation time is 2.5 minutes. Ensure that the raw material temperature is 60-70 °C and the water content is 7-8%;

[0042] When laying raw materials, the thickness of the bottom material is 100mm, and the thickness of the sintered raw material is 900mm, and the material is not pressed;

[0043] Ignition temperature 1050±20℃, ignition time 1.5min, sintering negative pressure 15KPa; sintering speed: 1.25m / min, vertical burning speed: 22.5mm / min;

[0044] Cool after sintering, the cooling negative pressure is 11-16Kpa, the air leakage rate is less than 40%, and the sinter temperature after cooling is below 250°C.

[0045] Finally, it is crushed and scre...

Embodiment 2

[0048] Weight percentage of sintering ingredients: limonite 53%, blast furnace return ore 12%, sinter machine return ore 12%, dedusting ash 6%, iron oxide scale 5%, dolomite powder 4%, lime 4.5%, coal powder 3.5%;

[0049] After the batching is completed, the raw materials are mixed and granulated. The mixing time is 3 minutes, and the granulation time is 3 minutes. The raw material temperature is 60-70 °C and the water content is 7-8%.

[0050] When laying raw materials, the thickness of the bottom material is 100mm, and the thickness of the sintered raw material is 980mm, and the material is not pressed;

[0051] Ignition temperature 105±20°C, ignition time 1.7min, sintering negative pressure 15KPa; sintering speed: 1.36m / min, vertical burning speed: 26.66mm / min;

[0052] Cooling after sintering, cooling negative pressure 11 ~ 16Kpa, air leakage rate < 40%, sinter temperature after cooling below 250°C;

[0053] Finally, it is crushed and screened. If the particle size is less...

Embodiment 3

[0056] Weight percentage of sintering ingredients: limonite 54.5%, blast furnace return ore 11%, sinter return ore return 13%, dedusting ash 3%, iron oxide scale 5%, dolomite powder 4%, lime 5.5%, coal powder 4%;

[0057] After the batching is completed, the raw materials are mixed and granulated. The mixing time is 3 minutes, and the granulation time is 3.5 minutes. The raw material temperature is 60-70 °C and the water content is 7-8%.

[0058] When laying raw materials, the thickness of the bottom material is 100mm, and the thickness of the sintered raw material is 1000mm, and the material is not pressed;

[0059] Ignition temperature 105±20°C, ignition time 1.5min, sintering negative pressure 15KPa; sintering speed: 1.38m / min, vertical burning speed: 27.6mm / min;

[0060] Cooling after sintering, cooling negative pressure 11 ~ 16Kpa, air leakage rate < 40%, sinter temperature after cooling below 250°C;

[0061] Finally, it is crushed and screened. If the particle size is l...

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Abstract

The invention relates to a production method for sintering a medium alkalinity thick material layer. The weight percentage of the sintering ingredients is: limonite 50-56%, iron oxide scale 5%, dust removal ash 2-6%, sintering machine return ore 12-14%, blast furnace return ore 11-15%, dolomite powder 4-5% , lime 4~5%, coal powder 3~5%; mixing and granulation time 2.5~3.5min; bottom material layer thickness 100mm, sintering raw material thickness 900mm~1000mm; ignition temperature 1050±20℃, sintering time 1.5~1.8 min, sintering negative pressure 13-15Kpa; cooling negative pressure 11-16Kpa, cold air rate ≤ 40%, sinter temperature after cooling below 250°C; Increase the yield of sintered ore, increase the output of sintering, and realize energy saving and consumption reduction in sintering.

Description

technical field [0001] The invention relates to the field of sintered ore production, in particular to a production method for sintering a medium-alkalinity thick material layer. Background technique [0002] In the 1980s, major domestic iron and steel enterprises increased the sintering production capacity by increasing the thickness of the sintering material layer, but the thickness of the sintering material layer in most enterprises was only 750-850 mm. Such thick material layer sintering production cannot meet the development situation of large-scale blast furnaces. Seriously restrict blast furnace production. For example, a company has a 160m 2 Walking sintering machine and 2 sets of 120m 2 For the step-by-step sintering machine, the thickness of the sintering material layer is always controlled at 600-800mm, the thickness of the sintering material layer is relatively thin, and the sintering yield is low, only about 70%. [0003] In recent years, individual large iro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/16
Inventor 齐超群李雪松侯朝君孙荣志周涛吴鹏崔志永孙仕良刘松黄昆奕房欣张超
Owner 唐山瑞丰钢铁(集团)有限公司
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