Sintering method of super-thick material layer sinter

A sintering method and technology of sintering ore, which is applied in the field of metallurgy, can solve problems such as the lack of uniform sintering of the material layer, the clogging of the particle gaps in the material layer, and the increase in the resistance of the material layer, so as to reduce the air leakage rate, reduce the concentration of NOx emissions, and reduce carbon dioxide emissions. The effect of content increase

Inactive Publication Date: 2020-12-15
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the ignition intensity tends to melt the surface of the thick material layer, block the gaps between the material layer particles, and increase the resistance of the entire material layer. The negative pressure and air volume of the fan must be increased, resulting in local short-circuit of the air flow, and the material layer cannot achieve uniform sintering. , leading to a substantial increase in energy consumption, that is, no breakthrough has been made in the sintering of ultra-thick material layers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Ingredients: The order of feeding is iron-containing raw materials, coke powder, quicklime, limestone, dolomite, returned ore, and dedusting ash. The mass percentages of each raw material are: iron-containing raw materials=88, fuel=4.0, quicklime 6.0 , limestone=1.0, dolomite=1.0; return ore and dedusting ash are used as sintering cycle materials, and the dosage is calculated according to "return ore / dust ÷ (iron-containing raw material + fuel + quicklime + dolomite + limestone)", return ore = 14.1%, dust removal=1.3. Each material is fed to the mixing belt 1 through the batching scale, and a distributor (after the dolomite feeding point) is added on the mixing belt 1 to form a groove in the middle of the material, and the desulfurization wastewater (preheating the wastewater with steam to increase the material temperature) ) into the groove of the material to digest the quicklime in advance.

[0033] (2) Mixing and granulation: iron-containing raw materials, fuel,...

Embodiment 2

[0040] (1) Ingredients: The order of feeding is iron-containing raw materials, coke powder, quicklime, limestone, dolomite, returned ore, and dedusting ash. The mass percentages of each raw material are: iron-containing raw materials = 87.7, fuel = 4.0, quicklime 6.5 , limestone = 0.8, dolomite = 1.0; return ore and dedusting ash are used as sintering cycle materials, and the dosage is calculated according to "return ore / dust ÷ (iron-containing raw material + fuel + quicklime + dolomite + limestone)", return ore = 15.1, dust removal = 1.5. Each material is fed to the mixing belt 1 through the batching scale, and a distributor (after the dolomite feeding point) is added on the mixing belt 1 to form a groove in the middle of the material, and the desulfurization wastewater (preheating the wastewater with steam to increase the material temperature) ) into the groove of the material to digest the quicklime in advance.

[0041] (2) Mixing and granulation: iron-containing raw mater...

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PUM

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Abstract

The invention provides a sintering method of super-thick material layer sinter. The thickness of a sintering material layer is 920-950mm, the sintering moisture is 6.2-6.4%, and the sintering negativepressure is 14.5-15.5kPa. The sintering method comprises the specific steps of (1) burdening, (2) mixing and pelletizing, (3) mixture preheating, (4) micro-negative pressure ignition, and (5) material loosening. According to the sintering method, through development and application of a low-moisture pelletizing technology, low-pressure steam efficient preheating of a mixture is conducted to increase the material temperature, development and application of a micro-negative pressure ignition technology and transformation and application of three rows of material loosening devices, the thicknessof the material layer is increased, the machine speed of a sintering machine is decreased, the sintering crystallization reaction is promoted, the internal return mine rate is decreased, and the quality and yield of the sinter are improved; the thickness of the material layer is increased to 930mm or above from 730mm, the sintering negative pressure is decreased to 14.5kPa-15.5kPa from 16.0kPa-17.0kPa, low-power-consumption and low-fuel-consumption sintering under the super-thick material layer condition is achieved, and the sintering cost is reduced; and NOx emission of sintering raw flue gas is reduced by about 37%, and efficient process emission reduction of the sintering flue gas NOx is achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a low-water and low-negative-pressure sintering method for super-thick material layer sintering ore. [0002] technical background [0003] Sintering is one of the main charge processing processes in the modern steel production process, and it is also the first high-temperature process in steel production. Its high energy consumption and heavy pollution load seriously restrict the green development of the steel industry. For the 920-950mm ultra-thick material layer, the low-water and low-negative-pressure sintering method can significantly reduce the solid fuel consumption of sintering, increase the strength of the sinter drum and the output of sintering ore, and reduce the cost of sintering ore and blast furnace ironmaking. At the same time, the reduction of solid fuel reduces the concentration of pollutants such as NOx and CO in the sintering raw flue gas, significantly reduces ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C22B1/24
CPCC22B1/16C22B1/2406
Inventor 汤乐云邹凡球赵改革罗文平苏建军梁高铭周云花王水根何二喜王岿高有才石畑翚
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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