Iron ore shaft furnace pelletizing process desulfurization method based on NH3 slow release binder

A binder and shaft furnace technology, applied in the field of iron and steel metallurgy, can solve the problems of heavy desulfurization system load, high operating cost, and increased concentration, and achieve the effects of increased decomposition temperature, improved desulfurization efficiency, and reduced decomposition speed

Active Publication Date: 2019-02-22
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the flue gas SO caused by the deterioration of iron ore pellet raw materials and the increase of sulfur content in the prior art. 2 Concentration increase, heavy desulfurization system load, and high operating costs provide a solution based on NH 3 Iron ore shaft furnace pelletizing process desulfurization method with slow-release binder, removes part of SO in the pellet production process 2 , which can reduce the SO in the exhaust gas of shaft furnace pellet production 2 Content, reduce exhaust gas desulfurization load, broaden pellet raw material sources and significantly reduce flue gas desulfurization cost

Method used

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  • Iron ore shaft furnace pelletizing process desulfurization method based on NH3 slow release binder
  • Iron ore shaft furnace pelletizing process desulfurization method based on NH3 slow release binder
  • Iron ore shaft furnace pelletizing process desulfurization method based on NH3 slow release binder

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Effect test

Embodiment 1

[0045] Such as Figure 1 to Figure 3 As shown, the NH-based 3 Desulfurization method of iron ore shaft furnace pelletizing process with slow-release binder, adding NH in the process of preparing green pellets 200 in iron ore shaft furnace 3 slow-release binder, green balls 200 enter the upper drying section 110 at the upper part of the shaft furnace, the temperature in the upper drying section 110 is 100-300°C, NH 3 Slow release binder releases NH when heated 3 and water vapor, and the SO-containing 2 Exhaust gases mix and react to form NH 4 HSO 4 , (NH 4 ) 2 SO 4 , NH 4 HSO 3 or (NH 4 ) 2 SO 3 , enter the dust in the subsequent dust removal process, that is, enter the flue gas in the form of dust, enrich in the dust removal system, and the SO in the exhaust gas 2 content decreased.

[0046] In this example, if figure 1 As shown, in the production process of shaft furnace pellets, the upper part of the shaft furnace is the upper drying section 110, the lower par...

Embodiment 2

[0068] Add 1% NH to the mixed iron concentrate 3 The slow-release binder is prepared into pellets with a diameter of 10-12mm. The sintering cup is used to simulate the drying, preheating and roasting process of the shaft furnace. The height of the green pellet layer is 50cm, the hot air temperature is 1000℃, and the SO 2 The average concentration in the concentrated discharge area is 812mg / m 3 , The process desulfurization rate reaches 39.85%.

Embodiment 3

[0070] Add 2% NH to the mixed iron concentrate 3 The slow-release binder is prepared into pellets with a diameter of 8-10mm. The sintering cup is used to simulate the drying, preheating and roasting process of the shaft furnace. The height of the green pellet layer is 50cm, the hot air temperature is 1000℃, and the SO 2 The average concentration in the concentrated discharge area is 879mg / m 3 , The process desulfurization rate reaches 34.89%.

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Abstract

The invention discloses an iron ore shaft furnace pelletizing process desulfurization method based on a NH3 slow release binder and belongs to the field of steel and iron metallurgy. According to themethod, the NH3 slow release binder is added to an iron ore shaft furnace in the fresh pellet preparation process, fresh pellets are fed into an upper drying section of the upper portion of the shaftfurnace, the NH3 slow release binder is heated to release NH3 and water vapor, the NH3 and the water vapor are mixed with waste gas containing SO2 generated at a lower preheating roasting section of the lower portion of the shaft furnace to have a reaction and get into dust in the follow-up dust removal process, and the SO2 content of the waste gas is reduced. The iron ore shaft furnace pelletizing process desulfurization method based on the NH3 slow release binder is provided for solving the problems that an iron ore pellet material is degraded, the concentration of flue gas SO2 is increaseddue to increasing of the sulfur content, and a desulfurization system is large in load and high in operation cost in the prior art, part of SO2 is removed in the pellet production process, the SO2 content in the waste gas can be reduced during pellet production of the shaft furnace, the desulfurization load of the waste gas can be reduced, the pellet material source can be broadened, and the desulfurization cost of flue gas can be remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, more specifically, relates to 3 Desulfurization method of iron ore shaft furnace pelletizing process with slow-release binder. Background technique [0002] Pellets are one of the commonly used iron-containing charges for blast furnace smelting. Acidic pellets combined with high-basicity sinter are currently the mainstream charge structure for blast furnaces in key enterprises in my country. The shaft furnace method is one of the three mainstream methods for the production of oxidized pellets, and plays an important role in the blast furnace charge preparation process. [0003] SO 2 It is one of the main air pollutants. It will be oxidized in the atmosphere to generate sulfuric acid mist or sulfate aerosol, which is an important precursor of environmental acidification. The concentration of sulfur dioxide in the atmosphere above 0.5ppm has a potential impact on the human body...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243C22B1/11
CPCC22B1/11C22B1/2406C22B1/243
Inventor 余正伟龙红明春铁军孟庆民任志祥钱立新狄瞻霞魏汝飞王平张中武向爱平王毅璠罗云飞丁龙
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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