Method for inhibiting emission of fine particles in process of iron-ore sintering by agglomeration process

A technology of fine particles and sintering process, applied in separation methods, chemical instruments and methods, separation of dispersed particles, etc., can solve problems such as complex composition, complex flue gas composition, and large flue gas flow

Active Publication Date: 2016-07-27
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] (5) The composition of the flue gas is complex, which contains a variety of pollutants, such as: fine particulate matter, SO 2 , COx, NOx, HCl, HF and dioxins, etc.
Such as: the name of the invention: industrial kiln flue gas PM 2.5 Dust and heavy metal treatment and removal device [9] , (Chinese patent number: ZL201220721358.X, application date: 2012-12-24), by setting a filter bag on the flue gas passage, and placing the bag cage inside the filter bag, the PM 2.5 Dust emission reduction; this technology has a good emission reduction effect on large particle pollutants, but the PM in the flue gas 2.5 The emission reduction effect is limited
In addition, the name of the invention is: a method for segmental circulation of iron ore sintering flue gas [10] (Chinese

Method used

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  • Method for inhibiting emission of fine particles in process of iron-ore sintering by agglomeration process
  • Method for inhibiting emission of fine particles in process of iron-ore sintering by agglomeration process
  • Method for inhibiting emission of fine particles in process of iron-ore sintering by agglomeration process

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Example Embodiment

[0065] Example 1

[0066] Combine Picture 10 with Picture 11 As shown, this embodiment sinters an agglomeration method to suppress the emission of fine particles in the iron ore sintering process: the specific emission reduction steps are:

[0067] Step 1: Prepare agglomeration liquid

[0068] (A) Weigh 10g of polyaluminum chloride, 30g of sodium carboxymethylcellulose, 30g of polyacrylamide, 10g of solid particles of polyaluminum chloride, 30g of sodium carboxymethylcellulose, and 30g of polyacrylamide by mass. , Get mixture A;

[0069] (B) Weigh 2 g of the additive by mass, the additive is a solid additive, add it to the mixture A and mix it evenly to obtain a composite agglomeration agent;

[0070] (C) Mix the composite agglomeration agent in step (B) with water, and stir and mix evenly, and the mass ratio of the agglomeration agent to water is 1:5000, and then add Ca(OH) 2 The pH of the powder adjusting solution is 8.5, and the agglomeration liquid is prepared;

[0071] Step 2: A...

Example Embodiment

[0115] Example 2

[0116] The basic content of this embodiment is the same as that of embodiment 1, and the difference is that the additive is composed of activated carbon and zeolite, and the additive is composed of the following mass percentages: 85% of activated carbon and 15% of zeolite. The particle size requirements of the activated carbon are: 74μm≤activated carbon particle size≤100μm, zeolite particle size requirement: 74μm≤zeolite particle size≤100μm.

[0117] The emission concentration of PM2.5 and PM10 in the sintering flue gas after the dust removal device 4 is detected, and the emission reduction efficiency of PM2.5 and PM10 is calculated. The emission reduction efficiency of PM2.5 is 56.4%, and the emission reduction efficiency of PM10 is 49.0%.

Example Embodiment

[0118] Example 3

[0119] The basic content of this embodiment is the same as that of embodiment 1, and the difference is that the additive is composed of activated carbon and zeolite, and the additive is composed of the following mass percentages: activated carbon 95%, zeolite 5%.

[0120] The emission concentration of PM2.5 and PM10 in the sintering flue gas after the dust removal device 4 is detected, and the emission reduction efficiency of PM2.5 and PM10 is calculated. The emission reduction efficiency of PM2.5 is 60.2%, and the emission reduction efficiency of PM10 is 48.8%.

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Abstract

The invention discloses a method for inhibiting emission of fine particles in the process of iron-ore sintering by an agglomeration process and belongs to the technical field of emission reduction of pollutants in the process of iron-ore sintering. The method comprises the following steps: (1) preparing agglomeration liquid, namely uniformly mixing components such as sodium carboxymethyl cellulose, polyacrylamide and an additive to obtain an agglomeration agent, and mixing the agglomeration agent and water to obtain the agglomeration liquid; (2) agglomerating fine particles, namely spraying the agglomeration liquid into flue gas to cause fine particles in the sintering flue gas to be agglomerated to grow larger under the action of the agglomeration liquid; and (3) trapping by a dust removing device, namely trapping and removing the fine particles agglomerated to grow larger by the dust removing device. The method disclosed by the invention has the advantages that agglomeration liquid droplets adsorbing the fine particles are nucleated and collide with each other and grow to form large-particle agglomerates under the condition of low pressure, and a dust-removing device is adopted to remove the fine particles agglomerated to be larger, so that an all-new emission-reducing path is provided for reducing the emission of fine particles in the process of iron-ore sintering.

Description

technical field [0001] The invention relates to the technical field of pollutant emission reduction in the iron ore sintering process, and more specifically, relates to a method for suppressing the discharge of fine particulate matter in the iron ore sintering process by agglomeration. Background technique [0002] Inhalable particulate matter refers to the general term for particulate matter that can enter the human respiratory tract through the nose and mouth, represented by PM10 (particles with an aerodynamic diameter of less than 10 microns in the ambient air). PM2.5 refers to particulate matter in the ambient air with an aerodynamic equivalent diameter less than or equal to 2.5 microns. It can be suspended in the air for a long time, and the higher its concentration in the air, the more serious the air pollution. Although PM2.5 is only a small component of the earth's atmospheric composition, it has an important impact on air quality and visibility. Compared with coar...

Claims

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Application Information

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IPC IPC(8): B01D51/02
CPCB01D51/02
Inventor 春铁军吴雪健龙红明李家新狄瞻霞王平孟庆民宁超钱立新王欢
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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