Iron oxide red pigment two-step oxidation process waste gas treatment method

An oxidation process, iron oxide red technology, applied in chemical instruments and methods, separation methods, air quality improvement, etc., can solve the problem that exhaust gas treatment devices and methods cannot meet the emission requirements, and achieve the goal of improving absorption efficiency and oxidation degree Effect

Inactive Publication Date: 2018-06-19
TAIKANG KITCHEN SCI TECH SUZHOU CITY
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  • Abstract
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  • Claims
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Problems solved by technology

If the maximum allowable emission concentration at the chimney outlet is 240mg / m according to the current standard GB16297-1996 3 , the minimum absorption rate of up-to-standard emissions is above 88%, so the existing exhaust gas treatment devices and methods cannot meet the emission requirements

Method used

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  • Iron oxide red pigment two-step oxidation process waste gas treatment method
  • Iron oxide red pigment two-step oxidation process waste gas treatment method
  • Iron oxide red pigment two-step oxidation process waste gas treatment method

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Embodiment 1

[0043] Embodiment one: the exhaust gas produced by the two-step oxidation process of iron oxide red pigment (also can be referred to as NO X The main components of exhaust gas) include steam, air, nitrogen oxides and trace iron red particles. An iron oxide red pigment two-step oxidation process waste gas treatment device for treating the above waste gas is as attached figure 1 As shown, it includes a tubular heat exchanger 1, a concentrated nitric acid oxidation tower 2, a dilute nitric acid absorption tower 3, a sodium hydroxide absorption tower 4, and a urea solution absorption tower 5 connected in sequence.

[0044] as attached figure 2As shown, the tubular heat exchanger 1 is connected to the device for the two-step oxidation process, that is, the oxidation barrel, and input the exhaust gas to be treated, which is used to remove the steam and iron red particles in the exhaust gas by heat exchange and cooling to generate a level exhaust gas. The tubular heat exchanger 1...

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Abstract

The invention relates to an iron oxide red pigment two-step oxidation process waste gas treatment method, which comprises: 1, removing steam and iron red particles from waste gas by using a heat exchange cooling method to generate first-stage waste gas; 2, oxidizing NO in the first-stage waste gas into NO2 by using N2O4 removed concentrated nitric acid to generate second-stage waste gas; 3, removing NO2 and NO from the second-stage waste gas by using N2O4 removed dilute nitric acid to generate third-stage waste gas; 4, further removing NO2 and NO from the third-stage waste gas by using a sodium hydroxide solution to generate fourth-stage waste gas; and 5, reducing NO2 in the fourth-stage waste gas into N2 by using a urea solution so as to generate fifth-stage waste gas, wherein the fifth-stage waste gas achieves the discharge standard. According to the present invention, with the iron oxide red pigment two-step oxidation process waste gas treatment method, the oxidation degree of the waste gas treatment can be increased, the absorption efficiency of the waste gas treatment can be increased, and the final waste gas can meet the discharge standard.

Description

technical field [0001] The invention belongs to the field of industrial waste gas treatment, and in particular relates to a method for treating waste gas containing nitrogen oxides produced by a two-step oxidation process of iron oxide red pigment. Background technique [0002] In the two-step oxidation process of iron oxide red pigment, the device for the two-step oxidation process—the main raw materials in the oxidation barrel include: water, iron sheet, ferrous nitrate, ferrous sulfate, and at the same time, during the oxidation reaction process, the continuous flow into steam and air. [0003] Fe(No 3 ) 2 Oxidized to Fe(ON) 3 Nitric acid is produced when: [0004] [0005] Due to the presence of nitric acid (dilute nitric acid), side reactions occur during the two-step oxidation: [0006] [0007] Therefore, the exhaust gas of the oxidation barrel contains a certain amount of NO gas, and because steam needs to be added in the second-step oxidation process, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/78
CPCB01D53/56B01D53/78B01D2251/2067B01D2251/304B01D2251/506B01D2251/604Y02A50/20
Inventor 薛家华胡坚薛诗凡
Owner TAIKANG KITCHEN SCI TECH SUZHOU CITY
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