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Method for treating nitrogen oxide in tail gas of rotary kiln

A nitrogen oxide and rotary kiln technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problem of unqualified exhaust nitrogen oxide emissions and achieve the effect of reducing the content

Inactive Publication Date: 2019-11-15
HENAN YUGUANG ZINC IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is: Aiming at the technical problem in the prior art that the discharge of nitrogen oxides in tail gas is unqualified when the rotary kiln volatilization method is used to treat leaching slag, the present invention provides a method for treating nitrogen oxides in the tail gas of a rotary kiln

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The present invention controls the method for rotary kiln tail gas nitrogen oxides, and this treatment method comprises the following steps:

[0027] a. Firstly, the initial ammonia water with a concentration of 15% is placed in the ammonia preparation tank, and desalted water is added to prepare the ammonia water with a concentration of 4%;

[0028] b, the concentration of step a configuration is 4% ammonia water is prepared into ammonia vapor by using an ammonia water evaporator;

[0029] c. Send the ammonia vapor obtained in step b into the rotary kiln through the atomizing spray gun installed at the rear of the rotary kiln (the angle between the atomizing spray gun and the axial direction of the rotary kiln is 50 degrees), and the pressure of the ammonia vapor is controlled to be 0.4 MPa, mixed reaction with the flue gas produced by the rotary kiln. After the mixed reaction, the ammonia gas reduces the nitrogen oxides to nitrogen and water, and the discharge meets t...

Embodiment 2

[0032] The present invention controls the method for rotary kiln tail gas nitrogen oxides, and this treatment method comprises the following steps:

[0033] a. Firstly, the initial ammonia water with a concentration of 18% is placed in the ammonia preparation tank, and desalted water is added to prepare the ammonia water with a concentration of 3%;

[0034] b, the concentration of step a configuration is 3% ammonia water is prepared into ammonia vapor by using an ammonia water evaporator;

[0035] c, the ammonia vapor obtained in step b is sent into the rotary kiln through the atomizing spray gun installed at the rear of the rotary kiln kiln (the angle between the atomizing spray gun and the axial direction of the rotary kiln is 30 degrees), and the pressure of the ammonia vapor is controlled to be 0.5 MPa, mixed reaction with the flue gas produced by the rotary kiln. After the mixed reaction, the ammonia gas reduces the nitrogen oxides to nitrogen and water, and the discharge...

Embodiment 3

[0038] The present invention controls the method for rotary kiln tail gas nitrogen oxides, and this treatment method comprises the following steps:

[0039] a. Firstly, the initial ammonia water with a concentration of 20% is placed in the ammonia preparation tank, and desalted water is added to prepare the ammonia water with a concentration of 5%;

[0040] b, the concentration of 5% ammonia water configured in step a is prepared into ammonia vapor by using an ammonia water evaporator;

[0041] c. Send the ammonia vapor obtained in step b into the rotary kiln through the atomizing spray gun installed at the rear of the rotary kiln (the angle between the atomizing spray gun and the axial direction of the rotary kiln is 60 degrees), and the pressure of the ammonia vapor is controlled to be 0.6 MPa, mixed reaction with the flue gas produced by the rotary kiln. After the mixed reaction, the ammonia gas reduces the nitrogen oxides to nitrogen and water, and the discharge meets the ...

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PUM

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Abstract

The invention discloses a method for treating nitrogen oxide in tail gas of a rotary kiln. The method for treating the nitrogen oxide in the tail gas of the rotary kiln comprises the steps of firstly,placing initial ammonium hydroxide in an ammonium hydroxide production tank, and adding demineralized water to produce ammonium hydroxide with a concentration of 1-5%; producing ammonia vapour from the ammonium hydroxide with the concentration of 1-5% by means of an ammonium hydroxide evaporator; and sending the ammonia vapour into the rotary kiln through an atomizing spray gun, and carrying outa mixing reaction on the ammonia vapour and smoke generated by the rotary kiln, wherein after the mixing reaction is carried out, the nitrogen oxide is reduced by ammonia gas to nitrogen and water, and treated tail gas is subjected to up-to-standard discharge. According to the technical scheme, under a working condition of the rotary kiln, the treated ammonia vapour is introduced, so that the content of the nitrogen oxide in the tail gas is effectively reduced. The method and an existing technology of treating leaching residues by means of a rotary kiln volatilization method are combined so that up-to-standard discharge of the treated tail gas can be ensured without affecting the existing production technology.

Description

[0001] 1. Technical field: [0002] The invention belongs to the technical field of zinc smelting tail gas treatment in the nonferrous metal smelting industry, and in particular relates to a method for treating nitrogen oxides in the tail gas of a rotary kiln. [0003] 2. Background technology: [0004] At present, the zinc produced by the hydrometallurgy process accounts for more than 80% of the world’s zinc production, and a large amount of leaching slag will be produced in the process of hydrometallurgy zinc smelting. The leaching slag treatment methods mainly include wet method and fire method, among which the rotary kiln The volatilization method is a typical process for pyroprocessing leaching slag. This method is mature and widely used, and is widely used in large-scale zinc smelters. [0005] With the increasingly stringent environmental protection requirements, the tail gas produced by the rotary kiln volatilization method for leaching slag must undergo advanced treatm...

Claims

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Application Information

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IPC IPC(8): B01D53/76B01D53/56
CPCB01D53/56B01D53/76B01D2251/2062B01D2258/025
Inventor 倪恒发张继森翟爱萍赵晨阳张富兵李飞
Owner HENAN YUGUANG ZINC IND
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