Treating agent for reducing ammonia escape concentration in cement kiln tail gas and preparation method thereof

Abstract

The invention belongs to the technical field of additives, and discloses a treating agent for reducing ammonia escape concentration in cement kiln tail gas and a preparation method of the treating agent. The treatment agent comprises 10 to 16 parts of an adsorbent, 1 to 5 parts of a precipitating agent, 0.2 to 0.5 part of a metal buffering agent, 0.1 to 0.3 part of a surfactant and 20 to 32 parts of water. The treating agent disclosed by the invention solves the problem that the ammonia escape concentration in the cement kiln tail gas exceeds the standard due to excessive ammonia spraying in a denitration project, avoids the risk of secondary pollution caused by ammonia emission, and meets the national ultra-low emission limit requirement. Meanwhile, the treating agent is non-toxic and harmless, low in cost, simple in field operation and low in equipment investment, and assists and enables green development of cement enterprises.

Description

Technical Field

[0001] The present invention relates to the technical field of admixtures, and in particular to a treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas and a preparation method thereof. Background Art

[0002] The cement industry currently mainly uses ammonia or urea and NO x The reaction achieves the purpose of denitrification, and the ammonia escape problem caused by cement denitrification projects has attracted widespread attention from the society.

[0003] Currently, the most common denitrification methods are SNCR (Selective Non-Catalytic Reduction) and SCR (Selective Catalytic Reduction). SNCR technology requires simple equipment, does not require a catalyst, and has low operating costs. However, its denitrification efficiency is low (30-70%) and its ammonia slip rate is high (>10ppm), making it difficult to meet ultra-low emission requirements. SCR technology offers high denitrification efficiency (over 70-95%) and a low ammonia slip rate (<3ppm), making it suitable for stringent emission standards. However, its investment and operating costs are high, the system is complex, and the equipment requires a large footprint.

[0004] Therefore, developing an ammonia escape treatment agent product with low ammonia escape rate, easy on-site use, simple equipment, and low investment cost is a technical problem that needs to be solved at present. Summary of the Invention

[0005] The purpose of the present invention is to provide a treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas and a preparation method thereof, so as to solve the technical problem that ammonia escape in cement kiln tail gas exceeds the standard and cannot meet the ultra-low emission requirements.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas, comprising the following raw materials in parts by mass:

[0008] 10-16 parts of adsorbent, 1-5 parts of precipitant, 0.2-0.5 parts of metal buffer, 0.1-0.3 parts of surfactant, and 20-32 parts of water.

[0009] Preferably, the adsorbent comprises one or more of ethylene glycol, glycerol and isoamyl alcohol.

[0010] Preferably, the adsorbent comprises ethylene glycol, glycerol and isoamyl alcohol in a mass ratio of 1-3:0.5-2:2-5.

[0011] Preferably, the precipitant comprises one or more of aluminum sulfate, copper sulfate and zinc sulfate.

[0012] Preferably, the precipitant comprises aluminum sulfate, copper sulfate and zinc sulfate in a mass ratio of 0.5-2:1-3:2-3.

[0013] Preferably, the metal buffer comprises one or more of copper chloride, cobalt chloride and magnesium chloride.

[0014] Preferably, the metal buffer comprises copper chloride, cobalt chloride and magnesium chloride in a mass ratio of 1.5-4:1-2:2-3.

[0015] Preferably, the surfactant comprises one or more of sodium dodecylbenzenesulfonate, sodium dodecyl sulfate and sodium α-olefinsulfonate.

[0016] Preferably, the surfactant comprises sodium dodecylbenzenesulfonate, sodium dodecyl sulfate and sodium α-olefinsulfonate in a mass ratio of 1 to 5: 2 to 4: 2 to 3.

[0017] The present invention also provides a method for preparing a treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas, comprising the following steps:

[0018] The adsorbent is stirred and mixed with water, and then a metal buffer, a precipitant and a surfactant are added in sequence and stirred and mixed to obtain a treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas.

[0019] It can be seen from the above technical solutions that compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The ammonia escape treatment agent of the present invention effectively adsorbs ammonia in the tail gas through the coordination and complexation of the metal ions and adsorbent in the treatment agent with ammonia and the hydrogen bonding of the hydroxyl groups, thereby increasing the ammonia concentration around the precipitant in the treatment agent, and prompting the precipitant component to react quickly with ammonia during the contact process with the tail gas, thereby achieving a rapid and efficient reduction in the ammonia concentration. The generated reaction product has good stability and will not re-decompose ammonia at high temperatures, ensuring that the ammonia concentration in the treated tail gas will not rebound. Among them, the metal buffer can maintain the optimal pH of the system, avoiding the reduction of reaction efficiency due to excessively high or low pH values; the surfactant can significantly reduce the surface tension of the liquid, promote the transfer of NH3 from the gas phase to the liquid phase, improve the mass transfer efficiency, kinetically promote the above-mentioned reaction to proceed in the forward direction, and reduce the possibility of ammonia escape.

[0021] (2) The components of the ammonia escape treatment agent of the present invention interact with each other. By adjusting and optimizing the dosage ratio of the components, the ammonia escape concentration is significantly reduced after the ammonia escape treatment agent is added to the cement kiln exhaust gas, which can greatly meet the national ultra-low emission requirements. At the same time, the treatment agent is a liquid product, non-toxic and harmless. When used on site, it is pumped and atomized by a nozzle and then sprayed into the cement kiln exhaust gas in the form of a spray, which requires little investment and is easy to operate.

[0022] (3) The application of the ammonia escape treatment agent of the present invention can reduce the ammonia escape concentration in the cement kiln exhaust gas from 70 ppm to about 2 ppm, significantly reducing the ammonia escape concentration in the exhaust gas. The reaction rate is fast, the product is highly stable, and it does not decompose at high temperatures. It effectively solves the problem of excessive ammonia escape in the cement kiln exhaust gas, minimizes the external emission of excessive ammonia, meets the national ultra-low emission policy requirements, reduces environmental pollution and personnel hazards, and also contributes to the green development of cement enterprises. DETAILED DESCRIPTION

[0023] The present invention provides a treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas, comprising the following raw materials in parts by mass:

[0024] 10-16 parts of adsorbent, 1-5 parts of precipitant, 0.2-0.5 parts of metal buffer, 0.1-0.3 parts of surfactant, and 20-32 parts of water.

[0025] In the present invention, the mass fraction of the adsorbent is preferably 11 to 15 parts, more preferably 12 to 14 parts, and even more preferably 13 parts.

[0026] In the present invention, the adsorbent preferably comprises one or more of ethylene glycol, glycerol and isoamyl alcohol, and more preferably comprises ethylene glycol, glycerol and isoamyl alcohol.

[0027] In the present invention, the adsorbent comprises ethylene glycol, glycerol and isoamyl alcohol in a mass ratio preferably of 1-3:0.5-2:2-5, more preferably 1.5-2.5:0.9-1.6:2.5-4.5, and more preferably 2:1.1-1.4:3.2-3.8.

[0028] In the present invention, the adsorbent is an organic alcohol substance, and the hydroxyl group in the substance can combine with ammonia through hydrogen bonds, that is, the hydroxyl group in the adsorbent acts as a hydrogen donor and combines with ammonia nitrogen as a hydrogen acceptor through hydrogen bonds (OH···N), thereby promoting the ammonia in the tail gas to be quickly adsorbed from the gas phase into the ammonia escape treatment agent. The hydrogen bonding force is greater than the free diffusion force of ammonia molecules in the gas-liquid two-phase, and can effectively increase the ammonia concentration around the precipitant in the treatment agent, providing a favorable basis for the subsequent reaction between the precipitant and ammonia.

[0029] In the present invention, the weight percentage of the precipitant is preferably 1.5 to 4.5 parts, more preferably 2 to 4 parts, and even more preferably 2.5 to 3.5 parts.

[0030] In the present invention, the precipitant preferably comprises one or more of aluminum sulfate, copper sulfate and zinc sulfate, and further preferably comprises aluminum sulfate, copper sulfate and zinc sulfate.

[0031] In the present invention, the precipitant comprises aluminum sulfate, copper sulfate and zinc sulfate in a mass ratio preferably of 0.5-2:1-3:2-3, more preferably of 0.8-1.5:1.5-2.5:2.2-2.8, and more preferably of 1-1.3:2:2.4-2.6.

[0032] In the present invention, the precipitant is mainly a sulfate substance, which can react with ammonia water at room temperature to generate ammonium sulfate and precipitate. The higher the temperature, the faster the reaction rate and the better the effect. Among them, ammonium sulfate will only start to decompose into ammonia at 280°C and is relatively stable below 280°C. The temperature of cement kiln exhaust gas is generally less than 200°C, so the generated product ammonium sulfate can exist stably in the cement kiln exhaust gas and will not decompose into ammonia again. This provides strong support for the elimination of escaping ammonia. The specific chemical reaction formula is as follows (1):

[0033] M n+ +SO4 2- +n NH3+n H2O→M(OH)n↓+(NH4)2SO4 (1)

[0034] In the present invention, the mass fraction of the metal buffer is preferably 0.25 to 0.45 parts, more preferably 0.3 to 0.4 parts, and even more preferably 0.34 to 0.36 parts.

[0035] In the present invention, the metal buffer preferably comprises one or more of copper chloride, cobalt chloride and magnesium chloride, and more preferably comprises copper chloride, cobalt chloride and magnesium chloride.

[0036] In the present invention, the metal buffer comprises copper chloride, cobalt chloride and magnesium chloride in a mass ratio preferably of 1.5-4:1-2:2-3, more preferably 2-3.5:1.2-1.8:2.2-2.8, and more preferably 2.5-3:1.4-1.6:2.4-2.6.

[0037] In the present invention, the metal buffer is an inorganic metal chloride salt, which has two main functions. First, it adsorbs ammonia through the complex adsorption principle, that is, the metal ion and NH3 are complexed to form a complex ion, thereby adsorbing ammonia and accelerating the subsequent reaction rate. Second, the optimal environment for the reaction of the ammonia escape treatment agent with ammonia is a weakly acidic environment, so the reaction process needs to be maintained in a weakly acidic environment. The chloride in the metal buffer is weakly acidic after hydrolysis, which can stabilize the pH value of the ammonia escape treatment agent during the entire reaction process to a certain extent and prevent the pH value from fluctuating violently. A stable pH value helps to maintain the optimal reaction conditions, ensure a more thorough reaction, and reduce ammonia escape.

[0038] In the present invention, the mass fraction of the surfactant is preferably 0.12 to 0.28 parts, more preferably 0.15 to 0.25 parts, and even more preferably 0.19 to 0.21 parts.

[0039] In the present invention, the surfactant preferably comprises one or more of sodium dodecylbenzenesulfonate, sodium dodecyl sulfate and sodium α-olefin sulfonate, and further preferably comprises sodium dodecylbenzenesulfonate, sodium dodecyl sulfate and sodium α-olefin sulfonate.

[0040] In the present invention, the surfactant comprises sodium dodecylbenzenesulfonate, sodium dodecyl sulfate and sodium α-olefinsulfonate in a mass ratio preferably of 1-5:2-4:2-3, more preferably 2-4:2.5-3.5:2.2-2.8, and more preferably 2.5-3.5:2.8-3.2:2.5.

[0041] In the present invention, the surfactant can significantly reduce the surface tension of the ammonia escape treatment agent liquid, promote the transfer of NH3 from the gas phase to the liquid phase during the contact process between ammonia and the ammonia escape treatment agent, and improve the mass transfer efficiency; at the same time, it increases the contact area between ammonia and the precipitant, metal buffer, etc. in the treatment agent, accelerates the reaction rate of complex adsorption and precipitation reaction, increases the unit volume concentration of ammonia in the treatment agent, kinetically promotes the reaction to proceed in the forward direction, promotes the depth of ammonia consumption, and thus reduces the possibility of ammonia escape.

[0042] In the present invention, the mass fraction of the water is preferably 22 to 30 parts, more preferably 24 to 28 parts, and even more preferably 25 to 27 parts.

[0043] The present invention also provides a method for preparing a treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas, comprising the following steps:

[0044] The adsorbent is stirred and mixed with water, and then a metal buffer, a precipitant and a surfactant are added in sequence and stirred and mixed to obtain a treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas.

[0045] In the present invention, the stirring time of the adsorbent and water is preferably 15 to 30 minutes, more preferably 18 to 25 minutes, and more preferably 20 to 22 minutes; the stirring speed is preferably 15 to 30 r / min, more preferably 18 to 25 r / min, and more preferably 20 to 22 r / min.

[0046] In the present invention, the stirring and mixing time after the metal buffer, precipitant and surfactant are added in sequence is preferably 20 to 40 minutes, more preferably 25 to 35 minutes, and more preferably 30 minutes; the stirring speed is preferably 15 to 30 r / min, more preferably 18 to 25 r / min, and more preferably 20 to 22 r / min.

[0047] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0048] Example 1

[0049] This embodiment provides a treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas, comprising the following raw materials in parts by mass:

[0050] 12 parts of adsorbent, 3.5 parts of precipitant, 0.2 parts of metal buffer, 0.25 parts of surfactant, and 24 parts of water.

[0051] The adsorbents are ethylene glycol, glycerol and isoamyl alcohol, and the usage ratio of the components is ethylene glycol:glycerol:isoamyl alcohol=2.5:1.5:3; the precipitants are aluminum sulfate, copper sulfate and zinc sulfate, and the usage ratio of the components is aluminum sulfate:copper sulfate:zinc sulfate=1.5:2:2; the metal buffers are copper chloride, cobalt chloride and magnesium chloride, and the usage ratio of the components is copper chloride:cobalt chloride:magnesium chloride=2:1.5:2; the surfactants are sodium dodecylbenzenesulfonate, sodium dodecyl sulfate and sodium α-olefin sulfonate, and the usage ratio of the components is sodium dodecylbenzenesulfonate:sodium dodecyl sulfate:sodium α-olefin sulfonate=3.5:3:2.

[0052] A method for preparing a treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas comprises the following steps:

[0053] (1) Add the adsorbent to water and stir for 20 min at a stirring rate of 20 r / min. Observe and stir until the solution is transparent and free of stratification to obtain a mixed solution.

[0054] (2) Add metal buffer, precipitant and surfactant to the above mixed solution in sequence, stirring at a rate of 20 r / min for 30 min, and observe until all the substances are dissolved uniformly to obtain the treating agent.

[0055] The prepared treatment agent is delivered to the outlet pipe of the high-temperature blower through a metering pump and sprayed into the exhaust gas through a spray gun to take effect. The temperature at the injection point of the spray gun is about 200℃.

[0056] After the treatment agent is injected, the ammonia escape concentration at the tail gas outlet can be reduced from 70ppm to 3.5ppm, meeting the national ultra-low emission policy requirements (≤10.6ppm). At the same time, the dust particle concentration at the tail gas outlet is less than 10mg / m 3 , sulfur dioxide concentration is less than 35mg / m 3 , nitrogen oxide concentration is less than 50mg / m 3 , all meet the national ultra-low emission policy requirements.

[0057] Example 2

[0058] This embodiment provides a treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas, comprising the following raw materials in parts by mass:

[0059] 13 parts of adsorbent, 3 parts of precipitant, 0.3 parts of metal buffer, 0.2 parts of surfactant, and 26 parts of water.

[0060] The adsorbents are ethylene glycol, glycerol and isoamyl alcohol, and the usage ratio of the components is ethylene glycol:glycerol:isoamyl alcohol=2:1.2:3.5; the precipitants are aluminum sulfate, copper sulfate and zinc sulfate, and the usage ratio of the components is aluminum sulfate:copper sulfate:zinc sulfate=1.3:2:2.5; the metal buffers are copper chloride, cobalt chloride and magnesium chloride, and the usage ratio of the components is copper chloride:cobalt chloride:magnesium chloride=2.5:1.5:2.5; the surfactants are sodium dodecylbenzenesulfonate, sodium dodecyl sulfate and sodium α-olefin sulfonate, and the usage ratio of the components is sodium dodecylbenzenesulfonate:sodium dodecyl sulfate:sodium α-olefin sulfonate=3:3:2.5.

[0061] The preparation method of the treatment agent for reducing the ammonia escape concentration in cement kiln tail gas is specifically described in Example 1.

[0062] After the treatment agent is injected, the ammonia escape concentration at the tail gas outlet can be reduced from 70ppm to 2.2ppm, meeting the national ultra-low emission policy requirements (≤10.6ppm). At the same time, the dust particle concentration at the tail gas outlet is less than 10mg / m 3 , sulfur dioxide concentration is less than 35mg / m 3 , nitrogen oxide concentration is less than 50mg / m 3 , all meet the national ultra-low emission policy requirements.

[0063] Comparative Example 1

[0064] This comparative example provides a treatment agent, which is specifically referred to Example 2, except that it does not contain an adsorbent component.

[0065] The preparation method of the treatment agent is specifically referred to Example 1.

[0066] After the treatment agent was injected, the ammonia escape concentration at the tail gas outlet dropped from 70ppm to 12.8ppm, which could not meet the national ultra-low emission policy requirements (≤10.6ppm). At this time, the dust particle concentration at the tail gas outlet was less than 10mg / m 3 , sulfur dioxide concentration is less than 35mg / m 3 , nitrogen oxide concentration is less than 50mg / m 3 , all meet the national ultra-low emission policy requirements.

[0067] Comparative Example 2

[0068] This comparative example provides a treating agent, which is specifically referred to Example 2, except that it does not contain a precipitant component.

[0069] The preparation method of the treatment agent is specifically referred to Example 1.

[0070] After the treatment agent was injected, the ammonia escape concentration at the tail gas outlet dropped from 70ppm to 20.4ppm, which could not meet the national ultra-low emission policy requirements (≤10.6ppm). At this time, the dust particle concentration at the tail gas outlet was less than 10mg / m 3 , sulfur dioxide concentration is less than 35mg / m 3 , nitrogen oxide concentration is less than 50mg / m 3 , all meet the national ultra-low emission policy requirements.

[0071] Comparative Example 3

[0072] This comparative example provides a treatment agent, which consists of water.

[0073] The treatment agent of the present invention is an aqueous solution product. Since ammonia is very soluble in water, this comparative example is mainly used to eliminate the influence of water on the ammonia escape effect, thereby proving the effectiveness of the ammonia removal effect of the treatment agent of the present invention.

[0074] After the treatment agent was sprayed, the ammonia escape concentration at the tail gas outlet remained unchanged at 70ppm. This indicates that only water was sprayed at the high-temperature fan outlet, which had no effect on the ammonia escape concentration in the cement kiln tail gas. This is mainly because, although ammonia is easily soluble in water, at 200°C, water will quickly vaporize, and ammonia will be separated from the water and re-enter the tail gas, so the ammonia escape concentration in the tail gas cannot be reduced. At this time, after testing, the other components in the tail gas remained basically unchanged, and the dust particle concentration at the tail gas outlet was less than 10mg / m3 , sulfur dioxide concentration is less than 35mg / m 3 , nitrogen oxide concentration is less than 50mg / m 3 , all meet the national ultra-low emission policy requirements.

[0075] Example 3

[0076] This embodiment provides a treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas, comprising the following raw materials in parts by mass:

[0077] 11 parts of adsorbent, 2.5 parts of precipitant, 0.3 parts of metal buffer, 0.18 parts of surfactant, and 26 parts of water.

[0078] The adsorbents are ethylene glycol, glycerol and isoamyl alcohol, and the usage ratio of the components is ethylene glycol:glycerol:isoamyl alcohol=2.5:1:2.5; the precipitants are aluminum sulfate and copper sulfate, and the usage ratio of the components is aluminum sulfate:copper sulfate=1:1.8; the metal buffers are copper chloride, cobalt chloride and magnesium chloride, and the usage ratio of the components is copper chloride:cobalt chloride:magnesium chloride=2:1.8:3; the surfactants are sodium dodecylbenzene sulfonate and sodium α-olefin sulfonate, and the usage ratio of the components is sodium dodecylbenzene sulfonate:sodium α-olefin sulfonate=3.5:3.

[0079] The preparation method of the treatment agent for reducing the ammonia escape concentration in cement kiln tail gas is specifically described in Example 1.

[0080] After the treatment agent is injected, the ammonia escape concentration at the tail gas outlet can be reduced from 70ppm to 6.8ppm, meeting the national ultra-low emission policy requirements (≤10.6ppm). At the same time, the dust particle concentration at the tail gas outlet is less than 10mg / m 3 , sulfur dioxide concentration is less than 35mg / m 3 , nitrogen oxide concentration is less than 50mg / m 3 , all meet the national ultra-low emission policy requirements.

[0081] Example 4

[0082] This embodiment provides a treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas, comprising the following raw materials in parts by mass:

[0083] 11 parts of adsorbent, 2.5 parts of precipitant, 0.3 parts of metal buffer, 0.18 parts of surfactant, and 26 parts of water.

[0084] The adsorbent is ethylene glycol; the precipitants are aluminum sulfate, copper sulfate and zinc sulfate, and the usage ratio of the components is aluminum sulfate: copper sulfate: zinc sulfate = 1.2:2:2.2; the metal buffers are copper chloride, cobalt chloride and magnesium chloride, and the usage ratio of the components is copper chloride: cobalt chloride: magnesium chloride = 2.5:2:3; the surfactants are sodium dodecylbenzene sulfonate, sodium dodecyl sulfate and sodium α-olefin sulfonate, and the usage ratio of the components is sodium dodecylbenzene sulfonate: sodium dodecyl sulfate: sodium α-olefin sulfonate = 3.2:2.8:2.2.

[0085] The preparation method of the treatment agent for reducing the ammonia escape concentration in cement kiln tail gas is specifically described in Example 1.

[0086] After the treatment agent is injected, the ammonia escape concentration at the tail gas outlet can be reduced from 70ppm to 5.4ppm, meeting the national ultra-low emission policy requirements (≤10.6ppm). At the same time, the dust particle concentration at the tail gas outlet is less than 10mg / m 3 , sulfur dioxide concentration is less than 35mg / m 3 , nitrogen oxide concentration is less than 50mg / m 3 , all meet the national ultra-low emission policy requirements.

[0087] In summary, the present invention provides a treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas and a preparation method thereof. The ammonia escape treatment agent of the present invention solves the problem of ammonia escape in cement kiln tail gas caused by excessive ammonia spraying in the denitrification project, avoids the risk of secondary pollution caused by ammonia emissions, and meets the national ultra-low emission limit requirements. At the same time, the ammonia escape treatment agent is non-toxic and harmless, low-cost, simple to operate on site, and requires little equipment investment, helping to empower the green development of cement enterprises.

[0088] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas, characterized in that: Contains the following raw materials in parts by weight: 10-16 parts of adsorbent, 1-5 parts of precipitant, 0.2-0.5 parts of metal buffer, 0.1-0.3 parts of surfactant, and 20-32 parts of water.

2. The treatment agent for reducing the ammonia escape concentration in cement kiln tail gas according to claim 1, characterized in that: The adsorbent comprises one or more of ethylene glycol, glycerol and isoamyl alcohol.

3. A treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas according to claim 1 or 2, characterized in that: The adsorbent comprises ethylene glycol, glycerol and isoamyl alcohol in a mass ratio of 1-3:0.5-2:2-5.

4. The treatment agent for reducing the ammonia escape concentration in cement kiln tail gas according to claim 3, characterized in that: The precipitant comprises one or more of aluminum sulfate, copper sulfate and zinc sulfate.

5. The treatment agent for reducing the ammonia escape concentration in cement kiln tail gas according to claim 4, characterized in that: The precipitant comprises aluminum sulfate, copper sulfate and zinc sulfate in a mass ratio of 0.5-2:1-3:2-3.

6. The treatment agent for reducing the ammonia escape concentration in cement kiln tail gas according to claim 5, characterized in that: The metal buffer comprises one or more of copper chloride, cobalt chloride and magnesium chloride.

7. A treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas according to claim 1 or 6, characterized in that: The metal buffer comprises copper chloride, cobalt chloride and magnesium chloride in a mass ratio of 1.5-4:1-2:2-3.

8. The treatment agent for reducing the ammonia escape concentration in cement kiln tail gas according to claim 7, characterized in that: The surfactant comprises one or more of sodium dodecylbenzenesulfonate, sodium lauryl sulfate and sodium α-olefinsulfonate.

9. The treatment agent for reducing the ammonia escape concentration in cement kiln tail gas according to claim 8, characterized in that: The surfactant comprises sodium dodecylbenzenesulfonate, sodium lauryl sulfate and sodium α-olefinsulfonate in a mass ratio of 1-5:2-4:2-3.

10. The method for preparing a treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas according to any one of claims 1 to 9, characterized in that: The following steps are involved: The adsorbent is stirred and mixed with water, and then a metal buffer, a precipitant and a surfactant are added in sequence and stirred and mixed to obtain a treatment agent for reducing the concentration of ammonia escape in cement kiln tail gas.