Preparation method of coal-saving agent for denitration type cement firing and application thereof

Abstract

The application discloses a preparation method of a coal-saving agent for denitration type cement firing and application thereof. The method comprises the following steps: (1) mixing aluminum powder, iron hydroxide powder, iron powder, magnesium powder, silica sol and polymer emulsion, stirring uniformly, drying and grinding to obtain a precursor powder; (2) placing the precursor powder in saturated limewater and reacting under heating conditions, separating out solid matters after completion, drying the solid matters, mixing the dried solid matters with phosphating liquid, standing and drying to obtain a denitration heat-aiding agent; and (3) taking a penetrating agent, a bulking agent, iron citrate and the denitration heat-aiding agent as an A component, and taking hydrogen peroxide as a B component. The A component and the B component are mixed uniformly before use to obtain the coal-saving agent. The coal-saving agent can promote the combustion of coal powder, improve the utilization rate, help to reduce the emission of polluting gases such as sulfur oxides and nitrogen oxides, and relieve the high energy consumption and high pollution problems faced by cement production enterprises.

Description

Technical Field

[0001] This invention relates to the field of coal-saving agent preparation technology, specifically to a method for preparing a denitrification type coal-saving agent for cement firing and its application. Background Technology

[0002] Cement clinker is a hydraulic cementitious material mainly obtained by high-temperature calcination of limestone, clay, and iron-based raw materials in a specific ratio. Its chemical composition primarily includes calcium oxide (CaO), silicon dioxide (SiO2), aluminum oxide (Al2O3), and iron oxide (Fe2O3). Cement clinker is a crucial basic material in modern construction engineering and a vital component of concrete. Because the preparation of cement clinker requires high temperatures, the current main method involves burning pulverized coal in a rotary kiln. Incomplete combustion of pulverized coal reduces its heat output, leading to energy waste and the production of more toxic and harmful gases. Adding coal-saving agents to pulverized coal helps promote combustion, accelerates the breaking of chemical bonds during pyrolysis, and increases the release rate of volatiles, thereby improving coal utilization and reducing energy consumption. However, the combustion of pulverized coal emits large amounts of sulfur oxides, nitrogen oxides, and other pollutants, resulting in high energy consumption and high pollution problems for cement enterprises. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a method for preparing a denitrifying coal-saving agent for cement calcination and its application. This agent promotes the combustion of pulverized coal, improves utilization, and reduces energy consumption, while also helping to reduce emissions of pollutants such as nitrogen oxides. Specifically, the technical solution of this invention is as follows.

[0004] First, this invention provides a method for preparing a denitrifying coal-saving agent for cement calcination, comprising the following steps:

[0005] (1) Aluminum powder, iron hydroxide powder, iron powder, magnesium powder, silica sol and polymer emulsion are mixed and stirred evenly, then dried and ground to obtain precursor powder.

[0006] (2) The precursor powder is placed in saturated lime water and reacted under heating conditions. After the reaction is completed, the solid is separated, dried and mixed with phosphating solution, and dried after standing to obtain denitrification heat aid.

[0007] (3) The denitrification type cement firing coal-saving agent is composed of penetrant, bulking agent, ferric citrate and the denitrification heat aid as component A, and hydrogen peroxide as component B. When using it, the components A and B are mixed into the coal powder.

[0008] Further, in step (1), the proportions of aluminum powder, iron hydroxide powder, iron powder, magnesium powder, silica sol, and polymer emulsion are 1~1.2 parts by weight: 3~3.5 parts by weight: 0.6~0.75 parts by weight: 0.8~1.1 parts by weight: 2~2.7 parts by weight: 1.25~1.4 parts by weight.

[0009] Further, in step (1), the solid content of the polymer emulsion is 30~40 wt.%. Optionally, the polymer emulsion includes any one of polyacrylate emulsion, polyvinyl acetate emulsion, polyurethane emulsion, etc.

[0010] Further, in step (1), the drying temperature is 60~80℃, and the product is dried to constant weight at this temperature.

[0011] Furthermore, in step (1), the fineness of the precursor powder is 80~120 mesh.

[0012] Further, in step (2), the solid-liquid ratio of the precursor powder to saturated lime water is 1g:20~40ml.

[0013] Furthermore, in step (2), the heating temperature is 40~50℃ and the reaction time is 7~10 hours.

[0014] Further, in step (2), the ratio of the solid to the phosphating solution is 1g:0.6~0.85ml.

[0015] Further, in step (2), the phosphating solution comprises 11-14 parts by weight of phosphoric acid, 3-5 parts by weight of zinc oxide, 155-180 parts by weight of zinc nitrate, 6-9 parts by weight of tartaric acid, 2-3 parts by weight of sodium dodecylbenzenesulfonate, 1-1.2 parts by weight of ammonium molybdate, and 980-1050 parts by weight of water.

[0016] Furthermore, in step (2), the standing time is 10~15 min, the drying temperature is 60~70℃, and the time is 25~40 min.

[0017] Further, in step (3), the ratio of the penetrant, leavening agent, ferric citrate, denitrification heat aid, and hydrogen peroxide is 35-50 parts by weight: 13-17 parts by weight: 8-13 parts by weight: 20-28 parts by weight: 63-85 parts by weight. Optionally, the mass fraction of the hydrogen peroxide is 10-20%.

[0018] Further, in step (3), the penetrant includes any one of isooctanol polyoxyethylene ether, dodecyltrimethylammonium chloride, sodium dodecyl sulfonate, alkylphenol polyoxyethylene ether, etc.

[0019] Furthermore, in step (3), the leavening agent includes at least one of sodium chloride, potassium chloride, sodium bicarbonate, sodium lignosulfonate, etc.

[0020] Finally, this invention provides the application of the denitrifying cement-burning coal-saving agent in pulverized coal. Optionally, the amount of the coal-saving agent added is 0.4~1.0% of the mass of the pulverized coal.

[0021] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects:

[0022] The penetrant in the coal-saving agent of this invention can penetrate into the pores of coal powder particles, promoting coal decomposition and chemical reactions, and improving coal powder utilization. The bulking agent bursts upon exposure to high temperatures, thereby promoting complete combustion of the coal powder. The ferric citrate helps improve the combustion capacity of the coal powder, making it burn more completely. Simultaneously, the ferric citrate is converted into iron oxide at high temperatures, which can act as a denitrification catalyst for nitrogen oxides in flue gas, reducing nitrogen oxide emissions. The hydrogen peroxide decomposes into oxygen upon heating, increasing the oxygen content and promoting complete combustion of the coal powder. The denitrification heat-aiding agent not only provides more heat energy, reducing the amount of coal powder used, but also significantly reduces nitrogen oxide emissions in flue gas. This is because the iron oxide formed by the decomposition of aluminum powder and ferric hydroxide undergoes an aluminothermic reaction under the induction of magnesium powder, releasing a large amount of heat, increasing the temperature in the cement rotary kiln, and reducing the amount of coal powder used. Simultaneously, the iron oxide and magnesium oxide formed in the reaction act as denitrification catalysts for nitrogen oxides, converting nitrogen oxides into clean nitrogen gas, reducing nitrogen oxide emissions. Furthermore, in preparing the denitrification heat aid, this invention first forms a precursor powder using aluminum powder, ferric hydroxide powder, iron powder, magnesium powder, silica sol, and polymer emulsion. Then, it is heated in saturated lime water for reaction. During this process, calcium hydroxide in the saturated lime water reacts with nano-silica in the silica sol to form hydrated calcium silicate (CSH), which coats the surface of the precursor. The phosphating solution and the iron powder on the precursor surface form a phosphating film, making the coating layer denser. On one hand, this helps protect the aluminum powder from oxidation before the aluminothermic reaction, reducing the degree of aluminothermic reaction and thus decreasing the released heat. On the other hand, the CSH can also act as a nucleating agent for dicalcium silicate and tricalcium silicate mineral phases in cement clinker, accelerating the formation of cement clinker and reducing the consumption of coal powder. After the phosphating film pulverizes at high temperature, external oxygen enters and ignites the magnesium powder, accelerating the initiation of the aluminothermic reaction. Simultaneously, since the aluminothermic reaction requires the participation of iron oxide, which mainly comes from the decomposition of ferric hydroxide at high temperature, the duration of the aluminothermic reaction is increased. Meanwhile, the alumina and iron oxide formed by the above reaction are ultimately used as raw materials to form tricalcium aluminate and tetracalcium aluminoferrite, the cementitious components in cement clinker, at high temperatures, so that the coal-saving agent of the present invention can play a full role. Attached Figure Description

[0023] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0024] Figure 1 The image shows a precursor powder sample prepared in Example 1 below.

[0025] Figure 2 The image shows a sample of the denitrification heat aid prepared in Example 1 below. Detailed Implementation

[0026] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Experimental methods in the following embodiments, unless otherwise specified, are generally performed under conventional conditions or as recommended by the manufacturer.

[0027] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as those skilled in the art. All reagents and raw materials used in this invention are readily available through conventional means, and unless otherwise specified, they shall be used in accordance with conventional methods in the art or as per the product instructions.

[0028] Furthermore, any methods and materials similar to or equivalent to those described herein can be applied to the method of this invention. The preferred embodiments and materials described in this invention are for illustrative purposes only. The technical solution of this invention will now be further described in conjunction with specific embodiments.

[0029] Example 1

[0030] A method for preparing a denitrification-type coal-saving agent for cement firing includes the following steps:

[0031] (1) Aluminum powder, ferric hydroxide powder, iron powder, magnesium powder, silica sol, and polyacrylate emulsion with a solid content of 35 wt.% were mixed in a ratio of 1.2 parts by weight: 3.4 parts by weight: 0.7 parts by weight: 0.95 parts by weight: 2.5 parts by weight: 1.3 parts by weight and stirred until homogeneous. The fineness of each powder was 200 mesh. The resulting mixture was then dried at 80°C to constant weight, then ground and passed through a 100-mesh sieve to obtain the precursor powder (e.g. Figure 1 (As shown), for later use.

[0032] (2) The precursor powder and saturated lime water are mixed at a ratio of 1g:20ml and stirred evenly. Then, the mixture is heated in a water bath to 45℃ and kept at that temperature for 8 hours. After completion, the solid is filtered out, dried, and then mixed with phosphating solution (containing the following components in 1000g of water: 12g phosphoric acid, 4g zinc oxide, 170g zinc nitrate, 6.5g tartaric acid, 3g sodium dodecylbenzenesulfonate, and 1.1g ammonium molybdate) at a ratio of 1g:0.75ml and stirred evenly. After standing for 10 minutes, the mixture is heated to 60℃ and dried for 30 minutes to obtain the denitrification heat aid (e.g., Figure 2 (As shown).

[0033] (3) Weigh the following components according to the following proportions: 46 parts by weight of isooctanol polyoxyethylene ether, 15 parts by weight of sodium chloride, 10 parts by weight of ferric citrate, 24 parts by weight of the denitrification heat aid described in this embodiment, and 73 parts by weight of hydrogen peroxide with a mass fraction of 20%. Mix the components before the hydrogen peroxide evenly as component A, and the hydrogen peroxide as component B. The two constitute the denitrification type coal-saving agent for cement firing.

[0034] The coal-saving agent of this embodiment was mixed evenly into pulverized coal at a dosage of 0.8% of its mass. The coal-saving rate and nitrogen oxide emissions of the pulverized coal were then tested, and the nitrogen oxide emission reduction rate was calculated. The coal-saving rate was calculated as follows: Coal-saving rate = (AB) / B, where A is the steam production per ton of standard coal with the coal-saving agent added, and B is the steam production per ton of standard coal for the control group. The emission reduction rate was calculated as follows: Coal-saving rate = 18.22%, Emission reduction rate = 74.09%.

[0035] Example 2

[0036] A method for preparing a denitrification-type coal-saving agent for cement firing includes the following steps:

[0037] (1) Aluminum powder, ferric hydroxide powder, iron powder, magnesium powder, silica sol, and polyvinyl acetate emulsion with a solid content of 40 wt.% were mixed in a ratio of 1.0 parts by weight: 3.0 parts by weight: 0.6 parts by weight: 0.8 parts by weight: 2.0 parts by weight: 1.25 parts by weight and stirred evenly. The fineness of each powder was 200 mesh. The mixture was then dried at 75°C to constant weight, then ground and passed through a 120-mesh sieve to obtain the precursor powder for later use.

[0038] (2) Mix the precursor powder with saturated lime water at a ratio of 1g:35ml and stir evenly. Then heat it in a water bath to 50℃ and keep it warm for 7 hours. After completion, filter out the solid matter, dry it, and mix it with phosphating solution (each 980g of water contains the following components in the following proportion: 11g of phosphoric acid, 3g of zinc oxide, 155g of zinc nitrate, 6g of tartaric acid, 2g of sodium dodecylbenzenesulfonate, and 1.0g of ammonium molybdate) at a ratio of 1g:0.85ml and stir evenly. Then let it stand for 12 minutes. After completion, heat it to 70℃ and dry it for 40 minutes to obtain the denitrification heat aid.

[0039] (3) Weigh the following components according to the following proportions: 35 parts by weight of dodecyltrimethylammonium chloride, 13 parts by weight of potassium chloride, 8 parts by weight of ferric citrate, 20 parts by weight of the denitrification heat aid described in this embodiment, and 63 parts by weight of hydrogen peroxide with a mass fraction of 18%. Mix the components before the hydrogen peroxide evenly as component A, and the hydrogen peroxide as component B. The two constitute the denitrification type coal-saving agent for cement firing.

[0040] The denitrification-type cement calcination coal-saving agent of this embodiment was mixed evenly with pulverized coal at a dosage of 1.0% of its mass. Then, the coal-saving rate and nitrogen oxide emissions of the pulverized coal were tested, and the nitrogen oxide emission reduction rate was calculated (using the same method as in Example 1 above). The results are as follows: coal-saving rate = 21.36%, emission reduction rate = 69.14%.

[0041] Example 3

[0042] A method for preparing a denitrification-type coal-saving agent for cement firing includes the following steps:

[0043] (1) Aluminum powder, ferric hydroxide powder, iron powder, magnesium powder, silica sol, and polyurethane emulsion with a solid content of 30 wt.% were mixed in a ratio of 1.15 parts by weight: 3.5 parts by weight: 0.75 parts by weight: 1.1 parts by weight: 2.7 parts by weight: 1.4 parts by weight and stirred until homogeneous. The fineness of each powder was 200 mesh. The mixture was then dried at 60°C to constant weight, then ground and passed through an 80-mesh sieve to obtain precursor powder for later use.

[0044] (2) The precursor powder and saturated lime water are mixed at a ratio of 1g:40ml and stirred evenly. Then, the mixture is heated to 40℃ in a water bath and kept warm for 10 hours. After completion, the solid is filtered out and dried. Then, it is mixed with phosphating solution (each 1050g of water contains the following components in the following proportions: 14g of phosphoric acid, 5g of zinc oxide, 180g of zinc nitrate, 9g of tartaric acid, 2.8g of sodium dodecylbenzenesulfonate, and 1.2g of ammonium molybdate) at a ratio of 1g:0.6ml and stirred evenly. Then, it is allowed to stand for 15 minutes. After completion, it is heated to 70℃ and dried for 25 minutes to obtain the denitrification heat aid.

[0045] (3) Weigh the following components according to the following proportions: 50 parts by weight of sodium dodecyl sulfonate, 17 parts by weight of sodium lignosulfonate, 13 parts by weight of ferric citrate, 28 parts by weight of the denitrification heat aid described in this embodiment, and 85 parts by weight of hydrogen peroxide with a mass fraction of 10%. Mix the components before the hydrogen peroxide evenly as component A, and the hydrogen peroxide as component B. The two constitute the denitrification type coal-saving agent for cement firing.

[0046] The denitrification-type cement calcination coal-saving agent of this embodiment was mixed evenly with pulverized coal at a dosage of 0.4% of its mass. Then, the coal-saving rate and nitrogen oxide emissions of the pulverized coal were tested, and the nitrogen oxide emission reduction rate was calculated (using the same method as in Example 1 above). The results are as follows: coal-saving rate = 17.52%, emission reduction rate = 65.73%.

[0047] Example 4

[0048] A method for preparing a denitrification-type coal-saving agent for cement firing includes the following steps:

[0049] (1) Aluminum powder, ferric hydroxide powder, iron powder, magnesium powder, silica sol, and polyvinyl acetate emulsion with a solid content of 40 wt.% were mixed in a ratio of 1.0 parts by weight: 3.0 parts by weight: 0.6 parts by weight: 0.8 parts by weight: 2.0 parts by weight: 1.25 parts by weight and stirred evenly. The fineness of each powder was 200 mesh. The mixture was then dried at 75°C to constant weight, and then ground and passed through a 120-mesh sieve to obtain the denitrification heat aid.

[0050] (2) Weigh the following components according to the following proportions: 35 parts by weight of dodecyltrimethylammonium chloride, 13 parts by weight of potassium chloride, 8 parts by weight of ferric citrate, 20 parts by weight of the denitrification heat aid described in this embodiment, and 63 parts by weight of hydrogen peroxide with a mass fraction of 18%. Mix the components before the hydrogen peroxide evenly as component A, and the hydrogen peroxide as component B. The two constitute the denitrification type coal-saving agent for cement firing.

[0051] The denitrification-type cement calcination coal-saving agent of this embodiment was mixed evenly with pulverized coal at a dosage of 1.0% of its mass. Then, the coal-saving rate and nitrogen oxide emissions of the pulverized coal were tested, and the nitrogen oxide emission reduction rate was calculated (using the same method as in Example 1 above). The results are as follows: coal-saving rate = 16.88%, emission reduction rate = 66.23%.

[0052] Example 5

[0053] A method for preparing a denitrification-type coal-saving agent for cement firing includes the following steps:

[0054] (1) Aluminum powder, ferric hydroxide powder, iron powder, magnesium powder, silica sol, and polyacrylate emulsion with a solid content of 35 wt.% were mixed in a ratio of 1.2 parts by weight: 3.4 parts by weight: 0.7 parts by weight: 0.95 parts by weight: 2.5 parts by weight: 1.3 parts by weight and stirred evenly. The fineness of each powder was 200 mesh. The mixture was then dried at 80°C to constant weight, then ground and passed through a 100-mesh sieve to obtain the precursor powder for later use.

[0055] (2) The precursor powder and saturated lime water are mixed at a ratio of 1g:20ml and stirred evenly. Then, the mixture is heated in a water bath to 45°C and kept at that temperature for 8 hours. After the process is completed, the solid is filtered out and dried at 60°C to constant weight to obtain the denitrification heat aid.

[0056] (3) Weigh the following components according to the following proportions: 46 parts by weight of isooctanol polyoxyethylene ether, 15 parts by weight of sodium chloride, 10 parts by weight of ferric citrate, 24 parts by weight of a 20% denitrification heat aid, and 73 parts by weight of hydrogen peroxide. Mix the components before the hydrogen peroxide evenly as component A, and the hydrogen peroxide as component B. The two constitute the denitrification-type cement firing coal-saving agent.

[0057] The denitrification-type cement calcination coal-saving agent of this embodiment was mixed evenly with pulverized coal at a dosage of 0.8% of its mass. Then, the coal-saving rate and nitrogen oxide emissions of the pulverized coal were tested, and the nitrogen oxide emission reduction rate was calculated (using the same method as in Example 1 above). The results are as follows: coal-saving rate = 15.67%, emission reduction rate = 72.18%.

[0058] Example 6

[0059] A method for preparing a denitrifying cement calcination coal-saving agent differs from Example 3 above in that the precursor powder in this example is prepared using the following method: aluminum powder, iron oxide powder, iron powder, magnesium powder, silica sol, and a polyurethane emulsion with a solid content of 30 wt.% are mixed and stirred evenly in a ratio of 1.15 parts by weight: 3.5 parts by weight: 0.75 parts by weight: 1.1 parts by weight: 2.7 parts by weight: 1.4 parts by weight, wherein the fineness of each powder is 200 mesh. The resulting mixture is then dried at 60°C to constant weight, then ground and passed through an 80-mesh sieve to obtain the precursor powder.

[0060] The denitrification-type cement calcination coal-saving agent of this embodiment was mixed evenly with pulverized coal at a dosage of 0.4% of its mass. Then, the coal-saving rate and nitrogen oxide emissions of the pulverized coal were tested, and the nitrogen oxide emission reduction rate was calculated (using the same method as in Example 1 above). The results are as follows: coal-saving rate = 13.36%, emission reduction rate = 61.45%.

[0061] Example 7

[0062] A method for preparing a denitrification-type coal-saving agent for cement firing includes the following steps:

[0063] The components are weighed according to the following proportions: 46 parts by weight of isooctanol polyoxyethylene ether, 15 parts by weight of sodium chloride, 10 parts by weight of ferric citrate, 24 parts by weight of the denitrification heat aid described in this embodiment, and 73 parts by weight of water. The components before the water are mixed evenly as component A, and the water is component B. The two constitute the denitrification-type coal-saving agent for cement firing.

[0064] The denitrification-type cement calcination coal-saving agent of this embodiment was mixed evenly with pulverized coal at a dosage of 0.8% of its mass. Then, the coal-saving rate and nitrogen oxide emissions of the pulverized coal were tested, and the nitrogen oxide emission reduction rate was calculated (using the same method as in Example 1 above). The results are as follows: coal-saving rate = 16.48%, emission reduction rate = 70.25%.

[0065] Example 8

[0066] A method for preparing a denitrifying cement calcination coal-saving agent differs from Example 3 above in that the precursor powder in this example is prepared using the following method: aluminum powder, ferric hydroxide powder, iron powder, magnesium powder, and a polyurethane emulsion with a solid content of 30 wt.% are mixed in a ratio of 1.15 parts by weight: 3.5 parts by weight: 0.75 parts by weight: 1.1 parts by weight: 1.4 parts by weight, and stirred evenly. The fineness of each powder is 200 mesh. The resulting mixture is then dried at 60°C to constant weight, then ground and passed through an 80-mesh sieve to obtain the precursor powder.

[0067] The denitrification-type cement calcination coal-saving agent of this embodiment was mixed evenly with pulverized coal at a dosage of 0.4% of its mass. Then, the coal-saving rate and nitrogen oxide emissions of the pulverized coal were tested, and the nitrogen oxide emission reduction rate was calculated (using the same method as in Example 1 above). The results are as follows: coal-saving rate = 13.94%, emission reduction rate = 63.01%.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a denitrification-type coal-saving agent for cement firing, characterized in that, Includes the following steps: (1) Aluminum powder, iron hydroxide powder, iron powder, magnesium powder, silica sol and polymer emulsion are mixed and stirred evenly, then dried and ground to obtain precursor powder; (2) The precursor powder is placed in saturated lime water and reacted under heating conditions of 40~50℃. After the reaction is completed, the solid is separated, dried and mixed with phosphating solution, allowed to stand and then dried to obtain denitrification heat aid; the standing time is 10~15min, the drying temperature is 60~70℃ and the drying time is 25~40min. (3) The denitrification type cement firing coal-saving agent is composed of penetrant, bulking agent, ferric citrate and the denitrification heat aid as component A and hydrogen peroxide as component B.

2. The method for preparing the denitrification type coal-saving agent for cement firing according to claim 1, characterized in that, In step (1), the proportions of aluminum powder, iron hydroxide powder, iron powder, magnesium powder, silica sol, and polymer emulsion are 1~1.2 parts by weight: 3~3.5 parts by weight: 0.6~0.75 parts by weight: 0.8~1.1 parts by weight: 2~2.7 parts by weight: 1.25~1.4 parts by weight.

3. The method for preparing the denitrification type coal-saving agent for cement firing according to claim 1, characterized in that, In step (1), the solid content of the polymer emulsion is 30~40 wt.%.

4. The preparation method of the denitrification type coal-saving agent for cement firing according to claim 1, characterized in that, In step (1), the polymer emulsion includes any one of polyacrylate emulsion, polyvinyl acetate emulsion, and polyurethane emulsion.

5. The method for preparing the denitrification type coal-saving agent for cement firing according to claim 1, characterized in that, In step (2), the solid-liquid ratio of the precursor powder to saturated lime water is 1g:20~40ml.

6. The method for preparing the denitrification-type coal-saving agent for cement calcination according to claim 1, characterized in that, In step (1), the drying temperature is 60~80℃, and the product is dried to constant weight at this temperature.

7. The method for preparing the denitrification type coal-saving agent for cement firing according to claim 1, characterized in that, In step (1), the precursor powder has a fineness of 80~120 mesh.

8. The method for preparing the denitrification type coal-saving agent for cement firing according to claim 1, characterized in that, In step (2), the reaction time is 7 to 10 hours.

9. The method for preparing the denitrification type coal-saving agent for cement firing according to claim 1, characterized in that, In step (2), the ratio of the solid to the phosphating solution is 1g:0.6~0.85ml.

10. The method for preparing the denitrifying cement calcination coal-saving agent according to claim 1, characterized in that, In step (2), the phosphating solution comprises 11-14 parts by weight of phosphoric acid, 3-5 parts by weight of zinc oxide, 155-180 parts by weight of zinc nitrate, 6-9 parts by weight of tartaric acid, 2-3 parts by weight of sodium dodecylbenzenesulfonate, 1-1.2 parts by weight of ammonium molybdate, and 980-1050 parts by weight of water.

11. The method for preparing the denitrification-type coal-saving agent for cement firing according to claim 1, characterized in that, In step (3), the ratio of the penetrant, leavening agent, ferric citrate, denitrification heat aid and hydrogen peroxide is 35~50 parts by weight: 13~17 parts by weight: 8~13 parts by weight: 20~28 parts by weight: 63~85 parts by weight.

12. The method for preparing the denitrification type coal-saving agent for cement firing according to claim 1, characterized in that, In step (3), the mass fraction of the hydrogen peroxide is 10-20%.

13. The method for preparing the denitrification-type coal-saving agent for cement firing according to any one of claims 1-8, characterized in that, In step (3), the penetrant includes any one of isooctanol polyoxyethylene ether, dodecyltrimethylammonium chloride, sodium dodecyl sulfonate, and alkylphenol polyoxyethylene ether.

14. The method for preparing the denitrification type coal-saving agent for cement firing according to claim 1, characterized in that, In step (3), the leavening agent includes at least one of sodium chloride, potassium chloride, sodium bicarbonate, and sodium lignosulfonate.

15. The application of the denitrifying cement-burning coal-saving agent obtained by the preparation method according to any one of claims 1-14 in pulverized coal.

16. The application according to claim 15, characterized in that, The amount of the coal-saving agent added is 0.4 to 1.0% of the coal powder mass.

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