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

Abstract

The invention discloses a preparation method and application of a denitration type cement firing coal-saving agent. The method comprises the following steps: (1) mixing aluminum powder, ferric hydroxide powder, iron powder, magnesium powder, silica sol and polymer emulsion, uniformly stirring, drying, and grinding to obtain precursor powder; and (2) putting the precursor powder into saturated lime water, reacting under a heating condition, separating out a solid after reaction is completed, drying the solid, uniformly mixing the solid with a phosphating solution, standing, and drying to obtain the denitration heating aid. And (3) taking a penetrant, a bulking agent, ferric citrate and the denitration heating aid as a component A, and taking hydrogen peroxide as a component B. Before use, the component A and the component B are uniformly mixed to obtain the coal saving agent. The coal-saving agent promotes combustion of pulverized coal, improves the utilization rate, is also beneficial to reduction of emission of pollution gases such as sulfur oxides and nitrogen oxides, and alleviates the problems of high energy consumption and high pollution faced by cement production enterprises.

Description

Technical Field

[0001] The invention relates to the technical field of coal-saving agent preparation, and in particular to a preparation method and application of a denitrification type cement-burning coal-saving agent. Background Art

[0002] Cement clinker is a hydraulic cementitious material obtained by mixing limestone, clay and iron raw materials in proportion and calcining them at high temperature. Its chemical components mainly include calcium oxide (CaO), silicon dioxide (SiO 2 )、Alumina(Al 2 O 3 ) and iron oxide (Fe 2 O 3 ) etc. Cement clinker is a very important basic material for modern construction projects and is also one of the important components of concrete. ‌Since the preparation of cement clinker needs to be carried out at high temperature, the main method currently used is to burn the injected coal powder in a rotary kiln at a high temperature. If the coal powder is not burned fully during the combustion process, the heat generated will be reduced, which will not only cause energy waste, but also produce more toxic and harmful gases. Adding coal-saving agents to coal powder can help promote the combustion rate, accelerate the breaking of chemical bonds of coal powder during pyrolysis, and increase the precipitation rate of volatiles, thereby improving the utilization rate of coal powder and reducing energy consumption. However, coal powder will emit a large amount of pollutants such as sulfur oxides and nitrogen oxides during the combustion process, resulting in cement companies facing problems of high energy consumption and high pollution. Summary of the invention

[0003] In view of the above problems, the present invention provides a preparation method and application of a denitrification type cement burning coal saving agent, which not only promotes the combustion of coal powder, improves the utilization rate, and reduces energy consumption, but also helps to reduce the emission of polluting gases such as nitrogen oxides. Specifically, the technical solution of the present invention is as follows.

[0004] First, the present invention provides a method for preparing a denitrification type cement burning coal saving agent, comprising the following steps: (1) Aluminum powder, ferric hydroxide powder, iron powder, magnesium powder, silica sol, and polymer emulsion are mixed and stirred evenly, and then dried and ground to obtain a precursor powder.

[0005] (2) placing the precursor powder in saturated lime water to react under heating conditions, separating the solid matter after completion, drying it and mixing it with the phosphating solution, letting it stand and then drying it to obtain a denitrification thermal aid.

[0006] (3) The denitrification type cement burning coal saving agent is composed of a penetrant, a bulking agent, ferric citrate and the denitrification heat-aiding agent as component A and hydrogen peroxide as component B. When used, the component A and the component B are mixed into coal powder.

[0007] Furthermore, in step (1), the ratio of the aluminum powder, ferric hydroxide powder, iron powder, magnesium powder, silica sol, and polymer emulsion is 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.

[0008] Furthermore, 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.

[0009] Furthermore, in step (1), the drying temperature is 60-80° C., and the mixture is dried to a constant weight at this temperature.

[0010] Furthermore, in step (1), the fineness of the precursor powder is 80-120 mesh.

[0011] Furthermore, in step (2), the solid-liquid ratio of the precursor powder to saturated lime water is 1 g: 20-40 ml.

[0012] Furthermore, in step (2), the heating temperature is 40-50° C., and the reaction time is 7-10 hours.

[0013] Furthermore, in step (2), the ratio of the solid matter to the phosphating liquid is 1 g: 0.6-0.85 ml.

[0014] Furthermore, 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 dodecylbenzene sulfonate, 1-1.2 parts by weight of ammonium molybdate, and 980-1050 parts by weight of water.

[0015] Furthermore, in step (2), the standing time is 10-15 minutes, the drying temperature is 60-70°C, and the time is 25-40 minutes.

[0016] Furthermore, in step (3), the ratio of the penetrant, the leavening agent, the ferric citrate, the denitrification heat-aiding agent, and the 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%.

[0017] Furthermore, in step (3), the penetrant includes any one of polyoxyethylene isooctyl alcohol ether, dodecyl trimethyl ammonium chloride, sodium dodecyl sulfonate, alkylphenol polyoxyethylene ether, etc.

[0018] Furthermore, in step (3), the leavening agent includes at least one of sodium chloride, potassium chloride, sodium bicarbonate, sodium lignin sulfonate, etc.

[0019] Finally, the present invention provides the use of the denitrification cement burning coal saving agent in coal powder. Optionally, the addition amount of the coal saving agent is 0.4-1.0% of the mass of the coal powder.

[0020] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects: The penetrant in the coal-saving agent of the present invention can penetrate into the interior of the coal powder particles through the pores of the coal powder particles, promote the decomposition and chemical reaction of the coal, and improve the utilization rate of the coal powder. The leavening agent will explode after being subjected to high temperature, thereby promoting the full combustion of the coal powder. The ferric citrate helps to improve the combustion ability of the coal powder and make it burn more fully. At the same time, the ferric citrate is converted into iron oxide after being subjected to high temperature, which can be used as a denitration catalyst for nitrogen oxides in flue gas to reduce the emission of nitrogen oxides. The hydrogen peroxide decomposes oxygen after being heated to increase the oxygen content and promote the full combustion of coal powder. The denitration thermal aid can not only provide more heat energy and reduce the use of coal powder, but also significantly reduce the emission of nitrogen oxides in flue gas. This is because: the iron oxide formed by the decomposition of the aluminum powder and the iron hydroxide undergoes an aluminothermic reaction under the induction of the magnesium powder, thereby releasing a large amount of heat, increasing the temperature in the cement rotary kiln, and reducing the use of coal powder. At the same time, the iron oxide and magnesium oxide formed by the reaction act as denitration catalysts for nitrogen oxides, which can convert nitrogen oxides into clean nitrogen and reduce the emission of nitrogen oxides. In addition, when preparing the denitrification thermal aid, the present invention first forms a precursor powder with aluminum powder, iron hydroxide powder, iron powder, magnesium powder, silica sol, and polymer emulsion. Then, the precursor powder is heated in saturated lime water for reaction. During this process, the calcium hydroxide in the saturated lime water reacts with the nano-silicon dioxide in the silica sol to form calcium silicate hydrate (CSH) coated on the surface of the precursor. The phosphating film formed by the phosphating solution and the iron powder on the surface of the precursor makes the coating layer more compact. On the one hand, it helps to protect the aluminum powder from being oxidized before the thermite reaction, resulting in a decrease in the degree of thermite and a decrease in the amount of heat released. On the other hand, the CSH can also be used as a nucleating agent for the mineral phases of dicalcium silicate and tricalcium silicate in cement clinker, accelerating the formation of cement clinker and reducing the consumption of coal powder. After the phosphating film is pulverized at high temperature, the external oxygen enters to ignite the magnesium powder, accelerating the start of the thermite reaction. At the same time, since the thermite reaction requires the participation of iron oxide, which mainly comes from the decomposition of the iron hydroxide at high temperature, the duration of the thermite reaction is increased. At the same time, the aluminum oxide and iron oxide formed by the above reaction are finally used as raw materials to form the gelling components tricalcium aluminate and tetracalcium aluminoferrite in cement clinker at high temperature, so that the coal-saving agent of the present invention can fully play its role. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] Figure 1 This is a picture of the precursor powder sample prepared in the following Example 1.

[0023] Figure 2 This is a sample diagram of the denitrification thermal aid prepared in the following Example 1. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with specific examples. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples without specifying specific conditions are usually carried out under conventional conditions or under conditions recommended by the manufacturer.

[0025] Unless otherwise defined, all professional and scientific terms used in the present invention have the same meanings as those familiar to those skilled in the art. The reagents or raw materials used in the present invention can be purchased through conventional channels. Unless otherwise specified, the reagents or raw materials used in the present invention are used in a conventional manner in the art or in accordance with the product instructions.

[0026] In addition, any method and material similar or equivalent to the described content can be applied to the method of the present invention. The preferred implementation methods and materials described in the present invention are only for demonstration purposes. The technical solution of the present invention is now further described in conjunction with specific implementation methods.

[0027] Example 1 A method for preparing a denitrification type cement burning coal saving agent comprises the following steps: (1) Aluminum powder, iron 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, wherein the fineness of each powder was 200 mesh. The obtained mixture was then dried at 80°C to constant weight, and then ground and sieved through a 100 mesh sieve to obtain a precursor powder (such as Figure 1 as shown), for standby use.

[0028] (2) The precursor powder is mixed with saturated lime water at a ratio of 1 g:20 ml and stirred evenly, and then heated in a water bath to 45°C for 8 hours. After completion, the solid is filtered out, dried, and mixed with phosphating solution (containing the following components per 1000 g of water: 12 g phosphoric acid, 4 g zinc oxide, 170 g zinc nitrate, 6.5 g tartaric acid, 3 g sodium dodecylbenzene sulfonate, 1.1 g ammonium molybdate) at a ratio of 1 g:0.75 ml and stirred evenly, and then allowed to stand for 10 minutes. After completion, it is heated to 60°C and dried for 30 minutes to obtain a denitrification thermal aid (such as Figure 2 as shown).

[0029] (3) Weigh the following components in the following proportions: 46 parts by weight of isooctyl alcohol polyoxyethylene ether, 15 parts by weight of sodium chloride, 10 parts by weight of ferric citrate, 24 parts by weight of the denitration thermal aid of this embodiment, and 73 parts by weight of 20% hydrogen peroxide. Mix the components before the hydrogen peroxide evenly as component A, and use the hydrogen peroxide as component B. The two components constitute the denitration type cement burning coal saving agent.

[0030] The coal-saving agent of this embodiment is mixed into the coal powder and mixed evenly, and the mixing amount is 0.8% of its mass. Then the coal-saving rate and nitrogen oxide emission of the coal powder are tested, and the nitrogen oxide emission reduction rate is calculated, where: coal-saving rate = (AB) / B, A is the steam production per ton of standard coal added with the coal-saving agent, and B is the steam production per ton of standard coal of the blank group. The emission reduction rate = (M 2 -M 1 ) / M 2 , the M 2 is the mass of nitrogen oxides emitted by the blank group, M 1 is the mass of nitrogen oxides emitted when using the coal-saving agent. The results are as follows: coal-saving rate = 18.22%, emission reduction rate = 74.09%.

[0031] Example 2 A method for preparing a denitrification type cement burning coal saving agent comprises the following steps: (1) Aluminum powder, iron 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 weight part: 3.0 weight part: 0.6 weight part: 0.8 weight part: 2.0 weight part: 1.25 weight part, and stirred evenly, wherein the fineness of each powder was 200 mesh. The obtained mixture was then dried at 75°C to constant weight, and then ground and sieved through a 120-mesh sieve to obtain a precursor powder for later use.

[0032] (2) The precursor powder is mixed with saturated lime water at a ratio of 1g:35ml and stirred evenly, and then heated in a water bath to 50°C and kept warm for 7 hours. After completion, the solid is filtered out, dried and mixed with phosphating solution (containing the following components in every 980g of water: 11g phosphoric acid, 3g zinc oxide, 155g zinc nitrate, 6g tartaric acid, 2g sodium dodecylbenzene sulfonate, 1.0g ammonium molybdate) at a ratio of 1g:0.85ml and stirred evenly, and then allowed to stand for 12 minutes. After completion, it is heated to 70°C and dried for 40 minutes to obtain a denitrification thermal aid.

[0033] (3) Weigh the following components in the following proportions: 35 parts by weight of dodecyl trimethyl ammonium chloride, 13 parts by weight of potassium chloride, 8 parts by weight of ferric citrate, 20 parts by weight of the denitration thermal aid of 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 use the hydrogen peroxide as component B. The two components constitute the denitration type cement burning coal saving agent.

[0034] The denitrification cement burning coal saving agent of this embodiment is mixed into the coal powder and mixed evenly, and the mixing amount is 1.0% of its mass. Then the coal saving rate and nitrogen oxide emission of the coal powder are tested, and the nitrogen oxide emission reduction rate is calculated (the method is the same as that of the above embodiment 1), and the results are as follows: coal saving rate = 21.36%, emission reduction rate = 69.14%.

[0035] Example 3 A method for preparing a denitrification type cement burning coal saving agent comprises the following steps: (1) Aluminum powder, iron 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 evenly, wherein the fineness of each powder was 200 mesh. The obtained mixture was then dried at 60°C to constant weight, and then ground and sieved through an 80-mesh sieve to obtain a precursor powder for later use.

[0036] (2) The precursor powder is mixed with saturated lime water at a ratio of 1 g:40 ml and stirred evenly, and then heated in a water bath to 40°C and kept warm for 10 hours. After completion, the solid is filtered out, dried, and mixed with phosphating solution (containing the following components in every 1050 g of water: 14 g phosphoric acid, 5 g zinc oxide, 180 g zinc nitrate, 9 g tartaric acid, 2.8 g sodium dodecylbenzene sulfonate, 1.2 g ammonium molybdate) at a ratio of 1 g:0.6 ml and stirred evenly, and then allowed to stand for 15 minutes. After completion, it is heated to 70°C and dried for 25 minutes to obtain a denitrification thermal aid.

[0037] (3) Weigh the following components in the following proportions: 50 parts by weight of sodium dodecyl sulfate, 17 parts by weight of sodium lignin sulfonate, 13 parts by weight of ferric citrate, 28 parts by weight of the denitrification thermal aid of this embodiment, and 85 parts by weight of 10% hydrogen peroxide. Mix the components before the hydrogen peroxide evenly as component A, and use the hydrogen peroxide as component B. The two components constitute the denitrification type cement burning coal saving agent.

[0038] The denitrification cement burning coal saving agent of this embodiment is mixed into the coal powder and mixed evenly, and the mixing amount is 0.4% of its mass. Then the coal saving rate and nitrogen oxide emission of the coal powder are tested, and the nitrogen oxide emission reduction rate is calculated (the method is the same as that of the above embodiment 1), and the results are as follows: coal saving rate = 17.52%, emission reduction rate = 65.73%.

[0039] Example 4 A method for preparing a denitrification type cement burning coal saving agent comprises the following steps: (1) Aluminum powder, iron hydroxide powder, iron powder, magnesium powder, silica sol, and polyvinyl acetate emulsion with a solid content of 40 wt.% are mixed in a ratio of 1.0 weight part: 3.0 weight part: 0.6 weight part: 0.8 weight part: 2.0 weight part: 1.25 weight part, and stirred evenly, wherein the fineness of each powder is 200 mesh. The obtained mixture is then dried at 75°C to constant weight, and then ground and sieved through a 120-mesh sieve to obtain a denitrification thermal aid.

[0040] (2) Weigh the following components in the following proportions: 35 parts by weight of dodecyl trimethyl ammonium chloride, 13 parts by weight of potassium chloride, 8 parts by weight of ferric citrate, 20 parts by weight of the denitration thermal aid of 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 use the hydrogen peroxide as component B. The two components constitute the denitration type cement burning coal saving agent.

[0041] The denitrification cement burning coal saving agent of this embodiment is mixed into the coal powder and mixed evenly, and the mixing amount is 1.0% of its mass. Then the coal saving rate and nitrogen oxide emission of the coal powder are tested, and the nitrogen oxide emission reduction rate is calculated (the method is the same as that of the above embodiment 1), and the results are as follows: coal saving rate = 16.88%, emission reduction rate = 66.23%.

[0042] Example 5 A method for preparing a denitrification type cement burning coal saving agent comprises the following steps: (1) Aluminum powder, iron hydroxide powder, iron powder, magnesium powder, silica sol, and polyacrylate emulsion with a solid content of 35 wt.% are 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, wherein the fineness of each powder is 200 mesh. The obtained mixture is then dried at 80°C to constant weight, and then ground and sieved through a 100-mesh sieve to obtain a precursor powder for later use.

[0043] (2) The precursor powder is mixed with saturated lime water at a ratio of 1 g:20 ml and stirred evenly, and then heated in a water bath to 45° C. and kept warm for 8 hours. After completion, the solid matter is filtered out and dried at 60° C. to constant weight to obtain a denitrification thermal aid.

[0044] (3) Weigh the following components in the following proportions: 46 parts by weight of isooctyl alcohol polyoxyethylene ether, 15 parts by weight of sodium chloride, 10 parts by weight of ferric citrate, 24 parts by weight of a 20% denitration thermal aid, and 73 parts by weight of hydrogen peroxide. Mix the components before the hydrogen peroxide evenly as component A, and use the hydrogen peroxide as component B. The two components constitute the denitration type cement burning coal saving agent.

[0045] The denitrification cement burning coal saving agent of this embodiment is mixed into the coal powder evenly, and the mixing amount is 0.8% of its mass. Then the coal saving rate and nitrogen oxide emission of the coal powder are tested, and the nitrogen oxide emission reduction rate is calculated (the method is the same as that of the above embodiment 1), and the results are as follows: coal saving rate = 15.67%, emission reduction rate = 72.18%.

[0046] Example 6 A method for preparing a denitrification cement burning coal saving agent, which is different from the above-mentioned embodiment 3 in that the precursor powder of this embodiment is prepared by the following method: aluminum powder, iron oxide powder, iron powder, magnesium powder, silica sol, polyurethane emulsion with a solid content of 30wt.% 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: 2.7 parts by weight: 1.4 parts by weight and stirred evenly, wherein the fineness of each powder is 200 mesh. Then the obtained mixture is dried at 60°C to constant weight, and then ground and sieved through an 80-mesh sieve to obtain a precursor powder.

[0047] The denitrification cement burning coal saving agent of this embodiment is mixed into the coal powder and mixed evenly, and the mixing amount is 0.4% of its mass. Then the coal saving rate and nitrogen oxide emission of the coal powder are tested, and the nitrogen oxide emission reduction rate is calculated (the method is the same as that of the above embodiment 1), and the results are as follows: coal saving rate = 13.36%, emission reduction rate = 61.45%.

[0048] Example 7 A method for preparing a denitrification type cement burning coal saving agent comprises the following steps: Weigh the components according to the following proportions: 46 parts by weight of isooctyl alcohol polyoxyethylene ether, 15 parts by weight of sodium chloride, 10 parts by weight of ferric citrate, 24 parts by weight of the denitration thermal aid of this embodiment, and 73 parts by weight of clean water. Mix the components before the clean water evenly as component A, and use the clean water as component B. The two components constitute the denitration type cement burning coal saving agent.

[0049] The denitrification cement burning coal saving agent of this embodiment is mixed into the coal powder and mixed evenly, and the mixing amount is 0.8% of its mass. Then the coal saving rate and nitrogen oxide emission of the coal powder are tested, and the nitrogen oxide emission reduction rate is calculated (the method is the same as that of the above embodiment 1), and the results are as follows: coal saving rate = 16.48%, emission reduction rate = 70.25%.

[0050] Example 8 A method for preparing a denitrification cement burning coal saving agent, which is different from the above-mentioned embodiment 3 in that the precursor powder of this embodiment is prepared by the following method: aluminum powder, iron hydroxide powder, iron powder, magnesium powder, and polyurethane emulsion with a solid content of 30wt.% 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, wherein the fineness of each powder is 200 mesh. Then the obtained mixture is dried at 60°C to constant weight, and then ground and sieved through an 80-mesh sieve to obtain a precursor powder.

[0051] The denitrification cement burning coal saving agent of this embodiment is mixed into the coal powder and mixed evenly, and the mixing amount is 0.4% of its mass. Then the coal saving rate and nitrogen oxide emission of the coal powder are tested, and the nitrogen oxide emission reduction rate is calculated (the method is the same as that of the above embodiment 1), and the results are as follows: coal saving rate = 13.94%, emission reduction rate = 63.01%.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a denitrification type cement burning coal saving agent, characterized in that: The steps include: (1) Aluminum powder, ferric hydroxide powder, iron powder, magnesium powder, silica sol, and polymer emulsion are mixed and stirred evenly, and then dried and ground to obtain a precursor powder; (2) placing the precursor powder in saturated lime water and reacting under heating conditions, separating the solid matter after completion, drying it, mixing it with the phosphating solution, standing it and then drying it, thereby obtaining a denitrification thermal aid; (3) The denitrification type cement burning coal saving agent is composed of a penetrant, a bulking agent, ferric citrate and the denitrification thermal aid as component A and hydrogen peroxide as component B.

2. The method for preparing the denitrification type cement burning coal saving agent according to claim 1, characterized in that: In step (1), the ratio of the aluminum powder, ferric hydroxide powder, iron powder, magnesium powder, silica sol and polymer emulsion is 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 cement burning coal saving agent according to claim 1, characterized in that: In step (1), the solid content of the polymer emulsion is 30-40 wt.%; Optionally, in step (1), the polymer emulsion includes any one of polyacrylate emulsion, polyvinyl acetate emulsion, and polyurethane emulsion.

4. The method for preparing the denitrification type cement burning coal saving agent according to claim 1, characterized in that: In step (2), the solid-liquid ratio of the precursor powder to saturated lime water is 1 g: 20-40 ml; Optionally, in step (1), the drying temperature is 60-80° C., and the mixture is dried to a constant weight at this temperature; Optionally, in step (1), the fineness of the precursor powder is 80-120 mesh.

5. The method for preparing the denitrification type cement burning coal saving agent according to claim 1, characterized in that: In step (2), the heating temperature is 40-50° C. and the reaction time is 7-10 hours.

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

7. The method for preparing a denitrification type cement burning 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 dodecylbenzene sulfonate, 1-1.2 parts by weight of ammonium molybdate, and 980-1050 parts by weight of water; Optionally, in step (2), the standing time is 10-15 min, the drying temperature is 60-70° C., and the time is 25-40 min.

8. The method for preparing a denitrification type cement burning coal saving agent according to claim 1, characterized in that: In step (3), the ratio of the penetrant, the leavening agent, the ferric citrate, the denitrification thermal aid, and the 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%.

9. The method for preparing the denitrification type cement burning coal saving agent according to any one of claims 1 to 8, characterized in that: In step (3), the penetrant includes any one of polyoxyethylene isooctyl alcohol ether, dodecyl trimethyl ammonium chloride, sodium dodecyl sulfonate, and alkylphenol polyoxyethylene ether; Optionally, in step (3), the leavening agent includes at least one of sodium chloride, potassium chloride, sodium bicarbonate, and sodium lignin sulfonate.

10. Use of the denitrification type cement burning coal saving agent obtained by the preparation method according to any one of claims 1 to 9 in coal powder; optionally, the addition amount of the coal saving agent is 0.4-1.0% of the mass of the coal powder.

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