A high-nitrogen water-soluble fertilizer and production method thereof

Abstract

The present invention relates to a high-nitrogen water-soluble fertilizer and a production method thereof, characterized in that the high-nitrogen water-soluble fertilizer has a nitrogen content of greater than or equal to 15%, an amide nitrogen content of greater than or equal to 60%, and further comprises auxiliary materials, wherein the auxiliary materials are urea powder and polyacrylamide; the weight of the auxiliary materials accounts for 1-2% of the weight of the urea; and the weight of the urea powder in the auxiliary materials is greater than that of the polyacrylamide. This application can improve the product quality of water-soluble fertilizers.

Description

Technical Field

[0001] The invention relates to a high-nitrogen water-soluble fertilizer and a production method thereof. Background Art

[0002] Water-saving agriculture can improve the utilization rate of water and fertilizer, and save manpower and material resources, so it has been widely used. The requirements for the fertilizers used are also high, that is, they must be fully water-soluble and quick-dissolving. In order to ensure quick dissolution, water-soluble fertilizers are usually prepared into powder. Since the powder has a large specific surface area, the equipment requirements during production are very high, that is, the interior of the feeder is required to be smooth. However, even if the interior of the feeder is smooth, the production of water-soluble fertilizers is affected by the seasons, especially the production of high-nitrogen fertilizers. High-nitrogen water-soluble fertilizers can be produced smoothly in spring, autumn and winter, but in summer production, there is a problem that product quality is difficult to meet the standards. Therefore, many water-soluble fertilizer manufacturers increase production in winter or spring and reduce production in summer to solve the problem that water-soluble fertilizer production quality is difficult to meet the standards in summer.

[0003] However, there are many types of water-soluble fertilizer ratios and market demand also changes. Therefore, even if fertilizer is prepared in advance, it is impossible to fully meet market demand. What is more important is that there is a problem of capital backlog when preparing fertilizer in advance, which puts pressure on the operation of the enterprise. In addition, preparing fertilizer in advance is affected by the market. This market influence includes price changes of fertilizer raw materials and market demand. Any fluctuation may bring operating risks to the enterprise. For example, after the fertilizer is prepared, the market price of raw materials falls, which invisibly leads to an increase in the operating costs of the enterprise.

[0004] At present, there is no solution to the problem that high-nitrogen water-soluble fertilizers are difficult to meet quality standards in summer production. This quality standard includes both weight and nutrients. There is also no solution to the problem that the backlog of funds caused by preparing fertilizers in advance affects the capital operation of the enterprise and poses operational risks. Summary of the Invention

[0005] The present invention provides a high-nitrogen water-soluble fertilizer and a production method thereof, which solve the following technical problems: 1) the problem that the quality of high-nitrogen water-soluble fertilizer is difficult to meet the standards during summer production; and 2) the problem that the backlog of funds caused by preparing fertilizer in advance affects the capital operation of the enterprise and poses an operating risk.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A high-nitrogen water-soluble fertilizer, wherein the nitrogen content of the high-nitrogen water-soluble fertilizer is greater than or equal to 15%, the amide nitrogen content of the nitrogen content is greater than or equal to 60%, and the amide nitrogen is provided by urea microparticles;

[0008] The urea particles are obtained by crushing urea granules;

[0009] The crushing is to set the mesh size of the crusher to 40 to 100 meshes;

[0010] The high-nitrogen water-soluble fertilizer further comprises an auxiliary material, which is a mixture of Fumei powder and polyacrylamide; the mass of the Fumei powder in the auxiliary material is greater than the mass of the polyacrylamide.

[0011] The hardness of the urea granules is greater than or equal to 50N.

[0012] The mesh number of the crusher is set according to the hardness of the urea granules. When the hardness of the selected urea granules is greater than or equal to 50N, the mesh number of the crusher is set to 40-100 meshes; when the hardness of the selected urea granules is less than or equal to 15N, the mesh number of the crusher is set to 40-60 meshes.

[0013] The mass ratio of the Fumei powder to the polyacrylamide in the auxiliary materials is 2-4:1-2.

[0014] The production method of high-nitrogen water-soluble fertilizer is characterized in that urea particles, water-soluble fertilizer raw materials and auxiliary materials are added into a container and mixed evenly, and then measured and packaged to obtain high-nitrogen water-soluble fertilizer;

[0015] The water-soluble fertilizer raw material is one or more of potassium dihydrogen phosphate, ammonium dihydrogen phosphate, ammonium sulfate, potassium pyrophosphate, potassium sulfate, potassium chloride and ammonium chloride;

[0016] The mass ratio of the urea particles, the water-soluble fertilizer raw material and the auxiliary material is 200-700:286-798:2-14.

[0017] The production method of high-nitrogen water-soluble fertilizer is characterized in that urea granules and auxiliary materials are added to a crusher for crushing to obtain urea microparticles; the urea microparticles and water-soluble fertilizer raw materials are added to a container and mixed, and the mixture is measured and packaged to obtain high-nitrogen water-soluble fertilizer;

[0018] The water-soluble fertilizer raw material is one or more of potassium dihydrogen phosphate, ammonium dihydrogen phosphate, ammonium sulfate, potassium pyrophosphate, potassium sulfate, potassium chloride and ammonium chloride;

[0019] The mass ratio of the urea granules to the auxiliary materials is 98-99:1-2; the mass ratio of the urea microparticles to the water-soluble fertilizer raw materials is 202-714:286-798.

[0020] The invention has the following beneficial technical effects:

[0021] 1) The high-nitrogen water-soluble fertilizer prepared in this application can solve the problem that the quality of high-nitrogen water-soluble fertilizer production in summer is difficult to meet the standards; the backlog of funds caused by preparing fertilizer in advance affects the capital operation of the enterprise and poses an operating risk.

[0022] 2) This application addresses the problem of high-nitrogen water-soluble fertilizers having difficulty meeting quality standards during summer production by setting the crusher's mesh size to 40-100 mesh and adding auxiliary materials. The auxiliary materials, Fumei powder, improve the fluidity of the high-nitrogen fertilizer, while polyacrylamide adsorbs free water to prevent the water-soluble fertilizer from dissolving and adhering due to high temperatures. The two work together to address the problem of high-nitrogen water-soluble fertilizers having difficulty meeting quality standards during summer production. This application further limits the mass of Fumei powder to greater than that of polyacrylamide, which can better address the problem of high-nitrogen water-soluble fertilizers having difficulty meeting quality standards during summer production.

[0023] 3) The present application selects a crushing mesh size of urea that matches the hardness of the urea granules, thereby solving the problem that the quality of nitrogen water-soluble fertilizer production in summer is difficult to meet the standards.

[0024] 4) The present application obtains urea microparticles by adding urea granules and auxiliary materials into a crusher for crushing; during the crushing process, the auxiliary materials are attached to the surface of the urea microparticles, thereby solving the problem that the quality of high-nitrogen water-soluble fertilizer production in summer is difficult to meet the standards; at the same time, it also solves the problem that the backlog of funds caused by the advance preparation of fertilizers by enterprises affects the capital operation of enterprises and poses operating risks. DETAILED DESCRIPTION

[0025] In order to better understand the above technical solution, the technical solution of the present invention is described in detail below with reference to preferred examples.

[0026] Example 1

[0027] A high-nitrogen water-soluble fertilizer having a nitrogen, phosphorus, and potassium ratio of 25-15-10, specifically comprising 435 parts of urea microparticles, 245 parts of industrial-grade monoammonium phosphate, 200 parts of potassium sulfate, 120 parts of ammonium sulfate, and 5 parts of auxiliary materials; wherein amide nitrogen accounts for 79% of the total nitrogen content; theoretical values: N: 25.2, P2O5; 14.8, K2O: 10.0, and total nutrients 50.0.

[0028] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 3:2;

[0029] The urea particles are obtained by crushing urea;

[0030] The crushing is to set the crusher to 40 meshes;

[0031] The urea is small-particle urea purchased from Shandong Hualu Hengsheng Chemical Co., Ltd., and its average hardness is 11.4N.

[0032] The production method of high-nitrogen water-soluble fertilizer comprises the following steps: adding urea particles, industrial-grade monoammonium phosphate, potassium sulfate, ammonium sulfate and auxiliary materials into a container and mixing them evenly; and then measuring and packaging the mixture to obtain the high-nitrogen water-soluble fertilizer.

[0033] Example 2

[0034] A high-nitrogen water-soluble fertilizer has a nitrogen, phosphorus, and potassium ratio of 25-15-10, specifically comprising 435 parts of urea microparticles, 245 parts of industrial-grade monoammonium phosphate, 200 parts of potassium sulfate, 100 parts of ammonium sulfate, and 5 parts of auxiliary materials; amidic nitrogen accounts for 79% of the total nitrogen content; theoretical values: N: 25.2, P2O5; 14.8, K2O: 10.0, and total nutrients 50.0.

[0035] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 3:2;

[0036] The urea particles are obtained by crushing urea;

[0037] The crushing is to set the crusher to 40 meshes;

[0038] The urea is small-particle urea purchased from Shandong Hualu Hengsheng Chemical Co., Ltd., and its average hardness is 11.4N.

[0039] Production method of high nitrogen water-soluble fertilizer:

[0040] Adding urea and auxiliary materials into a crusher for crushing to obtain urea particles;

[0041] Urea particles, industrial-grade monoammonium phosphate, potassium sulfate and ammonium sulfate are added into a container and mixed evenly, and then measured and packaged to obtain high-nitrogen water-soluble fertilizer.

[0042] Example 3

[0043] A high-nitrogen water-soluble fertilizer having a nitrogen, phosphorus, and potassium ratio of 25-15-10, specifically comprising 435 parts of urea microparticles, 245 parts of industrial-grade monoammonium phosphate, 200 parts of potassium sulfate, 120 parts of ammonium sulfate, and 5 parts of auxiliary materials; wherein amide nitrogen accounts for 79% of the total nitrogen content; theoretical values: N: 25.2, P2O5; 14.8, K2O: 10.0, and total nutrients 50.0.

[0044] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 3:2;

[0045] The urea particles are obtained by crushing urea;

[0046] The crushing is to set the crusher to 40 meshes;

[0047] The urea is large-particle urea purchased from Shandong Hualu Hengsheng Chemical Co., Ltd., and its average hardness is 74.3N.

[0048] The production method of high-nitrogen water-soluble fertilizer comprises the following steps: adding urea particles, industrial-grade monoammonium phosphate, potassium sulfate, ammonium sulfate and auxiliary materials into a container and mixing them evenly; and then measuring and packaging the mixture to obtain the high-nitrogen water-soluble fertilizer.

[0049] Example 4

[0050] A high-nitrogen water-soluble fertilizer has a nitrogen, phosphorus, and potassium ratio of 25-15-10, specifically comprising 435 parts of urea microparticles, 245 parts of industrial-grade monoammonium phosphate, 200 parts of potassium sulfate, 100 parts of ammonium sulfate, and 5 parts of auxiliary materials; amidic nitrogen accounts for 79% of the total nitrogen content; theoretical values: N: 25.2, P2O5; 14.8, K2O: 10.0, and total nutrients 50.0.

[0051] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 3:2;

[0052] The urea particles are obtained by crushing urea;

[0053] The crushing is to set the crusher to 40 meshes;

[0054] The urea is large-particle urea purchased from Shandong Hualu Hengsheng Chemical Co., Ltd., and its average hardness is 74.3N.

[0055] Production method of high nitrogen water-soluble fertilizer:

[0056] Adding urea and auxiliary materials into a crusher for crushing to obtain urea particles;

[0057] Urea particles, industrial-grade monoammonium phosphate, potassium sulfate and ammonium sulfate are added into a container and mixed evenly, and then measured and packaged to obtain high-nitrogen water-soluble fertilizer.

[0058] Example 5

[0059] A high-nitrogen water-soluble fertilizer having a nitrogen, phosphorus, and potassium ratio of 20-20-20, specifically comprising 415 parts of urea microparticles, 385 parts of industrial-grade potassium dihydrogen phosphate, 140 parts of potassium sulfate, 60 parts of ammonium sulfate, and 6 parts of auxiliary materials; wherein amide nitrogen accounts for 94.1% of the total nitrogen content; theoretical values: N: 20.2, P2O5; 19.9, K2O: 20.0, and total nutrients 60.1.

[0060] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 2:1;

[0061] The urea particles are obtained by crushing urea;

[0062] The crushing is to set the crusher to 60 mesh;

[0063] The urea is small-particle urea purchased from Shandong Hualu Hengsheng Chemical Co., Ltd., and its average hardness is 11.4N.

[0064] The production method of high-nitrogen water-soluble fertilizer comprises the following steps: adding urea particles, industrial-grade monoammonium phosphate, potassium sulfate, ammonium sulfate and auxiliary materials into a container and mixing them evenly; and then measuring and packaging the mixture to obtain the high-nitrogen water-soluble fertilizer.

[0065] Example 6

[0066] A high-nitrogen water-soluble fertilizer having a nitrogen, phosphorus, and potassium ratio of 20-20-20, specifically comprising 415 parts of urea microparticles, 385 parts of industrial-grade potassium dihydrogen phosphate, 140 parts of potassium sulfate, 60 parts of ammonium sulfate, and 6 parts of auxiliary materials; wherein amide nitrogen accounts for 94.1% of the total nitrogen content; theoretical values: N: 20.2, P2O5; 19.9, K2O: 20.0, and total nutrients 60.1.

[0067] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 2:1;

[0068] The urea particles are obtained by crushing urea;

[0069] The crushing is to set the crusher to 60 mesh;

[0070] The urea is small-particle urea purchased from Shandong Hualu Hengsheng Chemical Co., Ltd., and its average hardness is 11.4N.

[0071] Production method of high nitrogen water-soluble fertilizer:

[0072] Adding urea and auxiliary materials into a crusher for crushing to obtain urea particles;

[0073] Urea particles, industrial-grade monoammonium phosphate, potassium sulfate and ammonium sulfate are added into a container and mixed evenly, and then measured and packaged to obtain high-nitrogen water-soluble fertilizer.

[0074] Example 7

[0075] A high-nitrogen water-soluble fertilizer having a nitrogen, phosphorus, and potassium ratio of 20-20-20, specifically comprising 415 parts of urea microparticles, 385 parts of industrial-grade potassium dihydrogen phosphate, 140 parts of potassium sulfate, 60 parts of ammonium sulfate, and 6 parts of auxiliary materials; wherein amide nitrogen accounts for 94.1% of the total nitrogen content; theoretical values: N: 20.2, P2O5; 19.9, K2O: 20.0, and total nutrients 60.1.

[0076] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 2:1;

[0077] The urea particles are obtained by crushing urea;

[0078] The crushing is to set the crusher to 60 mesh;

[0079] The urea is Fudao large-particle urea, and its average hardness is 72.3N.

[0080] The production method of high-nitrogen water-soluble fertilizer comprises the following steps: adding urea particles, industrial-grade potassium dihydrogen phosphate, potassium sulfate, ammonium sulfate and auxiliary materials into a container and mixing them evenly; and then measuring and packaging the mixture to obtain the high-nitrogen water-soluble fertilizer.

[0081] Example 8

[0082] A high-nitrogen water-soluble fertilizer having a nitrogen, phosphorus, and potassium ratio of 20-20-20, specifically comprising 415 parts of urea microparticles, 385 parts of industrial-grade potassium dihydrogen phosphate, 140 parts of potassium sulfate, 60 parts of ammonium sulfate, and 6 parts of auxiliary materials; wherein amide nitrogen accounts for 94.1% of the total nitrogen content; theoretical values: N: 20.2, P2O5; 19.9, K2O: 20.0, and total nutrients 60.1.

[0083] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 2:1;

[0084] The urea particles are obtained by crushing urea;

[0085] The crushing is to set the crusher to 60 mesh;

[0086] The urea is Fudao large-particle urea, and its average hardness is 72.3N.

[0087] Production method of high nitrogen water-soluble fertilizer:

[0088] Adding urea and auxiliary materials into a crusher for crushing to obtain urea particles;

[0089] Urea particles, industrial-grade potassium dihydrogen phosphate, potassium sulfate and ammonium sulfate are added into a container and mixed evenly, and then measured and packaged to obtain high-nitrogen water-soluble fertilizer.

[0090] Example 9

[0091] A high-nitrogen water-soluble fertilizer has a nitrogen, phosphorus and potassium ratio of 30-10-10, comprising 600 parts of urea microparticles, 165 parts of industrial-grade monoammonium phosphate, 200 parts of potassium sulfate, 35 parts of ammonium sulfate and 8 parts of auxiliary materials; amide nitrogen accounts for 91.1% of the total nitrogen content; the theoretical values are: N: 30.1, P2O5; 10.0, K2O: 9.9, and total nutrients 50.0.

[0092] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 5:3;

[0093] The urea particles are obtained by crushing urea;

[0094] The crushing is to set the crusher to 40 meshes;

[0095] The urea is small-particle urea purchased from Shandong Hualu Hengsheng Chemical Co., Ltd., and its average hardness is 11.4N.

[0096] The production method of high-nitrogen water-soluble fertilizer comprises the following steps: adding urea particles, industrial-grade monoammonium phosphate, potassium sulfate, ammonium sulfate and auxiliary materials into a container and mixing them evenly; and then measuring and packaging the mixture to obtain the high-nitrogen water-soluble fertilizer.

[0097] Example 10

[0098] A high-nitrogen water-soluble fertilizer has a nitrogen, phosphorus and potassium ratio of 30-10-10, comprising 600 parts of urea microparticles, 165 parts of industrial-grade monoammonium phosphate, 200 parts of potassium sulfate, 35 parts of ammonium sulfate and 8 parts of auxiliary materials; amide nitrogen accounts for 91.1% of the total nitrogen content; the theoretical values are: N: 30.1, P2O5; 10.0, K2O: 9.9, and total nutrients 50.0.

[0099] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 5:3;

[0100] The urea particles are obtained by crushing urea;

[0101] The crushing is to set the crusher to 40 meshes;

[0102] The urea is small-particle urea purchased from Shandong Hualu Hengsheng Chemical Co., Ltd., and its average hardness is 11.4N.

[0103] Production method of high nitrogen water-soluble fertilizer:

[0104] Adding urea and auxiliary materials into a crusher for crushing to obtain urea particles;

[0105] Urea particles, industrial-grade monoammonium phosphate, potassium sulfate and ammonium sulfate are added into a container and mixed evenly, and then measured and packaged to obtain high-nitrogen water-soluble fertilizer.

[0106] Example 11

[0107] A high-nitrogen water-soluble fertilizer has a nitrogen, phosphorus and potassium ratio of 30-10-10, comprising 600 parts of urea microparticles, 165 parts of industrial-grade monoammonium phosphate, 200 parts of potassium sulfate, 35 parts of ammonium sulfate and 8 parts of auxiliary materials; amide nitrogen accounts for 91.1% of the total nitrogen content; the theoretical values are: N: 30.1, P2O5; 10.0, K2O: 9.9, and total nutrients 50.0.

[0108] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 5:3;

[0109] The urea particles are obtained by crushing urea;

[0110] The crushing is to set the crusher to 40 meshes;

[0111] The urea is Friendship large-granular urea, and its average hardness is 68.7N.

[0112] The production method of high-nitrogen water-soluble fertilizer comprises the following steps: adding urea particles, industrial-grade ammonium dihydrogen phosphate, potassium sulfate, ammonium sulfate and auxiliary materials into a container and mixing them evenly; and then measuring and packaging the mixture to obtain the high-nitrogen water-soluble fertilizer.

[0113] Example 12

[0114] A high-nitrogen water-soluble fertilizer has a nitrogen, phosphorus and potassium ratio of 30-10-10, comprising 600 parts of urea microparticles, 165 parts of industrial-grade monoammonium phosphate, 200 parts of potassium sulfate, 35 parts of ammonium sulfate and 8 parts of auxiliary materials; amide nitrogen accounts for 91.1% of the total nitrogen content; the theoretical values are: N: 30.1, P2O5; 10.0, K2O: 9.9, and total nutrients 50.0.

[0115] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 5:3;

[0116] The urea particles are obtained by crushing urea;

[0117] The crushing is to set the crusher to 40 meshes;

[0118] The urea is Friendship large-granular urea, and its average hardness is 68.7N.

[0119] Production method of high nitrogen water-soluble fertilizer:

[0120] Adding urea and auxiliary materials into a crusher for crushing to obtain urea particles;

[0121] Urea particles, industrial-grade ammonium dihydrogen phosphate, potassium sulfate and ammonium sulfate are added into a container and mixed evenly, and then measured and packaged to obtain high-nitrogen water-soluble fertilizer.

[0122] Example 13

[0123] A high-nitrogen water-soluble fertilizer having a nitrogen, phosphorus, and potassium ratio of 25-15-10, specifically comprising 435 parts of urea microparticles, 245 parts of industrial-grade monoammonium phosphate, 200 parts of potassium sulfate, 120 parts of ammonium sulfate, and 5 parts of auxiliary materials; wherein amide nitrogen accounts for 79% of the total nitrogen content; theoretical values: N: 25.2, P2O5; 14.8, K2O: 10.0, and total nutrients 50.0.

[0124] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 3:2;

[0125] The urea particles are obtained by crushing urea;

[0126] The crushing is to set the crusher to 80 meshes;

[0127] The urea is large-particle urea purchased from Shandong Hualu Hengsheng Chemical Co., Ltd., and its average hardness is 78.2N.

[0128] The production method of high-nitrogen water-soluble fertilizer comprises the following steps: adding urea particles, industrial-grade monoammonium phosphate, potassium sulfate, ammonium sulfate and auxiliary materials into a container and mixing them evenly; and then measuring and packaging the mixture to obtain the high-nitrogen water-soluble fertilizer.

[0129] Example 14

[0130] A high-nitrogen water-soluble fertilizer has a nitrogen, phosphorus, and potassium ratio of 25-15-10, specifically comprising 435 parts of urea microparticles, 245 parts of industrial-grade monoammonium phosphate, 200 parts of potassium sulfate, 100 parts of ammonium sulfate, and 5 parts of auxiliary materials; amidic nitrogen accounts for 79% of the total nitrogen content; theoretical values: N: 25.2, P2O5; 14.8, K2O: 10.0, and total nutrients 50.0.

[0131] The auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 3:2;

[0132] The urea particles are obtained by crushing urea;

[0133] The crushing is to set the crusher to 80 meshes;

[0134] The urea is large-particle urea purchased from Shandong Hualu Hengsheng Chemical Co., Ltd., and its average hardness is 78.2N.

[0135] Production method of high nitrogen water-soluble fertilizer:

[0136] Adding urea and auxiliary materials into a crusher for crushing to obtain urea particles;

[0137] Urea particles, industrial-grade monoammonium phosphate, potassium sulfate, and ammonium sulfate are added to a container and mixed evenly. After metering and packaging, a high-nitrogen water-soluble fertilizer is obtained. The hardness test method in the above embodiment is to randomly select 30 grains and use a fertilizer hardness tester to test the hardness and obtain the average hardness of the 30 grains. The following is a further explanation of the beneficial effects of the present invention in combination with test data:

[0138] Test materials

[0139] 1.1 Experimental location: Shandong Aiguozhe Biotechnology Co., Ltd.

[0140] 1.2 Experimental testing: The weight (kg) and nutrients of the prepared products were tested. The nutrients included nitrogen (N) (%), phosphorus (P2O5) (%), potassium (K2O) (%) and total nutrients (%).

[0141] 1.3 Test objects: CK1 (except that no excipients were added, the other preparations were consistent with Example 1), CK2 (except that the mesh number of the crusher was 80 mesh, the other preparations were consistent with Example 1), CK3 (except that the mesh number of the crusher was 20 mesh, the other preparations were consistent with Example 1), CK4 (except that the excipients were a combination of Fumei powder and polyacrylamide in a mass ratio of 2:3, the other preparations were consistent with Example 1), Examples 1 to 4, CK5 (except that no excipients were added, the other preparations were consistent with Example 5), CK6 (except that the mesh number of the crusher was 80 mesh, the other preparations were consistent with Example 5), CK7 (except that the mesh number of the crusher was CK8 (except that the auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 1:2, the others are the same as Example 5) and Examples 5 to 8; CK9 (except that no auxiliary material is added, the others are the same as Example 9), CK10 (except that the mesh number of the crusher is 80 mesh, the others are the same as Example 9), CK11 (except that the mesh number of the crusher is 20 mesh, the others are the same as Example 9), CK12 (except that the auxiliary material is a composition of Fumei powder and polyacrylamide in a mass ratio of 3:5, the others are the same as Example 9) and Examples 9 to 12.

[0142] 1.4 Test method: Nutrients were added in accordance with NY / T 1107-2020 Macronutrient Water-Soluble Fertilizers. 50 bags were weighed, each weighing 5 kg, and the average value was taken.

[0143] Note: The production environment temperature is 28°C, the relative humidity is 67%, and the metering setting is 5.50kg;

[0144] The diameter of large-particle urea is 2 to 4.8 mm, and the diameter of small-particle urea is 0.8 to 2 mm.

[0145] The weight requirement is greater than or equal to 5-0.005kg; the absolute value of the negative deviation between the measured value of a single nutrient content and the marked value is ≤1.5%, and the absolute value of the negative deviation between the measured value of the total nutrient content and the marked value is not greater than 0.5%.

[0146] The sampling adopts the four-corner sampling method. For the sampling of high nitrogen content, the angle of the sampler insertion is slightly tilted upward. This is because the specific gravity of nitrogen is lower than that of phosphorus and potassium, so the sampling angle is slightly tilted upward.

[0147] In order to ensure the qualified production of products, the theoretical value calculation in the formula is based on the lower limit of each material, and the actual production content of the product is slightly higher than the theoretical value.

[0148] 2 Results and Analysis

[0149] The average values of weight (kg), N (%), P2O5 (%), K2O (%) and total nutrients (%) for each treatment are shown in Table 1

[0150] Table 1

[0151]

[0152]

[0153] From the data comparison between CK1 and Example 1, CK5 and Example 4, and CK9 and Example 9 in Table 1, it can be seen that the addition of auxiliary materials directly affects the metering packaging and nutrient content of production. CK1, CK5, and CK9 are unqualified in terms of both weight and nitrogen content in nutrient content, and cannot meet the needs of summer production.

[0154] From the data comparison of CK2 and Example 1, CK6 and Example 4, CK10 and Example 9 in Table 1, it can be seen that the mesh size of the selected urea is 80 mesh, which affects the metering packaging and nutrient content of production. CK2 and CK10 are unqualified in terms of both weight and nitrogen content in nutrient content, and cannot meet the needs of summer production. Although CK6 has qualified nutrient content, it is unqualified in weight and cannot meet the needs of summer production.

[0155] From the data comparison of CK3 and Example 1, CK7 and Example 4, CK11 and Example 9 in Table 1, it can be seen that the mesh size of the selected urea is 20 mesh, which mainly affects the nutrient content. There is a high nitrogen nutrient content, and the phosphorus and potassium contents are lower than the designed content, that is, there is a large deviation between the theoretical value and the actual value. Although the weight meets the requirements, the large deviation between the theoretical value and the actual value brings difficulty to the formula calculation, and it is easy to have a single nutrient unqualified phenomenon. Therefore, it is difficult to meet the requirements of summer production.

[0156] It can be seen that the mesh size of the selected urea also affects the summer production of the product.

[0157] From the data comparison of CK4 and Example 1, CK8 and Example 4, CK12 and Example 9 in Table 1, it can be seen that the weights of CK4, CK8 and CK2 all failed the test, while Examples 1, 4 and 9 all passed. It can be seen that when the mass fraction of polyacrylamide in the excipient is greater than that of Fumei powder, the metering of the product is affected. When the mass fraction of Fumei powder is greater than that of polyacrylamide, the metering deviation during production can be significantly reduced, meeting the production needs in summer.

[0158] From the data comparison between Example 1 and Example 2, Example 5 and Example 6, and Example 9 and Example 10, it can be seen that Example 2, Example 6 and Example 10, in which urea and auxiliary materials are added to the crusher for crushing, are more accurate in terms of metering than Example 1, Example 5 and Example 9, in which auxiliary materials and fertilizer raw materials are mixed.

[0159] From the data comparison between Example 1 and Example 3, Example 5 and Example 7, and Example 9 and Example 11, it can be seen that the use of large-particle urea with high hardness can be more accurate in metering and can better meet the needs of summer production.

[0160] By comparing the data of Example 3 and Example 4, Example 7 and Example 8, and Example 11 and Example 12, it can be seen that the measurement of Example 4, Example 8 and Example 12 in which urea and auxiliary materials are added to the crusher for crushing is more accurate than that of Example 3, Example 7 and Example 11 in which the auxiliary materials and fertilizer raw materials are mixed.

[0161] From the data comparison of CK2 (urea hardness is 11.4N, except that the mesh number of the crusher is 80 mesh, the other preparations are consistent with Example 1) and Example 13 (urea hardness is 78.2N, the mesh number of the crusher is 80 mesh), it can be seen that even if the mesh number is the same, the hardness of the selected urea is different, and the results are also different. Therefore, the mesh number of the crusher is set according to the hardness of the urea. When the selected urea hardness is greater than or equal to 50N, the mesh number of the crusher is set to 40-100 mesh; when the selected urea hardness is less than or equal to 15N, the mesh number of the crusher is set to 40-60 mesh.

Claims

1. A high-nitrogen water-soluble fertilizer, characterized in that The high-nitrogen water-soluble fertilizer has a nitrogen content of 20-30%, a phosphorus content of 10-20%, and a potassium content of 10-20%. The amide nitrogen content in the nitrogen content is greater than or equal to 79%, and the amide nitrogen is provided by urea particles, which are obtained by crushing urea granules with a hardness of 11.4-78.2N through a crusher set to a mesh size of 40-80. The high-nitrogen water-soluble fertilizer further comprises an auxiliary material, which is a mixture of Fumei powder and polyacrylamide; the mass of the Fumei powder in the auxiliary material is greater than the mass of the polyacrylamide.

2. high nitrogen water-soluble fertilizer as claimed in claim 1, is characterized in that, The mass ratio of the Fumei powder to the polyacrylamide in the auxiliary materials is 2-4:1-2.

3. The production method of high nitrogen water-soluble fertilizer as claimed in claim 1 or 2, characterized in that, The urea particles, water-soluble fertilizer raw materials and auxiliary materials are added into a container and mixed evenly, and then measured and packaged to obtain high-nitrogen water-soluble fertilizer; The water-soluble fertilizer raw materials are potassium dihydrogen phosphate, ammonium dihydrogen phosphate and ammonium sulfate or potassium sulfate.

4. A method for producing high-nitrogen water-soluble fertilizer, characterized in that: The high-nitrogen water-soluble fertilizer has a nitrogen content of 20-30%, a phosphorus content of 10-20%, a potassium content of 10-20%, and an amide nitrogen content of greater than or equal to 79%. The amide nitrogen is provided by urea particles, which are obtained by crushing urea granules with a hardness of 11.4-78.2N and auxiliary materials in a crusher set to a mesh size of 40-80. The high nitrogen water-soluble fertilizer further comprises an auxiliary material, which is a mixture of Fumei powder and polyacrylamide; The mass of the Fumei powder in the auxiliary material is greater than the mass of polyacrylamide; The urea particles and the water-soluble fertilizer raw materials are added into a container and mixed evenly, and then measured and packaged to obtain the high-nitrogen water-soluble fertilizer; The water-soluble fertilizer raw materials are potassium dihydrogen phosphate, ammonium dihydrogen phosphate and ammonium sulfate or potassium sulfate.

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