Organic-inorganic compound fertilizer as well as preparation method and application thereof

Abstract

The invention provides an organic-inorganic compound fertilizer as well as a preparation method and application thereof. The organic-inorganic compound fertilizer comprises the following components in parts by weight: 20-60 parts of urea, 25-35 parts of potash fertilizer, 10-30 parts of phosphate fertilizer, 5-15 parts of organic material, 1-5 parts of alkaline substance and 0-2 parts of filler. Therefore, the organic-inorganic compound fertilizer disclosed by the invention has relatively high particle strength and relatively low water content, so that fertilizer particles are more durable in storage and use processes, the risks of pulverization and caking are reduced, and long-term stability and reliability are ensured; besides, the organic-inorganic compound fertilizer not only contains high-concentration inorganic and organic nutrients and can provide comprehensive nutritional support for crops, but also can effectively prolong the release period of nitrogen, improve the utilization rate of the nitrogen fertilizer and reduce the loss of the nitrogen, thereby improving the yield and quality of the crops.

Description

Technical Field

[0001] The present invention relates to the technical field of fertilizers, and in particular to an organic-inorganic compound fertilizer and a preparation method and application thereof. Background Art

[0002] During the production, storage and use of organic and inorganic fertilizer products, problems such as instability, pulverization and agglomeration of organic raw materials are often encountered, which seriously affect product quality and application effect. Due to the nature of the raw materials, most organic materials have strong hygroscopicity, which makes the products prone to agglomeration and pulverization. At the same time, drastic changes in temperature and storage conditions will also have a great impact on the physical properties of the product, thereby affecting the application and product effect.

[0003] At present, most of the organic-inorganic compound fertilizer products on the market are produced by the drum method, and are mainly simple mixing of inorganic and organic particles. During the production, transportation and storage processes, physical problems such as pulverization, moisture absorption and stratification are prone to occur, and the acceptance level among farmers is poor. There are few manufacturers that use the high-tower melt granulation process to produce organic-inorganic compound fertilizers, and they can only produce products with low inorganic nutrients (≤40%) and low phosphorus (≤5%).

[0004] Therefore, there is an urgent need to develop a product with better quality stability, stronger particle strength, higher nutrient content, better product effect and the ability to increase the level of organic matter in the soil and the utilization rate of nitrogen fertilizer. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art to at least a certain extent.

[0006] In the first aspect of the present invention, the present invention proposes an organic-inorganic compound fertilizer. According to an embodiment of the present invention, the organic-inorganic compound fertilizer includes: 20-60 parts by weight of urea; 25-35 parts by weight of potash fertilizer; 10-30 parts by weight of phosphate fertilizer; 5-15 parts by weight of organic material; 1-5 parts by weight of alkaline substance; 0-2 parts by weight of filler. As a result, the organic-inorganic compound fertilizer of the present invention has strong particle strength and low water content, which can make the fertilizer particles more durable during storage and use, reduce the risk of pulverization and agglomeration, and ensure long-term stability and reliability; in addition, the organic-inorganic compound fertilizer not only contains high concentrations of inorganic and organic nutrients, which can provide comprehensive nutritional support for crops, but also can effectively prolong the release cycle of nitrogen, improve the utilization rate of nitrogen fertilizer, and reduce the loss of nitrogen, thereby improving the yield and quality of crops.

[0007] According to an embodiment of the present invention, the organic-inorganic compound fertilizer may further include at least one of the following additional technical features:

[0008] According to an embodiment of the present invention, the potash fertilizer includes at least one of potassium chloride, potassium sulfate, potassium nitrate, and potassium dihydrogen phosphate.

[0009] According to an embodiment of the present invention, the phosphate fertilizer includes monoammonium phosphate.

[0010] According to an embodiment of the present invention, the organic material includes at least one of lignite, sodium humate, potassium humate, and ammonium humate.

[0011] According to an embodiment of the present invention, the alkaline substance includes at least one of sodium hydroxide, potassium hydroxide and calcium hydroxide.

[0012] According to an embodiment of the present invention, the filler includes at least one of dolomite powder, attapulgite, and glauber salt.

[0013] According to an embodiment of the present invention, the inorganic nutrient content in the organic-inorganic compound fertilizer is not less than 40%, the organic nutrient content is not less than 7%, the phosphorus content is not less than 5%, and the water content is less than 1%.

[0014] In the second aspect of the present invention, the present invention proposes a method for preparing the organic-inorganic compound fertilizer described in the first aspect. According to an embodiment of the present invention, the method comprises: melting urea and a first potash fertilizer to obtain a eutectic; performing a first mixing treatment on the eutectic and a second potash fertilizer to obtain a first mixed treatment product; reacting the first mixed treatment product with an organic material to obtain a reaction treatment product; performing a second mixed reaction treatment on the reaction treatment product with a phosphate fertilizer, an alkaline substance and optionally a filler to obtain a second mixed treatment product; spraying and granulating the second mixed treatment product to obtain the organic-inorganic compound fertilizer. Thus, the preparation method of the present invention has a simple process, strong operability, low risk of slurry bubbling, and can be directly produced without complicated transformation of the existing high tower device; in addition, by adjusting the process parameters, not only the stability and fluidity of the slurry are enhanced, but also the efficient production of organic-inorganic compound fertilizers with high concentrations of inorganic nutrients is realized; in addition, the prepared organic-inorganic compound fertilizer product has stable physical properties, high particle strength, is not easy to pulverize, has good product application effect, can also increase soil organic matter content and nitrogen fertilizer utilization rate, and improve crop yield and quality.

[0015] According to an embodiment of the present invention, the mass ratio of the urea to the first potash fertilizer is (20-60):(1-5).

[0016] According to an embodiment of the present invention, the first potash fertilizer is potassium chloride.

[0017] According to an embodiment of the present invention, the second potash fertilizer is potassium sulfate.

[0018] According to an embodiment of the present invention, the temperature of the melting treatment is 90°C-130°C.

[0019] According to an embodiment of the present invention, the temperature of the first mixing treatment is 100°C-130°C.

[0020] According to an embodiment of the present invention, the mass ratio of the urea to the organic material in the first mixed treatment product is (3-8):1.

[0021] According to an embodiment of the present invention, the temperature of the reaction treatment is 100°C-135°C.

[0022] According to an embodiment of the present invention, the reaction treatment time is 1 min-20 min.

[0023] According to an embodiment of the present invention, the temperature of the second mixing treatment is 120°C-135°C.

[0024] According to an embodiment of the present invention, the pH value of the second mixed treatment product is 5-7.5.

[0025] According to an embodiment of the present invention, before the reaction treatment, the method further comprises: performing a first preheating treatment on the organic material.

[0026] According to an embodiment of the present invention, the temperature of the first preheating treatment is 70°C-90°C.

[0027] According to an embodiment of the present invention, before the second mixing treatment, the method further comprises: performing a second preheating treatment on the phosphate fertilizer, the alkaline substance and the optional filler.

[0028] According to an embodiment of the present invention, the temperature of the second preheating treatment is 70°C-90°C.

[0029] According to an embodiment of the present invention, the spray granulation process comprises: spraying the mixed reaction product from the top of a high tower to the bottom of the tower, and the bottom of the tower has rising gas.

[0030] According to an embodiment of the present invention, the temperature of the gas is 35°C-55°C.

[0031] In the third aspect of the present invention, the present invention proposes a method for increasing crop yield and / or apparent utilization rate of nitrogen fertilizer. According to an embodiment of the present invention, the method comprises: applying the organic-inorganic compound fertilizer described in the first aspect or the organic-inorganic compound fertilizer prepared by the method described in the second aspect to the crop. As mentioned above, the organic-inorganic compound of the present invention has stable properties, high particle strength, is not easy to pulverize, has good product application effect, and can also increase soil organic matter content and nitrogen fertilizer utilization rate. Therefore, the use of the organic-inorganic compound fertilizer can increase crop yield and / or nitrogen fertilizer utilization rate.

[0032] According to an embodiment of the present invention, the crop includes at least one of cotton, Arabidopsis, rice, corn, wheat, sorghum, barley, oats, rye, soybean, tobacco, rapeseed, and tomato.

[0033] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0035] Figure 1 The present invention is a flow chart of preparing organic-inorganic compound fertilizer according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0037] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Further, in the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0038] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0039] In this document, the terms “include” or “comprising” are open expressions, that is, including the contents specified in the present invention but not excluding other contents.

[0040] As used herein, the terms "optionally", "optional" or "optionally" generally mean that the subsequently described event or circumstance may but need not occur, and that the description includes instances where the event or circumstance occurs and instances where it does not.

[0041] Organic and inorganic compound fertilizer

[0042] The present invention provides an organic-inorganic compound fertilizer. According to an embodiment of the present invention, the organic-inorganic compound fertilizer comprises: 20-60 parts by weight of urea; 25-35 parts by weight of potash fertilizer; 10-30 parts by weight of phosphate fertilizer; 5-15 parts by weight of organic material; 1-5 parts by weight of alkaline substance; and 0-2 parts by weight of filler.

[0043] Therefore, the organic-inorganic composite fertilizer of the present invention has good physical and chemical properties, namely, strong particle strength, low water content and excellent anti-powdering performance, which can make the fertilizer particles more durable during storage and use, reduce the risk of powdering and agglomeration, and ensure long-term stability and reliability; in addition, the organic-inorganic composite fertilizer contains high concentrations of inorganic and organic nutrients, which can provide comprehensive nutritional support for crops, thereby improving the yield and quality of crops; in addition, the composite fertilizer can also increase the organic matter in the soil, improve the soil structure, effectively prolong the release cycle of nitrogen, improve the utilization rate of nitrogen fertilizer, and reduce the loss of nitrogen.

[0044] It should be noted that the organic-inorganic compound fertilizer of the present invention may or may not contain fillers. The fillers can improve the soil structure, increase the water retention and air permeability of the soil, and thus improve the soil quality.

[0045] Illustratively, the weight percentage of the urea may be 20, 25, 30, 35, 40, 45, 50, 55, 60, etc., or may be a range consisting of any of the above values.

[0046] Illustratively, the weight portion of the potash fertilizer may be 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, etc., or may be a range consisting of any of the above values.

[0047] Illustratively, the weight percentage of the phosphate fertilizer may be 10, 12, 15, 17, 20, 22, 25, 28, 30, etc., or may be a range consisting of any of the above values.

[0048] Illustratively, the weight portion of the organic material can be 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, etc., or can be a range consisting of any of the above values.

[0049] For example, the weight portion of the alkaline substance can be 1, 2, 3, 4, 5, etc., or can be a range consisting of any of the above values.

[0050] For example, the weight percentage of the filler can be 0, 1, 2, etc., or can be a range consisting of any of the above values.

[0051] In some embodiments of the present invention, the urea may be selected from 46% large particle urea or 46% small particle urea.

[0052] In some embodiments of the present invention, the potash fertilizer includes but is not limited to at least one of potassium chloride, potassium sulfate, potassium nitrate, and potassium dihydrogen phosphate. Among them, potassium chloride can be selected from 60% powdered potassium chloride or 62% powdered potassium chloride; potassium sulfate can be selected from 50% powdered potassium sulfate or 52% powdered potassium sulfate.

[0053] In some embodiments of the present invention, the phosphate fertilizer includes but is not limited to monoammonium phosphate, wherein the monoammonium phosphate can be selected from 60% monoammonium phosphate, 66% monoammonium phosphate, 72% monoammonium phosphate, 73% monoammonium phosphate or a combination thereof.

[0054] In some embodiments of the present invention, the organic material includes but is not limited to at least one of lignite, sodium humate, potassium humate, and ammonium humate. Among them, sodium humate, potassium humate, and ammonium humate are all generated by activating weathered coal, wherein the organic matter content on a dry basis is ≥70%, the water content is ≤10%, and the chloride ion content is ≤1%.

[0055] In some embodiments of the present invention, the alkaline substance includes but is not limited to at least one of sodium hydroxide, potassium hydroxide, and calcium hydroxide.

[0056] In some embodiments of the present invention, the filler includes but is not limited to at least one of dolomite powder, attapulgite, and glauber salt.

[0057] According to an embodiment of the present invention, the inorganic nutrient content in the organic-inorganic compound fertilizer is not less than 40%, the organic nutrient content is not less than 7%, the phosphorus content is not less than 5%, and the water content is less than 1%. Thus, the organic-inorganic compound fertilizer of the present invention contains high concentrations of inorganic and organic nutrients, which can provide comprehensive nutritional support for crops, thereby improving the yield and quality of crops.

[0058] Method for preparing organic-inorganic compound fertilizer

[0059] The present invention proposes a method for preparing the above organic-inorganic compound fertilizer. Figure 1 , the method comprising:

[0060] S100: Melt treatment

[0061] The urea and the first potash fertilizer are melt-treated to obtain a eutectic. In some embodiments of the present invention, the urea and the first potash fertilizer are heated in a melting tank for melt-treatment to obtain a eutectic.

[0062] In some embodiments of the present invention, the mass ratio of the urea to the first potash fertilizer is (20-60):(1-5), for example, 20:1, 20:3, 30:4, 40:1, 50:3, 60:1, etc., or a range consisting of any of the above values.

[0063] In some embodiments of the present invention, the first potash fertilizer is potassium chloride, wherein the potassium chloride can be selected from 60% powdered potassium chloride or 62% powdered potassium chloride.

[0064] In some embodiments of the present invention, the temperature of the melt treatment is 90°C-130°C. For example, it can be 90°C, 100°C, 110°C, 120°C, 130°C, etc., or it can be a range composed of any of the above values. According to an embodiment of the present application, the temperature of the melt treatment is 100°C-125°C. Thus, by making the temperature of the melt treatment within the above range, urea can be fully melted at a lower temperature and mixed evenly with the first potash fertilizer, thereby improving the stability and fluidity of the slurry.

[0065] It should be noted that the present invention does not impose any specific limitation on the time of the melting treatment, as long as the urea can be completely melted and the eutectic has good fluidity.

[0066] S200: First mixing process

[0067] After the eutectic is subjected to a first mixing treatment with the second potash fertilizer, a first mixed treatment product is obtained. In some embodiments of the present invention, the eutectic and the second potash fertilizer are subjected to a first mixing treatment in a primary mixing tank to obtain a first mixed treatment product.

[0068] In some embodiments of the present invention, the second potash fertilizer is potassium sulfate, wherein the potassium sulfate can be selected from 50% powdered potassium sulfate or 52% powdered potassium sulfate.

[0069] In some embodiments of the present invention, the temperature of the first mixing treatment is 100°C-130°C. For example, it can be 100°C, 105°C, 110°C, 115°C, 120°C, 125°C, 130°C, etc., or it can be a range composed of any of the above values. Therefore, by making the temperature of the first mixing treatment within the above range, it is helpful to form a more stable and uniform mixed treatment product. It should be noted that the present invention does not specifically limit the time of the first mixing treatment, as long as the substances can be mixed evenly.

[0070] S300: Reaction Processing

[0071] The first mixed treatment product is reacted with the organic material to obtain a reaction treatment product. In some embodiments of the present invention, the first mixed treatment product overflows into a secondary mixing tank, and the organic material is added to the secondary mixing tank for reaction treatment. As a result, urea in the first mixed treatment product can react with the organic material to form humic acid urea, thereby extending the nitrogen release cycle and improving the nitrogen fertilizer utilization rate.

[0072] In some embodiments of the present invention, the mass ratio of the urea to the organic material in the first mixed treatment product is (3-8):1. For example, it can be 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, etc., or it can be a range composed of any of the above values. According to an embodiment of the present application, the mass ratio of the urea to the organic material is (3-6):1. Thus, by making the mass ratio of urea to the organic material in the first mixed treatment product within the above range, urea and the organic material can undergo a carbonyl-ammonia reaction to form humic acid urea, thereby extending the nitrogen release cycle and improving the nitrogen fertilizer utilization rate.

[0073] In some embodiments of the present invention, the temperature of the reaction treatment is 100°C-135°C. For example, it can be 100°C, 105°C, 110°C, 115°C, 120°C, 125°C, 130°C, 135°C, etc., or it can be a range composed of any of the above values. In some embodiments of the present invention, the time of the reaction treatment is 1min-20min. For example, it can be 1min, 3min, 5min, 10min, 15min, 20min, etc., or it can be a range composed of any of the above values. Thus, by making the temperature and time of the reaction treatment within the above range, the urea in the first mixed treatment product and the organic material can be fully reacted with carbonylamine to form humic acid urea.

[0074] In some embodiments of the present invention, before subjecting the organic material to the reaction treatment, the step further includes: subjecting the organic material to a first preheat treatment. According to an embodiment of the present invention, the temperature of the first preheat treatment is 70°C-90°C. For example, it may be 70°C, 75°C, 80°C, 85°C, 90°C, etc., or may be a range of any of the above values. Thus, it can help to uniformly mix the organic material and the mixed treatment product, and avoid uneven mixing due to excessive temperature difference, which may cause poor slurry fluidity and incomplete reaction.

[0075] S400: Second Mixing Process

[0076] The reaction product is subjected to a second mixing treatment with phosphate fertilizer, alkaline substance and optionally filler to obtain a second mixed product. In some embodiments of the present invention, phosphate fertilizer, alkaline substance and optionally filler are added to a secondary mixing tank and subjected to a second mixing treatment with the reaction product to obtain a second mixed product.

[0077] In some embodiments of the present invention, the temperature of the second mixing treatment is 120°C-135°C. For example, it can be 120°C, 122°C, 125°C, 127°C, 130°C, 132°C, 135°C, etc., or it can be a range composed of any of the above values. Therefore, by making the temperature of the second mixing treatment within the above range, it is helpful to form a more stable and uniform mixed treatment product. It should be noted that the present invention does not specifically limit the time of the second mixing treatment, as long as the substances can be mixed evenly.

[0078] In some embodiments of the present invention, the pH value of the second mixed treatment product is 5-7.5. For example, it can be 5, 5.5, 6, 6.5, 7, 7.5, etc., or it can be a range composed of any of the above values. The pH value of the second mixed treatment product can be adjusted by adjusting the amount of alkaline substance added.

[0079] In some embodiments of the present invention, before the phosphate fertilizer, the alkaline substance and the optional filler are subjected to a second mixing treatment, the method further comprises: subjecting the phosphate fertilizer, the alkaline substance and the optional filler to a second preheating treatment. According to an embodiment of the present invention, the temperature of the second preheating treatment is 70°C-90°C. For example, it may be 70°C, 75°C, 80°C, 85°C, 90°C, etc., or it may be a range composed of any of the above numerical values. Thus, it can help to uniformly mix the reaction treatment product, the phosphate fertilizer, the alkaline substance and the optional filler with the reaction treatment product, and avoid uneven mixing and poor slurry fluidity caused by excessive temperature difference.

[0080] S500: Spray granulation

[0081] The second mixed product is subjected to a spraying granulation treatment to obtain the organic-inorganic compound fertilizer. In some embodiments of the present invention, the spraying granulation treatment includes: spraying the second mixed product from the top of a high tower to the bottom of a tower, where there is rising gas. The particles obtained by the spraying granulation treatment can be heat exchanged and dehumidified with the rising gas at the bottom of the tower, thereby ensuring that the organic-inorganic compound fertilizer particles with a water content of less than 1% are obtained.

[0082] In some embodiments of the present invention, the temperature of the gas is 35° C.-55° C. For example, it may be 35° C., 40° C., 45° C., 50° C., 55° C., etc., or may be a range consisting of any of the above values.

[0083] Therefore, the preparation method of the present invention has simple process, strong operability, low risk of slurry bubbling, and direct production without complicated modification of the existing high tower device; in addition, by adjusting the process parameters, not only the stability and fluidity of the slurry are enhanced, but also the efficient production of organic-inorganic compound fertilizer with high concentration of inorganic nutrients is achieved; in addition, the prepared organic-inorganic compound fertilizer product has stable physical properties, high particle strength, is not easy to pulverize, has good product application effect, and can also increase the soil organic matter content and nitrogen fertilizer utilization rate, and improve crop yield and quality.

[0084] application

[0085] The present invention proposes a method for increasing crop yield and / or apparent utilization rate of nitrogen fertilizer. According to an embodiment of the present invention, the method comprises: applying the above-mentioned organic-inorganic compound fertilizer or the organic-inorganic compound fertilizer prepared by the above-mentioned method to the crop. As mentioned above, the organic-inorganic compound of the present invention has stable properties, high particle strength, is not easy to pulverize, has good product application effect, and can also increase soil organic matter content and nitrogen fertilizer utilization rate. Therefore, the use of the organic-inorganic compound fertilizer can increase crop yield and / or nitrogen fertilizer utilization rate.

[0086] In some embodiments of the present invention, the crop comprises at least one of cotton, Arabidopsis, rice, corn, wheat, sorghum, barley, oats, rye, soybean, tobacco, rapeseed, and tomato.

[0087] The scheme of the present invention will be explained below in conjunction with the embodiments. It will be appreciated by those skilled in the art that the following embodiments are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. Where specific techniques or conditions are not indicated in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. The reagents or instruments used are not indicated by the manufacturer and are all conventional products that can be obtained commercially.

[0088] It should be noted that the "7-48s (16-16-16)" in the "organic-inorganic compound fertilizer 7-48s (16-16-16)" described in the embodiments of the present invention is an expression of organic-inorganic compound fertilizer, wherein 7 indicates that the organic matter content in the organic-inorganic compound fertilizer is 7%, 48 indicates that the total nutrient content in the organic-inorganic compound fertilizer is 48%, s indicates that the organic-inorganic compound fertilizer is a sulfur-based compound fertilizer, and 16-16-16 indicates that the ratio of nitrogen, phosphorus and potassium in the organic-inorganic compound fertilizer is 16:16:16.

[0089] Example 1

[0090] Recipe sheet:

[0091] The raw materials required for the high tower organic-inorganic compound fertilizer 7-48s (16-16-16) are: 33 parts by mass of 46% urea, 3 parts by mass of 60% potassium chloride, 26 parts by mass of 52% potassium sulfate, 25.5 parts by mass of 73% monoammonium phosphate, 9.5 parts by mass of sodium humate, 1 part by mass of sodium sulfate, and 2 parts by mass of sodium hydroxide.

[0092] Preparation process:

[0093] 1. Add 33 parts by mass of 46% urea and 3 parts by mass of 60% potassium chloride into a melting tank and heat to melt at a reaction temperature of 110°C to form a eutectic;

[0094] 2. The eutectic in the melting tank overflows into the primary mixing tank, 26 parts by mass of 52% potassium sulfate is added into the primary mixing tank for stirring, the temperature is controlled at 115°C, a mixed treatment product is obtained, and then overflows into the secondary mixing tank;

[0095] 3. Preheat 9.5 parts by mass of sodium humate (the mass ratio of sodium humate to urea is 1:3.47) to 80°C, add it to the secondary mixing tank, and keep the temperature at 125°C for reaction for 3 minutes; then preheat 25.5 parts by mass of 73% monoammonium phosphate, 1 part by mass of sodium sulfate and 2 parts by mass of sodium hydroxide to 80°C, add them to the secondary mixing tank for stirring, control the temperature at 130°C, and prepare a mixed slurry with a pH of about 6.5, and then spray the mixed slurry from the top of the high tower for granulation;

[0096] 4. The particles obtained by spraying granulation are heat exchanged and dehumidified with the 50°C gas rising from the bottom of the tower, and the moisture content of the particles is reduced to about 0.5%. The granular materials falling into the bottom of the tower are then cooled, screened, coated, and finally packaged with inner ties to obtain 7-48s (16-16-16) high-tower organic-inorganic compound fertilizer products.

[0097] Example 2

[0098] Recipe sheet:

[0099] The raw materials required for the high tower organic-inorganic compound fertilizer 7-46s (22-6-18) are: 45.5 parts by mass of 46% urea, 3 parts by mass of 60% potassium chloride, 31 parts by mass of 52% potassium sulfate, 10 parts by mass of 73% monoammonium phosphate, 9.5 parts by mass of sodium humate, and 1 part by mass of sodium hydroxide.

[0100] Preparation process:

[0101] 1. Add 45.5 parts by mass of 46% urea and 3 parts by mass of 60% potassium chloride into a melting tank and heat to melt at a reaction temperature of 115°C to form a eutectic;

[0102] 2. The co-melt in the melting tank overflows into the primary mixing tank, 31 parts by mass of 52% potassium sulfate is added into the primary mixing tank for stirring, the temperature is controlled at 115°C, a mixed treatment product is obtained, and then overflows into the secondary mixing tank.

[0103] 3. Preheat 9.5 parts by mass of sodium humate (the mass ratio of sodium humate to urea is 1:4.79) to 90°C, add it to the secondary mixing tank, keep the temperature at 120°C for 3 minutes, and the slurry has good fluidity; then preheat 10 parts by mass of 73% monoammonium phosphate and 1 part by mass of sodium hydroxide to 90°C, add them to the secondary mixing tank for stirring, control the temperature at 125°C, and obtain a mixed slurry with a pH of about 6, and then spray the mixed slurry from the top of the high tower for granulation;

[0104] 4. The particles obtained by spraying granulation are heat exchanged and dehumidified with the 40°C gas rising from the bottom of the tower, and the moisture content of the particles is reduced to about 0.5%. The granular materials falling into the bottom of the tower are then cooled, screened, coated, and finally packaged with inner ties to obtain 7-46s (22-6-18) high-tower organic-inorganic compound fertilizer products.

[0105] Example 3

[0106] Recipe sheet:

[0107] The raw materials required for high tower organic-inorganic compound fertilizer 7-50s (19-15-16) are: 35.5 parts by mass of 46% urea, 3 parts by mass of 60% potassium chloride, 27 parts by mass of 52% potassium sulfate, 24 parts by mass of 73% monoammonium phosphate, 9 parts by mass of sodium humate, and 1.5 parts by mass of sodium hydroxide.

[0108] Preparation process:

[0109] 1. Add 35.5 parts by mass of 46% urea and 3 parts by mass of 60% potassium chloride into a melting tank and heat to melt at a reaction temperature of 105°C to form a eutectic;

[0110] 2. The co-melt in the melting tank overflows into the primary mixing tank, 27 parts by mass of 52% potassium sulfate is added into the primary mixing tank for stirring, the temperature is controlled at 115°C, a mixed treatment product is obtained, and then overflows into the secondary mixing tank.

[0111] 3. Preheat 9 parts by mass of sodium humate (the mass ratio of sodium humate to urea is 1:3.95) to 70°C, add it to the secondary mixing tank, keep the temperature at 125°C for 3 minutes, and the slurry has good fluidity; preheat 24 parts by mass of 73% monoammonium phosphate and 1.5 parts by mass of sodium hydroxide to 70°C, add them to the secondary mixing tank for stirring, control the temperature at 130°C, and obtain a mixed slurry with a pH of about 6.5, and then spray the mixed slurry from the top of the high tower for granulation;

[0112] 4. The particles obtained by spraying granulation are heat exchanged and dehumidified with the 45°C gas rising from the bottom of the tower, and the moisture content of the particles is reduced to about 0.5%. The granular materials falling into the bottom of the tower are then cooled, screened, coated, and finally packaged with inner ties to obtain 7-50s (19-15-16) high tower organic-inorganic compound fertilizer products.

[0113] Example 4

[0114] The organic-inorganic compound fertilizer product was prepared according to the preparation process described in Example 2, except that the formula was different. The formula table of this example is as follows:

[0115] 36 parts by mass of 46% urea, 3 parts by mass of 60% potassium chloride, 24 parts by mass of 52% potassium sulfate, 24 parts by mass of 73% monoammonium phosphate, 12 parts by mass of sodium humate, and 1 part by mass of sodium hydroxide. The mass ratio of urea to sodium humate is 3:1. The 7-48s (19-15-14) high tower organic-inorganic compound fertilizer product is obtained.

[0116] Example 5

[0117] An organic-inorganic composite fertilizer product was prepared according to the preparation process described in Example 2, except that the sodium humate was not preheated, and monoammonium phosphate, potassium sulfate and sodium hydroxide were not preheated.

[0118] The 7-46s (22-6-18) high tower organic-inorganic compound fertilizer product is obtained.

[0119] Performance Test:

[0120] The inorganic nutrient content, organic nutrient content, phosphorus content and water content of the organic-inorganic compound fertilizer prepared in Examples 1-5 were determined according to GB / T18877-2020. The experimental results are shown in Table 1. The inorganic nutrient content of the organic-inorganic compound fertilizer prepared by the method of the present invention is more than 45%, the organic nutrient content is more than 10%, the phosphorus content is more than 5%, and the water content is less than 1%.

[0121] The organic-inorganic compound fertilizer prepared in Example 1-5 was tested for strength, and the powderization test was carried out at different times of high and low temperature storage (50°C during the day and 25°C at night) to determine the powderization rate, wherein the strength test was carried out using a particle strength tester to measure the particle strength, and the powderization test was carried out using a brittleness meter to measure the powdering rate. Compared with 7-46s (22-6-18) ordinary organic-inorganic compound fertilizer (purchased), the experimental results are shown in Tables 2 and 3, and the particle strength of the organic-inorganic compound fertilizer of the present invention is significantly improved, which is better than the particle strength of 7-46s (22-6-18) ordinary organic-inorganic compound fertilizer; in addition, the powderization rate of the organic-inorganic compound fertilizer of the present invention is also significantly reduced, and at 30 days, its powdering rate is below 5%, while the powdering rate of 7-46s (22-6-18) ordinary organic-inorganic compound fertilizer at 30 days reaches more than 11%.

[0122] Table 1: Content of each substance

[0123] Inorganic nutrient content / % Organic nutrient content / % Phosphorus content / % Water content / % Example 1 48.6 11.45 15.5 0.51 Example 2 46.4 11.77 6.2 0.47 Example 3 50.1 10.78 15.1 0.53 Example 4 48.3 13.92 15.2 0.52 Example 5 46.3 11.69 6.1 0.49

[0124] Table 2: Strength index determination

[0125]

[0126] Table 3: Powdering rate determination

[0127]

[0128] With no fertilizer applied as the control, ordinary organic and inorganic fertilizers (purchased, the inorganic nutrients are the same as those in Example 2) and the fertilizer prepared in Example 2 as the experimental group, a corn field test was carried out in Linyi, Shandong to verify the product effect and determine the apparent utilization rate of nitrogen fertilizer. The application amount of base fertilizer (ordinary organic and inorganic fertilizer or fertilizer prepared in Example 2) between treatments was the same, both 40kg / 667m 2 At the jointing stage, apply urea 15kg / 667m 2 The rest of the field management measures were the same. When harvesting, three points with uniform growth were selected, and 10m 2 Yield was measured; and 10 corn plants with consistent growth were selected. After drying, the nitrogen content of the stalks and grains was measured to calculate the apparent utilization rate of nitrogen fertilizer.

[0129] The results are shown in Tables 4 and 5. Among them, it can be seen from the corn yield results in Table 4 that, compared with ordinary organic and inorganic fertilizers, the application of the high-concentration high-tower organic and inorganic compound fertilizer sample prepared in Example 2 can increase corn yield by more than 10%, and the yield-increasing effect is obvious. From the results of nitrogen apparent utilization rate in Table 5, it can be seen that different fertilizer treatments have little effect on the nitrogen content of corn grains and straw. Compared with ordinary organic and inorganic fertilizers, the aboveground nitrogen absorption of the sample in Example 2 is 2With an increase of 1.05 kg, the apparent nitrogen utilization rate increased from 33.7% to 43.2%, an increase of about 10 percentage points, indicating that the application of the organic and inorganic samples in Example 2 is beneficial to the improvement of the apparent nitrogen fertilizer utilization rate.

[0130] Table 4: Effects of different fertilizer treatments on corn yield

[0131]

[0132] Table 5: Effects of different fertilizer treatments on nitrogen apparent utilization efficiency

[0133]

[0134] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0135] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An organic-inorganic compound fertilizer, characterized in that: include: 20-60 parts by weight of urea, 25-35 parts by weight of potash fertilizer, 10-30 parts by weight of phosphate fertilizer, 5-15 parts by weight of organic material, 1-5 parts by weight of alkaline substance and 0-2 parts by weight of filler.

2. The organic-inorganic compound fertilizer according to claim 1, characterized in that The potash fertilizer includes at least one of potassium chloride, potassium sulfate, potassium nitrate, and potassium dihydrogen phosphate; Optionally, the phosphate fertilizer comprises monoammonium phosphate; Optionally, the organic material includes at least one of lignite, sodium humate, potassium humate, and ammonium humate; Optionally, the alkaline substance includes at least one of sodium hydroxide, potassium hydroxide, and calcium hydroxide; Optionally, the filler includes at least one of dolomite powder, attapulgite, and glauber salt.

3. The organic-inorganic composite fertilizer according to claim 2, characterized in that: The inorganic nutrient content of the organic-inorganic compound fertilizer is not less than 40%, the organic nutrient content is not less than 7%, the phosphorus content is not less than 5%, and the water content is less than 1%.

4. A method for preparing the organic-inorganic composite fertilizer according to any one of claims 1 to 3, characterized in that: include: Melting urea and the first potash fertilizer to obtain a eutectic; Performing a first mixing treatment on the eutectic and a second potash fertilizer to obtain a first mixed treatment product; The first mixed treatment product is reacted with an organic material to obtain a reaction treatment product; The reaction product is subjected to a second mixing treatment with a phosphate fertilizer, an alkaline substance and optionally a filler to obtain a second mixed product; The second mixed treatment product is subjected to spraying and granulation treatment to obtain the organic-inorganic composite fertilizer.

5. The method according to claim 4, characterized in that The mass ratio of the urea to the first potash fertilizer is (20-60):(1-5); Optionally, the first potash fertilizer is potassium chloride; Optionally, the second potash fertilizer is potassium sulfate; Optionally, the temperature of the melt treatment is 90°C-130°C; Optionally, the temperature of the first mixing treatment is 100-130°C; Optionally, the mass ratio of the urea to the organic material in the first mixed treatment product is (3-8):1; Optionally, the reaction treatment temperature is 100°C-135°C; Optionally, the reaction treatment time is 1 min-20 min; Optionally, the temperature of the second mixing treatment is 120°C-135°C; Optionally, the pH value of the second mixed treatment product is 5-7.

5.

6. The method according to claim 5, characterized in that Before the reaction treatment, the method further comprises: performing a first preheating treatment on the organic material; optionally, the temperature of the first preheating treatment is 70° C.-90° C.; Optionally, before the second mixing treatment, the method further comprises: performing a second preheating treatment on the phosphate fertilizer, the alkaline substance and the optional filler; optionally, the temperature of the second preheating treatment is 70° C.-90° C.; Optionally, the spray granulation treatment comprises: spraying the second mixed treatment product from the top of a high tower to the bottom of the tower, wherein the bottom of the tower has rising gas; optionally, the temperature of the gas is 35°C-55°C.

7. A method for increasing crop yield and / or apparent utilization efficiency of nitrogen fertilizer, characterized in that: include: The organic-inorganic compound fertilizer according to any one of claims 1 to 3 or the organic-inorganic compound fertilizer prepared by the method according to any one of claims 4 to 6 is applied to the crop.

8. The method according to claim 7, characterized in that The crop comprises at least one of cotton, Arabidopsis, rice, corn, wheat, sorghum, barley, oats, rye, soybean, tobacco, rapeseed, and tomato.

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