Preparation method of slow-release vitamin B3 waste liquid fertilizer

Abstract

The invention relates to the technical field of fertilizers, and particularly discloses a preparation method of a slow-release vitamin B3 waste liquid fertilizer, which comprises the following steps: filtering and neutralizing a vitamin B3 waste liquid, adding a base material additive into the vitamin B3 waste liquid, and stirring and mixing to obtain a waste liquid base material; the preparation method comprises the following steps: adding a waste liquid base material into a stirrer, dropwise adding isobutylidene diurea and polyacrylamide at the same time, dropwise adding a controlled release agent into the waste liquid base material, standing and cooling to room temperature to obtain a fertilizer base material; adding deionized water into the fertilizer base material, and heating the fertilizer base material to obtain a granulation base material; the granulation base material is placed in granulation equipment for granulation, and the coating agent is sprayed to the granulation surface to obtain the fertilizer granules, so that the release rate of the fertilizer base material is reduced, the action duration of the fertilizer on crops is prolonged, and meanwhile, the fertilizer cannot quickly absorb water when just applied to wet soil; quick release of the fertilizer is avoided, and the acting time of the fertilizer is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizers, and in particular to a method for preparing a slow-release vitamin B3 waste liquid fertilizer. Background Art

[0002] In the process of synthesizing vitamin B3 or its related compounds (such as nicotinamide, 3-cyanopyridine, etc.), wastewater containing vitamin B3 may be generated. These wastewaters usually contain unreacted raw materials, intermediates, solvents, catalysts and other chemicals produced by the reaction; in addition, pharmaceutical plants, chemical plants or feed additive plants may also generate wastewater containing vitamin B3 when producing vitamin B3 products.

[0003] When the vitamin B3 waste liquid is recycled, the vitamin B3 waste liquid can be used as a basic material for fertilizer preparation, which avoids the waste of the vitamin B3 waste liquid on the one hand and saves the processing cost on the other hand; However, after the vitamin B3 waste liquid is prepared as fertilizer, it is used as basic fertilizer, the fertilizer effect time is short and the fertilizer effect is poor. Summary of the invention

[0004] The object of the present invention is to provide a method for preparing a slow-release vitamin B3 waste liquid fertilizer to solve the above-mentioned background problems.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A method for preparing a slow-release vitamin B3 waste liquid fertilizer comprises the following steps: Step 1: filtering and neutralizing the vitamin B3 waste liquid, and then adding a base material additive to the vitamin B3 waste liquid and stirring and mixing to obtain a waste liquid base material; Step 2: adding isobutylene diurea and polyacrylamide to the waste liquid base material at the same time, maintaining a stirring speed of 150-200 r / min for uniform stirring during the dropping process, maintaining water bath heating during the stirring process, and after heating in the water bath for 4 hours, adding a controlled release agent to the waste liquid base material, while maintaining uniform stirring and water bath heating, and after heating in the water bath for 4-6 hours, standing and cooling to room temperature to obtain a fertilizer base material; Step 3: Add deionized water at 25-30°C to the fertilizer base material, maintain a stirring speed of 60-120r / min during the addition process, and heat the fertilizer base material to 55-58°C to obtain a granulation base material; Step 4: placing the granulation base material in a granulation device for granulation, controlling the temperature of the fertilizer base material to be 55-58° C. during the granulation process, and spraying a coating agent on the granulation surface to obtain fertilizer granules.

[0006] As a further solution of the present invention: in the step 1, the specific steps of preparing the waste liquid base material include the following steps: A1: Filter the vitamin B3 waste liquid through a filtering device, test the pH value of the filtered vitamin B3 waste liquid, and neutralize the vitamin B3, including: If the vitamin B3 waste liquid is acidic, an alkaline neutralizing agent is added to the vitamin B3 waste liquid; If the vitamin B3 waste liquid is alkaline, an acidic neutralizing agent is added to the vitamin B3 waste liquid; A2: After the vitamin B3 waste liquid is neutralized, the vitamin B3 waste liquid is heated to 52-57°C, and a chelating agent is added to the waste liquid, left to stand for 2-3 hours, and then cooled to room temperature; A3: Add an activating agent, urea, calcium phosphate and potassium chloride in sequence to the vitamin B3 waste liquid cooled to room temperature, and keep the temperature of the vitamin B3 waste liquid below 60° C. during the addition process to obtain a waste liquid base material.

[0007] As a further solution of the present invention: the weight ratio of the vitamin B3 waste liquid, the active agent, urea, calcium phosphate and potassium chloride in A3 is 1:0.2-0.5:3-4:1.4-1.7:0.9-1.1.

[0008] As a further solution of the present invention: the alkaline neutralizer in A1 is one of lime, sodium hydroxide and sodium carbonate; The acidic neutralizing agent is one of sulfuric acid and hydrochloric acid.

[0009] As a further solution of the present invention: the active agent in A3 is one of stearic acid, oleic acid, lauric acid and lecithin.

[0010] As a further solution of the present invention: the controlled release agent in step 2 is obtained by mixing 3,4-dimethyl-1H-pyrazole dihydrogen phosphate and N-butylthiophosphoric triamide in a ratio of 1:1.5-3.

[0011] As a further solution of the present invention: the coating agent in step 4 is one of polyethylene, polypropylene, polyvinyl chloride, polystyrene and polyurethane.

[0012] As a further solution of the present invention: in the step 2, the ratio of the waste liquid base material, isobutylene diurea and polyacrylamide is 1:0.08-0.085:0.01-0.02.

[0013] As a further solution of the present invention: in the step 2, the ratio of the waste liquid base material to the controlled release agent is 1:0.01-0.03.

[0014] As a further solution of the present invention: in step three, the ratio of the fertilizer base material to the deionized water is 1:0.03-0.05.

[0015] Beneficial effects of the present invention: In the process of preparing fertilizer, polyacrylamide and isobutylene diurea are added and dissolved with urea, which can reduce the solubility of the fertilizer when the soil moisture is high during use, increase the action time of the fertilizer, and at the same time, increase the soil granular structure, reduce the soil dissolution rate of the fertilizer, and increase the release time of the fertilizer; At the same time, during the preparation of the fertilizer, a controlled release agent prepared from 3,4-dimethyl-1H-pyrazole dihydrogen phosphate and N-butylthiophosphoric triamide is added to further reduce the release rate of the fertilizer base material and increase the duration of the fertilizer's effect on crops; Finally, during the granulation process of the fertilizer, the surface of the fertilizer particles is coated so that the fertilizer will not absorb water too quickly when it is first applied to the moist soil, thus avoiding the rapid release of the fertilizer and increasing the duration of the fertilizer's action. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the preparation method of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Embodiment 1 The present invention is a method for preparing a slow-release vitamin B3 waste liquid fertilizer, comprising the following steps: Step 1: Filter the vitamin B3 waste liquid through a filtering device, test the pH value of the filtered vitamin B3 waste liquid, and neutralize the vitamin B3, including: If the vitamin B3 waste liquid is acidic, an alkaline neutralizer is added to the vitamin B3 waste liquid, wherein the alkaline neutralizer is lime; If the vitamin B3 waste liquid is alkaline, an acidic neutralizing agent is added to the vitamin B3 waste liquid, wherein the acidic neutralizing agent is sulfuric acid; After the vitamin B3 waste liquid is neutralized, the vitamin B3 waste liquid is heated to 52° C., a chelating agent is added to the waste liquid, the waste liquid is allowed to stand for 2 hours, and then cooled to room temperature; Adding an active agent, urea, calcium phosphate and potassium chloride in sequence to the vitamin B3 waste liquid cooled to room temperature, keeping the temperature of the vitamin B3 waste liquid below 60° C. during the addition process, to obtain a waste liquid base material, wherein the active agent is stearic acid; The weight ratio of vitamin B3 waste liquid, active agent, urea, calcium phosphate and potassium chloride is 1:0.2:3:1.4:0.9; Step 2: simultaneously adding isobutylene diurea and polyacrylamide to the waste liquid base material, the ratio of the waste liquid base material, isobutylene diurea and polyacrylamide is 1:0.08:0.01, maintaining a stirring speed of 150r / min for uniform stirring during the dropping process, maintaining water bath heating during the stirring process, and after heating in the water bath for 4 hours, adding a controlled release agent to the waste liquid base material, the ratio of the waste liquid base material to the controlled release agent is 1:0.01, maintaining uniform stirring and water bath heating at the same time, and then heating in the water bath for 4 hours, standing and cooling to room temperature to obtain a fertilizer base material; wherein the controlled release agent is 3,4-dimethyl-1H-pyrazole dihydrogen phosphate and N-butylthiophosphoric triamide mixed in a ratio of 1:1.5; Step 3: Add 25°C deionized water to the fertilizer base material, the ratio of the fertilizer base material to the deionized water being 1:0.03; during the adding process, maintain a stirring speed of 60r / min, and heat the fertilizer base material to 55°C to obtain a granulation base material; Step 4: placing the granulation base material in a granulation device for granulation, controlling the temperature of the fertilizer base material to be 55° C. during the granulation process, and spraying a coating agent on the granulation surface to obtain fertilizer particles, wherein the coating agent is polyethylene.

[0020] Embodiment 2 The present invention is a method for preparing a slow-release vitamin B3 waste liquid fertilizer, comprising the following steps: Step 1: Filter the vitamin B3 waste liquid through a filtering device, test the pH value of the filtered vitamin B3 waste liquid, and neutralize the vitamin B3, including: If the vitamin B3 waste liquid is acidic, an alkaline neutralizer is added to the vitamin B3 waste liquid, wherein the alkaline neutralizer is sodium hydroxide; If the vitamin B3 waste liquid is alkaline, an acidic neutralizing agent is added to the vitamin B3 waste liquid, wherein the acidic neutralizing agent is sulfuric acid; After the vitamin B3 waste liquid is neutralized, the vitamin B3 waste liquid is heated to 54.5° C., a chelating agent is added to the waste liquid, the waste liquid is allowed to stand for 2.5 hours, and then cooled to room temperature; Adding an active agent, urea, calcium phosphate and potassium chloride in sequence to the vitamin B3 waste liquid cooled to room temperature, keeping the temperature of the vitamin B3 waste liquid below 60° C. during the addition process, to obtain a waste liquid base material, wherein the active agent is oleic acid; The weight ratio of vitamin B3 waste liquid, active agent, urea, calcium phosphate and potassium chloride is 1:0.35:3.5:1.55:0.1; Step 2: simultaneously adding isobutylene diurea and polyacrylamide to the waste liquid base material, the ratio of the waste liquid base material, isobutylene diurea and polyacrylamide is 1:0.0825:0.015, maintaining a stirring speed of 175r / min for uniform stirring during the dropping process, maintaining water bath heating during the stirring process, and after heating in the water bath for 4 hours, adding a controlled release agent to the waste liquid base material, the ratio of the waste liquid base material to the controlled release agent is 1:0.02, maintaining uniform stirring and water bath heating at the same time, and then heating in the water bath for 5 hours, standing and cooling to room temperature to obtain a fertilizer base material; wherein the controlled release agent is 3,4-dimethyl-1H-pyrazole dihydrogen phosphate and N-butylthiophosphoric triamide mixed in a ratio of 1:1.75; Step 3: Add deionized water at 27.5°C to the fertilizer base material, with the ratio of the fertilizer base material to the deionized water being 1:0.04; during the adding process, maintain a stirring speed of 90r / min, and heat the fertilizer base material to 56.5°C to obtain a granulation base material; Step 4: placing the granulation base material in a granulation device for granulation, controlling the temperature of the fertilizer base material to be 56.5° C. during the granulation process, and spraying a coating agent on the granulation surface to obtain fertilizer particles, wherein the coating agent is polypropylene.

[0021] Embodiment 3 The present invention is a method for preparing a slow-release vitamin B3 waste liquid fertilizer, comprising the following steps: Step 1: Filter the vitamin B3 waste liquid through a filtering device, test the pH value of the filtered vitamin B3 waste liquid, and neutralize the vitamin B3, including: If the vitamin B3 waste liquid is acidic, an alkaline neutralizer is added to the vitamin B3 waste liquid, wherein the alkaline neutralizer is sodium carbonate; If the vitamin B3 waste liquid is alkaline, an acidic neutralizer is added to the vitamin B3 waste liquid, wherein the acidic neutralizer is hydrochloric acid; After the vitamin B3 waste liquid is neutralized, the vitamin B3 waste liquid is heated to 57° C., a chelating agent is added to the waste liquid, the waste liquid is allowed to stand for 3 hours, and then cooled to room temperature; Adding an active agent, urea, calcium phosphate and potassium chloride in sequence to the vitamin B3 waste liquid cooled to room temperature, keeping the temperature of the vitamin B3 waste liquid below 60° C. during the addition process, to obtain a waste liquid base material, wherein the active agent is lecithin; The weight ratio of vitamin B3 waste liquid, active agent, urea, calcium phosphate and potassium chloride is 1:0.5:4:1.7:1.1; Step 2: Add isobutylene diurea and polyacrylamide to the waste liquid base material at the same time, the ratio of the waste liquid base material, isobutylene diurea and polyacrylamide is 1:0.085:0.02, maintain a stirring speed of 200r / min for uniform stirring during the dropping process, keep water bath heating during the stirring process, after heating in the water bath for 4 hours, add a controlled release agent to the waste liquid base material, the ratio of the waste liquid base material to the controlled release agent is 1:0.03, keep uniform stirring and water bath heating at the same time, and after heating in the water bath for 6 hours, let it stand and cool to room temperature to obtain a fertilizer base material; wherein the controlled release agent is 3,4-dimethyl-1H-pyrazole dihydrogen phosphate and N-butyl thiophosphoric triamide mixed in a ratio of 1:3; Step 3: Add 30° C. deionized water to the fertilizer base material, with the ratio of the fertilizer base material to the deionized water being 1:0.05; during the adding process, maintain a stirring speed of 120 r / min, and heat the fertilizer base material to 58° C. to obtain a granulation base material; Step 4: placing the granulation base material in a granulation device for granulation, controlling the temperature of the fertilizer base material to be 58° C. during the granulation process, and spraying a coating agent on the granulation surface to obtain fertilizer particles, wherein the coating agent is polyurethane.

[0022] In the process of preparing fertilizer, polyacrylamide and isobutylene diurea are added and dissolved with urea, which can reduce the solubility of the fertilizer when the soil moisture is high during use, increase the action time of the fertilizer, and at the same time, increase the soil granular structure, reduce the soil dissolution rate of the fertilizer, and increase the release time of the fertilizer; At the same time, during the preparation of the fertilizer, a controlled release agent prepared from 3,4-dimethyl-1H-pyrazole dihydrogen phosphate and N-butylthiophosphoric triamide is added to further reduce the release rate of the fertilizer base material and increase the duration of the fertilizer's effect on crops; Finally, during the granulation process of the fertilizer, the surface of the fertilizer particles is coated so that the fertilizer will not absorb water too quickly when it is first applied to the moist soil, thus avoiding the rapid release of the fertilizer and increasing the duration of the fertilizer's action.

[0023] Comparative Example 1 A method for preparing a slow-release vitamin B3 waste liquid fertilizer comprises the following steps: Step 1: Filter the vitamin B3 waste liquid through a filtering device, test the pH value of the filtered vitamin B3 waste liquid, and neutralize the vitamin B3, including: If the vitamin B3 waste liquid is acidic, an alkaline neutralizer is added to the vitamin B3 waste liquid, wherein the alkaline neutralizer is lime; If the vitamin B3 waste liquid is alkaline, an acidic neutralizing agent is added to the vitamin B3 waste liquid, wherein the acidic neutralizing agent is sulfuric acid; After the vitamin B3 waste liquid is neutralized, the vitamin B3 waste liquid is heated to 52° C., a chelating agent is added to the waste liquid, the waste liquid is allowed to stand for 2 hours, and then cooled to room temperature; Adding an active agent, urea, calcium phosphate and potassium chloride in sequence to the vitamin B3 waste liquid cooled to room temperature, keeping the temperature of the vitamin B3 waste liquid below 60° C. during the addition process, to obtain a waste liquid base material, wherein the active agent is stearic acid; The weight ratio of vitamin B3 waste liquid, active agent, urea, calcium phosphate and potassium chloride is 1:0.2:3:1.4:0.9; Step 2: The waste liquid base material is stirred at a stirring speed of 150 r / min, and water bath heating is maintained during the stirring process. After heating in the water bath for 4 hours, a controlled release agent is added dropwise to the waste liquid base material, and the ratio of the waste liquid base material to the controlled release agent is 1:0.01. At the same time, uniform stirring and water bath heating are maintained. After heating in the water bath for 4 hours, the controlled release agent is allowed to stand and cool to room temperature to obtain a fertilizer base material; wherein the controlled release agent is obtained by mixing 3,4-dimethyl-1H-pyrazole dihydrogen phosphate and N-butylthiophosphoric triamide in a ratio of 1:1.5; Step 3: Add 25°C deionized water to the fertilizer base material, the ratio of the fertilizer base material to the deionized water being 1:0.03; during the adding process, maintain a stirring speed of 60r / min, and heat the fertilizer base material to 55°C to obtain a granulation base material; Step 4: placing the granulation base material in a granulation device for granulation, controlling the temperature of the fertilizer base material to be 55° C. during the granulation process, and spraying a coating agent on the granulation surface to obtain fertilizer particles, wherein the coating agent is polyethylene.

[0024] Comparative Example 2 A method for preparing a slow-release vitamin B3 waste liquid fertilizer comprises the following steps: Step 1: Filter the vitamin B3 waste liquid through a filtering device, test the pH value of the filtered vitamin B3 waste liquid, and neutralize the vitamin B3, including: If the vitamin B3 waste liquid is acidic, an alkaline neutralizer is added to the vitamin B3 waste liquid, wherein the alkaline neutralizer is lime; If the vitamin B3 waste liquid is alkaline, an acidic neutralizing agent is added to the vitamin B3 waste liquid, wherein the acidic neutralizing agent is sulfuric acid; After the vitamin B3 waste liquid is neutralized, the vitamin B3 waste liquid is heated to 52° C., a chelating agent is added to the waste liquid, the waste liquid is allowed to stand for 2 hours, and then cooled to room temperature; Adding an active agent, urea, calcium phosphate and potassium chloride in sequence to the vitamin B3 waste liquid cooled to room temperature, keeping the temperature of the vitamin B3 waste liquid below 60° C. during the addition process, to obtain a waste liquid base material, wherein the active agent is stearic acid; The weight ratio of vitamin B3 waste liquid, active agent, urea, calcium phosphate and potassium chloride is 1:0.2:3:1.4:0.9; Step 2: simultaneously adding isobutylene diurea and polyacrylamide to the waste liquid base material, the ratio of the waste liquid base material, isobutylene diurea and polyacrylamide is 1:0.08:0.01, maintaining a stirring speed of 150r / min for uniform stirring during the dropping process, maintaining water bath heating during the stirring process, and after heating in the water bath for 4 hours, adding a controlled release agent to the waste liquid base material, the ratio of the waste liquid base material to the controlled release agent is 1:0.01, maintaining uniform stirring and water bath heating at the same time, and then heating in the water bath for 4 hours, standing and cooling to room temperature to obtain a fertilizer base material; wherein the controlled release agent is 3,4-dimethyl-1H-pyrazole dihydrogen phosphate and N-butylthiophosphoric triamide mixed in a ratio of 1:1.5; Step 3: Add 25°C deionized water to the fertilizer base material, the ratio of the fertilizer base material to the deionized water being 1:0.03; during the adding process, maintain a stirring speed of 60r / min, and heat the fertilizer base material to 55°C to obtain a granulation base material; Step 4: placing the granulation base material in a granulation device for granulation to obtain fertilizer granules.

[0025] Comparative Example 3 A method for preparing a slow-release vitamin B3 waste liquid fertilizer comprises the following steps: Step 1: Filter the vitamin B3 waste liquid through a filtering device, test the pH value of the filtered vitamin B3 waste liquid, and neutralize the vitamin B3, including: If the vitamin B3 waste liquid is acidic, an alkaline neutralizer is added to the vitamin B3 waste liquid, wherein the alkaline neutralizer is lime; If the vitamin B3 waste liquid is alkaline, an acidic neutralizing agent is added to the vitamin B3 waste liquid, wherein the acidic neutralizing agent is sulfuric acid; After the vitamin B3 waste liquid is neutralized, the vitamin B3 waste liquid is heated to 52° C., a chelating agent is added to the waste liquid, the waste liquid is allowed to stand for 2 hours, and then cooled to room temperature; Adding an active agent, urea, calcium phosphate and potassium chloride in sequence to the vitamin B3 waste liquid cooled to room temperature, keeping the temperature of the vitamin B3 waste liquid below 60° C. during the addition process, to obtain a waste liquid base material, wherein the active agent is stearic acid; The weight ratio of vitamin B3 waste liquid, active agent, urea, calcium phosphate and potassium chloride is 1:0.2:3:1.4:0.9; Step 2: adding isobutylene diurea and polyacrylamide to the waste liquid base material at the same time, wherein the ratio of the waste liquid base material, isobutylene diurea and polyacrylamide is 1:0.08:0.01, maintaining a stirring speed of 150 r / min for uniform stirring during the dropping process, maintaining water bath heating during the stirring process, and then heating in the water bath for 4 hours, standing and cooling to room temperature to obtain a fertilizer base material; wherein the controlled release agent is obtained by mixing 3,4-dimethyl-1H-pyrazole dihydrogen phosphate and N-butylthiophosphoric triamide in a ratio of 1:1.5; Step 3: Add 25°C deionized water to the fertilizer base material, the ratio of the fertilizer base material to the deionized water being 1:0.03; during the adding process, maintain a stirring speed of 60r / min, and heat the fertilizer base material to 55°C to obtain a granulation base material; Step 4: placing the granulation base material in a granulation device for granulation, controlling the temperature of the fertilizer base material to be 55° C. during the granulation process, and spraying a coating agent on the granulation surface to obtain fertilizer particles, wherein the coating agent is polyethylene.

[0026] Comparative Example 4 A method for preparing a slow-release vitamin B3 waste liquid fertilizer comprises the following steps: Step 1: Filter the vitamin B3 waste liquid through a filtering device, test the pH value of the filtered vitamin B3 waste liquid, and neutralize the vitamin B3, including: If the vitamin B3 waste liquid is acidic, an alkaline neutralizer is added to the vitamin B3 waste liquid, wherein the alkaline neutralizer is lime; If the vitamin B3 waste liquid is alkaline, an acidic neutralizing agent is added to the vitamin B3 waste liquid, wherein the acidic neutralizing agent is sulfuric acid; After the vitamin B3 waste liquid is neutralized, the vitamin B3 waste liquid is heated to 52° C., a chelating agent is added to the waste liquid, the waste liquid is allowed to stand for 2 hours, and then cooled to room temperature; Adding an active agent, urea, calcium phosphate and potassium chloride in sequence to the vitamin B3 waste liquid cooled to room temperature, keeping the temperature of the vitamin B3 waste liquid below 60° C. during the addition process, to obtain a waste liquid base material, wherein the active agent is stearic acid; The weight ratio of vitamin B3 waste liquid, active agent, urea, calcium phosphate and potassium chloride is 1:0.2:3:1.4:0.9; Step 2: Stir the waste liquid base material at a stirring speed of 150 r / min at a uniform speed, keep heating in a water bath during the stirring process, and after heating in the water bath for 8 hours, cool it to room temperature to obtain a fertilizer base material; Step 3: Add 25°C deionized water to the fertilizer base material, the ratio of the fertilizer base material to the deionized water being 1:0.03; during the adding process, maintain a stirring speed of 60r / min, and heat the fertilizer base material to 55°C to obtain a granulation base material; Step 4: placing the granulation base material in a granulation device for granulation to obtain fertilizer granules.

[0027] Based on the above-mentioned embodiments and comparative examples, a slow-release fertilizer was prepared. In order to more intuitively illustrate the effect of the slow-release fertilizer obtained in the embodiment of the present invention, test fields with the same planting conditions, including the same soil moisture and soil temperature, were selected respectively, and a slow-release fertilizer with the same initial particle diameter of 0.4 cm was applied. At the same time, a test field under the same conditions was selected, and the slow-release fertilizer prepared in Comparative Examples 1-4 was applied. The fertilizer diameter of the slow-release fertilizer under the same action time and the same plant was measured; the following table is shown:

[0028] Based on the comparative data of Comparative Example 1 and the embodiment, it can be seen that when the fertilizer is used in combination with polyacrylamide and isobutylene diurea, it can be used as a soil conditioner to increase the soil aggregate structure and increase the slow release time; Based on the comparison data between Comparative Example 2 and the embodiment, it can be seen that after adding the coating agent, the action time of the fertilizer can be effectively increased; Based on the comparison data between Comparative Example 3 and the embodiment, it can be seen that in the preparation process of the granulation base material, adding a controlled release agent can reduce the release rate of the fertilizer during the action process; Comparative Example 4 does not include the addition of polyacrylamide, isobutylene diurea, controlled release agent and coating agent in the examples. It can be seen intuitively that the action time of the fertilizer is significantly shortened. In summary, the present application can effectively increase the action time of the fertilizer, improve the absorption time of crops, and increase the yield of crops after adding polyacrylamide, isobutylene diurea, a controlled release agent, and a coating agent.

[0029] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for preparing a slow-release vitamin B3 waste liquid fertilizer, characterized in that: The following steps are involved: Step 1: filtering and neutralizing the vitamin B3 waste liquid, and then adding a base material additive to the vitamin B3 waste liquid and stirring and mixing to obtain a waste liquid base material; Step 2: adding isobutylene diurea and polyacrylamide to the waste liquid base material at the same time, maintaining a stirring speed of 150-200 r / min for uniform stirring during the dropping process, maintaining water bath heating during the stirring process, and after heating in the water bath for 4 hours, adding a controlled release agent to the waste liquid base material, while maintaining uniform stirring and water bath heating, and after heating in the water bath for 4-6 hours, standing and cooling to room temperature to obtain a fertilizer base material; Step 3: Add deionized water at 25-30°C to the fertilizer base material, maintain a stirring speed of 60-120r / min during the addition process, and heat the fertilizer base material to 55-58°C to obtain a granulation base material; Step 4: placing the granulation base material in a granulation device for granulation, controlling the temperature of the fertilizer base material to be 55-58° C. during the granulation process, and spraying a coating agent on the granulation surface to obtain fertilizer granules.

2. The method for preparing a slow-release vitamin B3 waste liquid fertilizer according to claim 1, characterized in that: In the step 1, the specific steps of preparing the waste liquid base material include the following steps: A1: Filter the vitamin B3 waste liquid through a filtering device, test the pH value of the filtered vitamin B3 waste liquid, and neutralize the vitamin B3, including: If the vitamin B3 waste liquid is acidic, an alkaline neutralizing agent is added to the vitamin B3 waste liquid; If the vitamin B3 waste liquid is alkaline, an acidic neutralizing agent is added to the vitamin B3 waste liquid; A2: After the vitamin B3 waste liquid is neutralized, the vitamin B3 waste liquid is heated to 52-57°C, and a chelating agent is added to the waste liquid, left to stand for 2-3 hours, and then cooled to room temperature; A3: Add an activating agent, urea, calcium phosphate and potassium chloride in sequence to the vitamin B3 waste liquid cooled to room temperature, and keep the temperature of the vitamin B3 waste liquid below 60° C. during the addition process to obtain a waste liquid base material.

3. The method for preparing a slow-release vitamin B3 waste liquid fertilizer according to claim 2, characterized in that: The weight ratio of the vitamin B3 waste liquid, the active agent, urea, calcium phosphate and potassium chloride in A3 is 1:0.2-0.5:3-4:1.4-1.7:0.9-1.

1.

4. The method for preparing a slow-release vitamin B3 waste liquid fertilizer according to claim 2, characterized in that: The alkaline neutralizing agent in A1 is one of lime, sodium hydroxide and sodium carbonate; The acidic neutralizing agent is one of sulfuric acid and hydrochloric acid.

5. The method for preparing a slow-release vitamin B3 waste liquid fertilizer according to claim 2, characterized in that: The active agent in A3 is one of stearic acid, oleic acid, lauric acid and lecithin.

6. The method for preparing a slow-release vitamin B3 waste liquid fertilizer according to claim 1, characterized in that: The controlled release agent in step 2 is obtained by mixing 3,4-dimethyl-1H-pyrazole dihydrogen phosphate and N-butylthiophosphoric triamide in a ratio of 1:1.5-3.

7. The method for preparing a slow-release vitamin B3 waste liquid fertilizer according to claim 1, characterized in that: The coating agent in step 4 is one of polyethylene, polypropylene, polyvinyl chloride, polystyrene and polyurethane.

8. The method for preparing a slow-release vitamin B3 waste liquid fertilizer according to claim 6, characterized in that: In the step 2, the ratio of the waste liquid base material, isobutylene diurea and polyacrylamide is 1:0.08-0.085:0.01-0.

02.

9. The method for preparing a slow-release vitamin B3 waste liquid fertilizer according to claim 8, characterized in that: In the step 2, the ratio of the waste liquid base material to the controlled release agent is 1:0.01-0.

03.

10. The method for preparing a slow-release vitamin B3 waste liquid fertilizer according to claim 1, characterized in that: In the step three, the ratio of the fertilizer base material to the deionized water is 1:0.03-0.05.

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