Composite suspending agent and method for producing liquid water-soluble fertilizer and preventing sedimentation and layering

Abstract

The invention belongs to the field of fertilizer production, and particularly relates to a composite suspending agent and an anti-sedimentation layering method for producing a liquid water-soluble fertilizer.The method comprises the steps that modified ammonium nitrate, urea, a nitrogen-potassium fertilizer, monoammonium phosphate and a potassium fertilizer are put into water and stirred to be dissolved at the temperature of 40-50 DEG C, and a mother solution A is obtained; and S2, adding organic matters, medium trace elements selected and added according to a formula and a synergist into the mother liquor A in the step S1, and uniformly stirring and mixing at the temperature of 40-50 DEG C. The xanthan gum and the nano silicon material have the basic effects of preventing sedimentation, resisting layering, dispersing, suspending and stabilizing a system; after the two components are compounded, a remarkable synergistic effect can be generated. Specifically, the three-dimensional physical network structure of the nano silicon material can be intertwined with the linear polymer chain of xanthan gum to form a unique'rigid framework + flexible network 'composite structure, and the structure not only can enhance the suspension capacity of the system, but also can effectively optimize the rheological property.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of fertilizer production, in particular to a composite suspending agent and a method for preventing the settlement and stratification of liquid water-soluble fertilizer in production. BACKGROUND

[0002] As a high-tech and high-value quick-acting fertilizer, liquid water-soluble fertilizer has the characteristics of comprehensive nutrient elements, good water solubility, no residue, etc., and can be completely dissolved in water and directly absorbed and utilized by crop roots and foliage. Through water and fertilizer application, water and fertilizer integration is achieved, and the effective absorption rate is more than one time higher than that of ordinary chemical fertilizers, the fertilizer effect is fast, and the nutrient demand of high-yield crops in the rapid growth period can be met. It also has the characteristics of easy compounding, low production cost, green and low consumption. Enterprises can adapt to the characteristics of different crops and apply corresponding fertilizers in fields, orchards, greenhouse vegetables, etc. It can not only promote yield increase, but also reduce labor, water and other inputs, and has economic and social benefits. With the popularization of water and fertilizer integration technology, the application range of water-soluble fertilizer is continuously expanding, the industry development trend is good, and it is supported at the policy level. After the production and product registration is changed to the record system, the development is more vigorous.

[0003] However, the current liquid water-soluble fertilizer industry faces many problems: On the one hand, the quality of liquid water-soluble fertilizer products on the market is uneven, and there is a lack of detailed standards for product uniformity. Under high temperature or normal temperature conditions, many products are prone to settlement and stratification, which affects the user experience and restricts the development of high-concentration liquid water-soluble fertilizer; On the other hand, the existing methods at home and abroad have defects in solving the settlement and stratification problem of liquid fertilizer. European and American countries mainly use the method of adding colloidal clay minerals such as bentonite and white clay, which can control the viscosity of the suspension, but when applied to high-concentration liquid fertilizer compound fertilizer, the fertilizer is placed for a short time (≤15 days), and is prone to stratification and solidification when placed for a long time. Some domestic methods add high-viscosity and high-molecular-weight cellulose substances, which have high cost and poor effect, and the active clay added in the composite method is not soluble in water, which can easily cause pipe blockage of drip irrigation, aerial application and other facility agriculture equipment. In addition, "fish eyes" are easily formed during the addition of the suspending agent, which are not evenly dispersed, and a spreading machine and a high-speed emulsifying machine need to be equipped, which increases the difficulty and investment cost of liquid fertilizer preparation.

[0004] Therefore, the present application provides a composite suspending agent and a method for preventing the settlement and stratification of liquid water-soluble fertilizer in production. SUMMARY

[0005] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background art.

[0006] The technical solution adopted by this invention to solve its technical problem is: a composite suspending agent and a method for preventing sedimentation and stratification in the production of liquid water-soluble fertilizer, the method comprising the following steps: S1. Add modified ammonium nitrate, urea, nitrogen and potassium fertilizer, monoammonium phosphate, and potassium fertilizer to water and stir to dissolve at a temperature of 40~50℃ to obtain mother liquor A; S2. Add the organic matter, trace elements and synergists selected according to the formula to the mother liquor A in step S1, and stir and mix evenly at a temperature of 40~50℃ to prepare mixed organic mother liquor B. S3. Add the composite suspending agent to the mixed organic mother liquor B from step S2, and stir and mix evenly at a temperature ≤45℃ to form liquid fertilizer mother liquor C. The weight of the composite suspending agent accounts for 0.4%~2.0% of the total material mass. The total material includes nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, water, organic matter, trace elements, and synergists. The composite suspending agent is composed of nano-silica material, xanthan gum, and acidic nitrogen-phosphorus-potassium material mixed evenly. The mass ratio of xanthan gum, nano-silica material, and acidic nitrogen-phosphorus-potassium material is 2~5:2~5:5~16. The acidic nitrogen-phosphorus-potassium material includes substances containing one or more of nitrogen, phosphorus, and potassium elements, with a fineness of 40~80 mesh, and the surface area of ​​the nano-silica material is ≥200m² / g. S4. The liquid fertilizer mother liquor C from step S3 is circulated and emulsified using a three-stage emulsification pump, while a shearing machine is used for submerged shearing. The rotation speeds of the emulsification pump and the shearing machine are 2500~3500 rpm and 1200~1800 rpm, respectively, for 20~60 minutes, forming a suspended liquid fertilizer.

[0007] Preferably, the mass ratio of xanthan gum, nano-silica material, and acidic nitrogen, phosphorus, and potassium materials in the composite suspending agent is 3:3:6.

[0008] Preferably, the weight ratio of the composite suspending agent to the total material mass is 1.0%.

[0009] Preferably, in step S4, the emulsification pump speed is 2950 rpm and the shearing machine speed is 1450 rpm.

[0010] Preferably, the emulsification and shearing time in step S4 is 30 minutes.

[0011] Preferably, the temperature is controlled at 45°C in steps S1 and S2.

[0012] Preferably, the temperature is controlled at 40°C in steps S3 and S4.

[0013] Preferably, the viscosity of the organic liquid fertilizer in step S4 is 400~950 mPa•s.

[0014] Preferably, the acidic nitrogen-phosphorus-potassium feedstock is a composite material containing nitrogen, phosphorus, and potassium elements, with a fineness of 60 mesh.

[0015] Preferably, the surface area of ​​the nano-silicon material is 200 m² / g.

[0016] The beneficial effects of this invention are as follows: 1. The present invention discloses a composite suspending agent and a method for preventing sedimentation and stratification in the production of liquid water-soluble fertilizers. This invention utilizes the inherent properties of xanthan gum and nano-silica materials, both of which possess the basic functions of preventing sedimentation, resisting stratification, and dispersing, suspending, and stabilizing the system. The combination of the two produces a significant synergistic effect. Specifically, the three-dimensional physical network structure of the nano-silica materials intertwines with the linear polymer chains of xanthan gum, forming a unique "rigid skeleton + flexible network" composite structure. This structure not only enhances the suspension capacity of the system but also effectively optimizes its rheological properties. When this composite structure is combined with acidic nitrogen, phosphorus, and potassium materials to form a composite suspending agent, it achieves a synergistic physical effect, more effectively preventing particle sedimentation in organic liquid fertilizers compared to a single suspending agent, thus significantly improving the suspension effect. Actual verification shows that after six months of standing, the effective substance content in the upper and lower layers of the suspended liquid fertilizer remains consistent, and no stratification is visually observed. This fully demonstrates its excellent suspension stability, maintaining the homogeneity and stability of the system over a long period, providing a reliable guarantee for the storage, transportation, and use of organic liquid fertilizers.

[0017] 2. The composite suspending agent and method for preventing sedimentation and stratification in the production of liquid water-soluble fertilizers described in this invention are fully water-soluble and contain an acidic nitrogen, phosphorus, and potassium dispersant, which allows the suspending agent to be more easily dispersed in the solution during the preparation and addition of organic liquid fertilizers. No complex operating procedures or special equipment are required; the addition method is simple, and it can be uniformly mixed with other raw materials, greatly reducing the difficulty of operation and improving production efficiency.

[0018] 3. The composite suspending agent and the method for preventing sedimentation and stratification in the production of liquid water-soluble fertilizer described in this invention have the following advantages: First, the raw material composition and preparation process of the composite suspending agent have been optimized, which reduces the raw material cost while ensuring good suspension effect. Second, due to its easy dispersion and uniform addition characteristics, it reduces the waste of raw materials caused by uneven mixing and the rework costs that may be required later, thus comprehensively reducing the production cost of organic liquid fertilizer.

[0019] 4. The composite suspending agent and method for preventing sedimentation and stratification in the production of liquid water-soluble fertilizers described in this invention involve shearing and emulsification operations at specific speeds during the liquid fertilizer preparation process. The emulsification pump speed is controlled at 2500-3500 rpm, the shearing machine speed is 1200-1800 rpm, and the time is 20-60 minutes. This series of operations further improves the uniformity, dispersibility, and stability of the suspension system, ensuring uniform distribution of components in the liquid fertilizer and avoiding local concentration differences. Simultaneously, it guarantees the consistency of product viscosity, making the organic liquid fertilizer more stable and reliable during storage and use, providing quality assurance for agricultural production. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] An embodiment of the present invention provides a composite suspending agent and a method for preventing sedimentation and stratification in the production of liquid water-soluble fertilizers. The method includes the following steps: S1. Add modified ammonium nitrate, urea, nitrogen and potassium fertilizer, monoammonium phosphate, and potassium fertilizer to water and stir to dissolve at a temperature of 40~50℃ to obtain mother liquor A; S2. Add the organic matter, trace elements and synergists selected according to the formula to the mother liquor A in step S1, and stir and mix evenly at a temperature of 40~50℃ to prepare mixed organic mother liquor B. S3. Add the composite suspending agent to the mixed organic mother liquor B from step S2, and stir and mix evenly at a temperature ≤45℃ to form liquid fertilizer mother liquor C. The weight of the composite suspending agent accounts for 0.4%~2.0% of the total material mass. The total material includes nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, water, organic matter, trace elements, and synergists. The composite suspending agent is composed of nano-silica material, xanthan gum, and acidic nitrogen-phosphorus-potassium material mixed evenly. The mass ratio of xanthan gum, nano-silica material, and acidic nitrogen-phosphorus-potassium material is 2~5:2~5:5~16. The acidic nitrogen-phosphorus-potassium material includes substances containing one or more of nitrogen, phosphorus, and potassium elements, with a fineness of 40~80 mesh, and the surface area of ​​the nano-silica material is ≥200m² / g. S4. The liquid fertilizer mother liquor C from step S3 is circulated and emulsified using a three-stage emulsification pump, while a shearing machine is used for submerged shearing. The rotation speeds of the emulsification pump and the shearing machine are 2500~3500 rpm and 1200~1800 rpm, respectively, for 20~60 minutes, forming a suspended liquid fertilizer.

[0022] The mass ratio of xanthan gum, nano-silica material, and acidic nitrogen, phosphorus, and potassium materials in the composite suspension is 3:3:6.

[0023] The weight ratio of the composite suspending agent to the total material mass is 1.0%.

[0024] In step S4, the emulsification pump speed is 2950 rpm and the shearing machine speed is 1450 rpm.

[0025] The emulsification and shearing time in step S4 is 30 minutes.

[0026] The temperature is controlled at 45℃ in steps S1 and S2.

[0027] In steps S3 and S4, the temperature is controlled at 40℃.

[0028] The viscosity of the organic liquid fertilizer in step S4 is 400~950 mPa•s.

[0029] Acidic nitrogen-phosphorus-potassium feedstock is a composite material containing nitrogen, phosphorus, and potassium elements, with a fineness of 60 mesh.

[0030] The surface area of ​​the nano-silicon material is 200 m² / g.

[0031] Working principle: As shown in Table 1 below: Raw materials Modified ammonium nitrate phosphorus Urea Nitrogen potassium fertilizer Industrial monoammonium phosphate Potassium chloride Zinc sulfate heptahydrate Sodium octaborate tetrahydrate Proportion 30% 11.4% 2.6% 3.7% 2.4% 0.2% 0.2% Raw materials Potassium fulvate Synergist Xanthan gum Nano silicon material Acidic nitrogen phosphorus potassium material Water Proportion 10% 0.2% 0.30% 0.30% 0.7% 38.0% Table 1 shows the names and proportions of the raw materials.

[0032] Specific operation: Add water to the reaction vessel, control the stirrer speed to 38~60 revolutions, heat to a constant temperature of 40~50℃, and then slowly add modified ammonium nitrate, urea, nitrogen and potassium fertilizer, industrial monoammonium phosphate and potassium chloride into the water in sequence, and stir at a constant temperature to dissolve. Then add zinc sulfate heptahydrate, sodium octaborate tetrahydrate, and synergists to the above solution and keep the temperature constant at 40~50℃; Then, control the temperature to ≤45℃, slowly add potassium humate to the solution, and mix and stir evenly; Finally, the nano-silicon material and xanthan gum are mixed in proportion and then thoroughly mixed with acidic nitrogen, phosphorus and potassium materials crushed to about 60 mesh to form a composite suspending agent. This suspending agent is then slowly added to the above solution and stirred until evenly mixed. After shearing and three-stage emulsification for 30 minutes, a stable suspended organic liquid water-soluble agent is formed.

[0033] After standing for 6 months, comparative testing showed no difference in the content of effective substances in the upper and lower layers, and no stratification was observed.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite suspending agent and a method for preventing sedimentation and stratification in the production of liquid water-soluble fertilizer, characterized in that, The method includes the following steps: S1. Add modified ammonium nitrate, urea, nitrogen and potassium fertilizer, monoammonium phosphate, and potassium fertilizer to water and stir to dissolve at a temperature of 40~50℃ to obtain mother liquor A; S2. Add the organic matter, trace elements and synergists selected according to the formula to the mother liquor A in step S1, and stir and mix evenly at a temperature of 40~50℃ to prepare mixed organic mother liquor B. S3. Add the composite suspending agent to the mixed organic mother liquor B from step S2, and stir and mix evenly at a temperature ≤45℃ to form liquid fertilizer mother liquor C. The weight of the composite suspending agent accounts for 0.4%~2.0% of the total material mass. The total material includes nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer, water, organic matter, trace elements, and synergists. The composite suspending agent is composed of nano-silica material, xanthan gum, and acidic nitrogen-phosphorus-potassium material mixed evenly. The mass ratio of xanthan gum, nano-silica material, and acidic nitrogen-phosphorus-potassium material is 2~5:2~5:5~16. The acidic nitrogen-phosphorus-potassium material includes substances containing one or more of nitrogen, phosphorus, and potassium elements, with a fineness of 40~80 mesh. The surface area of ​​the nano-silica material is ≥200m² / g. S4. The liquid fertilizer mother liquor C from step S3 is circulated and emulsified using a three-stage emulsification pump, while a shearing machine is used for submerged shearing. The rotation speeds of the emulsification pump and the shearing machine are 2500~3500 rpm and 1200~1800 rpm, respectively, for 20~60 minutes, forming a suspended liquid fertilizer.

2. The composite suspending agent and the method for preventing sedimentation and stratification in the production of liquid water-soluble fertilizer according to claim 1, characterized in that: The mass ratio of xanthan gum, nano-silica material, and acidic nitrogen, phosphorus, and potassium materials in the composite suspending agent is 3:3:

6.

3. The composite suspending agent and the method for preventing sedimentation and stratification in the production of liquid water-soluble fertilizer according to claim 1, characterized in that: The weight of the composite suspending agent accounts for 1.0% of the total material mass.

4. The composite suspending agent and the method for preventing sedimentation and stratification in the production of liquid water-soluble fertilizer according to claim 1, characterized in that: In step S4, the emulsification pump speed is 2950 rpm and the shearing machine speed is 1450 rpm.

5. The composite suspending agent and the method for preventing sedimentation and stratification in the production of liquid water-soluble fertilizer according to claim 1, characterized in that: The emulsification and shearing time in step S4 is 30 minutes.

6. The composite suspending agent and the method for preventing sedimentation and stratification in the production of liquid water-soluble fertilizer according to claim 1, characterized in that: The temperature is controlled at 45℃ in steps S1 and S2.

7. The composite suspending agent and the method for preventing sedimentation and stratification in the production of liquid water-soluble fertilizer according to claim 1, characterized in that: In steps S3 and S4, the temperature is controlled at 40℃.

8. The composite suspending agent and the method for preventing sedimentation and stratification in the production of liquid water-soluble fertilizer according to claim 1, characterized in that: The viscosity of the organic liquid fertilizer mentioned in step S4 is 400~950 mPa•s.

9. The composite suspending agent and the method for preventing sedimentation and stratification in the production of liquid water-soluble fertilizer according to claim 1, characterized in that: The acidic nitrogen-phosphorus-potassium material is a composite substance containing nitrogen, phosphorus, and potassium elements, with a fineness of 60 mesh.

10. The composite suspending agent and the method for preventing sedimentation and stratification in the production of liquid water-soluble fertilizer according to claim 1, characterized in that: The surface area of ​​the nano-silicon material is 200 m² / g.