CN110981589A - High-energy sulfur-based fertilizer and preparation method thereof - Google Patents
High-energy sulfur-based fertilizer and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-energy sulfur-based fertilizer and a preparation method thereof. The urea particles are coated with the urea sulfate slow-release film, and the weight part ratio of the urea particles to the urea sulfate slow-release film is 100: 4-6; the urea particles mainly comprise the following raw materials in parts by weight: 30-35 parts of urea, 55-60 parts of ammonium sulfate, 5-7 parts of a fertilizer synergist, 4-6 parts of a long-acting slow release agent, 0.1-0.2 part of sodium octaborate tetrahydrate and 0.1-0.2 part of zinc sulfate heptahydrate; the weight ratio of urea to concentrated sulfuric acid in the urea sulfate slow-release film is 2.5: 1. the product has high strength, quick dissolution and no residue; the nitrogen elements with different forms are reasonably matched, so that the sectional release and absorption of the product after being applied to the soil are facilitated; the long-acting performance of the fertilizer efficiency of the product is ensured, and the utilization rate of the fertilizer is greatly improved.
Description
Technical Field
The invention relates to the field of slow release fertilizers, in particular to a high-energy sulfur-based fertilizer and a preparation method thereof.
Background
China is a big agricultural country, the crop sowing area is more than 1.33 hundred million hectares, the required chemical fertilizer is 1.4 hundred million tons, the future agricultural production still has a dependency trend on the use of chemical fertilizers, and the fertilizer plays an important role in supplementing and balancing soil nutrients and protecting the cultivated land quality. The slow release fertilizer as an environment-friendly fertilizer can effectively control the release speed of nutrients, prolong the fertilizer effect period, improve the utilization rate of the fertilizer to the maximum extent, reduce the nutrient loss, reduce the environmental pollution and reduce the social resource consumption, and has important significance for the sustainable development of agriculture.
Disclosure of Invention
The invention aims to provide a high-energy sulfur-based fertilizer.
In order to achieve the purpose, the invention provides a high-energy sulfur-based fertilizer, which is characterized in that: urea particles are coated with a urea sulfate slow release film, and the weight part ratio of the urea particles to the urea sulfate slow release film is 100: 4-6;
the urea particles mainly comprise the following raw materials in parts by weight: 30-35 parts of urea, 55-60 parts of ammonium sulfate, 5-7 parts of a fertilizer synergist, 4-6 parts of a long-acting slow release agent, 0.1-0.2 part of sodium octaborate tetrahydrate and 0.1-0.2 part of zinc sulfate heptahydrate;
the fertilizer synergist is a polymerized amino acid compound fertilizer;
the long-acting sustained release agent comprises the following components in parts by weight: 160 portions of magnesium sulfate, 320 portions of zeolite powder and 270 portions of bentonite;
the weight ratio of urea to concentrated sulfuric acid in the urea sulfate slow-release film is 2.5: 1.
the polymerized amino acid compound fertilizer mainly comprises the following raw materials in parts by weight: 10-35 parts of synergistic component, 15-50 parts of inorganic nutrient component and 2-8 parts of auxiliary component;
the synergistic component consists of 5-25 parts of compound amino acid and 20-30 parts of polyglutamic acid; the inorganic nutrient components comprise 14-38 parts of bentonite, 0.2-4 parts of attapulgite, 0.3-4 parts of ammonium bicarbonate and 0.5-4 parts of zinc sulfate; the auxiliary component is a mixture of two or more of composite microorganisms mixed by equal weight of monospore bacteria, bacillus subtilis, bacillus circulans, bacillus licheniformis and geotrichum mesophilic fungi.
The preparation method of the compound amino acid comprises the following steps: a. taking frozen and stored fresh pig viscera, unfreezing, cleaning, homogenizing, adding concentrated hydrochloric acid into the slurry, uniformly stirring, then centrifugally separating, removing upper-layer emulsion, and collecting precipitate to obtain precipitate viscera protein; b. drying and crushing the precipitated visceral protein obtained in the step a to obtain dried protein powder, namely placing the precipitated protein obtained in the step a into a drying oven, hermetically heating and drying for 15-20 hours at the temperature of 45-75 ℃, and then crushing to obtain the dried protein powder; c. adding sulfuric acid into the dried protein powder obtained in the previous step for hydrolysis, then diluting, adjusting the pH value to 7-9, and filtering to obtain acid hydrolysate; d. adding activated carbon into the acid hydrolysate obtained by the steps, performing centrifugal separation, collecting supernatant, adjusting the pH value to 2.5-4.5, extracting the supernatant, performing centrifugal separation on the residual precipitate, removing calcium oxalate precipitate, and combining the supernatants to obtain a crude extract; e. loading the crude extract obtained by the above steps on an cation exchange column, washing with water until the pH value is 6.5-7.5, removing residual oxalic acid and calcium ions, eluting with ammonia water, collecting eluate, adding sodium hydroxide, concentrating under reduced pressure to remove ammonia water, adjusting the pH value to 6.6-7.5, and storing at-20 deg.C to obtain a refrigerating fluid; f. naturally thawing the refrigerating fluid obtained by the steps, performing centrifugal separation, collecting supernatant, performing ultrafiltration by using an ultrafiltration membrane, collecting filtrate, and drying to obtain the compound amino acid.
The preparation method of the high-energy sulfur-based fertilizer comprises the following steps:
a. weighing the raw materials for preparing the urea particles according to the amount, uniformly mixing, and placing in a granulator to prepare 1-4 mm urea particles for later use;
b. weighing the raw materials for preparing the urea sulfate slow release film according to the amount, uniformly mixing, placing in a metering pump, spraying urea sulfate on the surface of urea particles, agglomerating into particles of 1-4 mm under the action of centrifugal force, drying, cooling and screening to prepare the urea sulfate coated urea slow release granular fertilizer.
The preparation method of the high-energy sulfur-based fertilizer comprises the following steps:
a. weighing the raw materials for preparing the urea particles according to the amount, uniformly mixing, and placing in a granulator to prepare 1-2 mm urea particles for later use;
b. weighing the raw materials for preparing the urea sulfate slow-release film according to the amount, uniformly mixing, placing in a metering pump, spraying urea sulfate on the surface of urea particles, and agglomerating into particles of 1-2 mm under the action of centrifugal force;
c. spraying a layer of mixed raw material for preparing urea particles on the surfaces of the particles which are agglomerated into 1-2 mm, spraying urea sulfate on the surfaces of the secondary agglomerated urea particles, and agglomerating into particles of 2-4 mm under the action of centrifugal force;
d. spraying a layer of mixed raw material for preparing urea particles on the surfaces of the particles which are agglomerated into 2-4 mm, spraying urea sulfate on the surfaces of the three-time agglomerated urea particles, and agglomerating into particles of 3-4 mm under the action of centrifugal force; and then drying, cooling and screening to prepare the urea sulfate coated urea slow release granular fertilizer.
The structure of the slow release granular fertilizer is that urea granules are taken as cores to be sequentially and alternately coated with urea sulfate slow release films and urea granule raw materials.
The structure of the slow release granular fertilizer is that urea granules are taken as cores to be sequentially and alternately coated with urea sulfate slow release films and urea granule raw materials.
2CO(NH2)2+H2SO4＝2CO(NH2)2·H2SO4
Urea is a high-concentration nitrogen fertilizer, belongs to a neutral quick-acting fertilizer, and can also be used for producing various compound fertilizers. No harmful substance is left in the soil, and no adverse effect is caused after long-term application. Urea is an organic nitrogen fertilizer, and can be absorbed and utilized by crops after being hydrolyzed into ammonium carbonate or ammonium bicarbonate under the action of urease in soil. Therefore, the urea is applied 4-8 days before the fertilizer-requiring period of the crops.
Urea is suitable for use as a base fertilizer and a top dressing, and is sometimes used as a seed fertilizer. The urea is in a molecular state before conversion, cannot be adsorbed by soil and is prevented from losing along with water; the ammonia formed after conversion is also volatile, so the urea is also covered with soil deeply. (A small part of soil converted and applied into soil is dissolved in a soil solution in a molecular state, is absorbed by the soil through hydrogen bond action, and the other most part of soil is hydrolyzed into ammonium carbonate under the action of urease to generate carbonic acid and ammonium hydroxide.
Ammonium sulfate is an excellent nitrogen fertilizer (commonly called as field fertilizing powder), is suitable for general soil and crops, can make branches and leaves grow vigorously, improve fruit quality and yield, enhance the resistance of crops to disasters, can be used as a base fertilizer, an additional fertilizer and a seed fertilizer, and can be subjected to double decomposition reaction with salt to prepare ammonium chloride.
Gamma-polyglutamic acid gamma-PGA can be used as plant yield increasing nutrient
1. Gamma-polyglutamic acid gamma-PGA Hydrogel and gamma-PGA super-strong hydrophilicity and water retention capacity
When the fertilizer is flooded in soil, a layer of film is formed on the surface layer of the plant root hair, so that the fertilizer has the function of protecting the root hair, is an optimal conveying platform for closely contacting nutrients and water in the soil and can effectively improve the dissolution, storage, conveying and absorption of the fertilizer. Prevent sulfate radicals, phosphate radicals and oxalate radicals from generating precipitation with metal elements, so that the crops can absorb phosphorus, calcium, magnesium and trace elements in soil more effectively. Promote the growth of crop root system and strengthen disease resistance.
2. Gamma-polyglutamic acid gamma-PGA Hydrogel and gamma-PGA balance soil pH value
Has excellent buffering capacity on acid and alkali, can effectively balance the acid-base value of soil, and avoids acidic soil caused by long-term use of chemical fertilizers.
3. Gamma-polyglutamic acid gamma-PGA Hydrogel and gamma-PGA can be combined with and precipitate toxic heavy metals
Has excellent chelating effect on toxic heavy metals such As Pb +2, Cu +2, Cd +2, Cr +3, Al +3, As +4 and the like.
4. Gamma-polyglutamic acid gamma-PGA Hydrogel and gamma-PGA can enhance the disease resistance and stress resistance of plants
Integrates plant nutrition and water active components in soil, and can enhance resistance to symptoms caused by soil-borne plant pathogens.
5. Promoting production increase
Can increase the yield of agricultural products such as tea, melons, fruits, vegetables and the like rapidly, and the yield can reach 10 to 20 percent.
The high-energy sulfur-based fertilizer and the preparation method thereof have the beneficial effects that: the product prepared by the method has high strength, quick dissolution and no residue; the content of ammonium nitrogen is 11-12%, the content of amide nitrogen is 19-20%, and nitrogen elements in different forms are reasonably matched, so that sectional release and absorption after the product is applied to soil are facilitated; the digestion inhibitor, the urease inhibitor and the phosphorus activator are reasonably added in the formula, so that the long-acting property of the fertilizer efficiency of the product is ensured, and the utilization rate of the fertilizer is greatly improved; in addition, the added polyamino acid and chelated trace elements play a role in increasing the yield and improving the quality of crops.
Drawings
FIG. 1 is a schematic view of a product of the present invention;
FIG. 2 is a schematic view of the product of the present invention;
in the figure: 1-urea particles and 2-urea sulfate slow release films.
Detailed Description
Example 1
As shown in fig. 1, urea granules are coated with a urea sulfate slow-release film, and the weight ratio of the urea granules to the urea sulfate slow-release film is 100: 4;
the urea particles mainly comprise the following raw materials in parts by weight: 30 parts of urea, 55 parts of ammonium sulfate, 5 parts of a fertilizer synergist, 4 parts of a long-acting slow release agent, 0.1 part of sodium octaborate tetrahydrate and 0.1 part of zinc sulfate heptahydrate;
the fertilizer synergist is a polymerized amino acid compound fertilizer;
the long-acting sustained release agent comprises the following components in parts by weight: 140 parts of magnesium sulfate, 280 parts of zeolite powder and 250 parts of bentonite;
the weight ratio of urea to concentrated sulfuric acid in the urea sulfate slow-release film is 2.5: 1.
the polymerized amino acid compound fertilizer mainly comprises the following raw materials in parts by weight: 10 parts of synergistic component, 15 parts of inorganic nutrient component and 2 parts of auxiliary component; the synergistic component consists of 5 parts of compound amino acid and 30 parts of polyglutamic acid, and the preparation method of the compound amino acid comprises the following steps: a. taking frozen and stored fresh pig viscera, unfreezing, cleaning, homogenizing, adding concentrated hydrochloric acid into the slurry, uniformly stirring, then centrifugally separating, removing upper-layer emulsion, and collecting precipitate to obtain precipitate viscera protein; b. drying and crushing the precipitated visceral protein obtained in the step a to obtain dried protein powder, namely placing the precipitated protein obtained in the step a into a drying oven, hermetically heating and drying for 15-20 hours at the temperature of 45-75 ℃, and then crushing to obtain the dried protein powder; c. adding sulfuric acid into the dried protein powder obtained in the previous step for hydrolysis, then diluting, adjusting the pH value to 7-9, and filtering to obtain acid hydrolysate; d. adding activated carbon into the acid hydrolysate obtained by the steps, performing centrifugal separation, collecting supernatant, adjusting the pH value to 2.5-4.5, extracting the supernatant, performing centrifugal separation on the residual precipitate, removing calcium oxalate precipitate, and combining the supernatants to obtain a crude extract; e. loading the crude extract obtained by the above steps on an cation exchange column, washing with water until the pH value is 6.5-7.5, removing residual oxalic acid and calcium ions, eluting with ammonia water, collecting eluate, adding sodium hydroxide, concentrating under reduced pressure to remove ammonia water, adjusting the pH value to 6.6-7.5, and storing at-20 deg.C to obtain a refrigerating fluid; f. naturally thawing the refrigerating fluid obtained by the steps, performing centrifugal separation, collecting supernatant, performing ultrafiltration by using an ultrafiltration membrane, collecting filtrate, and drying to obtain the compound amino acid; the inorganic nutrient components comprise 14 parts of bentonite, 0.2 part of attapulgite, 0.3 part of ammonium bicarbonate and 0.5 part of zinc sulfate; the auxiliary component is monospore bacteria.
The invention relates to a preparation method of a high-energy sulfur-based fertilizer, which comprises the following steps:
a. weighing the raw materials for preparing the urea granules according to the amount, uniformly mixing, and placing in a granulator to prepare 1mm urea granules for later use;
b. weighing the raw materials for preparing the urea sulfate slow-release film according to the amount, uniformly mixing the raw materials, placing the mixture into a metering pump, spraying urea sulfate onto the surface of urea particles, and agglomerating the urea sulfate into particles with the diameter of 2mm under the action of centrifugal force;
c. spraying a layer of mixed raw material for preparing urea granules on the surface of granules which are agglomerated into 2mm, spraying urea sulfate on the surface of secondary agglomerated urea granules, and agglomerating into 2mm granules under the action of centrifugal force;
d. spraying a layer of mixed raw material for preparing urea granules on the surface of the granules which are agglomerated into 2mm, spraying urea sulfate on the surface of the three-time agglomerated urea granules, and agglomerating into 4mm granules under the action of centrifugal force; and drying, cooling and screening to prepare the urea sulfate coated urea slow release granular fertilizer, wherein the structure of the slow release granular fertilizer is that urea granules are used as cores to coat urea sulfate slow release films.
Example 2
As shown in fig. 1, urea granules are coated with a urea sulfate slow-release film, and the weight ratio of the urea granules to the urea sulfate slow-release film is 100: 5;
the urea particles mainly comprise the following raw materials in parts by weight: 32 parts of urea, 56 parts of ammonium sulfate, 6 parts of a fertilizer synergist, 5 parts of a long-acting slow release agent, 0.15 part of sodium octaborate tetrahydrate and 0.15 part of zinc sulfate heptahydrate;
the fertilizer synergist is a polymerized amino acid compound fertilizer;
the long-acting sustained release agent comprises the following components in parts by weight: 150 parts of magnesium sulfate, 300 parts of zeolite powder and 260 parts of bentonite;
the weight ratio of urea to concentrated sulfuric acid in the urea sulfate slow-release film is 2.5: 1.
the polymerized amino acid compound fertilizer mainly comprises the following raw materials in parts by weight: 20 parts of synergistic component, 15 parts of inorganic nutrient component and 5 parts of auxiliary component; the synergistic component consists of 25 parts of compound amino acid and 20 parts of polyglutamic acid, and the preparation method of the compound amino acid is the same as that of the compound amino acid in the embodiment 1; the inorganic nutrient components comprise 25 parts of bentonite, 3 parts of attapulgite, 2 parts of ammonium bicarbonate and 2 parts of zinc sulfate; the auxiliary component is bacillus subtilis.
The invention relates to a preparation method of a high-energy sulfur-based fertilizer, which comprises the following steps:
a. weighing the raw materials for preparing the urea granules according to the amount, uniformly mixing, and placing in a granulator to prepare 2mm urea granules for later use;
b. weighing the raw materials for preparing the urea sulfate slow-release film according to the amount, uniformly mixing the raw materials, placing the mixture into a metering pump, spraying urea sulfate onto the surface of urea particles, and agglomerating the urea sulfate into particles with the diameter of 2mm under the action of centrifugal force;
c. spraying a layer of mixed raw material for preparing urea granules on the surface of granules which are agglomerated into 2mm, spraying urea sulfate on the surface of secondary agglomerated urea granules, and agglomerating into granules with the diameter of 4mm under the action of centrifugal force;
d. spraying a layer of mixed raw material for preparing urea granules on the surfaces of the granules which are agglomerated into 4mm, spraying urea sulfate on the surfaces of the three-time agglomerated urea granules, and agglomerating into 4mm granules under the action of centrifugal force; and drying, cooling and screening to prepare the urea sulfate coated urea slow release granular fertilizer, wherein the structure of the slow release granular fertilizer is that urea granules are taken as cores to be sequentially and alternately coated with urea sulfate slow release films and urea granule raw materials.
Example 3
As shown in fig. 1, urea granules are coated with a urea sulfate slow-release film, and the weight ratio of the urea granules to the urea sulfate slow-release film is 100: 6;
the urea particles mainly comprise the following raw materials in parts by weight: 35 parts of urea, 60 parts of ammonium sulfate, 7 parts of a fertilizer synergist, 6 parts of a long-acting slow release agent, 0.2 part of sodium octaborate tetrahydrate and 0.2 part of zinc sulfate heptahydrate;
the fertilizer synergist is a polymerized amino acid compound fertilizer;
the long-acting sustained release agent comprises the following components in parts by weight: 160 parts of magnesium sulfate, 320 parts of zeolite powder and 270 parts of bentonite;
the weight ratio of urea to concentrated sulfuric acid in the urea sulfate slow-release film is 2.5: 1.
the polymerized amino acid compound fertilizer mainly comprises the following raw materials in parts by weight: 35 parts of synergistic component, 50 parts of inorganic nutrient component and 8 parts of auxiliary component; the synergistic component consists of 10 parts of compound amino acid and 25 parts of polyglutamic acid, and the preparation method of the compound amino acid is the same as that of the compound amino acid in the embodiment 1; the inorganic nutrient components comprise 38 parts of bentonite, 4 parts of attapulgite, 4 parts of ammonium bicarbonate and 4 parts of zinc sulfate; the auxiliary component is a mixture of two or more of composite microorganisms mixed by equal weight of monospore bacteria, bacillus subtilis, bacillus circulans, bacillus licheniformis and geotrichum mesophilic fungi.
The invention relates to a preparation method of a high-energy sulfur-based fertilizer, which comprises the following steps:
a. weighing the raw materials for preparing the urea granules according to the amount, uniformly mixing, and placing in a granulator to prepare 2mm urea granules for later use;
b. weighing the raw materials for preparing the urea sulfate slow-release film according to the amount, uniformly mixing the raw materials, placing the mixture into a metering pump, spraying urea sulfate onto the surface of urea particles, and agglomerating the urea sulfate into particles with the diameter of 2mm under the action of centrifugal force;
c. spraying a layer of mixed raw material for preparing urea granules on the surface of granules which are agglomerated into 2mm, spraying urea sulfate on the surface of secondary agglomerated urea granules, and agglomerating into granules with the diameter of 4mm under the action of centrifugal force;
d. spraying a layer of mixed raw material for preparing urea granules on the surfaces of the granules which are agglomerated into 4mm, spraying urea sulfate on the surfaces of the three-time agglomerated urea granules, and agglomerating into 4mm granules under the action of centrifugal force; and then drying, cooling and screening to prepare the urea sulfate coated urea slow release granular fertilizer.
Example 4
As shown in fig. 2, urea granules are coated with a urea sulfate slow-release film, and the weight ratio of the urea granules to the urea sulfate slow-release film is 100: 4;
the urea particles mainly comprise the following raw materials in parts by weight: 35 parts of urea, 60 parts of ammonium sulfate, 7 parts of a fertilizer synergist, 6 parts of a long-acting slow release agent, 0.2 part of sodium octaborate tetrahydrate and 0.2 part of zinc sulfate heptahydrate;
the fertilizer synergist is a polymerized amino acid compound fertilizer;
the long-acting sustained release agent comprises the following components in parts by weight: 160 parts of magnesium sulfate, 320 parts of zeolite powder and 270 parts of bentonite;
the weight ratio of urea to concentrated sulfuric acid in the urea sulfate slow-release film is 2.5: 1.
the polymerized amino acid compound fertilizer mainly comprises the following raw materials in parts by weight: 10 parts of synergistic component, 15 parts of inorganic nutrient component and 2 parts of auxiliary component; the synergistic component consists of 15 parts of compound amino acid and 20 parts of polyglutamic acid, and the preparation method of the compound amino acid is the same as that of the compound amino acid in the embodiment 1; the inorganic nutrient components comprise 14 parts of bentonite, 0.2 part of attapulgite, 0.3 part of ammonium bicarbonate and 0.5 part of zinc sulfate; the auxiliary component is monospore bacteria.
The invention relates to a preparation method of a high-energy sulfur-based fertilizer, which comprises the following steps:
a. weighing the raw materials for preparing the urea granules according to the amount, uniformly mixing, and placing in a granulator to prepare 1mm urea granules for later use;
b. weighing the raw materials for preparing the urea sulfate slow-release film according to the amount, uniformly mixing, placing in a metering pump, spraying urea sulfate on the surface of urea particles, and under the action of centrifugal force, agglomerating into particles with the diameter of 2mm and cutting at 1/3-1/2;
c. spraying a layer of mixed raw material for preparing urea particles on the surfaces of the cut particles, spraying urea sulfate on the surfaces of the secondary agglomerated urea particles, agglomerating the urea sulfate into particles with the size of 2mm under the action of centrifugal force, and cutting the particles at 1/3-1/2;
d. spraying a layer of mixed raw material for preparing urea granules on the surface of the cut granules, spraying urea sulfate on the surface of the tertiary agglomerated urea granules, and agglomerating the urea sulfate into 4mm granules under the action of centrifugal force; and drying, cooling and screening to obtain the urea sulfate coated urea slow release granular fertilizer, wherein the structure of the slow release granular fertilizer is that urea granules are taken as cores to be sequentially and alternately coated with urea sulfate slow release films and urea granule raw materials in half.
Example 5
As shown in fig. 2, urea granules are coated with a urea sulfate slow-release film, and the weight ratio of the urea granules to the urea sulfate slow-release film is 100: 6;
the urea particles mainly comprise the following raw materials in parts by weight: 30 parts of urea, 60 parts of ammonium sulfate, 5 parts of a fertilizer synergist, 6 parts of a long-acting slow release agent, 0.1 part of sodium octaborate tetrahydrate and 0.2 part of zinc sulfate heptahydrate;
the fertilizer synergist is a polymerized amino acid compound fertilizer;
the long-acting sustained release agent comprises the following components in parts by weight: 140 parts of magnesium sulfate, 320 parts of zeolite powder and 250 parts of bentonite;
the weight ratio of urea to concentrated sulfuric acid in the urea sulfate slow-release film is 2.5: 1.
the polymerized amino acid compound fertilizer mainly comprises the following raw materials in parts by weight: 20 parts of synergistic component, 15 parts of inorganic nutrient component and 5 parts of auxiliary component; the synergistic component consists of 20 parts of compound amino acid and 25 parts of polyglutamic acid, and the preparation method of the compound amino acid is the same as that of the compound amino acid in the embodiment 1; the inorganic nutrient components comprise 25 parts of bentonite, 3 parts of attapulgite, 2 parts of ammonium bicarbonate and 2 parts of zinc sulfate; the auxiliary component is bacillus subtilis.
The invention relates to a preparation method of a high-energy sulfur-based fertilizer, which comprises the following steps:
a. weighing the raw materials for preparing the urea granules according to the amount, uniformly mixing, and placing in a granulator to prepare 2mm urea granules for later use;
b. weighing the raw materials for preparing the urea sulfate slow-release film according to the amount, uniformly mixing, placing in a metering pump, spraying urea sulfate on the surface of urea particles, and under the action of centrifugal force, agglomerating into particles with the diameter of 2mm and cutting at 1/3-1/2;
c. spraying a layer of mixed raw material for preparing urea particles on the surfaces of the cut particles, spraying urea sulfate on the surfaces of the secondary agglomerated urea particles, agglomerating the urea sulfate into particles with the diameter of 4mm under the action of centrifugal force, and cutting the particles at 1/3-1/2;
d. spraying a layer of mixed raw material for preparing urea granules on the surface of the cut granules, spraying urea sulfate on the surface of the tertiary agglomerated urea granules, and agglomerating the urea sulfate into 4mm granules under the action of centrifugal force; and then drying, cooling and screening to prepare the urea sulfate coated urea slow release granular fertilizer.
Claims (6)
1. A high-energy sulfur-based fertilizer is characterized in that: urea particles are coated with a urea sulfate slow release film, and the weight part ratio of the urea particles to the urea sulfate slow release film is 100: 4-6;
the urea particles mainly comprise the following raw materials in parts by weight: 30-35 parts of urea, 55-60 parts of ammonium sulfate, 5-7 parts of a fertilizer synergist, 4-6 parts of a long-acting slow release agent, 0.1-0.2 part of sodium octaborate tetrahydrate and 0.1-0.2 part of zinc sulfate heptahydrate;
the fertilizer synergist is a polymerized amino acid compound fertilizer;
the long-acting sustained release agent comprises the following components in parts by weight: 160 portions of magnesium sulfate, 320 portions of zeolite powder and 270 portions of bentonite;
the weight ratio of urea to concentrated sulfuric acid in the urea sulfate slow-release film is 2.5: 1.
2. the high-energy sulfur-based fertilizer as claimed in claim 1, wherein:
the polymerized amino acid compound fertilizer mainly comprises the following raw materials in parts by weight: 10-35 parts of synergistic component, 15-50 parts of inorganic nutrient component and 2-8 parts of auxiliary component;
the synergistic component consists of 5-25 parts of compound amino acid and 20-30 parts of polyglutamic acid;
the inorganic nutrient components comprise 14-38 parts of bentonite, 0.2-4 parts of attapulgite, 0.3-4 parts of ammonium bicarbonate and 0.5-4 parts of zinc sulfate; the auxiliary component is a mixture of two or more of composite microorganisms mixed by equal weight of monospore bacteria, bacillus subtilis, bacillus circulans, bacillus licheniformis and geotrichum mesophilic fungi.
3. The high-energy sulfur-based fertilizer as claimed in claim 1, wherein: the preparation method of the compound amino acid comprises the following steps: a. taking frozen and stored fresh pig viscera, unfreezing, cleaning, homogenizing, adding concentrated hydrochloric acid into the slurry, uniformly stirring, then centrifugally separating, removing upper-layer emulsion, and collecting precipitate to obtain precipitate viscera protein; b. drying and crushing the precipitated visceral protein obtained in the step a to obtain dried protein powder, namely placing the precipitated protein obtained in the step a into a drying oven, hermetically heating and drying for 15-20 hours at the temperature of 45-75 ℃, and then crushing to obtain the dried protein powder; c. adding sulfuric acid into the dried protein powder obtained in the previous step for hydrolysis, then diluting, adjusting the pH value to 7-9, and filtering to obtain acid hydrolysate; d. adding activated carbon into the acid hydrolysate obtained by the steps, performing centrifugal separation, collecting supernatant, adjusting the pH value to 2.5-4.5, extracting the supernatant, performing centrifugal separation on the residual precipitate, removing calcium oxalate precipitate, and combining the supernatants to obtain a crude extract; e. loading the crude extract obtained by the above steps on an cation exchange column, washing with water until the pH value is 6.5-7.5, removing residual oxalic acid and calcium ions, eluting with ammonia water, collecting eluate, adding sodium hydroxide, concentrating under reduced pressure to remove ammonia water, adjusting the pH value to 6.6-7.5, and storing at-20 deg.C to obtain a refrigerating fluid; f. naturally thawing the refrigerating fluid obtained by the steps, performing centrifugal separation, collecting supernatant, performing ultrafiltration by using an ultrafiltration membrane, collecting filtrate, and drying to obtain the compound amino acid.
4. The method for preparing the high-energy sulfur-based fertilizer as claimed in claim 1, wherein the method comprises the following steps:
a. weighing the raw materials for preparing the urea particles according to the amount, uniformly mixing, and placing in a granulator to prepare 1-4 mm urea particles for later use;
b. weighing the raw materials for preparing the urea sulfate slow release film according to the amount, uniformly mixing, placing in a metering pump, spraying urea sulfate on the surface of urea particles, agglomerating into particles of 1-4 mm under the action of centrifugal force, drying, cooling and screening to prepare the urea sulfate coated urea slow release granular fertilizer.
5. The method for preparing the high-energy sulfur-based fertilizer as claimed in claim 1, wherein the method comprises the following steps:
a. weighing the raw materials for preparing the urea particles according to the amount, uniformly mixing, and placing in a granulator to prepare 1-2 mm urea particles for later use;
b. weighing the raw materials for preparing the urea sulfate slow-release film according to the amount, uniformly mixing, placing in a metering pump, spraying urea sulfate on the surface of urea particles, and agglomerating into particles of 1-2 mm under the action of centrifugal force;
c. spraying a layer of mixed raw material for preparing urea particles on the surfaces of the particles which are agglomerated into 1-2 mm, spraying urea sulfate on the surfaces of the secondary agglomerated urea particles, and agglomerating into particles of 2-4 mm under the action of centrifugal force;
d. spraying a layer of mixed raw material for preparing urea particles on the surfaces of the particles which are agglomerated into 2-4 mm, spraying urea sulfate on the surfaces of the three-time agglomerated urea particles, and agglomerating into particles of 3-4 mm under the action of centrifugal force; and then drying, cooling and screening to prepare the urea sulfate coated urea slow release granular fertilizer.
6. The high-energy sulfur-based fertilizer according to claim 9, wherein: the structure of the slow release granular fertilizer is that urea granules are taken as cores to be sequentially and alternately coated with urea sulfate slow release films and urea granule raw materials.
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| CN114181021A (en) * | 2021-12-23 | 2022-03-15 | 安徽辉隆集团五禾生态肥业有限公司 | Potassium fulvate type compound fertilizer containing medium and trace metal elements and preparation process thereof |
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Application publication date: 20200410 |