CN113860966A - Compound fertilizer containing humic acid and preparation method thereof - Google Patents
Compound fertilizer containing humic acid and preparation method thereof Download PDFInfo
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- CN113860966A CN113860966A CN202111299063.8A CN202111299063A CN113860966A CN 113860966 A CN113860966 A CN 113860966A CN 202111299063 A CN202111299063 A CN 202111299063A CN 113860966 A CN113860966 A CN 113860966A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G5/00—Fertilisers characterised by their form
- C05G5/10—Solid or semi-solid fertilisers, e.g. powders
- C05G5/12—Granules or flakes
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Abstract
The invention provides a compound fertilizer containing humic acid and a preparation method thereof, and the preparation method comprises the following steps: (1) mixing urea and a potash fertilizer and heating to melt to obtain nitrogen-potassium molten liquid; (2) mixing and heating a phosphate fertilizer, humic acid and the nitrogen potassium molten liquid to obtain a first-stage mixed liquid; (3) mixing and heating organic matters, a synergist, a potassium fertilizer, a phosphorus-potassium fertilizer and humic acid with the primary mixed solution to obtain a secondary mixed solution; (4) and granulating the secondary mixed solution to obtain the compound fertilizer containing humic acid. According to the invention, through the matching use and the batch addition of the raw materials, the problems of bubbles and overflowing generated after the humic acid and the nitrogen potassium melt are mixed are effectively solved, the water content of the product is reduced to less than 3%, the problem that the content of the humic acid in the product cannot be increased when a compound fertilizer is produced by a high-tower process is solved, and the process difficulty is reduced.
Description
Technical Field
The invention relates to the field of fertilizer production, and particularly relates to a compound fertilizer containing humic acid and a preparation method thereof.
Background
The high tower process is one of the production modes of the humic acid-containing compound fertilizer, and generally adopts the steps of mixing and melting all raw materials of the compound fertilizer at high temperature, spraying the mixed and melted liquid drops, and cooling and solidifying the sprayed liquid drops through air to form particles. Compared with the conventional process for producing the humic acid-containing compound fertilizer, the high tower process has the advantages of stable production, small influence of the external environment, high productivity, low manufacturing energy consumption, cleaner production environment and environmental protection, and compared with the product produced by the conventional process, the product produced by the high tower process has more uniform nutrition, higher particle strength, high dissolution speed, brightness, smoothness and more storage and transportation resistance. However, the humic acid content in the humic acid-containing compound fertilizer produced by the high tower process is usually less than 15%, the humic acid-containing compound fertilizer does not meet the production standard of the humic acid-containing compound fertilizer, and the theoretical effect of the humic acid-containing compound fertilizer cannot be achieved, and the problem is caused because a series of problems occur in the process of producing the humic acid-containing compound fertilizer by the high tower process, and the specific reasons are as follows:
(1) the temperature of the primary tank is generally above 120 ℃, even reaches 170 ℃, and a series of problems of carbonization, decomposition, denaturation, reaction, peculiar smell and the like of raw materials often occur when the raw materials containing organic matters and humic acid are put into the primary tank;
(2) when the content of humic acid is high, the viscosity of the whole slurry of the compound fertilizer is poor and insufficient, so that granulation cannot be carried out when the content of humic acid is high, and the content of humic acid in the product cannot be increased;
(3) humic acid and organic matter are not easy to be heated to a high temperature (more than 110 ℃) in the production process of the compound fertilizer, the slurry of the compound fertilizer is easy to generate the problems of foaming and bubbling when the temperature is higher, and the humic acid and the molten slurry in the melting tank are easy to generate the problems of bubbles and bubbling after being mixed;
(4) the humic acid-containing compound fertilizer has the advantages of large water content, more foaming, lower strength, unstable product storage and transportation process, and easy pulverization and hardening.
Disclosure of Invention
The invention aims to provide a preparation method of a compound fertilizer containing humic acid, which effectively solves the problems of bubbles and bubbling after mixing the humic acid and a nitrogen-potassium melt liquid by matching and adding raw materials in batches, reduces the water content of a product to be less than 3 percent, solves the problem that the content of the humic acid in the product cannot be increased when the compound fertilizer is produced by a high-tower process, and reduces the process difficulty. The compound fertilizer produced by the method has the advantages of higher humic acid content, high strength, low water content, stability in the process of storage and transportation, and avoidance of pulverization and hardening.
The invention is realized by the following steps:
a preparation method of a compound fertilizer containing humic acid comprises the following steps:
(1) mixing urea and a potash fertilizer and heating to melt to obtain nitrogen-potassium molten liquid;
(2) mixing and heating a phosphate fertilizer, humic acid and the nitrogen-potassium molten liquid obtained in the step (1) to obtain a first-stage mixed liquid;
(3) mixing and heating organic matters, a synergist, a potassium fertilizer, a phosphorus-potassium fertilizer and humic acid with the primary mixed solution obtained in the step (2) to obtain a secondary mixed solution;
(4) and (4) granulating the secondary mixed liquid obtained in the step (3) to obtain the compound fertilizer containing humic acid.
The invention aims to provide a preparation method of a compound fertilizer containing humic acid, which effectively solves the problems of bubbles and bubbling after mixing the humic acid and a nitrogen-potassium melt liquid by matching and adding raw materials in batches, reduces the water content of a product to be less than 3 percent, solves the problem that the content of the humic acid in the product cannot be increased when the compound fertilizer is produced by a high-tower process, and reduces the process difficulty. The compound fertilizer produced by the method has the advantages of higher humic acid content, high strength, low water content, stability in the process of storage and transportation, and avoidance of pulverization and hardening.
In the prior art, urea, potash fertilizer, ammonium phosphate, humic acid and organic matters are generally adopted to produce the fertilizer in the production process, but due to the large water content in the humic acid and the organic matters, the slurry is thin, the viscosity is reduced, and the granulation is difficult. The phosphorus-potassium fertilizer is added in the step (3), so that the viscosity of the slurry is effectively improved, the granulation stability is obviously improved, and the problem of difficult granulation is solved.
The heating temperature in the step (1) is 120-125 ℃.
In the step (1), the weight part of the urea is 30-50 parts;
preferably, the mass ratio of the urea to the potash fertilizer is (10-15): 1. The urea and the potash fertilizer in the proportion are melted together, so that the melting temperature of the urea is reduced.
The total weight of the potash fertilizer in the step (1) and the step (3) is 5-20 parts;
preferably, the potash fertilizer in the step (3) is the residual potash fertilizer in the step (1);
preferably, the potash fertilizer is potassium chloride or potassium sulfate.
The heating temperature in the step (2) is 95-105 ℃.
The temperature is controlled to be 95-105 ℃, so that the first-stage mixed liquid is ensured to have good fluidity, and the problems of carbonization, decomposition, denaturation, reaction, peculiar smell and the like caused by high temperature of humic acid are effectively avoided. In addition, the internal moisture of the humic acid is evaporated at the temperature of 95-105 ℃ by feeding the humic acid in batches, so that the water content in the product is reduced, and the product strength is improved.
In the step (2), 1-20 parts by weight of the phosphate fertilizer is added;
preferably, the phosphate fertilizer is ammonium phosphate.
The total weight of the humic acid in the step (2) and the step (3) is 10-55 parts;
preferably, in the step (2), the weight of the humic acid is less than 50% of the total weight of all the raw materials in the steps (1) to (3);
preferably, the humic acid in the step (3) is the remaining humic acid in the step (2);
according to the invention, the humic acid is fed in batches, so that the problems of thinning and poor viscosity of the mixed solution and no granulation in product production caused by overlarge feeding amount during one-time feeding of the humic acid are prevented, and the mixing state of the raw materials in the step (3) is effectively improved.
Preferably, the humic acid is carbon-containing humic acid.
The heating temperature in the step (3) is 85-100 ℃.
0-10 parts of organic matter, 0-1 part of synergist and 5-15 parts of phosphorus-potassium fertilizer;
preferably, the organic matter comprises potassium humate, cellulose and decomposed animal and plant residues;
preferably, the synergist is a synergist containing any one or more of zinc, boron, manganese, iron, calcium or magnesium.
In the step (4), the granulation frequency is 33-40 Hz, and the aperture of the spray basket in the granulation is 2.6-2.8 mm;
preferably, in the step (4), the method further comprises the steps of cooling, screening and spraying anti-caking oil after granulation;
preferably, the mass ratio of the anti-caking oil to the humic acid-containing compound fertilizer is 0.5-1.3 per mill. The compound fertilizer containing humic acid only needs to spray a small amount of anti-caking oil, and does not need to add anti-caking powder additionally.
A preparation method of a compound fertilizer containing humic acid specifically comprises the following steps:
(1) the mass ratio is (10-15): 1, putting the urea and the potash fertilizer into a melting tank with the temperature of 120-125 ℃ through a belt conveyor, a metering scale and a bucket elevator to obtain nitrogen-potassium molten liquid;
(2) when the nitrogen-potassium melt overflows from the melting tank to a primary tank, putting a phosphate fertilizer and humic acid accounting for less than 50% of the total weight of the raw materials into the primary tank at the temperature of 95-105 ℃ through a vibrating screen, a weighing scale, a belt conveyor and a bucket elevator, and mixing the phosphate fertilizer and the humic acid with the nitrogen-potassium melt to obtain primary mixed liquid;
(3) when the primary mixed solution overflows from the primary tank to a secondary tank, putting organic matters, a synergist, the residual potash fertilizer and the residual phosphorus-potassium fertilizer in the step (1) and the residual humic acid in the step (2) into the secondary tank at the temperature of 85-100 ℃ through a vibrating screen, a weighing scale, a belt conveyor and a bucket elevator, and mixing the secondary mixed solution with the primary mixed solution to obtain a secondary mixed solution;
(4) overflowing the secondary mixed liquid from the secondary tank into a special granulator for a high tower, granulating at the frequency of 33-40 Hz, and spraying a basket at the aperture of 2.6-2.8 mm to obtain the compound fertilizer containing humic acid;
(5) the compound fertilizer containing humic acid obtained by granulation of the granulator special for the high tower is cooled, screened and sprayed with anti-caking oil, wherein the mass ratio of the anti-caking oil to the compound fertilizer containing humic acid is 0.5-1.3 per mill, and a finished product is obtained after packaging.
The invention has the following beneficial effects:
(1) the invention aims to provide a preparation method of a compound fertilizer containing humic acid, which effectively solves the problems of bubbles and bubbling after mixing the humic acid and a nitrogen-potassium melt liquid by matching and adding raw materials in batches, reduces the water content of a product to be less than 3 percent, solves the problem that the content of the humic acid in the product cannot be increased when the compound fertilizer is produced by a high-tower process, and reduces the process difficulty. The compound fertilizer produced by the method has the advantages of high humic acid content, high strength (the strength is over 13N), low water content, stability in the process of storage and transportation, and avoidance of the problems of pulverization and hardening.
(2) In the prior art, urea, potash fertilizer, ammonium phosphate, humic acid and organic matters are generally adopted to produce the fertilizer in the production process, but due to the large water content in the humic acid and the organic matters, the slurry is thin, the viscosity is reduced, and the granulation is difficult. The phosphorus-potassium fertilizer is added in the step (3), so that the viscosity of the slurry is effectively improved, the granulation stability is obviously improved, and the problem of difficult granulation is solved.
(3) The urea and the potash fertilizer are melted together according to the mass ratio of (10-15): 1, so that the melting temperature of the urea is reduced.
(4) The heating temperature in the step (2) is controlled to be 95-105 ℃, so that the good fluidity of the primary mixed liquid is ensured, and the problems of carbonization, decomposition, denaturation, reaction, peculiar smell and the like caused by high temperature of humic acid are effectively avoided. In addition, the internal moisture of the humic acid is evaporated at the temperature of 95-105 ℃ by feeding the humic acid in batches, so that the water content in the product is reduced, and the product strength is improved.
(5) According to the invention, through accurate temperature control, the melting temperature in the step (1) is controlled to be 120-125 ℃, the heating temperature in the step (2) is controlled to be 95-105 ℃, the heating temperature in the step (3) is controlled to be 85-100 ℃, and through the control of the temperatures in the three steps, the temperature of each stage and the total temperature are controlled as low as possible under the condition of considering good slurry fluidity (generally, slurry is thickened and solidified due to temperature reduction), so that the bubbling problem is effectively avoided.
(6) According to the invention, the humic acid is fed in batches, so that the problems of thinning and poor viscosity of the mixed solution and no granulation in product production caused by overlarge feeding amount during one-time feeding of the humic acid are prevented, and the mixing state of the raw materials in the step (3) is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a process flow diagram of the preparation method of the compound fertilizer containing humic acid.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The phosphorus-potassium fertilizer adopted by the invention is purchased from Xingsheng new material science and technology limited company, and the embodiment does not indicate specific conditions, and the phosphorus-potassium fertilizer is carried out according to conventional conditions or conditions suggested by manufacturers. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Example 1
A compound fertilizer containing humic acid is prepared from the following raw materials in parts by weight: 50 parts of urea, 1 part of ammonium phosphate, 10 parts of potassium chloride, 55 parts of humic acid, 5 parts of organic matters, 5 parts of phosphorus-potassium fertilizer and 1 part of synergist; wherein the organic matter is a mixture of potassium humate, cellulose and decomposed animal and plant residues.
The preparation method of the compound fertilizer containing humic acid, as shown in figure 1, specifically comprises the following steps:
(1) 50 parts of urea and 5 parts of potassium chloride are put into a melting tank with the temperature of 120 ℃ through a belt conveyor, a weighing scale and a bucket elevator to obtain nitrogen-potassium molten liquid;
(2) when the nitrogen-potassium melt overflows from the melting tank to a primary tank, putting ammonium phosphate and 50 parts of humic acid into the primary tank at the temperature of 105 ℃ through a vibrating screen, a weighing scale, a belt conveyor and a bucket elevator, and mixing the ammonium phosphate and the humic acid with the nitrogen-potassium melt to obtain primary mixed liquid;
(3) when the primary mixed solution overflows from the primary tank to a secondary tank, putting a mixture of potassium humate, cellulose and thoroughly decomposed animal and plant residues, a synergist, the remaining 5 parts of potassium chloride, a phosphorus-potassium fertilizer and the remaining 5 parts of humic acid into the secondary tank at the temperature of 100 ℃ through a vibrating screen, a weighing scale, a belt conveyor and a bucket elevator, and mixing the mixture with the primary mixed solution to obtain a secondary mixed solution;
(4) the secondary mixed liquid overflows from the secondary tank to a special granulator for a high tower, granulation is carried out at the frequency of 36Hz, and a basket is sprayed under the aperture of 2.6mm, so as to obtain the compound fertilizer containing humic acid;
(5) and (3) cooling, screening and spraying anti-oil-deposition compound fertilizer containing humic acid obtained by granulation of a granulator special for a high tower, wherein the mass ratio of the anti-oil-deposition compound fertilizer to the compound fertilizer containing humic acid is 1.3 per mill, and packaging to obtain a finished product.
Example 2
A compound fertilizer containing humic acid is prepared from the following raw materials in parts by weight: 30 parts of urea, 20 parts of ammonium phosphate, 5 parts of potassium sulfate, 10 parts of humic acid, 0 part of organic matter, 15 parts of phosphorus-potassium fertilizer and 0 part of synergist; wherein the organic matter is a mixture of potassium humate, cellulose and decomposed animal and plant residues.
The preparation method of the compound fertilizer containing humic acid, as shown in figure 1, specifically comprises the following steps:
(1) 30 parts of urea and 3 parts of potassium sulfate are put into a melting tank with the temperature of 125 ℃ through a belt conveyor, a weighing scale and a bucket elevator to obtain nitrogen-potassium molten liquid;
(2) when the nitrogen-potassium melt overflows from the melting tank to a primary tank, putting ammonium phosphate and 8 parts of humic acid into the primary tank at the temperature of 95 ℃ through a vibrating screen, a weighing scale, a belt conveyor and a bucket elevator, and mixing the ammonium phosphate and the humic acid with the nitrogen-potassium melt to obtain primary mixed liquid;
(3) when the primary mixed solution overflows from the primary tank to a secondary tank, putting the rest 2 parts of potassium sulfate, phosphorus-potassium fertilizer and the rest 2 parts of humic acid into the secondary tank at the temperature of 85 ℃ through a vibrating screen, a weighing scale, a belt conveyor and a bucket elevator, and mixing the secondary mixed solution with the primary mixed solution to obtain a secondary mixed solution;
(4) the secondary mixed liquid overflows from the secondary tank to a special granulator for a high tower, granulation is carried out at the frequency of 40Hz, and a basket is sprayed under the aperture of 2.8mm, so as to obtain the compound fertilizer containing humic acid;
(5) and (3) cooling, screening and spraying anti-oil-deposition compound fertilizer containing humic acid obtained by granulation of a granulator special for a high tower, wherein the mass ratio of the anti-oil-deposition compound fertilizer to the compound fertilizer containing humic acid is 0.5 per mill, and packaging to obtain a finished product.
Example 3
A compound fertilizer containing humic acid is prepared from the following raw materials in parts by weight: 45 parts of urea, 10 parts of ammonium phosphate, 20 parts of potassium chloride, 40 parts of humic acid, 10 parts of organic matters, 10 parts of phosphorus-potassium fertilizer and 1 part of synergist; wherein the organic matter is a mixture of potassium humate, cellulose and decomposed animal and plant residues.
The preparation method of the compound fertilizer containing humic acid, as shown in figure 1, specifically comprises the following steps:
(1) putting 45 parts of urea and 3 parts of potassium chloride into a melting tank with the temperature of 122 ℃ through a belt conveyor, a weighing scale and a bucket elevator to obtain nitrogen-potassium molten liquid;
(2) when the nitrogen potassium melt overflows from the melting tank to a primary tank, putting ammonium phosphate and 30 parts of humic acid into the primary tank at the temperature of 100 ℃ through a vibrating screen, a weighing scale, a belt conveyor and a bucket elevator, and mixing the ammonium phosphate and the humic acid with the nitrogen potassium melt to obtain primary mixed liquid;
(3) when the primary mixed solution overflows from the primary tank to a secondary tank, putting a mixture of potassium humate, cellulose and thoroughly decomposed animal and plant residues, a synergist, the rest 17 parts of potassium chloride, a phosphorus-potassium fertilizer and the rest 10 parts of humic acid into the secondary tank at the temperature of 95 ℃ through a vibrating screen, a weighing scale, a belt conveyor and a bucket elevator, and mixing the mixture with the primary mixed solution to obtain a secondary mixed solution;
(4) the secondary mixed liquid overflows from the secondary tank to a special granulator for a high tower, granulation is carried out at the frequency of 33Hz, and a basket is sprayed under the aperture of 2.8mm, so as to obtain the compound fertilizer containing humic acid;
(5) and (3) cooling, screening and spraying anti-oil-deposition compound fertilizer containing humic acid obtained by granulation of a granulator special for a high tower, wherein the mass ratio of the anti-oil-deposition compound fertilizer to the compound fertilizer containing humic acid is 0.9 per thousand, and packaging to obtain a finished product.
Comparative example 1
A compound fertilizer is prepared from the following raw materials in parts by weight: 50 parts of urea, 1 part of ammonium phosphate, 10 parts of potassium chloride, 55 parts of humic acid, 5 parts of organic matters, 5 parts of phosphorus-potassium fertilizer and 1 part of synergist; wherein the organic matter is a mixture of potassium humate, cellulose and decomposed animal and plant residues.
The preparation method of the compound fertilizer comprises the following steps:
(1) 50 parts of urea and 5 parts of potassium chloride are put into a melting tank with the temperature of 120 ℃ through a belt conveyor, a weighing scale and a bucket elevator to obtain nitrogen-potassium molten liquid;
(2) when the nitrogen-potassium melt overflows from the melting tank to a primary tank, feeding ammonium phosphate, humic acid, potassium humate, cellulose, decomposed animal and plant residues, a synergist, a phosphorus-potassium-containing fertilizer and the remaining 5 parts of potassium chloride into the primary tank at the temperature of 105 ℃ through a vibrating screen, a weighing scale, a belt conveyor and a bucket elevator, and mixing the mixture with the nitrogen-potassium melt to obtain primary mixed liquid;
(3) and the primary mixed liquid overflows from the primary tank to a secondary tank with the temperature of 100 ℃, overflows from the secondary tank to a special granulator for a high tower, is granulated at the frequency of 36Hz, and is sprayed with a basket with the aperture of 2.6mm, so that granulation cannot be carried out, and the compound fertilizer cannot be obtained.
This comparative example differs from the examples in that: in the preparation method, other raw materials except urea are added into the primary tank at one time, and the raw materials are not matched and added in batches.
The invention is proved that the humic acid is fed in batches, which not only prevents the problems of the thinning and poor viscosity of the mixed solution and the non-granulation of the product caused by the overlarge feeding amount when the humic acid is fed at one time, but also effectively improves the mixing state of the raw materials in the step (3).
Comparative example 2
This comparative example differs from example 1 in that: the temperature of the primary tank in the step (2) was 125 ℃, and the other steps and parameter conditions were the same as those in example 1. As a result, no granules were obtained in the granulator, and no compound fertilizer was obtained.
The heating temperature in the step (2) is controlled to be 95-105 ℃, so that the good fluidity of the primary mixed solution is ensured, the problems of carbonization, decomposition, denaturation, reaction, peculiar smell and the like caused by high temperature of humic acid are effectively avoided, and the problem that granulation cannot be carried out is solved.
Test example 1
The compound fertilizer containing humic acid prepared in the embodiments 1-3 of the invention and the existing compound fertilizer are respectively tested for product performance according to the method of GB/T18877-:
table 1 product performance test results table
| Example 1 | Example 2 | Example 3 | Existing compound fertilizer | |
| Humic acid content (%) | 55 | 10 | 40 | 8 |
| Strength (N) | 13.2 | 15.8 | 13.9 | 7 |
| Moisture content (%) | 2.3 | 1.7 | 2.0 | 10 |
The prior compound fertilizer is a compound fertilizer containing humic acid and purchased from common markets.
As can be seen from the table, compared with the common commercially available compound fertilizer containing humic acid, the compound fertilizer containing humic acid prepared by the invention has the advantages of higher humic acid content, higher strength and lower water content. The preparation method of the compound fertilizer containing humic acid can obviously improve the content of humic acid in the compound fertilizer, reduce the water content in the product and improve the strength of the product.
In conclusion, the invention effectively solves the problems of bubbles and bubbling after mixing the humic acid and the nitrogen potassium melt by matching and adding the raw materials in batches, reduces the water content of the product to less than 3 percent, solves the problem that the content of the humic acid in the product cannot be increased when the compound fertilizer is produced by a high tower process, and reduces the process difficulty. The compound fertilizer produced by the method has the advantages of high humic acid content, high strength (the strength is over 13N), low water content, stability in the process of storage and transportation, and avoidance of the problems of pulverization and hardening.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The preparation method of the compound fertilizer containing humic acid is characterized by comprising the following steps:
(1) mixing urea and a potash fertilizer and heating to melt to obtain nitrogen-potassium molten liquid;
(2) mixing and heating a phosphate fertilizer, humic acid and the nitrogen-potassium molten liquid obtained in the step (1) to obtain a first-stage mixed liquid;
(3) mixing and heating organic matters, a synergist, a potassium fertilizer, a phosphorus-potassium fertilizer and humic acid with the primary mixed solution obtained in the step (2) to obtain a secondary mixed solution;
(4) and (4) granulating the secondary mixed liquid obtained in the step (3) to obtain the compound fertilizer containing humic acid.
2. The preparation method of the humic acid-containing compound fertilizer as claimed in claim 1, wherein the heating temperature in the step (1) is 120-125 ℃.
3. The preparation method of the compound fertilizer containing the humic acid as claimed in claim 1, wherein in the step (1), the urea is 30-50 parts by weight;
preferably, the mass ratio of the urea to the potash fertilizer is (10-15): 1.
4. The preparation method of the humic acid-containing compound fertilizer as claimed in claim 1, wherein the total weight of the potash fertilizer in the step (1) and the step (3) is 5-20 parts;
preferably, the potash fertilizer in the step (3) is the residual potash fertilizer in the step (1);
preferably, the potash fertilizer is potassium chloride or potassium sulfate.
5. The preparation method of the humic acid-containing compound fertilizer as claimed in claim 1, wherein the heating temperature in the step (2) is 95-105 ℃.
6. The preparation method of the humic acid-containing compound fertilizer as claimed in claim 1, wherein in the step (2), the phosphate fertilizer is 1-20 parts by weight;
preferably, the phosphate fertilizer is ammonium phosphate.
7. The preparation method of the humic acid-containing compound fertilizer as claimed in claim 1, wherein the total weight of the humic acid in the step (2) and the step (3) is 10-55 parts;
preferably, in the step (2), the weight of the humic acid is less than 50% of the total weight of all the raw materials in the steps (1) to (3);
preferably, the humic acid in the step (3) is the remaining humic acid in the step (2);
preferably, the humic acid is carbon-containing humic acid.
8. The preparation method of the compound fertilizer containing humic acid as claimed in claim 1, wherein the heating temperature in the step (3) is 85-100 ℃.
9. The preparation method of the humic acid-containing compound fertilizer as claimed in claim 1, wherein the organic matter is 0-10 parts by weight, the synergist is 0-1 part by weight, and the phosphorus-potassium fertilizer is 5-15 parts by weight;
preferably, the organic matter comprises potassium humate, cellulose and decomposed animal and plant residues;
preferably, the synergist is a synergist containing any one or more of zinc, boron, manganese, iron, calcium or magnesium.
10. The preparation method of the humic acid-containing compound fertilizer as claimed in claim 1, wherein in the step (4), the granulation frequency is 33-40 Hz, and the aperture of the spray basket in the granulation is 2.6-2.8 mm;
preferably, in the step (4), the method further comprises the steps of cooling, screening and spraying anti-caking oil after granulation;
preferably, the mass ratio of the anti-caking oil to the humic acid-containing compound fertilizer is 0.5-1.3 per mill.
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| CN102285830A (en) * | 2010-06-18 | 2011-12-21 | 河南财鑫实业化工有限责任公司 | Method for preparing high-tower organic-inorganic compound fertilizer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102285830A (en) * | 2010-06-18 | 2011-12-21 | 河南财鑫实业化工有限责任公司 | Method for preparing high-tower organic-inorganic compound fertilizer |
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