CN115490549A - Ammonium polyphosphate-containing compound fertilizer and preparation method thereof - Google Patents
Ammonium polyphosphate-containing compound fertilizer and preparation method thereof Download PDFInfo
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- CN115490549A CN115490549A CN202211029617.7A CN202211029617A CN115490549A CN 115490549 A CN115490549 A CN 115490549A CN 202211029617 A CN202211029617 A CN 202211029617A CN 115490549 A CN115490549 A CN 115490549A
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- compound fertilizer
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- ammonium polyphosphate
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- 239000003337 fertilizer Substances 0.000 title claims abstract description 62
- 150000001875 compounds Chemical class 0.000 title claims abstract description 42
- 239000004114 Ammonium polyphosphate Substances 0.000 title claims abstract description 35
- 235000019826 ammonium polyphosphate Nutrition 0.000 title claims abstract description 35
- 229920001276 ammonium polyphosphate Polymers 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims description 7
- 239000002002 slurry Substances 0.000 claims abstract description 42
- 239000004254 Ammonium phosphate Substances 0.000 claims abstract description 25
- 229910000148 ammonium phosphate Inorganic materials 0.000 claims abstract description 25
- 235000019289 ammonium phosphates Nutrition 0.000 claims abstract description 25
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005469 granulation Methods 0.000 claims abstract description 16
- 230000003179 granulation Effects 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000001035 drying Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004202 carbamide Substances 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 11
- 239000007787 solid Substances 0.000 claims abstract description 9
- 239000011268 mixed slurry Substances 0.000 claims description 30
- 239000011573 trace mineral Substances 0.000 claims description 24
- 235000013619 trace mineral Nutrition 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 12
- 238000007602 hot air drying Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 239000010459 dolomite Substances 0.000 claims description 5
- 229910000514 dolomite Inorganic materials 0.000 claims description 5
- 229940072033 potash Drugs 0.000 claims description 5
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 5
- 235000015320 potassium carbonate Nutrition 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims description 3
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims description 3
- 235000019837 monoammonium phosphate Nutrition 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000005749 Copper compound Substances 0.000 claims description 2
- 150000001639 boron compounds Chemical class 0.000 claims description 2
- YYRMJZQKEFZXMX-UHFFFAOYSA-L calcium bis(dihydrogenphosphate) Chemical compound [Ca+2].OP(O)([O-])=O.OP(O)([O-])=O YYRMJZQKEFZXMX-UHFFFAOYSA-L 0.000 claims description 2
- 229940043430 calcium compound Drugs 0.000 claims description 2
- 150000001674 calcium compounds Chemical class 0.000 claims description 2
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 2
- 150000001880 copper compounds Chemical class 0.000 claims description 2
- 238000010410 dusting Methods 0.000 claims description 2
- 150000002681 magnesium compounds Chemical class 0.000 claims description 2
- 150000002697 manganese compounds Chemical class 0.000 claims description 2
- 239000005078 molybdenum compound Substances 0.000 claims description 2
- 150000002752 molybdenum compounds Chemical class 0.000 claims description 2
- 235000019691 monocalcium phosphate Nutrition 0.000 claims description 2
- 238000009818 secondary granulation Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 150000003464 sulfur compounds Chemical class 0.000 claims description 2
- 150000003752 zinc compounds Chemical class 0.000 claims description 2
- 229910000388 diammonium phosphate Inorganic materials 0.000 claims 1
- 235000019838 diammonium phosphate Nutrition 0.000 claims 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 abstract description 5
- 239000011591 potassium Substances 0.000 abstract description 5
- 229910052700 potassium Inorganic materials 0.000 abstract description 5
- 239000008187 granular material Substances 0.000 abstract description 3
- 239000002686 phosphate fertilizer Substances 0.000 abstract description 2
- 239000000725 suspension Substances 0.000 abstract description 2
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 6
- 229910052698 phosphorus Inorganic materials 0.000 description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- -1 diamine hydrogen phosphate Chemical class 0.000 description 4
- 239000011361 granulated particle Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- YWEUIGNSBFLMFL-UHFFFAOYSA-N diphosphonate Chemical compound O=P(=O)OP(=O)=O YWEUIGNSBFLMFL-UHFFFAOYSA-N 0.000 description 3
- 238000001599 direct drying Methods 0.000 description 3
- 230000002045 lasting effect Effects 0.000 description 3
- DLYUQMMRRRQYAE-UHFFFAOYSA-N phosphorus pentoxide Inorganic materials O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 3
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 3
- 229910001950 potassium oxide Inorganic materials 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000013522 chelant Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 229920000388 Polyphosphate Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 239000001205 polyphosphate Substances 0.000 description 1
- 235000011176 polyphosphates Nutrition 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 229910052939 potassium sulfate Inorganic materials 0.000 description 1
- 235000011151 potassium sulphates Nutrition 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Fertilizers (AREA)
Abstract
The invention relates to a method for preparing a compound fertilizer containing ammonium polyphosphate, which utilizes solid ammonium phosphate to prepare ammonium phosphate slurry solution with the water content of less than 35 percent, adds potassium fertilizer, auxiliary materials and the like to mix, prepares slurry, granulates, adds drying equipment to dry the excessive water of the particles after granulation to reach the product standard, and changes the traditional method of adding phosphate fertilizer, potassium fertilizer and auxiliary materials by utilizing urea or ammonium nitrate solution, thereby producing products which accord with the product identification. Can obtain a novel compound fertilizer product containing short-chain ammonium polyphosphate, and prolongs the fertilizer efficiency and the suspension property of the product.
Description
Technical Field
The invention relates to the technical field of fertilizer manufacturing, in particular to a compound fertilizer containing ammonium polyphosphate and a preparation method thereof.
Background
The ammonium polyphosphate is a non-halogen flame retardant with excellent performance, is almost insoluble in water with high polymerization degree, and has the excellent characteristics of high-efficiency flame retardance, environmental friendliness, small addition amount, small influence on mechanical properties and the like.
Ammonium polyphosphate is a polyphosphate containing N and P, and can be classified into oligomeric, polymeric and polymeric 3 types according to the degree of polymerization, and the higher the degree of polymerization, the smaller the water solubility, and the larger the water solubility. The ammonium polyphosphate can be divided into crystal form and amorphous form according to the structure, and the crystal form ammonium polyphosphate is long-chain water-insoluble salt. The molecular general formula of ammonium polyphosphate is (NH 3) n +2PnO3n +1, and when n is less than 20, the ammonium polyphosphate is water-soluble; when n is more than 20, it is hardly soluble.
At present, few enterprises are available for producing ammonium polyphosphate fertilizers in China, and few enterprises are available for professional production of ammonium polyphosphate fertilizers, in the prior art, phosphate fertilizers generally contain more orthophosphate, but orthophosphate and various trace elements can generate different reactions, crystallization and precipitation, the trace elements are substances necessary for healthy growth of plants, and if the trace elements are precipitated with orthophosphate before being absorbed by the plants, the plants cannot absorb the trace elements, and the trace elements are generally not used together with the phosphate fertilizers.
Compared with orthophosphate, ammonium polyphosphate can chelate part of metal elements, such as iron, zinc and the like. However, the research and development of ammonium polyphosphate in China is laggard, so that the production of the ammonium polyphosphate-containing compound fertilizer by domestic enterprises is generally liquid fertilizer, and the enterprises which are made into solid fertilizer are rare, and the liquid fertilizer is easy to leak in the transportation process, so that the transportation cost of the ammonium polyphosphate-containing compound fertilizer is greatly increased. Therefore, the compound fertilizer containing ammonium polyphosphate and the preparation method thereof are provided to solve the problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a compound fertilizer containing ammonium polyphosphate and a preparation method thereof.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention relates to a compound fertilizer containing ammonium polyphosphate and a preparation method thereof, wherein the method comprises the following steps:
s1, adding solid ammonium phosphate into a first mixed slurry tank containing water to prepare an ammonium phosphate slurry solution, and simultaneously adding urea with the weight percentage of 0-5% of the ammonium phosphate to obtain mixed slurry I;
s2: introducing the mixed slurry I into a second mixed slurry tank, adding a potash fertilizer into the second mixed slurry tank through a potash fertilizer feeder, adding a trace element I into the second mixed slurry tank through a trace element I feeder, and performing melt mixing to obtain mixed slurry II;
s3: introducing the mixed slurry II into a third mixed slurry tank, adding urea or a mixture of urea and auxiliary materials, and carrying out melt mixing to obtain granulation slurry;
s4: introducing the granulation slurry into a rotary drum granulator through a lifter, and stirring and granulating the granulation slurry through the rotary drum granulator to obtain compound fertilizer particles;
s5: and drying the compound fertilizer granules by using drying equipment, cooling and screening after drying, and finally performing powder dusting and oil spraying wrapping on the qualified compound fertilizer granules to obtain the compound fertilizer.
Preferably, the solid ammonium phosphate in S1 is any two or more of ammonium dihydrogen phosphate, diamine hydrogen phosphate and calcium superphosphate.
Preferably, the weight ratio of the solid ammonium phosphate to the water in S1 is (0.65-0.95): (0.05-0.35), controlling the temperature in the first mixed slurry tank to be 100-130 ℃;
preferably, the temperature in the second mixing slurry tank in the S2 is controlled to be 100-120 ℃;
preferably, the temperature in the third mixing slurry tank in the S3 is controlled to be 100-110 ℃;
preferably, the temperature in the drying equipment in S5 is controlled at 200-250 ℃;
preferably, the ammonium phosphate slurry solution in S1 is concentrated by an evaporator, and the weight percentage of ammonium phosphate in the concentrated ammonium phosphate slurry solution is 65% -75%.
Preferably, the drying device in S5 is a hot air drying device; the residence time of the compound fertilizer particles in the hot air drying device is controlled to be 10-30 minutes.
Preferably, the unqualified compound fertilizer particles screened in the step S5 are crushed by a crusher and transported to the rotary drum granulator by a material returning hoister for secondary granulation.
Preferably, the first trace element in S2 is calcium compound, magnesium compound, sulfur compound, manganese compound.
Preferably, the auxiliary material in S3 is one or more of trace elements II and dolomite powder, and the trace elements II comprise molybdenum compounds, zinc compounds, copper compounds and boron compounds.
Compared with the prior art, the invention has the following beneficial effects:
1. the compound fertilizer is a solid fertilizer, so that the transportation cost is reduced, and the compound fertilizer is easy to popularize.
2. And drying equipment is added after granulation, and redundant moisture of the granulated particles is dried, so that the problem that the mass percentage content of moisture of the ammonium phosphate compound fertilizer raw material cannot be higher than 3% is solved.
3. The compound fertilizer can simultaneously contain ammonium polyphosphate and trace elements, the ammonium polyphosphate can generate a completely water-soluble chelate with the trace elements such as zinc, iron and the like, and the phosphate fertilizer and the trace elements can be simultaneously supplemented to plants.
4. Can obtain a novel ammonium phosphate compound fertilizer product containing short-chain ammonium polyphosphate, and prolongs the fertilizer efficiency and the suspension property of the product.
5. The ammonium polyphosphate can be directly produced, and can be directly granulated, and can also be granulated by adding potash fertilizer and trace elements, so that the process is simple, and the production cost is reduced.
Detailed Description
Example 1
(1) 500kg of ammonium phosphate slurry solution was concentrated by an evaporator to obtain an ammonium phosphate slurry solution containing 26% of water, and 25kg of urea was added to a first mixed slurry tank at 110 ℃ and mixed, and then introduced from the first mixed slurry tank to a second mixed slurry tank.
(2) And enabling the mixture slurry I with the temperature of 106 ℃ to flow into a second mixing slurry tank with the temperature of 115 ℃, and adding 230kg of potassium chloride and 10kg of trace element I into the second mixing slurry tank to be melted and mixed to obtain a mixture slurry II with the temperature of 110 ℃.
(3) And the mixture slurry II with the temperature of 110 ℃ flows into a third mixing slurry tank with the temperature of 110 ℃, 270kg of urea and 10kg of trace element slurry II are added and melted and mixed to obtain granulation slurry with the temperature of 100 ℃, and the granulation slurry enters a rotary drum granulator.
(4) And feeding the granulation slurry with the temperature of 100 ℃ into a rotary drum granulator through a lifting machine, and stirring and granulating the granulation slurry through the rotary drum granulator to obtain the compound fertilizer particles with the temperature of 90 ℃.
(5) And (3) dropping the granulated particles into a hot air drying device, conveying hot air with the temperature of 120 ℃ from the hot air drying device, carrying out countercurrent contact with the materials for direct drying, drying excessive moisture after lasting for 30 minutes, and cooling and screening to obtain the compound fertilizer particles.
Detecting the obtained compound fertilizer product:
the nitrogen content is 13.32%, the phosphorus content (calculated by phosphorus pentoxide) is 16.23%, the potassium content (calculated by potassium oxide) is 14.35%, and the water content is 1.8%, and all indexes meet GB15063-2009.
Example 2
(1) 440kg of ammonium phosphate, 50kg of water and 22kg of urea are added into the first mixed slurry tank, and the mixture is heated to 120 ℃ for 30 minutes to obtain slurry containing partial short-chain ammonium polyphosphate.
(2) And the slurry containing part of short-chain ammonium polyphosphate at the temperature of 112 ℃ flows into a second mixed slurry tank at the temperature of 120 ℃, and 280kg of potassium sulfate and 10kg of trace elements are added for melting and mixing to obtain the slurry at the temperature of 115 ℃.
(3) And the slurry with the temperature of 115 ℃ flows into a third mixed slurry tank with the temperature of 110 ℃, is mixed with 220kg of urea, 60kg of dolomite powder and 10kg of trace element II which are added to obtain granulation slurry with the temperature of 108 ℃, and then the granulation slurry enters a rotary drum granulator.
(4) And dropping the granulated particles into a hot air drying device, conveying hot air with the temperature of 100 ℃ from the hot air drying device, carrying out countercurrent contact with the materials for direct drying, drying redundant moisture after lasting for 30 minutes, and then cooling and screening to obtain the compound fertilizer particles.
Detecting the obtained compound fertilizer product:
the nitrogen content is 15.02%, the phosphorus content (calculated by phosphorus pentoxide) is 19.89%, the potassium content (calculated by potassium oxide) is 15.65%, and the water content is 1.4%, and all indexes meet GB15063-2009.
Example 3
(1) 400kg of ammonium phosphate, 50kg of water and 40kg of urea are added into the first mixed slurry tank, and the mixture is heated to 130 ℃ for 30 minutes to obtain slurry containing partial short-chain ammonium polyphosphate.
(2) And the slurry with the temperature of 112 ℃ and containing partial short-chain ammonium polyphosphate flows into a second mixed slurry tank with the temperature of 120 ℃, and 100kg of potassium chloride, 100kg of dolomite powder and 10kg of trace elements are added for melting and mixing to obtain the slurry with the temperature of 112 ℃.
(3) And the slurry with the temperature of 112 ℃ flows into a third mixed slurry tank with the temperature of 110 ℃, is mixed with 100kg of urea, 200kg of dolomite powder and 10kg of microelement II which are added to obtain granulation slurry with the temperature of 100 ℃, and then the granulation slurry enters a rotary drum granulator.
(4) And dropping the granulated particles into a hot air drying device, conveying hot air with the temperature of 100 ℃ from the hot air drying device, performing countercurrent contact with the materials for direct drying, drying redundant moisture after lasting for 30 minutes, and cooling and screening to obtain the compound fertilizer particles.
Detecting the obtained compound fertilizer product:
the nitrogen content is 14.12%, the phosphorus content (calculated by phosphorus pentoxide) is 16.89%, the potassium content (calculated by potassium oxide) is 6.65%, and the water content is 1.1%, and all indexes meet GB15063-2009.
The percentages in examples 1 to 3 are all mass percentages; the ammonium phosphate in examples 2 and 3 includes ammonium dihydrogen phosphate and/or diamine hydrogen phosphate.
In the compound fertilizer product in the above embodiment, the method for measuring the mass percentage content of phosphorus is a method of GB8573-2010 'determination of effective phosphorus content in compound fertilizer', the method for measuring the mass percentage content of nitrogen is a method of GB8572-2010 'determination of total nitrogen content in compound fertilizer', and the method for measuring the degree of polymerization is GB/T9984.3-2004.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. 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 (7)
1. A preparation method of a compound fertilizer containing ammonium polyphosphate is characterized by comprising the following steps:
s1, adding solid ammonium phosphate into a first mixed slurry tank containing water to prepare an ammonium phosphate slurry solution, and simultaneously adding urea with the weight percentage of 0-5% of the ammonium phosphate to obtain mixed slurry I;
s2: introducing the mixed slurry I into a second mixed slurry tank, adding a potash fertilizer into the second mixed slurry tank through a potash fertilizer feeder, adding a trace element I into the second mixed slurry tank through a trace element I feeder, and performing melt mixing to obtain mixed slurry II;
s3: introducing the mixed slurry II into a third mixed slurry tank, adding urea or a mixture of urea and auxiliary materials, and carrying out melt mixing to obtain granulation slurry;
s4: introducing the granulation slurry into a rotary drum granulator through a lifter, and stirring and granulating the granulation slurry through the rotary drum granulator to obtain compound fertilizer particles;
s5: drying compound fertilizer particles by drying equipment, cooling and screening after drying, and finally performing powder dusting and oil spraying wrapping on the qualified compound fertilizer particles to obtain the compound fertilizer;
the weight ratio of the solid ammonium phosphate to the water in the S1 is (0.65-0.95): (0.05-0.35), controlling the temperature in the first mixed slurry tank to be 100-130 ℃; the temperature in the second slurry mixing tank in the S2 is controlled to be 100-120 ℃; the temperature in the third mixed slurry tank in the S3 is controlled to be 100-110 ℃; the temperature in the drying equipment described in S5 is controlled at 200-250 ℃.
2. The method for preparing a compound fertilizer containing ammonium polyphosphate according to claim 1, wherein the solid ammonium phosphate in S1 is any two or more of ammonium dihydrogen phosphate, diammonium hydrogen phosphate, and calcium superphosphate.
3. The method for preparing a compound fertilizer containing ammonium polyphosphate according to claim 1, wherein the ammonium phosphate slurry solution in S1 is concentrated by an evaporator, and the weight percentage of ammonium phosphate in the concentrated ammonium phosphate slurry solution is 65-75%.
4. The method for preparing a compound fertilizer containing ammonium polyphosphate according to claim 1, wherein the drying equipment in S5 is a hot air drying device; the residence time of the compound fertilizer particles in the hot air drying device is controlled to be 10-30 minutes.
5. The method for preparing a compound fertilizer containing ammonium polyphosphate according to claim 1, wherein the unqualified compound fertilizer particles screened in the step S5 are crushed by a crusher and transported to the rotary drum granulator by a material returning elevator for secondary granulation.
6. The method for preparing a compound fertilizer containing ammonium polyphosphate according to claim 1, wherein the first trace element in S2 is a calcium compound, a magnesium compound, a sulfur compound, or a manganese compound.
7. The method for preparing a compound fertilizer containing ammonium polyphosphate according to claim 6, wherein the auxiliary material in S3 is any one or more of a second trace element and dolomite powder, and the second trace element comprises a molybdenum compound, a zinc compound, a copper compound and a boron compound.
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| CN202211029617.7A CN115490549A (en) | 2022-08-26 | 2022-08-26 | Ammonium polyphosphate-containing compound fertilizer and preparation method thereof |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102633553A (en) * | 2012-04-27 | 2012-08-15 | 深圳市芭田生态工程股份有限公司 | Method for producing high-tower ammonium phosphate compound fertilizer |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102633553A (en) * | 2012-04-27 | 2012-08-15 | 深圳市芭田生态工程股份有限公司 | Method for producing high-tower ammonium phosphate compound fertilizer |
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