CN113214023A - High-magnesium nitrogen potassium compound fertilizer, preparation method thereof and mineral source long-acting magnesium nitrogen potassium compound fertilizer - Google Patents
High-magnesium nitrogen potassium compound fertilizer, preparation method thereof and mineral source long-acting magnesium nitrogen potassium compound fertilizer Download PDFInfo
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- CN113214023A CN113214023A CN202110153836.5A CN202110153836A CN113214023A CN 113214023 A CN113214023 A CN 113214023A CN 202110153836 A CN202110153836 A CN 202110153836A CN 113214023 A CN113214023 A CN 113214023A
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- 239000011777 magnesium Substances 0.000 title claims abstract description 156
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 154
- 239000003337 fertilizer Substances 0.000 title claims abstract description 150
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 96
- 239000011707 mineral Substances 0.000 title claims abstract description 96
- DHKHZGZAXCWQTA-UHFFFAOYSA-N [N].[K] Chemical compound [N].[K] DHKHZGZAXCWQTA-UHFFFAOYSA-N 0.000 title claims abstract description 26
- PEDHPVGEXVYWEM-UHFFFAOYSA-N [Mg].[K].[N] Chemical compound [Mg].[K].[N] PEDHPVGEXVYWEM-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 125
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 68
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000004202 carbamide Substances 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 37
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 25
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000011591 potassium Substances 0.000 claims abstract description 22
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000011593 sulfur Substances 0.000 claims abstract description 17
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 17
- 235000010755 mineral Nutrition 0.000 claims description 90
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 37
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 32
- 239000002002 slurry Substances 0.000 claims description 28
- 239000008187 granular material Substances 0.000 claims description 24
- 150000001875 compounds Chemical class 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 22
- 239000000126 substance Substances 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 19
- 238000005469 granulation Methods 0.000 claims description 18
- 230000003179 granulation Effects 0.000 claims description 18
- 238000002844 melting Methods 0.000 claims description 18
- 230000008018 melting Effects 0.000 claims description 18
- 239000001103 potassium chloride Substances 0.000 claims description 17
- 235000011164 potassium chloride Nutrition 0.000 claims description 17
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 16
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 16
- 239000011248 coating agent Substances 0.000 claims description 13
- 238000000576 coating method Methods 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 12
- 238000004806 packaging method and process Methods 0.000 claims description 12
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 11
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 11
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 11
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 10
- 230000003750 conditioning effect Effects 0.000 claims description 10
- 238000004090 dissolution Methods 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 10
- 238000012216 screening Methods 0.000 claims description 10
- 239000008399 tap water Substances 0.000 claims description 10
- 235000020679 tap water Nutrition 0.000 claims description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 9
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 8
- 230000001804 emulsifying effect Effects 0.000 claims description 8
- 239000011268 mixed slurry Substances 0.000 claims description 8
- 229940072033 potash Drugs 0.000 claims description 8
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 8
- 235000015320 potassium carbonate Nutrition 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 6
- 229940095686 granule product Drugs 0.000 claims description 6
- 239000000395 magnesium oxide Substances 0.000 claims description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 6
- 239000002366 mineral element Substances 0.000 claims description 6
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 6
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 6
- 235000011151 potassium sulphates Nutrition 0.000 claims description 6
- 238000010008 shearing Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 3
- 235000019270 ammonium chloride Nutrition 0.000 claims description 3
- 235000011132 calcium sulphate Nutrition 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 229930002875 chlorophyll Natural products 0.000 abstract description 14
- 235000019804 chlorophyll Nutrition 0.000 abstract description 14
- ATNHDLDRLWWWCB-AENOIHSZSA-M chlorophyll a Chemical compound C1([C@@H](C(=O)OC)C(=O)C2=C3C)=C2N2C3=CC(C(CC)=C3C)=[N+]4C3=CC3=C(C=C)C(C)=C5N3[Mg-2]42[N+]2=C1[C@@H](CCC(=O)OC\C=C(/C)CCC[C@H](C)CCC[C@H](C)CCCC(C)C)[C@H](C)C2=C5 ATNHDLDRLWWWCB-AENOIHSZSA-M 0.000 abstract description 14
- 239000000047 product Substances 0.000 description 22
- 239000002245 particle Substances 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 16
- 238000000034 method Methods 0.000 description 14
- 239000002689 soil Substances 0.000 description 11
- 208000008167 Magnesium Deficiency Diseases 0.000 description 9
- 235000004764 magnesium deficiency Nutrition 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 description 6
- 229940061634 magnesium sulfate heptahydrate Drugs 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 235000015097 nutrients Nutrition 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 238000004945 emulsification Methods 0.000 description 4
- 235000016709 nutrition Nutrition 0.000 description 4
- 239000013589 supplement Substances 0.000 description 4
- 240000007087 Apium graveolens Species 0.000 description 3
- 230000035764 nutrition Effects 0.000 description 3
- 230000000243 photosynthetic effect Effects 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
- 150000003839 salts Chemical class 0.000 description 3
- 239000004254 Ammonium phosphate Substances 0.000 description 2
- 235000010149 Brassica rapa subsp chinensis Nutrition 0.000 description 2
- 235000000536 Brassica rapa subsp pekinensis Nutrition 0.000 description 2
- 241000499436 Brassica rapa subsp. pekinensis Species 0.000 description 2
- 229910019094 Mg-S Inorganic materials 0.000 description 2
- 229910019397 Mg—S Inorganic materials 0.000 description 2
- 229910000148 ammonium phosphate Inorganic materials 0.000 description 2
- 235000019289 ammonium phosphates Nutrition 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000004720 fertilization Effects 0.000 description 2
- 239000000796 flavoring agent Substances 0.000 description 2
- 235000019634 flavors Nutrition 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- SWHAQEYMVUEVNF-UHFFFAOYSA-N magnesium potassium Chemical compound [Mg].[K] SWHAQEYMVUEVNF-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000618 nitrogen fertilizer Substances 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- 239000003895 organic fertilizer Substances 0.000 description 2
- SMDQFHZIWNYSMR-UHFFFAOYSA-N sulfanylidenemagnesium Chemical compound S=[Mg] SMDQFHZIWNYSMR-UHFFFAOYSA-N 0.000 description 2
- 208000001889 Acid-Base Imbalance Diseases 0.000 description 1
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- 208000019901 Anxiety disease Diseases 0.000 description 1
- 235000015849 Apium graveolens Dulce Group Nutrition 0.000 description 1
- 235000010591 Appio Nutrition 0.000 description 1
- 208000024172 Cardiovascular disease Diseases 0.000 description 1
- 206010008190 Cerebrovascular accident Diseases 0.000 description 1
- 208000006545 Chronic Obstructive Pulmonary Disease Diseases 0.000 description 1
- 208000032928 Dyslipidaemia Diseases 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 206010015856 Extrasystoles Diseases 0.000 description 1
- 206010020772 Hypertension Diseases 0.000 description 1
- 208000017170 Lipid metabolism disease Diseases 0.000 description 1
- 206010028980 Neoplasm Diseases 0.000 description 1
- 208000000418 Premature Cardiac Complexes Diseases 0.000 description 1
- 208000013738 Sleep Initiation and Maintenance disease Diseases 0.000 description 1
- 208000006011 Stroke Diseases 0.000 description 1
- 208000001871 Tachycardia Diseases 0.000 description 1
- 244000269722 Thea sinensis Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 206010003119 arrhythmia Diseases 0.000 description 1
- 230000006793 arrhythmia Effects 0.000 description 1
- 208000006673 asthma Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 229910052599 brucite Inorganic materials 0.000 description 1
- YYRMJZQKEFZXMX-UHFFFAOYSA-L calcium bis(dihydrogenphosphate) Chemical compound [Ca+2].OP(O)([O-])=O.OP(O)([O-])=O YYRMJZQKEFZXMX-UHFFFAOYSA-L 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 206010012601 diabetes mellitus Diseases 0.000 description 1
- 208000010643 digestive system disease Diseases 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 235000021384 green leafy vegetables Nutrition 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
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- 206010022437 insomnia Diseases 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 235000019691 monocalcium phosphate Nutrition 0.000 description 1
- 210000000653 nervous system Anatomy 0.000 description 1
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- 238000010672 photosynthesis Methods 0.000 description 1
- 238000001243 protein synthesis Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 239000002881 soil fertilizer Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000006794 tachycardia Effects 0.000 description 1
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- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
Images
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
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/30—Anti-agglomerating additives; Anti-solidifying additives
-
- 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
- C05G3/40—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting fertiliser dosage or release rate; for affecting solubility
-
- 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
-
- 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
- C05G5/30—Layered or coated, e.g. dust-preventing coatings
Abstract
The invention provides a mineral source long-acting magnesium-nitrogen-potassium compound fertilizer which comprises, by weight, 40-80 parts of urea, 1-20 parts of other nitrogen fertilizers, 1-20 parts of potassium fertilizers and 5-40 parts of mineral magnesium, wherein the mineral magnesium contains magnesium and sulfur, and the dissolving speed of the mineral magnesium in water is smaller than that of the urea, the other nitrogen fertilizers and the potassium fertilizers in water. The high-magnesium nitrogen potassium compound fertilizer, the preparation method and the mineral source long-acting magnesium nitrogen potassium compound fertilizer provided by the invention can better improve the chlorophyll content.
Description
Technical Field
The invention belongs to the technical field of compound fertilizer production, and particularly relates to a high-magnesium nitrogen potassium compound fertilizer, a preparation method thereof and a mineral source long-acting magnesium nitrogen potassium compound fertilizer.
Background
Through the rapid development of Chinese agriculture in recent decades, the yield of the Chinese agriculture basically meets the living requirements of people in China, but with the continuous development and progress of society, safe, nutritional and delicious agricultural products become the latest urgent requirements of people in China.
In green crops planted in agriculture, magnesium (Mg), which is an essential element for chlorophyll, is a central atom of chlorophyll, and the Mg participating in chlorophyll synthesis can reach 35% at most. Magnesium is an essential element involved in the transfer of photosynthetic products from a source organ (mature leaf) to a sink organ (root system, seed, fruit, etc.), and is an important component of energy substances required for the transport of photosynthetic products. The magnesium element has the function of improving the stress resistance (high illumination, high temperature, drought and the like) of crops, and resists the stress by maintaining the normal physiological metabolism of the crops. According to 2016 reports of the national center for agricultural technology popularization, 53% of the soil in China is in a magnesium deficiency state, and the China agricultural cultivation land needs to supplement magnesium element urgently.
In the age of agricultural high-speed development, people in the early period excessively pursue the improvement of yield and unit benefit, neglect the supplement of magnesium element to the land, make the agricultural products produced by us lose original flavor and nutrition because of the unbalanced absorption of soil element, because the agricultural products with nutrition defect enter the food chain, thus have caused various health problems brought by lack of nutrient element of human body, wherein there are dozens of kinds of related diseases caused by magnesium deficiency, wherein the most serious is cardiovascular disease, diabetes, hypertension, apoplexy, dyslipidemia, because magnesium deficiency can cause nervous system anxiety, depression, tension, insomnia, can also cause asthma, chronic obstructive pulmonary disease of respiratory system, because of magnesium deficiency can also cause the disorder of digestive system. Magnesium deficiency can also cause various arrhythmias such as ventricular premature beats, tachycardia. The magnesium deficiency can reduce protein synthesis, reduce collective resistance and immunologic function, and increase the incidence of tumor. The results of recent studies show that: most of us may lack magnesium. Therefore, there is a need to increase the magnesium content in agricultural products and food to promote health.
At present, granular magnesium fertilizer and sulfur magnesium fertilizer sold in the market are generally prepared by boric acid, borax industrial by-product or magnesium desulphurization by-product magnesium sulfate heptahydrate, brucite and the like through simple physical granulation, and the granular magnesium fertilizer or the sulfur magnesium fertilizer is poor in matching with other fertilizers, continuously provides nutrient elements for soil and crops in the middle and later periods before and after the crops grow, and is insufficient in available nutrient supply.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a high magnesium nitrogen potassium compound fertilizer for improving chlorophyll content, a preparation method thereof and a mineral source long-acting magnesium nitrogen potassium compound fertilizer.
The invention provides a high-magnesium nitrogen-potassium compound fertilizer which comprises, by weight, 40-80 parts of urea, 1-20 parts of other nitrogen fertilizers, 1-20 parts of potassium fertilizers and 5-40 parts of mineral magnesium, wherein the mineral magnesium contains magnesium and sulfur, and the dissolving speed of the mineral magnesium in water is smaller than that of the urea, the other nitrogen fertilizers and the potassium fertilizers in water.
Preferably, the mineral magnesium has the following characteristics:
when 1g of the solid matter is taken and dissolved in 250ml of tap water, the solid matter can not be completely dissolved after 24-48 h, and solid matter is remained in the water; or the like, or, alternatively,
when 1g of the water insoluble matter is dissolved in 250ml of tap water, the difference between the water insoluble matter content and the value of the water insoluble matter content measured at the initial time is 5-20 times after 48-96 h.
Preferably, the mineral magnesium comprises magnesium sulfate and other substances, and the other substances comprise one or more of magnesium oxide, pure magnesium, magnesium-free sulfate and chloride.
Preferably, the mineral magnesium comprises 79-99% of magnesium sulfate, 26.3-33% of magnesium oxide, 15.6-19.8% of pure magnesium, 1-6% of magnesium-free sulfate and less than 3% of chloride;
the magnesium-free sulfate comprises one or a combination of potassium sulfate, calcium sulfate and sodium sulfate; the chloride comprises one or two of potassium chloride and sodium chloride.
Preferably, the fertilizer comprises, by weight, 50-80 parts of urea, 3-15 parts of other nitrogen fertilizers, 3-15 parts of potash fertilizers and 15-40 parts of mineral magnesium, wherein the other nitrogen fertilizers are ammonium sulfate and/or ammonium chloride; the potash fertilizer is potassium chloride and/or potassium sulfate, and the specific gravity of the mineral magnesium is 300kg/m3-1550kg/m 3.
Preferably, in the mineral magnesium, substances with the particle size of 0.09mm-0.8mm account for more than 80 percent; and/or the substance with the granularity of 0.2mm-0.3mm accounts for more than 50 percent.
Preferably, the mineral magnesium is natural mineral magnesium obtained by extracting magnesium-containing ore by using an electrostatic separation technology.
Preferably, the preparation process of the mineral magnesium comprises the following steps:
crushing the magnesium-containing ore, performing surface active treatment in a fluidized bed, introducing the treated ore powder into an electrostatic separation device, performing electrostatic adsorption according to the difference of attached charges of different elements, collecting the adsorbed mineral elements after the adsorbed mineral elements fall freely to obtain mineral magnesium sulfate, removing impurities from the collected mineral magnesium sulfate, and drying and dehydrating to obtain the anhydrous or natural mineral magnesium.
The invention also provides a mineral source long-acting magnesium-nitrogen-potassium compound fertilizer which comprises the following components in parts by weight: 40-80 parts of urea, 1-20 parts of ammonium sulfate, 1-20 parts of potassium chloride and 5-40 parts of mineral magnesium, wherein the mineral magnesium contains magnesium element and sulfur element, the dissolving speed of the mineral magnesium in water is less than that of the urea, other nitrogen fertilizers and potassium fertilizers, and the ratio of the content of N, K, Mg to the content of S in the mineral source long-acting magnesium-nitrogen-potassium compound fertilizer is (25-35): (2-7): (1-5): (2-10).
The invention also provides a high tower granulation preparation method of the high magnesium nitrogen potassium compound fertilizer, which is characterized by comprising the following steps:
s1: proportioning raw materials; weighing raw materials in corresponding parts by weight;
s2: melting and stirring for reaction; adding urea and all or part of potash fertilizer into a melting tank, melting at high temperature, and uniformly stirring; then evenly overflowing and guiding the slurry uniformly stirred in the melting tank into a first-stage tank, adding the rest of potassium fertilizer, and uniformly stirring; then leading the slurry of the primary tank into a secondary tank at a constant speed, adding other nitrogen fertilizers and natural magnesium, stirring and reacting for 3-5 min, and keeping the slurry overflow at a constant speed to obtain overflow slurry uniformly stirred in the secondary tank; the temperature of the dissolving tank is 110-130 ℃; the temperature of the primary tank is 100-125 ℃; the temperature of the secondary tank is 90-115 ℃.
S3: emulsifying and mixing at high speed; introducing the overflow slurry into an emulsifying machine for high-speed mixing to obtain uniformly mixed slurry;
s4: granulating in a high tower; introducing the mixed slurry into a high tower granulator, and carrying out centrifugal shearing granulation to obtain granules;
s5: cooling and screening; cooling the granules obtained after high tower granulation by a primary cooler, screening, returning the granules out of specification to a primary tank, introducing the granules in accordance with the specification into a secondary cooler, and cooling to below 35 ℃ again to obtain secondary cooled granules;
s6: coating, conditioning and packaging; and (3) feeding the secondary cooled granules into a coating conditioning cylinder, spraying an anti-hardening agent in an atomizing manner, coating, spraying anti-hardening powder to obtain a finished compound fertilizer granule product with the granule diameter of 1.0-5.0 mm, conveying the finished compound fertilizer granule product to a finished product storage bin, metering, packaging and warehousing.
The high-magnesium nitrogen potassium compound fertilizer, the preparation method and the mineral source long-acting magnesium nitrogen potassium compound fertilizer provided by the invention can better improve the chlorophyll content.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the principles of the invention.
Fig. 1 is a schematic process flow diagram of a high tower granulation preparation method of a high magnesium nitrogen potassium compound fertilizer provided by embodiment 1 of the present invention.
Fig. 2 is a schematic process flow diagram of a high tower granulation preparation method of the high magnesium nitrogen potassium compound fertilizer provided by embodiment 2 of the invention.
Detailed Description
The technical solutions of the present invention are further described in detail with reference to specific examples so that those skilled in the art can better understand the present invention and can implement the present invention, but the examples are not intended to limit the present invention.
Referring to fig. 1-2, an embodiment of the present invention provides a high magnesium nitrogen potassium compound fertilizer, which includes, by weight, 40-80 parts of urea, 1-20 parts of other nitrogen fertilizers, 1-20 parts of potassium fertilizers, and 5-40 parts of mineral magnesium, where the mineral magnesium contains magnesium and sulfur, and the dissolution rate of the mineral magnesium in water is less than that of the urea, the other nitrogen fertilizers, and the potassium fertilizers in water. Wherein the mineral magnesium contains more than 5% of water-insoluble substances, wherein the water-insoluble substances are defined in the standard of water soluble fertilizers and do not mean complete insolubility in water. The mineral magnesium may be completely water soluble when the dissolution time is long enough, e.g. 4-5 days.
The mineral magnesium provided by the embodiment has good stability and has the following characteristics:
when 1g of the powder is dissolved in 250ml of tap water, the powder cannot be completely dissolved after 24-48 h, and solid matters are remained in the water; or the like, or, alternatively,
when 1g of the water insoluble matter is dissolved in 250ml of tap water, the difference between the water insoluble matter content and the value of the water insoluble matter content measured at the initial time is 5-20 times after 48-96 h. Wherein, the content of the water-insoluble substances is determined by the water-insoluble substance determination method specified in the national standard NYT 1973-2010 determination standard of the content and the pH value of the water-soluble fertilizer.
The specific test method comprises the following steps: 2 parts of sample are weighed and respectively placed in a beaker, 250ml of tap water is respectively added, and the mixture is fully stirred for 3 min. After 0 h and 48h to 96h, respectively, the water-insoluble content was determined as follows: filtering with a glass crucible type filter which is dried in a drying oven at (110 +/-2) DEG C to constant weight in advance, transferring all residues into the filter with water as little as possible, placing the filter with the residues into the drying oven at (110 +/-2) DEG C, drying for 1h after the temperature reaches 110 ℃, taking out, transferring into a dryer, cooling to room temperature, and weighing.
The high-magnesium nitrogen potassium compound fertilizer provided by the embodiment of the invention is suitable for being used as top dressing, is particularly suitable for top dressing of leaf vegetables, has the characteristics of high nitrogen and low potassium according to the requirement of plants on nutrition, realizes the supplement of nitrogen and potassium elements and magnesium and sulfur elements for crops in the top dressing process, realizes the combined action of major elements and secondary elements, provides sufficient nutrients for the crops in the top dressing process, and has the long-acting and slow-release effect.
The high-magnesium nitrogen potassium compound fertilizer provided by the embodiment of the invention has mineral magnesium, has a slow dissolving speed in water, can better avoid loss of magnesium element, and has a long-acting slow-release effect.
The high-magnesium nitrogen potassium compound fertilizer provided by the embodiment of the invention has the mineral magnesium, is good in stability, is not easy to react with urea, is good in slurry fluidity, can be well prepared into granules, ensures nutrient components, and improves the production efficiency of fertilizer granules.
The high-magnesium nitrogen potassium compound fertilizer provided by the embodiment of the invention contains mineral magnesium, has magnesium element, is slow in dissolution, has a slow release effect, can improve the chlorophyll content and promote the transportation of photosynthetic products, and has the function of better improving the stress resistance of crops.
The high-magnesium nitrogen potassium compound fertilizer provided by the embodiment of the invention can obviously relieve yellow leaves caused by magnesium deficiency after being used, promote photosynthesis and improve metabolic disturbance caused by magnesium deficiency, so that crops can quickly recover growth, and the crop loss caused by magnesium deficiency is reduced.
The high-magnesium nitrogen potassium compound fertilizer provided by the embodiment of the invention can relieve the absorption obstacle and element absorption imbalance of soil caused by acid-base imbalance, effectively relieve the root system absorption condition of acid soil, and enlarge and prolong the root system growth range, thereby improving the utilization rate of the fertilizer, reducing the fertilizer residue of the soil and improving the quality and yield of crops.
The high-magnesium nitrogen potassium compound fertilizer provided by the embodiment of the invention can adapt to any use environment, is friendly to the soil environment and has stronger repairing effect on the soil fertility.
The high-magnesium nitrogen potassium compound fertilizer provided by the embodiment of the invention has good physical and chemical properties, is quick-acting and slow-release combined, is efficient and convenient, can be applied by various methods, and is a novel fertilizer capable of meeting the development requirements of intelligent agriculture.
The high-magnesium nitrogen potassium compound fertilizer provided by the embodiment of the invention contains mineral magnesium with good stability, is not easy to react with urea to cause slurry to be viscous, is easy to granulate, form and continuously produce, and has stable effective components.
The high-magnesium nitrogen potassium compound fertilizer provided by the embodiment of the invention ensures that the chlorophyll content of the product is effectively improved in the crop planting process, the magnesium content of agricultural products is enriched, the flavor and the taste of the agricultural products are improved, the effects of obviously increasing the yield and improving the economic value of the agricultural products are achieved, meanwhile, the fertilizer utilization rate is improved, the soil fertilizer pollution is reduced, the soil is conditioned, the agricultural planting cost investment is further saved, the agricultural economic benefit is generally improved, and the high-magnesium nitrogen potassium compound fertilizer has good economic benefit and environmental benefit.
In a preferred embodiment, the mineral magnesium has a dissolution time in water which is 10-150 times the dissolution time of the same mass of urea, other nitrogen and potassium fertilizers in the same volume of water. In a further preferred embodiment, the mineral magnesium has a dissolution time in water which is 20 times, 30 times, 40 times, 50 times, 60 times, 70 times, 80 times, 90 times, 100 times or 110 times the dissolution time of the same mass of urea, other nitrogen and potassium fertilizers in the same volume of water.
For example: when 1g of urea, other nitrogen fertilizers or potassium fertilizers are weighed and dissolved in 250ml of tap water, the urea, other nitrogen fertilizers or potassium fertilizers are completely dissolved after 1 hour; 1g of mineral magnesium was dissolved in 250ml of tap water, which took 10-150 hours to dissolve completely.
In a preferred embodiment, the mineral magnesium is: contains magnesium element and sulfur element, and when 0.5-2 g of the magnesium element and sulfur element are dissolved in 400-600 ml of water, the magnesium element and sulfur element can not be completely dissolved after 48-72 h, solid matters are remained in the water, and the solid matters contain substances with the granularity of more than 0.01 mm. The mineral magnesium selected in the embodiment is natural mineral magnesium obtained by extracting magnesium-containing ore by utilizing an electrostatic separation technology through Shenzhen Shendekali salt trade Limited company or Germany sylvite group company. It has the characteristics of good stability and difficult dissolution. The high temperature is not easy to react with urea, and the compound fertilizer can be prepared by using modern high towers and other processes.
In a preferred embodiment, the mineral magnesium comprises magnesium sulfate and other substances including one or more of magnesium oxide, pure magnesium, magnesium-free sulfate and chloride. The mineral magnesium provided by the embodiment contains other magnesium-containing elements and magnesium-free sulfate besides magnesium sulfate, and can better supplement magnesium and sulfur for crops.
In a preferred embodiment, the mineral magnesium contains more than 80% of substances with the particle size of 0.09mm-0.8 mm; and/or the substance with the granularity of 0.2mm-0.3mm accounts for more than 50 percent.
In a preferred embodiment, the physicochemical indexes of the mineral magnesium are:
the magnesium sulfate accounts for 79-99% by mass, the magnesium oxide accounts for 26.3-33% by mass, the pure magnesium accounts for 15.6-19.8% by mass, the magnesium sulfate contains 1-6% by mass of sulfate which does not contain magnesium element and chloride which does not exceed 3% by mass, the proportion of substances with the particle size of 0.09-0.8 mm is more than 80% and the proportion of substances with the particle size of 0.3mm is more than 50%, and the specific gravity is 1300 kg/m3-1550kg/m 3.
In a preferred embodiment, the magnesium-free sulfate containing no magnesium element comprises one or a combination of potassium sulfate, calcium sulfate and sodium sulfate; the chloride comprises one or two of potassium chloride and sodium chloride.
In a preferred embodiment, the fertilizer comprises, by weight, 50-80 parts of urea, 3-15 parts of other nitrogen fertilizers, 3-15 parts of potash fertilizers and 10-30 parts of mineral magnesium, wherein the other nitrogen fertilizers are ammonium sulfate and/or ammonium chloride; the potash fertilizer is potassium chloride and/or potassium sulfate.
In a preferred embodiment, the mineral magnesium is the natural mineral magnesium obtained by extraction in magnesium-containing ores using electrostatic separation techniques.
In a preferred embodiment, the preparation process of the mineral magnesium comprises the following steps:
crushing the magnesium-containing ore, performing surface active treatment in a fluidized bed, introducing the treated ore powder into an electrostatic separation device, performing electrostatic adsorption according to the difference of attached charges of different elements, collecting the adsorbed mineral elements after the adsorbed mineral elements fall freely to obtain mineral magnesium sulfate, removing impurities from the collected mineral magnesium sulfate, and drying and dehydrating to obtain the anhydrous or natural mineral magnesium.
The embodiment of the invention also provides a mineral source long-acting magnesium-nitrogen-potassium compound fertilizer which is characterized by comprising the following components in parts by weight: 40-80 parts of urea, 1-20 parts of ammonium sulfate, 1-20 parts of potassium chloride and 5-40 parts of mineral magnesium, wherein the mineral magnesium contains magnesium element and sulfur element, the dissolving speed of the mineral magnesium in water is less than that of the urea, other nitrogen fertilizers and potassium fertilizers, and the ratio of the content of N, K, Mg to the content of S in the mineral source long-acting magnesium-nitrogen-potassium compound fertilizer is (25-35): (2-7): (1-5): (2-10).
In a preferred embodiment, the nitrogen content of the urea is more than or equal to 46 percent; the nitrogen content in the ammonium sulfate is more than or equal to 21 percent, and the sulfur content is more than or equal to 24 percent; the content of potassium oxide in the potassium chloride is more than or equal to 60 percent; in the mineral magnesium, the content of magnesium is more than or equal to 15.5 percent, and the content of sulfur is more than or equal to 25 percent.
The embodiment of the invention also provides a high tower granulation preparation method of the high magnesium nitrogen potassium compound fertilizer, which comprises the following steps:
s1: proportioning raw materials; weighing the raw materials of the components in any embodiment;
s2: melting and stirring for reaction; adding urea and all or part of potash fertilizer into a melting tank, melting at high temperature, and uniformly stirring; then evenly overflowing and guiding the slurry uniformly stirred in the melting tank into a first-stage tank, adding the rest of potassium fertilizer, and uniformly stirring; then leading the slurry of the primary tank into a secondary tank at a constant speed, adding other nitrogen fertilizers and natural magnesium, stirring and reacting for 3-5 min, and keeping the slurry overflow at a constant speed to obtain overflow slurry uniformly stirred in the secondary tank; the temperature of the dissolving tank is 110-130 ℃; the temperature of the primary tank is 100-125 ℃; the temperature of the secondary tank is 90-115 ℃.
S3: emulsifying and mixing at high speed; introducing the overflow slurry into an emulsifying machine for high-speed mixing to obtain uniformly mixed slurry;
s4: granulating in a high tower; introducing the mixed slurry into a high tower granulator, and carrying out centrifugal shearing granulation to obtain granules;
s5: cooling and screening; cooling the granules obtained after high tower granulation by a primary cooler, screening, returning the granules out of specification to a primary tank, introducing the granules in accordance with the specification into a secondary cooler, and cooling to below 35 ℃ again to obtain secondary cooled granules;
s6: coating, conditioning and packaging; and (3) feeding the secondary cooled granules into a coating conditioning cylinder, spraying an anti-hardening agent in an atomizing manner, coating, spraying anti-hardening powder to obtain a finished compound fertilizer granule product with the granule diameter of 1.0-5.0 mm, conveying the finished compound fertilizer granule product to a finished product storage bin, metering, packaging and warehousing.
The high-magnesium nitrogen potassium compound fertilizer provided by the embodiment of the invention is suitable for high-tower granulation preparation. The selected mineral magnesium has good stability, is not easy to dissolve at high temperature, and is not easy to react with urea to cause slurry thickening, so that the preparation of high tower granulation is facilitated, the obtained fertilizer particles have good appearance, the mineral magnesium is low in dissolving speed and not easy to lose, and the fertilizer has good fertilizer efficiency.
In order to further understand and appreciate the technical solution of the present invention, the embodiments are now described in further detail.
Example 1
(1) Raw material metering: 63 parts of urea; 8 parts of ammonium phosphate; 9 parts of potassium chloride; and 20 parts of magnesium sulfate.
In the urea, the nitrogen content is 46 percent, and the urea is obtained by market purchase;
in the ammonium sulfate, the nitrogen content is 21 percent, and the sulfur content is 24 percent;
in the potassium chloride, the content of potassium oxide is 60%;
in the mineral magnesium, the magnesium content is 15.5%, and the sulfur content is 25%.
The mineral magnesium is natural mineral magnesium extracted from collected potassium magnesium ore by utilizing electrostatic separation technology by Shenzhen Shendekali salt trade Limited company or Germany sylvite group company.
(2) Melting and stirring reaction: adding 63 parts of 46% urea and 5 parts of 62% potassium chloride into a melting tank, melting at a high temperature of 130 ℃, and uniformly stirring for 10 minutes; overflowing the uniformly stirred slurry at a constant speed into a first-stage tank, adding 4 parts of 62% potassium chloride, keeping the temperature at 115 ℃, and uniformly stirring for 10 minutes; and (3) introducing the slurry of the first-stage tank into a second-stage tank through uniform overflow, adding 8 parts of ammonium sulfate and 20 parts of mineral magnesium (natural magnesium), keeping the temperature at 110 ℃, stirring to react for 3 minutes, and keeping the slurry to overflow at a uniform speed.
(3) High-speed emulsification and mixing: and (3) guiding the overflow molten slurry uniformly stirred in the secondary tank into an emulsifying machine for high-speed emulsification and mixing, keeping 1450 revolutions per minute to further uniform the slurry, and keeping the temperature at 110 ℃.
(4) High tower granulation: and (4) introducing the uniformly mixed slurry into a granulator, and carrying out centrifugal shearing granulation.
(5) And (3) cooling: collecting the high-altitude free falling crystal primary cooling particles, and feeding the particles into a cooling machine for primary cooling.
(6) Screening: and screening the first stage cooled particles, and returning the particles which do not meet the specification to the first stage reaction tank.
(7) Secondary cooling: and (4) introducing the screened particles into a secondary cooler, and carrying out secondary cooling to below 35 ℃.
(8) And (3) conditioning the envelope: and (3) metering the cooled and screened particles, guiding the particles into a coating conditioning cylinder, controlling the anti-hardening agent by using a mass flow meter, atomizing and spraying the anti-hardening agent by using compressed air, wrapping for 1 minute, measuring the anti-hardening powder by using a screw feeder in a variable frequency manner, coating for 3-5 minutes, and uniformly mixing.
(10) Metering and packaging: and (5) automatically metering and packaging the finished product by using a finished product packaging scale.
(11) And (6) warehousing the finished product.
The N-P-K-Mg-S content in the prepared mineral source long-acting magnesium-nitrogen-potassium compound fertilizer product is 30-0-5-3-6. The grain diameter of the compound fertilizer is 1.5-4.5 mm.
Example 2
(1) Raw material metering: 63 parts of urea; 8 parts of ammonium phosphate; 9 parts of potassium chloride; and 20 parts of magnesium sulfate.
In the urea, the nitrogen content is 46 percent, and the urea is obtained by market purchase;
in the ammonium sulfate, the nitrogen content is 21 percent, and the sulfur content is 24 percent;
in the potassium chloride, the content of potassium oxide is 60%;
in the mineral magnesium, the magnesium content is 15.5%, and the sulfur content is 25%.
The mineral magnesium is natural mineral magnesium extracted from collected potassium magnesium ore by utilizing electrostatic separation technology by Shenzhen Shendekali salt trade Limited company or Germany sylvite group company.
(2) Melting and stirring reaction: adding 63 parts of 46% urea and 9 parts of 62% potassium chloride into a melting tank, melting at a high temperature of 130 ℃, and uniformly stirring for 10 minutes; and (2) overflowing the uniformly stirred slurry into a primary tank at a constant speed, keeping the temperature at 115 ℃, overflowing the slurry in the primary tank at a constant speed into a secondary tank, adding 8 parts of ammonium sulfate and 20 parts of mineral magnesium (natural magnesium), keeping the temperature at 110 ℃, stirring to react for 3 minutes, and keeping the slurry overflowing at a constant speed.
(3) High-speed emulsification and mixing: and (3) guiding the overflow molten slurry uniformly stirred in the secondary tank into an emulsifying machine for high-speed emulsification and mixing, keeping 1450 revolutions per minute to further uniform the slurry, and keeping the temperature at 110 ℃.
(4) High tower granulation: and (4) introducing the uniformly mixed slurry into a granulator, and carrying out centrifugal shearing granulation.
(5) And (3) cooling: collecting the high-altitude free falling crystal primary cooling particles, and feeding the particles into a cooling machine for primary cooling.
(6) Screening: and screening the first stage cooled particles, and returning the particles which do not meet the specification to the first stage reaction tank.
(7) Secondary cooling: and (4) introducing the screened particles into a secondary cooler, and carrying out secondary cooling to below 35 ℃.
(8) And (3) conditioning the envelope: and (3) metering the cooled and screened particles, guiding the particles into a coating conditioning cylinder, controlling the anti-hardening agent by using a mass flow meter, atomizing and spraying the anti-hardening agent by using compressed air, wrapping for 1 minute, measuring the anti-hardening powder by using a screw feeder in a variable frequency manner, coating for 3-5 minutes, and uniformly mixing.
(10) Metering and packaging: and (5) automatically metering and packaging the finished product by using a finished product packaging scale.
(11) And (6) warehousing the finished product.
The N-P-K-Mg-S content in the prepared mineral source long-acting magnesium-nitrogen-potassium compound fertilizer product is 30-0-5-3-6. The grain diameter of the compound fertilizer is 1.5-4.5 mm.
Comparative example 1
The conventional nitrogen fertilizer uses Boda urea fertilizer, the main component of which is urea, and the total nitrogen content is 46.4 (%).
Comparative example 2
In comparison with example 1, in comparative example 2, the mineral source magnesium was replaced with magnesium sulfate heptahydrate produced from a Nanfeng group, and the remaining formulation and preparation method were the same as in example 1. The content of the magnesium sulfate heptahydrate is more than or equal to 99 percent, and when 1g of the magnesium sulfate heptahydrate is dissolved in 250ml of tap water, the magnesium sulfate heptahydrate is completely dissolved after 1 hour.
Effects of the embodiment
The compound fertilizer prepared in the embodiments 1-2, the urea fertilizer prepared in the comparative example 1 and the compound fertilizer prepared in the comparative example 2 are respectively used for planting in different areas and different crops.
First set of tests
And (3) planting area: white cloud region of Guangzhou city
Planting crops: heart of vegetable
The method comprises the following steps of dividing the cultivation area into 4 groups, planting 10 rows in each group, planting 20 meters in each row, planting 55 Chinese cabbage seeds in each row, applying the same base fertilizer before planting, wherein the base fertilizer mainly comprises decomposed organic fertilizer and farmyard manure, applying 80-100 kg of organic fertilizer to each mu of land, and performing flushing fertilization and topdressing on the compound fertilizer prepared in the embodiment 1-2, the urea fertilizer prepared in the comparative example 1 and the compound fertilizer prepared in the comparative example 2 by adding 800 times of water in each group of cultivation area in the seedling stage, the leaf growing stage and the later growth stage of the Chinese cabbage seeds.
Second set of tests
And (3) planting area: haikou city of Hainan province
Planting crops: celery
The method is divided into 4 groups of planting areas, wherein 10 rows of planting areas are planted in each group, each row is 20 meters, and 100 celery plants can be planted in each row.
The same planting management is adopted in 4 groups of planting areas, and the same base fertilizer is applied before planting.
The planting method comprises the following steps: and (3) land preparation and fertilization, namely, 6000 kilograms of decomposed ring fertilizer, 50 kilograms of calcium superphosphate, 25 kilograms of ammonium bicarbonate and 4 kilograms of zinc sulfate are uniformly spread on the ground surface 1 week before field planting, and the soil is ploughed once with the depth of 20 centimeters. When the seedlings grow to 5-6 leaves, the seedlings can be planted. After field planting, topdressing is carried out on each group of planting areas respectively by the compound fertilizer prepared in examples 1-2, the urea fertilizer prepared in comparative example 1 and the compound fertilizer prepared in comparative example 2 for 3 times, and 10 kilograms of topdressing amount is applied along with water per mu.
Third set of experiments
And (3) planting area: xuan city of Anhui province
Planting crops: shanghai Qing tea
The method is divided into 4 groups of planting areas, wherein 10 rows of 20 meters are planted in each group of planting areas, and 55 celery plants can be planted in each row. The same planting management is adopted in the 4 groups of planting areas, the same base fertilizer is applied before planting, topdressing is carried out once after planting for one week, and the topdressing is carried out for 3 times and then the harvest period is carried out. The topdressing amount is 10 kilograms per mu along with water.
Recording the chlorophyll content of crops after the compound fertilizer prepared in examples 1-2, the urea fertilizer prepared in comparative example 1 and the compound fertilizer prepared in comparative example 2 are applied in the three tests; specific numerical values are shown in table 1.
TABLE 1
In the three sets of tests described above, the chlorophyll content of the compound fertilizers prepared in examples 1-2 and the compound fertilizers prepared in comparative example 2 were recorded to be increased relative to the crop on which the urea of comparative example 1 was applied. Specific numerical values are shown in table 2.
TABLE 2
The yield of the compound fertilizer prepared in examples 1-2 and the compound fertilizer prepared in comparative example 2 was recorded for the three sets of experiments described above in relation to the crop to which the urea of comparative example 1 was applied. Specific numerical values are shown in table 3.
TABLE 3
As can be seen from the data in tables 1-3, the compound fertilizer provided by the invention is suitable for soil conditions and various crops in various countries, the chlorophyll content is greatly improved, compared with the existing nitrogen fertilizer, the chlorophyll content is increased by more than 35%, and the yield is increased by more than 17%. Comparative example 2 compared to the present invention, the conventional magnesium sulfate heptahydrate was used as a magnesium source, and the chlorophyll content and yield were increased less.
In the three test processes, the crops applied in the embodiments 1-2 are observed to show the continuous enhancement of the growth vigor in the middle and later periods, and the characteristics of yield increase, leaf color and bright color of agricultural products are uniformly shown. The composite fertilizer provided by the invention can better improve the chlorophyll content of crops and the yield of the crops, and has considerable economic value.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The high-magnesium nitrogen-potassium compound fertilizer is characterized by comprising, by weight, 40-80 parts of urea, 1-20 parts of other nitrogen fertilizers, 1-20 parts of potassium fertilizers and 5-40 parts of mineral magnesium, wherein the mineral magnesium contains magnesium and sulfur, and the dissolving speed of the mineral magnesium in water is lower than that of the urea, the other nitrogen fertilizers and the potassium fertilizers in water.
2. The high-magnesium nitrogen-potassium compound fertilizer as claimed in claim 1, wherein the dissolution time of the mineral magnesium in water is 10-150 times of the dissolution time of the same mass of the urea, other nitrogen fertilizers and potassium fertilizers in the same volume of water.
3. The high-magnesium nitrogen-potassium compound fertilizer as claimed in claim 1, wherein the mineral magnesium has the following characteristics:
when 1g of the solid matter is taken and dissolved in 250ml of tap water, the solid matter can not be completely dissolved after 24-48 h, and solid matter is remained in the water; or the like, or, alternatively,
when 1g of the water insoluble matter is dissolved in 250ml of tap water, the difference between the water insoluble matter content and the value of the water insoluble matter content measured at the initial time is 5-20 times after 48-96 h.
4. The high-magnesium nitrogen-potassium compound fertilizer as claimed in claim 1, wherein the mineral magnesium comprises magnesium sulfate and other substances, and the other substances comprise one or more of magnesium oxide, pure magnesium, and sulfate and chloride without magnesium.
5. The high-magnesium nitrogen-potassium compound fertilizer as claimed in claim 1, wherein the mineral magnesium comprises 79 to 99 mass percent of magnesium sulfate, 26.3 to 33 mass percent of magnesium oxide, 15.6 to 19.8 mass percent of pure magnesium, 1 to 6 mass percent of magnesium-free sulfate and less than 3 mass percent of chloride;
the magnesium-free sulfate comprises one or a combination of potassium sulfate, calcium sulfate and sodium sulfate; the chloride comprises one or two of potassium chloride and sodium chloride.
6. The high-magnesium nitrogen-potassium compound fertilizer as claimed in claim 1, characterized in that 50-80 parts of urea, 3-15 parts of other nitrogen fertilizers, 3-15 parts of potassium fertilizers and 15-40 parts of mineral magnesium are calculated by weight, and the other nitrogen fertilizers are ammonium sulfate and/or ammonium chloride; the potash fertilizer is potassium chloride and/or potassium sulfate, and the specific gravity of the mineral magnesium is 300kg/m3-1550kg/m3；
In the mineral magnesium, the content of substances with the granularity of 0.09mm-0.8mm is more than 80%; and/or the substance with the granularity of 0.2mm-0.3mm accounts for more than 50 percent.
7. The high-magnesium nitrogen-potassium compound fertilizer as claimed in claim 1, wherein the mineral magnesium is natural mineral magnesium extracted from magnesium-containing ores by using an electrostatic separation technology.
8. The high-magnesium nitrogen-potassium compound fertilizer as claimed in claim 1, wherein the preparation process of the mineral magnesium is as follows:
crushing the magnesium-containing ore, performing surface active treatment in a fluidized bed, introducing the treated ore powder into an electrostatic separation device, performing electrostatic adsorption according to the difference of attached charges of different elements, collecting the adsorbed mineral elements after the adsorbed mineral elements fall freely to obtain mineral magnesium sulfate, removing impurities from the collected mineral magnesium sulfate, and drying and dehydrating to obtain the anhydrous or natural mineral magnesium.
9. The long-acting magnesium-nitrogen-potassium compound fertilizer for mineral sources is characterized by comprising the following components in parts by weight: 40-80 parts of urea, 1-20 parts of ammonium sulfate, 1-20 parts of potassium chloride and 5-40 parts of mineral magnesium, wherein the dissolving speed of the mineral magnesium in water is less than that of the urea, other nitrogen fertilizers and potassium fertilizers, and the ratio of N, K, Mg to S in the long-acting mineral magnesium-nitrogen-potassium compound fertilizer is (25-35): (2-7): (1-5): (2-10).
10. The high tower granulation preparation method of high magnesium nitrogen potassium compound fertilizer as claimed in any one of claims 1 to 8, characterized by comprising the following steps:
s1: proportioning raw materials; weighing raw materials in corresponding parts by weight;
s2: melting and stirring for reaction; adding urea and all or part of potash fertilizer into a melting tank, melting at high temperature, and uniformly stirring; then evenly overflowing and guiding the slurry uniformly stirred in the melting tank into a first-stage tank, adding the rest of potassium fertilizer, and uniformly stirring; then leading the slurry of the primary tank into a secondary tank at a constant speed, adding other nitrogen fertilizers and natural magnesium, stirring and reacting for 3-5 min, and keeping the slurry overflow at a constant speed to obtain overflow slurry uniformly stirred in the secondary tank; the temperature of the dissolving tank is 110-130 ℃; the temperature of the primary tank is 100-125 ℃; the temperature of the secondary tank is 90-115 ℃.
S3: emulsifying and mixing at high speed; introducing the overflow slurry into an emulsifying machine for high-speed mixing to obtain uniformly mixed slurry;
s4: granulating in a high tower; introducing the mixed slurry into a high tower granulator, and carrying out centrifugal shearing granulation to obtain granules;
s5: cooling and screening; cooling the granules obtained after high tower granulation by a primary cooler, screening, returning the granules out of specification to a primary tank, introducing the granules in accordance with the specification into a secondary cooler, and cooling to below 35 ℃ again to obtain secondary cooled granules;
s6: coating, conditioning and packaging; and (3) feeding the secondary cooled granules into a coating conditioning cylinder, spraying an anti-hardening agent in an atomizing manner, coating, spraying anti-hardening powder to obtain a finished compound fertilizer granule product with the granule diameter of 1.0-5.0 mm, conveying the finished compound fertilizer granule product to a finished product storage bin, metering, packaging and warehousing.
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