WO2021152571A1 - Granules of polyhalite and urea and a compaction process for the production thereof - Google Patents
Granules of polyhalite and urea and a compaction process for the production thereof Download PDFInfo
- Publication number
- WO2021152571A1 WO2021152571A1 PCT/IL2020/051335 IL2020051335W WO2021152571A1 WO 2021152571 A1 WO2021152571 A1 WO 2021152571A1 IL 2020051335 W IL2020051335 W IL 2020051335W WO 2021152571 A1 WO2021152571 A1 WO 2021152571A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- granule
- urea
- polyhalite
- particles
- binder
- Prior art date
Links
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000008187 granular material Substances 0.000 title claims abstract description 50
- 239000004202 carbamide Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims description 15
- 238000005056 compaction Methods 0.000 title claims description 11
- 238000004519 manufacturing process Methods 0.000 title description 9
- 239000011230 binding agent Substances 0.000 claims abstract description 17
- 239000002245 particle Substances 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- 238000012216 screening Methods 0.000 claims description 7
- 229920001732 Lignosulfonate Polymers 0.000 claims description 4
- 239000004117 Lignosulphonate Substances 0.000 claims description 3
- 229920002472 Starch Polymers 0.000 claims description 3
- 235000019357 lignosulphonate Nutrition 0.000 claims description 3
- 239000008107 starch Substances 0.000 claims description 3
- 235000019698 starch Nutrition 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 26
- 235000013877 carbamide Nutrition 0.000 description 22
- 239000003337 fertilizer Substances 0.000 description 19
- 229910052757 nitrogen Inorganic materials 0.000 description 13
- 238000000576 coating method Methods 0.000 description 8
- 239000000428 dust Substances 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 6
- 235000015097 nutrients Nutrition 0.000 description 6
- 238000013270 controlled release Methods 0.000 description 5
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 230000008635 plant growth Effects 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 3
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 3
- 239000001166 ammonium sulphate Substances 0.000 description 3
- 235000011130 ammonium sulphate Nutrition 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- 230000012010 growth Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 3
- 239000004115 Sodium Silicate Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 235000021073 macronutrients Nutrition 0.000 description 2
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011785 micronutrient Substances 0.000 description 2
- 235000013369 micronutrients Nutrition 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- -1 prills Substances 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 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 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 239000004111 Potassium silicate Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- 229930006000 Sucrose Natural products 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- QVTHQHKCUIVKDX-UHFFFAOYSA-M azanium calcium nitrate sulfate Chemical compound [NH4+].[Ca+2].[O-][N+]([O-])=O.[O-]S([O-])(=O)=O QVTHQHKCUIVKDX-UHFFFAOYSA-M 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004720 fertilization Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000010442 halite Substances 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000002015 leaf growth Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 235000013379 molasses Nutrition 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- 229910052913 potassium silicate Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 230000005082 stem growth Effects 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000013268 sustained release Methods 0.000 description 1
- 239000012730 sustained-release form Substances 0.000 description 1
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 230000017260 vegetative to reproductive phase transition of meristem Effects 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- 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
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
- C05C9/005—Post-treatment
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D3/00—Calcareous fertilisers
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D5/00—Fertilisers containing magnesium
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D9/00—Other inorganic fertilisers
- C05D9/02—Other inorganic fertilisers containing trace elements
Definitions
- the present invention relates to the field of composite fertilizers, specifically to production of a compacted polyhahte and urea fertilizer.
- plants need nutrients (nitrogen, potassium, calcium, zinc, magnesium, iron, manganese, etc.) which normally can be found in the soil.
- nutrients nitrogen, potassium, calcium, zinc, magnesium, iron, manganese, etc.
- fertilizers are needed to achieve a desired plant growth as these can enhance the growth of plants.
- Fertilizers typically provide, in varying proportions, three main macronutrients:
- Potassium (K) Strong stem growth, movement of water in plants, promotion of flowering and fruiting; three secondary macronutrients: calcium (Ca), magnesium (Mg), and Sulphur (S); micronutrients: copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo), zinc (Zn), boron (B), and of occasional significance there are silicon (Si), cobalt (Co), and vanadium (V) plus rare mineral catalysts.
- the most reliable and effective way to make the availability of nutrients coincide with plant requirements is by controlling their release into the soil solution, using slow release or controlled release fertilizers.
- slow release fertilizers SRF
- controlled release fertilizers CRF
- slow release fertilizers and controlled release fertilizers differ in many ways: The technology they use, the release mechanism, longevity, release controlling factors and more.
- Solid fertilizers include granules, prills, crystals and powders.
- a prilled fertilizer is a type of granular fertilizer that is nearly spherical made by solidifying free-falling droplets in air or a fluid medium.
- Most controlled- release fertilizers (CRFs) used in commercial nurseries are prilled fertilizers that have been coated with sulfur or a polymer.
- Polyhalite is an evaporite mineral, a hydrated sulfate of potassium, calcium and magnesium with formula: K 2 Ca2Mg(S0 4 ) 4 2H 2 O. Polyhahte is used as a fertilizer since it contains four important nutrients and is low in chloride:
- Nitrogen is essential component for the plant. N containing fertilizers like Urea, ammonium nitrate, ammonium sulphate calcium nitrate and Magnesium nitrate are useful for the plant's growth.
- Urea also known as carbamide, is an organic compound with chemical formula CO(NH 2 ) 2 .
- Polyhalite and urea although both useful for the proper growth of a plant are practically un-mixable due to urea is considered a ductile material, and polyhahte is a mined non-ductile substance. From a chemical point of view it is extremely difficult of cause the adherence of these two substances without using shear force as these are both solids.
- the concentration of polyhahte in the granule may be in a range between 20-80% w/w, preferably, between 30- 70% w/w, most preferably between 40-60% w/w.
- a process for the compaction of Polyhahte with a urea comprising: mixing a feed of polyhahte with a feed of urea and optionally a binder in a mixer to yield a mixture; compacting in a compactor to yield masses; crushing said masses in a crusher to yield particles; and screening said particles in a screener to yield different particles in three different sizes: oversized particles which undergo a second crushing process and are retuned to said screener for screening, undersized particles which are transferred to said mixer for further mixing, and desired size granular particles which are transferred to a polish screener.
- a granule of polyhalite and urea there is provided herein a granule of polyhalite and urea.
- plants need nitrogen to grow, develop and produce usable products. Since plants get their nitrogen from the soil, farmers must replenish nitrogen to ensure successful growth and to replace nitrogen removed in the harvested crop. When plants are not provided with sufficient nitrogen, they become nitrogen deficient. Plants with nitrogen deficiency often have spindly stems and their growth is stunted.
- NUE Nitrogen use efficiency
- the unique combination of polyhalite and urea in a single compacted granule allows for the NUE to be increased, e.g., without increasing the amount of fertilizer provided to the plants.
- the concentration of polyhahte in the granule may be in a range between 20-80% w/w, preferably, between 30- 70% w/w, most preferably between 40-60% w/w.
- a process for the compaction of Polyhalite with a urea comprising: mixing a feed of polyhalite with a feed of urea and optionally a binder in a mixer to yield a mixture; compacting in a compactor to yield masses; crushing said masses in a crusher to yield particles; and screening said particles in a screener to yield different particles in three different sizes: oversized particles which undergo a second crushing process and are retuned to said screener for screening, undersized particles which are transferred to said mixer for further mixing, and desired size granular particles which are transferred to a polish screener.
- the final product contain: N,K,S,MgO,CaO
- the mixture for the compactor may contain 50-70% w/w of Polyhalite, 20- 50% w/w of Urea and optionally a binder.
- the mixing may be performed in a blade blender and/or any other suitable devise capable of having a rotation speed that creates a swirling motion for a perfect homogenization and a high blending precision, e.g., a Ploughshare ® Mixer.
- the compaction may be a wet compaction.
- the compaction process may include the addition of a binder 1-5% binder.
- the binder may include but not limited : for example, organic or inorganic binders, such as, starch, bentonite, sodium silicate, lignosulfonates, molasses, hydrated hme, bitumen, Portland cement, clay, acids, cellulose gum, sucrose, water, water glass, cements, Fly Ash, Potassium and Sodium Silicate, MgO, CaO, Alganite, Geo-polymers, oils and waxesand the like, or a combination thereof.
- organic or inorganic binders such as, starch, bentonite, sodium silicate, lignosulfonates, molasses, hydrated hme, bitumen, Portland cement, clay, acids, cellulose gum, sucrose, water, water glass, cements, Fly Ash, Potassium and Sodium Silicate, MgO, CaO, Alganite, Geo-polymers, oils and waxesand the
- the dry compaction process may include the following steps:
- the mixture may be heated to a temperature between 80-180 °C, preferably 160°C.
- the flakes (also referred to herein as “particles” or “granules”) is between 1-6 mm, most preferably between 2-4 mm.
- Oversized (OS) flakes - are returned to the grinding stage, e.g., between 4-20% w/w of the total resulting flakes.
- Undersized (US) flakes - are recycled to the mixture for compaction, e.g., between 10 to 80% w/w of the total resulting flakes.
- a binder in the dry process, optionally a binder may be added in a concentration of between 0.01-7% w/w, preferably between 1- 5% w/w, most preferably between 2-4% w/w.
- the final product may submitted to post-treatment oil may be added to the resulting granules, e.g., to improve the rheology of the product and diminish dust formation. Polishing the granules or Coating. The resulting flakes/granules may be glazed and further coated with a suitable coating.
- the coatings may include biodegradable coatings, sustained release coatings, controlled release coatings, oily coatings, wax coatings.
- the dry compaction process may include the following steps:
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Fertilizers (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
There is provided herein a granule comprising polyhalite in a concentration of between 20-80% w/w and urea in a concentration of between 20-50% w/w and optionally a binder, wherein said granule comprises a granule strength of at least 1.1 Kg/granule.
Description
GRANULES OF POLYHALITE AND UREA AND A COMPACTION PROCESS FOR THE PRODUCTION
THEREOF
Field of the Invention
The present invention relates to the field of composite fertilizers, specifically to production of a compacted polyhahte and urea fertilizer.
Background of the Invention
To grow properly, plants need nutrients (nitrogen, potassium, calcium, zinc, magnesium, iron, manganese, etc.) which normally can be found in the soil. Sometimes fertilizers are needed to achieve a desired plant growth as these can enhance the growth of plants.
This growth of plants is met in two ways, the traditional one being additives that provide nutrients. The second mode by which some fertilizers act is to enhance the effectiveness of the soil by modifying its water retention and aeration. Fertilizers typically provide, in varying proportions, three main macronutrients:
Nitrogen (N): leaf growth;
Phosphorus (P): Development of roots, flowers, seeds, fruit;
Potassium (K): Strong stem growth, movement of water in plants, promotion of flowering and fruiting; three secondary macronutrients: calcium (Ca), magnesium (Mg), and Sulphur (S); micronutrients: copper (Cu), iron (Fe), manganese (Mn),
molybdenum (Mo), zinc (Zn), boron (B), and of occasional significance there are silicon (Si), cobalt (Co), and vanadium (V) plus rare mineral catalysts. The most reliable and effective way to make the availability of nutrients coincide with plant requirements is by controlling their release into the soil solution, using slow release or controlled release fertilizers.
Both slow release fertilizers (SRF) and controlled release fertilizers (CRF) supply nutrients gradually. Yet, slow release fertilizers and controlled release fertilizers differ in many ways: The technology they use, the release mechanism, longevity, release controlling factors and more.
Solid fertilizers include granules, prills, crystals and powders. A prilled fertilizer is a type of granular fertilizer that is nearly spherical made by solidifying free-falling droplets in air or a fluid medium. Most controlled- release fertilizers (CRFs) used in commercial nurseries are prilled fertilizers that have been coated with sulfur or a polymer. These products
have been developed to allow a slow release of nutrients into the root zone throughout crop development.
Polyhalite is an evaporite mineral, a hydrated sulfate of potassium, calcium and magnesium with formula: K2Ca2Mg(S04)4 2H2O. Polyhahte is used as a fertilizer since it contains four important nutrients and is low in chloride:
48% SO3 as sulfate
14% K20
6% MgO
17% CaO
Nitrogen is essential component for the plant. N containing fertilizers like Urea, ammonium nitrate, ammonium sulphate calcium nitrate and Magnesium nitrate are useful for the plant's growth.
Urea, also known as carbamide, is an organic compound with chemical formula CO(NH2)2. This amide has two -NH2 groups joined by a carbonyl (C=0) functional group.
Polyhalite and urea, although both useful for the proper growth of a plant are practically un-mixable due to urea is considered a ductile material, and polyhahte is a mined non-ductile substance. From a chemical point of view it is extremely difficult of cause the adherence of these two substances without using shear force as these are both solids.
Summary of the Invention
According to some demonstrative embodiments, there is provided herein a granule of polyhahte and urea.
According to some embodiments, the concentration of polyhahte in the granule may be in a range between 20-80% w/w, preferably, between 30- 70% w/w, most preferably between 40-60% w/w.
According to some embodiments, there is provided a process for the compaction of Polyhahte with a urea, the process comprising: mixing a feed of polyhahte with a feed of urea and optionally a binder in a mixer to yield a mixture; compacting in a compactor to yield masses; crushing said masses in a crusher to yield particles; and screening said particles in a screener to yield different particles in three different sizes: oversized particles which undergo a second crushing process and are retuned to said screener for screening, undersized particles which are transferred to said mixer for further mixing, and desired size granular particles which are transferred to a polish screener.
Detailed Description of the Invention
According to some demonstrative embodiments, there is provided herein a granule of polyhalite and urea.
According to some embodiments, plants need nitrogen to grow, develop and produce usable products. Since plants get their nitrogen from the soil, farmers must replenish nitrogen to ensure successful growth and to replace nitrogen removed in the harvested crop.
When plants are not provided with sufficient nitrogen, they become nitrogen deficient. Plants with nitrogen deficiency often have spindly stems and their growth is stunted.
Nitrogen use efficiency (NUE) is the fraction of applied nitrogen that is absorbed and used by the plant. Improving a plant’s abihty to utilize nitrogen is a key component in enhancing environmental sustainability. Due to the substantial yield increases resulting from fertilization, farmers have steadily increased the amount of fertilizer added per unit of land area. According to some embodiments, the unique combination of polyhalite and urea in a single compacted granule allows for the NUE to be increased, e.g., without increasing the amount of fertilizer provided to the plants. According to some embodiments, the concentration of polyhahte in the granule may be in a range between 20-80% w/w, preferably, between 30- 70% w/w, most preferably between 40-60% w/w.
According to some embodiments, there is provided a process for the compaction of Polyhalite with a urea, the process comprising: mixing a feed of polyhalite with a feed of urea and optionally a binder in a mixer to yield a mixture; compacting in a compactor to yield masses; crushing said masses in a crusher to yield particles; and screening said particles in a screener to yield different particles in three different sizes: oversized particles which undergo a second crushing process and are retuned to said screener for screening, undersized particles
which are transferred to said mixer for further mixing, and desired size granular particles which are transferred to a polish screener.
The final product contain: N,K,S,MgO,CaO
The mixture for the compactor may contain 50-70% w/w of Polyhalite, 20- 50% w/w of Urea and optionally a binder.
According to some embodiments, the mixing may be performed in a blade blender and/or any other suitable devise capable of having a rotation speed that creates a swirling motion for a perfect homogenization and a high blending precision, e.g., a Ploughshare ® Mixer.
According to some demonstrative embodiments, the compaction may be a wet compaction.
The compaction process may include the addition of a binder 1-5% binder. The binder may include but not limited : for example, organic or inorganic binders, such as, starch, bentonite, sodium silicate, lignosulfonates, molasses, hydrated hme, bitumen, Portland cement, clay, acids, cellulose gum, sucrose, water, water glass, cements, Fly Ash, Potassium and Sodium
Silicate, MgO, CaO, Alganite, Geo-polymers, oils and waxesand the like, or a combination thereof.
The dry compaction process may include the following steps:
Mixing Potash with Ammonium Sulphate according to the formula. Adding micronutrients .
Adding organic or inorganic binder between 1-5% preferably between 2- 4% 1-2%
Adding water between 0.5-2%, preferably 0.5-1%.
The mixture may be heated to a temperature between 80-180 °C, preferably 160°C.
Feeding the mixture into a compactor to provide compacted flakes; Grinding of the flakes;
Sieving of the grinded flakes; and After sieving there are three types of yield:
1. Desired sized flakes - between 14 - 33 mm thickness, S.G. between 1.9 to 2.4 g/cm3. According to some embodiments, the desired size of
the flakes (also referred to herein as “particles” or “granules”) is between 1-6 mm, most preferably between 2-4 mm.
2. Oversized (OS) flakes - are returned to the grinding stage, e.g., between 4-20% w/w of the total resulting flakes.
3. Undersized (US) flakes - are recycled to the mixture for compaction, e.g., between 10 to 80% w/w of the total resulting flakes.
According to some embodiments, in the dry process, optionally a binder may be added in a concentration of between 0.01-7% w/w, preferably between 1- 5% w/w, most preferably between 2-4% w/w.
The final product may submitted to post-treatment oil may be added to the resulting granules, e.g., to improve the rheology of the product and diminish dust formation. Polishing the granules or Coating. The resulting flakes/granules may be glazed and further coated with a suitable coating.
For example, the coatings may include biodegradable coatings, sustained release coatings, controlled release coatings, oily coatings, wax coatings. The dry compaction process may include the following steps:
1. Mixing materials -3 Kg of mixture containing Poly halite, urea and binder in 200 lit mixer
2. Adding binder
3. Adding water
4. Compacting- Diameter 600 mm, width 145 mm. working force lOOKN/cm. roll velocity 6 rpm.
5. Crushing using hammer mill-
6. Screening
7. Drying the granule between 2-4 mm Single strength 1.3 Kg/granules
8. Recycling-80%
9. Analysis. All analyses conducted according to the standard procedure
Example 1
50% polyhahte + 50% urea Abrasion in - 12 mesh 22%
Eco dust 1.9%
Strength of granule immediately after production 1.4 Kg granule Strength of granule after 1 month 2.3 Kg granule
Example2
70% polyhahte + 30% urea
Abrasion in - 12 mesh 26%
Eco dust 2.2%
Strength of granule immediately after production 1.4 Kg granule Strength of granule after 1 month 2.2 Kg granule
Example 3
70% polyhalite + 20% urea+10%ammonium sulphate Abrasion in - 12 mesh 40%
Eco dust 2.3%
Strength of granule immediately after production 1.1 Kg granule Strength of granule after 1 month 1.3 Kg granule
Example 4
70% polyhalite + 22% urea+6%ammonium sulphate+2% ligno sulphonate Abrasion in - 12 mesh 16%
Eco dust 0.9%
Strength of granule immediately after production 1.2 Kg granule Strength of granule after 1 month 1.9 Kg granule
Example 5
48% polyhahte + 50% urea+2%starch Abrasion in - 12 mesh 28%
Eco dust 1.8%
Strength of granule immediately after production 1.1 Kg granule
Strength of granule after 1 month 1.9 Kg granule
Example 6
48% polyhalite + 50% urea+2% lignosulphonate Abrasion in - 12 mesh 12%
Eco dust 0.8%
Strength of granule immediately after production 2 Kg granule Strength of granule after 1 month 3.3 Kg granule.
Claims
1. A granule comprising polyhalite in a concentration of between 20- 80% w/w and urea in a concentration of between 20-50% w/w and optionally a binder, wherein said granule comprises a granule strength of at least 1.1 Kg/granule.
2. The granule of claim 1, wherein said binder is present in an concentration of between 1-5% w/w
3. The granule of claim 2, wherein said concentration is between 1-2% w/w.
4. The granule of claim 2, wherein said binder is a lignosulphonate.
5. The granule of claim 2, wherein said binder is starch.
6. A process for the compaction of Polyhalite with a urea, the process comprising: mixing a feed of polyhalite with a feed of urea and optionally a binder in a mixer to yield a mixture; compacting in a compactor to yield masses; crushing said masses in a crusher to yield particles; and screening said particles in a screener to yield different particles in three different sizes: oversized particles which undergo a second crushing process and are retuned to said screener for screening, undersized particles which are transferred to said mixer for further mixing, and desired size granular particles which are transferred to a polish screener.
The process of claim 6, wherein said polyhalite is in a concentration of between 20-80% w/w and urea is in a concentration of between 20-
50% w/w.
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US17/785,999 US20230250037A1 (en) | 2020-01-27 | 2020-12-28 | Granules of polyhalite and urea and a compaction process for the production thereof |
IL294086A IL294086A (en) | 2020-01-27 | 2020-12-28 | Granules of polyhalite and urea and a compaction process for the production thereof |
EP20917147.9A EP4097067A4 (en) | 2020-01-27 | 2020-12-28 | Granules of polyhalite and urea and a compaction process for the production thereof |
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WO2022137010A1 (en) * | 2020-12-22 | 2022-06-30 | Sabic Global Technologies B.V. | Urea for top dressing enriched with calcium, magnesium, sulfur, and potassium |
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US20180327328A1 (en) * | 2015-11-13 | 2018-11-15 | Sirius Minerals Plc | Composite fertiliser systems |
WO2018229757A1 (en) * | 2017-06-15 | 2018-12-20 | Cleveland Potash Limited | Compacted polyhalite and potash mixture and a process for the production thereof |
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DE102018007539A1 (en) * | 2018-09-25 | 2020-03-26 | K+S Aktiengesellschaft | Granules based on urea and calcined polyhalite |
IL288660B2 (en) * | 2019-09-24 | 2024-02-01 | ICL Europe Cooperatief UA | Granules of Polyhalite and Urea |
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US20180327328A1 (en) * | 2015-11-13 | 2018-11-15 | Sirius Minerals Plc | Composite fertiliser systems |
WO2018229757A1 (en) * | 2017-06-15 | 2018-12-20 | Cleveland Potash Limited | Compacted polyhalite and potash mixture and a process for the production thereof |
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EP4097067A4 (en) | 2024-01-24 |
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