WO1997014665A1 - Fertilizer containing ammonium nitrate and calcium sulphate and a method for producing it - Google Patents
Fertilizer containing ammonium nitrate and calcium sulphate and a method for producing it Download PDFInfo
- Publication number
- WO1997014665A1 WO1997014665A1 PCT/DK1996/000436 DK9600436W WO9714665A1 WO 1997014665 A1 WO1997014665 A1 WO 1997014665A1 DK 9600436 W DK9600436 W DK 9600436W WO 9714665 A1 WO9714665 A1 WO 9714665A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fertilizer
- ammonium nitrate
- drum
- gypsum
- percent
- Prior art date
Links
- 239000003337 fertilizer Substances 0.000 title claims abstract description 51
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 title claims abstract description 35
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 title description 6
- 238000004519 manufacturing process Methods 0.000 title description 5
- 235000011132 calcium sulphate Nutrition 0.000 title description 3
- 239000001175 calcium sulphate Substances 0.000 title description 3
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 35
- 239000010440 gypsum Substances 0.000 claims abstract description 35
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 239000008187 granular material Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 9
- 238000005469 granulation Methods 0.000 claims description 7
- 230000003179 granulation Effects 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 238000004090 dissolution Methods 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- 239000007900 aqueous suspension Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 239000007858 starting material Substances 0.000 claims description 2
- 238000004880 explosion Methods 0.000 description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 7
- 239000005864 Sulphur Substances 0.000 description 7
- 238000003860 storage Methods 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 244000007853 Sarothamnus scoparius Species 0.000 description 2
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 239000010459 dolomite Substances 0.000 description 2
- 229910000514 dolomite Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003979 granulating agent Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910020091 MgCa Inorganic materials 0.000 description 1
- 101100003996 Mus musculus Atrn gene Proteins 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- -1 salt compounds Chemical class 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C1/00—Ammonium nitrate fertilisers
- C05C1/02—Granulation; Pelletisation; Stabilisation; Colouring
Definitions
- the present invention relates to a fertilizer on a granulated form and containing ammonium nitrate and optionally further fertilizer components.
- Ammonium nitrate is a commonly used nitrogen source in fertilizers, and in a pure form ammonium nitrate contains between 34.3 and 34.8 percent by weight of nitrogen.
- Ammonium nitrate for use as a fertilizer has conventionally been formulated as granules consisting of ammonium nitrate as the sole component.
- the object of the invention is to provide an explosion proof fertilizer.
- This object is achieved by the fertilizer according to the invention, which fertilizer is characterized in that it contains completely or partially dehydrated gypsum in an amount of at least 6 percent by weight, and that the level of the total content of gypsum, water and optionally further fertilizer components present is such that the content of nitrogen in the fertilizer is less than 28 percent by weight.
- Powdered ammonium nitrate is considered to be one of the primary explosion triggering factors.
- the fertilizer according to the invention has a strongly reduced release of ammonium nitrate compared with the prior art ammonium nitrate fertilizers, since the dust formed during transportation, handling and use consists primarily of gypsum.
- the reduced release of ammonium nitrate dust is assumed to account for one of the reasons that the fertilizer according to the invention is explosion proof.
- gypsum has the effect of raising the pH of the fertilizer, which is also assumed to counteract the explosion risk.
- a further reason for the eliminated explosion risk is assumed to be that the granules according to the invention are substantially more firm and stable during transportation, storage and use compared with the prior art granules, which makes it possible to maintain an even distribution of the ammonium nitrate content both in the individual granules and in a given portion of the fertilizer, and thereby to avoid that the content of nitrogen in the portion increases locally to a level above 28 percent by weight.
- Ammonium nitrate is thus highly hygroscopic per se, and the prior art fertilizers in the form of granules which exclusively consist of ammmonium nitrate will therefore strongly tend to absorp moisture from the surrounding atmosphere and thereby be dissolved completely or partially, and as a result of which a local concentration of nitrogen may be formed. As a result of their gypsum content the granules acccording to the invention will far less tend to absorp moisture from the surroundings.
- a further advantage of the fertilizer according to the invention is that it is more storage stable than the prior art fertilizers of the same type.
- the fertilizer according to the invention furthermore offers the essential advantage of containing a sulphur source in the form of gypsum.
- the gypsum in the fertilizer according to the invention serves both as a granulating agent and as a sulphur source.
- the fertilizer acccording to the invention may contain between 40 and 81 percent by weight of ammonium nitrate and between 6 and 50 percent by weight of gypsum in addition to water and optionally other further fertilizer components.
- the fertilizer typically has a content of bound water of from 0.5 to 6.0 percent by weight, more typically of from 0.5 to 4.0 percent by weight, and most typically of from 1.0 to 2.5 percent by weight. It is not known of which chemical salt compounds the granulate according to the invention exactly consists, but at least part of the water content is assumed to be used for the setting of calcium sulphate under the formation of CaS0 4 ,2H 2 0.
- the group of optional further fertilizer compounds comprises all natural and synthetic inorganic and organic compounds having fertilizing and soil ameliorating effects, including lime and the trace elements Mg, Mn, Mo, B, Co, Cu, Zn and their salts or complex compounds.
- Magnesium is preferably added in the form of crushed dolomite, (MgCa (C0 3 ) ) 2 •
- the granulate according to the invention may contain dolomite in an amount of from 0 to 30 percent by weight based on the finished hydrous granulate.
- the granules according to the invention preferably comprise a thinly applied surface layer of fine gypsum powder.
- the gypsum powder is applied to the finished granules to absorp remaining moisture, if any, and in order thereby to make the product more storage stable and free flowing.
- due to the surface layer dust released from the granulate during transportation and handling mainly consists of gypsum and only to a small extent of ammonium nitrate, and as a result thereof the explosion risk is further reduced.
- the present invention also relates to a method of producing the fertilizer according to the invention.
- the method according to the invention is characterized in providing in a granulator an aqueous suspension of ammonium nitrate, adding to the granulator completely or partially dehydrated gypsum and optionally further fertilizer components, and granulating the resulting mixture.
- the granulator used may be any granulator which is suitable for the granulation of suspensions, such as a drum granulator, a pan granulator, a spray granulator, a fluid-bed granulator, and a spray-bed granulator, preferably a drum granulator.
- the suspension of ammonium nitrate is preferably obtained by adding a measured amount of water to ammonium nitrate particles for the partial dissolution thereof.
- This method presents the advantage that the granules formed by said granulation are more uniform in form and size compared with the use of other methods of obtaining a suspension of ammonium nitrate. It is assumed that the addition of water to the ammonium nitrate particles causes a partial dissolution of the individual particles, and that these partially dissolved particles serve as nuclei in the subsequent granulation.
- Completely or partially dehydrated gypsum as used herein means CaS0 4 , ⁇ H 2 0 and CaSCj of natural or synthetic origin, including waste products, such as smoke gas gypsum from desulphurization plants and so-called phosphor gypsum from phosphor acid production.
- the completely or partially dehydrated gypsum used is preferably powdered and capable of absorbing and binding water for the setting of the gypsum under the formation of i.a. CaS0 4 ,2H 2 0.
- a preferred embodiment of the method according to the invention is characterized in (a) that a rotary drum is used as granulator, (b) that particulate ammonium nitrate starting material is introduced at one end of the drum, (c) that water is added in a first section of the drum so as to form a partially dissolved mass, (d) that completely or partially dehydrated gypsum and optionally further fertilizer components are added in a second section of the drum, (e) that additional water is added in a third section of the drum during granulation of the mass obtained, and (f) that the finished granules are discharged at the other end of the drum.
- a fertilizer according to the invention having a nitrogen content of 26.9 percent by weight and a sulphur content of 4.2 percent by weight was prepared.
- the ammonium nitrate used is a commercial product supplied by Rosenkrantz A/S, and which has a total nitrogen content of 34.5 percent by weight, a nitrate nitrogen content of 17.3 percent by weight and an ammonium nitrogen content of 17.2 percent by weight.
- the gypsum used is a stucco supplied by Br ⁇ ste A/S and which has the following composition:
- CaO about 38.60 percent by weight
- Si0 2 about 0.54 percent by weight
- A1 2 P 3 about 0.07 percent by weight
- the gypsum has such hygroscopicity that 1.4 kg of gypsum can absorp about 1 kg of water.
- the granulation was effected in a cylindrical rotary drum granulator having a length of 6 m and a diameter of 2.0 , each end of which having a circular opening having a diameter of 90 cm.
- the drum is placed in an inclined position, the inlet end being raised by 25 cm.
- the drum is provided with a broom for keeping the inside surface of the drum free from coatings of precipitated solid matter.
- the broom and the rotation of the drum are driven by an oil engine having a driving force of 45 HP.
- the drum is driven at a rotating velocity of 20 r.p.m.
- ammonium nitrate particles are continuously introduced in an amount of 35.1 tons per hour through the opening at the elevated end of the drum by use of a first conveyor belt.
- water is added via nozzles in an amount of 0.81 ton per hour for the partial dissolution of the individual ammonium nitrate particles.
- gypsum is continuously added in an amount of 9.0 tons per hour through said opening by use of a second conveyor belt.
- the granulation of the resulting aqueous suspension/solution of fertilizer components is then completed in the remaining part of the longitudinal direction of the drum under successive addition of additional water via nozzles in an amount of 0.09 ton per hour.
- a thin layer of powdered gypsum is applied to the surface of the finished granules.
- the application is effected by the depositing of gypsum powder which is present in the inside of the drum onto the surface of the granules.
- the average retention time of ammonium nitrate in the drum is 6-7 minutes.
- the granulate prepared has the following data of contents :
- nitrate nitrogen 13.5 percent by weight ammonium nitrogen: 13.4 percent by weight total sulphur: 4.2 percent by weight water soluble sulphur: 3.8 percent by weight
- the finished granulate does not form lumps and is free- flowing.
- the granulate was stored for one month in a conical heap having a height of 3 m. No agglomeration of the granulate occurred during storage, and the granulate continued free of lumps and free-flowing after the storage.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Fertilizers (AREA)
Abstract
Fertilizer on a granulated form and containing ammonium nitrate and optionally further fertilizer components, which fertilizer contains completely or partially dehydrated gypsum in an amount of at least 6 percent by weight, and in which the level of the total content of gypsum, water and optionally further fertilizer components present is such that the content of nitrogen in the fertilizer is less than 28 percent by weight.
Description
FERTILIZER CONTAINING AMMONIUM NITRATE AND CALCIUM SULPHATE AND A METHOD FOR PRODUCING IT
The present invention relates to a fertilizer on a granulated form and containing ammonium nitrate and optionally further fertilizer components.
Ammonium nitrate is a commonly used nitrogen source in fertilizers, and in a pure form ammonium nitrate contains between 34.3 and 34.8 percent by weight of nitrogen.
Ammonium nitrate for use as a fertilizer has conventionally been formulated as granules consisting of ammonium nitrate as the sole component.
However, such a fertilizer has the drawback that it entails an explosion risk in certain circumstances, and it is therefore necessary to take certain precautionary measures in connection with the manufacture, transportation and storage of said fertilizer. In most countries the use of fertilizers consisting of ammonium nitrate is prohibited.
The object of the invention is to provide an explosion proof fertilizer. This object is achieved by the fertilizer according to the invention, which fertilizer is characterized in that it contains completely or partially dehydrated gypsum in an amount of at least 6 percent by weight, and that the level of the total content of gypsum, water and optionally further fertilizer components present is such that the content of nitrogen in the fertilizer is less than 28 percent by weight.
It has surprisingly been found that the explosion risk of an ammonium nitrate fertilizer can be completely eliminated partly by reducing the content of nitrogen to
less than 28 percent by weight and partly by using gypsum as a granulating agent.
Powdered ammonium nitrate is considered to be one of the primary explosion triggering factors. The fertilizer according to the invention has a strongly reduced release of ammonium nitrate compared with the prior art ammonium nitrate fertilizers, since the dust formed during transportation, handling and use consists primarily of gypsum. The reduced release of ammonium nitrate dust is assumed to account for one of the reasons that the fertilizer according to the invention is explosion proof.
Furthermore, gypsum has the effect of raising the pH of the fertilizer, which is also assumed to counteract the explosion risk.
A further reason for the eliminated explosion risk is assumed to be that the granules according to the invention are substantially more firm and stable during transportation, storage and use compared with the prior art granules, which makes it possible to maintain an even distribution of the ammonium nitrate content both in the individual granules and in a given portion of the fertilizer, and thereby to avoid that the content of nitrogen in the portion increases locally to a level above 28 percent by weight.
Ammonium nitrate is thus highly hygroscopic per se, and the prior art fertilizers in the form of granules which exclusively consist of ammmonium nitrate will therefore strongly tend to absorp moisture from the surrounding atmosphere and thereby be dissolved completely or partially, and as a result of which a local concentration of nitrogen may be formed.
As a result of their gypsum content the granules acccording to the invention will far less tend to absorp moisture from the surroundings.
Thus, a further advantage of the fertilizer according to the invention is that it is more storage stable than the prior art fertilizers of the same type.
In recent years there has been an increasing need to add sulphur as a fertilizer to plants and crops, as the amount of sulphur in the atmosphere and rainfall is reduced as a result of the reduced emission of sulphur- containing compounds from power plants and other industries.
Thus, the fertilizer according to the invention furthermore offers the essential advantage of containing a sulphur source in the form of gypsum.
Thus, the gypsum in the fertilizer according to the invention serves both as a granulating agent and as a sulphur source.
Based on the finished hydrous granulate and dependent on the desired application, the fertilizer acccording to the invention may contain between 40 and 81 percent by weight of ammonium nitrate and between 6 and 50 percent by weight of gypsum in addition to water and optionally other further fertilizer components.
Dependent on the gypsum content the fertilizer typically has a content of bound water of from 0.5 to 6.0 percent by weight, more typically of from 0.5 to 4.0 percent by weight, and most typically of from 1.0 to 2.5 percent by weight.
It is not known of which chemical salt compounds the granulate according to the invention exactly consists, but at least part of the water content is assumed to be used for the setting of calcium sulphate under the formation of CaS04,2H20.
The group of optional further fertilizer compounds comprises all natural and synthetic inorganic and organic compounds having fertilizing and soil ameliorating effects, including lime and the trace elements Mg, Mn, Mo, B, Co, Cu, Zn and their salts or complex compounds.
Magnesium is preferably added in the form of crushed dolomite, (MgCa (C03) ) 2• The granulate according to the invention may contain dolomite in an amount of from 0 to 30 percent by weight based on the finished hydrous granulate.
The granules according to the invention preferably comprise a thinly applied surface layer of fine gypsum powder. The gypsum powder is applied to the finished granules to absorp remaining moisture, if any, and in order thereby to make the product more storage stable and free flowing. Furthermore, due to the surface layer dust released from the granulate during transportation and handling mainly consists of gypsum and only to a small extent of ammonium nitrate, and as a result thereof the explosion risk is further reduced.
The present invention also relates to a method of producing the fertilizer according to the invention. The method according to the invention is characterized in providing in a granulator an aqueous suspension of ammonium nitrate, adding to the granulator completely or partially dehydrated gypsum and optionally further
fertilizer components, and granulating the resulting mixture.
The granulator used may be any granulator which is suitable for the granulation of suspensions, such as a drum granulator, a pan granulator, a spray granulator, a fluid-bed granulator, and a spray-bed granulator, preferably a drum granulator.
The suspension of ammonium nitrate is preferably obtained by adding a measured amount of water to ammonium nitrate particles for the partial dissolution thereof. This method presents the advantage that the granules formed by said granulation are more uniform in form and size compared with the use of other methods of obtaining a suspension of ammonium nitrate. It is assumed that the addition of water to the ammonium nitrate particles causes a partial dissolution of the individual particles, and that these partially dissolved particles serve as nuclei in the subsequent granulation.
Completely or partially dehydrated gypsum as used herein means CaS04,^H20 and CaSCj of natural or synthetic origin, including waste products, such as smoke gas gypsum from desulphurization plants and so-called phosphor gypsum from phosphor acid production.
The completely or partially dehydrated gypsum used is preferably powdered and capable of absorbing and binding water for the setting of the gypsum under the formation of i.a. CaS04,2H20.
A preferred embodiment of the method according to the invention is characterized in (a) that a rotary drum is used as granulator, (b) that particulate ammonium nitrate starting material is introduced at one end of the drum,
(c) that water is added in a first section of the drum so as to form a partially dissolved mass, (d) that completely or partially dehydrated gypsum and optionally further fertilizer components are added in a second section of the drum, (e) that additional water is added in a third section of the drum during granulation of the mass obtained, and (f) that the finished granules are discharged at the other end of the drum.
The invention will now be described in further detail by reference to the following example.
Example
A fertilizer according to the invention having a nitrogen content of 26.9 percent by weight and a sulphur content of 4.2 percent by weight was prepared.
For the production of the fertilizer 35.1 tons of ammonium nitrate, 9.0 tons of gypsum and 0.9 ton of water were used.
The ammonium nitrate used is a commercial product supplied by Rosenkrantz A/S, and which has a total nitrogen content of 34.5 percent by weight, a nitrate nitrogen content of 17.3 percent by weight and an ammonium nitrogen content of 17.2 percent by weight.
The gypsum used is a stucco supplied by Brøste A/S and which has the following composition:
CaO: about 38.60 percent by weight
S03: about 54.40 percent by weight
Si02: about 0.54 percent by weight A12P3: about 0.07 percent by weight
Fe203: about 0.05 percent by weight
MgO: 0.13 percent by weight
Crystallization water: the remainder
The gypsum has such hygroscopicity that 1.4 kg of gypsum can absorp about 1 kg of water.
The granulation was effected in a cylindrical rotary drum granulator having a length of 6 m and a diameter of 2.0 , each end of which having a circular opening having a diameter of 90 cm. The drum is placed in an inclined position, the inlet end being raised by 25 cm.
The drum is provided with a broom for keeping the inside surface of the drum free from coatings of precipitated solid matter.
The broom and the rotation of the drum are driven by an oil engine having a driving force of 45 HP.
The drum is driven at a rotating velocity of 20 r.p.m.
In the preparation of the granulate according to the invention ammonium nitrate particles are continuously introduced in an amount of 35.1 tons per hour through the opening at the elevated end of the drum by use of a first conveyor belt.
In the first section of the drum, water is added via nozzles in an amount of 0.81 ton per hour for the partial dissolution of the individual ammonium nitrate particles.
At a distance of about 1.5 from the inlet opening of the drum, gypsum is continuously added in an amount of 9.0 tons per hour through said opening by use of a second conveyor belt.
The granulation of the resulting aqueous suspension/solution of fertilizer components is then completed in the remaining part of the longitudinal direction of the drum under successive addition of additional water via nozzles in an amount of 0.09 ton per hour.
At the outlet end of the drum a thin layer of powdered gypsum is applied to the surface of the finished granules. The application is effected by the depositing of gypsum powder which is present in the inside of the drum onto the surface of the granules.
The average retention time of ammonium nitrate in the drum is 6-7 minutes.
The granulate prepared has the following data of contents :
total nitrogen: 26.9 percent by weight nitrate nitrogen: 13.5 percent by weight ammonium nitrogen: 13.4 percent by weight total sulphur: 4.2 percent by weight water soluble sulphur: 3.8 percent by weight
The finished granulate does not form lumps and is free- flowing. The granulate was stored for one month in a conical heap having a height of 3 m. No agglomeration of the granulate occurred during storage, and the granulate continued free of lumps and free-flowing after the storage.
Claims
1. A fertilizer on a granulated form and containing ammonium nitrate and optionally further fertilizer components, c h a r a c t e r i z e d in that it contains completely or partially dehydrated gypsum in an amount of at least 6 percent by weight, and that the level of the total content of gypsum, water, and optionally further fertilizer components present is such that the content of nitrogen in the fertilizer is less than 28 percent by weight.
2. A fertilizer according to claim 1, c h a r a c t e r i z e d in containing between 40 and 81 percent by weight of ammonium nitrate.
3. A fertilizer according to claim 1 or 2, c h a r a c¬ t e r i z e d in containing between 6 and 50 percent by weight of gypsum.
4. A fertilizer according to claims 1, 2 or 3, c h a ¬ r a c t e r i z e d in that the granules comprise a thinly applied surface layer of fine gypsum powder.
5. A method of producing the fertilizer according to claim 1, c h a r a c t e r i z e d in providing in a granulator an aqueous suspension of ammonium nitrate, adding to the granulator completely or partially dehydrated gypsum and optionally further fertilizer components, and granulating the resulting mixture.
6. A method according to claim 5, c h a r a c t e r i ¬ z e d in using a drum granulator as granulator.
7. A method according to claim 5 or 6, c h a r a c t e r i z e d in that the suspension of ammonium nitrate is obtained by adding a measured amount of water to ammonium nitrate particles for the partial dissolution thereof.
8. A method according to claim 5, c h a r a c t e r i - z e d in (a) that a rotary drum is used as granulator, b) that the particulate ammonium nitrate starting material is introduced at one end of the drum, (c) that water is added in a first section of the drum to form a partially dissolved mass, (d) that completely or partially dehydrated gypsum and optionally further fertilizer components are added in a second section of the drum, (e) that additional water is added in a third section of the drum during granulation of the mass obtained, and (f) that the finished granules are discharged at the other end of the drum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU72791/96A AU7279196A (en) | 1995-10-17 | 1996-10-11 | Fertilizer containing ammonium nitrate and calcium sulphate and a method for producing it |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK1174/95 | 1995-10-17 | ||
| DK117495 | 1995-10-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1997014665A1 true WO1997014665A1 (en) | 1997-04-24 |
Family
ID=8101830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DK1996/000436 WO1997014665A1 (en) | 1995-10-17 | 1996-10-11 | Fertilizer containing ammonium nitrate and calcium sulphate and a method for producing it |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU7279196A (en) |
| WO (1) | WO1997014665A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004000759A1 (en) * | 2002-06-20 | 2003-12-31 | Kemira Growhow Oyj | Coated fertiliser particles |
| WO2006090007A3 (en) * | 2005-02-25 | 2007-05-24 | Kemira Growhow Oyj | Ammonium nitrate granule and method for the preperation of the same |
| WO2007084873A3 (en) * | 2006-01-13 | 2007-10-25 | Honeywell Int Inc | Stabilized compositions comprising ammonium nitrate |
| EP2325154A2 (en) * | 2006-01-13 | 2011-05-25 | Honeywell International Inc. | Compositions comprising ammonium nitrate double salts |
| JP2011528314A (en) * | 2008-07-15 | 2011-11-17 | ハネウェル・インターナショナル・インコーポレーテッド | Weakly oxidizing ammonium nitrate composite material and method for preparing the composition |
| WO2012007331A1 (en) * | 2010-07-16 | 2012-01-19 | Sandvik Materials Technology Deutschland Gmbh | Method for producing tablets containing ammonium nitrate |
| WO2014033159A3 (en) * | 2012-08-29 | 2014-05-01 | Yara International Asa | Safe blends of ammonium nitrate (an) with urea, or of an an-comprising product with a urea-comprising product |
| WO2014033161A3 (en) * | 2012-08-29 | 2014-08-07 | Yara International Asa | Method for limiting the use of an ammonium nitrate fertilizer as a precursor for an explosive and composition therefor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB991575A (en) * | 1961-08-03 | 1965-05-12 | Armour & Co | Preparation of granular nitrogenous fertilizer |
| DE2115630A1 (en) * | 1971-03-29 | 1972-10-12 | Chemie Linz Ag | Granulated, sprayed or prilled fertilizers containing at least predominantly ammonium salts with improved shelf life and a process for their production |
| US4026695A (en) * | 1975-02-24 | 1977-05-31 | Union Oil Company Of California | Particulate multicomponent soil additive |
| EP0013108A1 (en) * | 1978-12-22 | 1980-07-09 | Adelaide & Wallaroo Fertilizers Ltd. | Improvements in and relating to granulation |
-
1996
- 1996-10-11 AU AU72791/96A patent/AU7279196A/en not_active Abandoned
- 1996-10-11 WO PCT/DK1996/000436 patent/WO1997014665A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB991575A (en) * | 1961-08-03 | 1965-05-12 | Armour & Co | Preparation of granular nitrogenous fertilizer |
| DE2115630A1 (en) * | 1971-03-29 | 1972-10-12 | Chemie Linz Ag | Granulated, sprayed or prilled fertilizers containing at least predominantly ammonium salts with improved shelf life and a process for their production |
| GB1382870A (en) * | 1971-03-29 | 1975-02-05 | Chemie Linz Ag | Fertilisers |
| US4026695A (en) * | 1975-02-24 | 1977-05-31 | Union Oil Company Of California | Particulate multicomponent soil additive |
| EP0013108A1 (en) * | 1978-12-22 | 1980-07-09 | Adelaide & Wallaroo Fertilizers Ltd. | Improvements in and relating to granulation |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004000759A1 (en) * | 2002-06-20 | 2003-12-31 | Kemira Growhow Oyj | Coated fertiliser particles |
| US8110018B2 (en) | 2005-02-25 | 2012-02-07 | Kemira Growhow Oyj | Ammonium nitrate granule and method for the preparation of the same |
| WO2006090007A3 (en) * | 2005-02-25 | 2007-05-24 | Kemira Growhow Oyj | Ammonium nitrate granule and method for the preperation of the same |
| NO344492B1 (en) * | 2005-02-25 | 2020-01-13 | Yara Int Asa | Ammonium nitrate granules and process for their preparation |
| RU2403234C2 (en) * | 2005-02-25 | 2010-11-10 | Яра Суоми Ой | Ammonium nitrate granule and preparation method thereof |
| US8814977B2 (en) | 2006-01-13 | 2014-08-26 | Honeywell International Inc. | Stabilized compositions comprising ammonium nitrate |
| RU2435748C2 (en) * | 2006-01-13 | 2011-12-10 | Хонейвелл Интернэшнл Инк. | Stabilised compositions containing ammonium nitrate |
| US8075660B2 (en) | 2006-01-13 | 2011-12-13 | Honeywell International Inc. | Stabilized compositions comprising ammonium nitrate |
| EP2325154A2 (en) * | 2006-01-13 | 2011-05-25 | Honeywell International Inc. | Compositions comprising ammonium nitrate double salts |
| EP2325155A3 (en) * | 2006-01-13 | 2012-10-03 | Honeywell International Inc. | Stabilized compositions comprising ammonium nitrate |
| WO2007084873A3 (en) * | 2006-01-13 | 2007-10-25 | Honeywell Int Inc | Stabilized compositions comprising ammonium nitrate |
| AU2007205959B2 (en) * | 2006-01-13 | 2011-08-25 | Advansix Resins & Chemicals Llc | Stabilized compositions comprising ammonium nitrate |
| JP2009528239A (en) * | 2006-01-13 | 2009-08-06 | ハネウェル・インターナショナル・インコーポレーテッド | Stabilized composition comprising ammonium nitrate |
| JP2015078116A (en) * | 2006-01-13 | 2015-04-23 | ハネウェル・インターナショナル・インコーポレーテッド | Stabilized composition comprising ammonium nitrate |
| JP2011528314A (en) * | 2008-07-15 | 2011-11-17 | ハネウェル・インターナショナル・インコーポレーテッド | Weakly oxidizing ammonium nitrate composite material and method for preparing the composition |
| US9366485B2 (en) | 2010-07-16 | 2016-06-14 | Sandvik Materials Technology Deutschland Gmbh | Method for producing tablets containing ammonium nitrate |
| WO2012007331A1 (en) * | 2010-07-16 | 2012-01-19 | Sandvik Materials Technology Deutschland Gmbh | Method for producing tablets containing ammonium nitrate |
| EA024242B1 (en) * | 2010-07-16 | 2016-08-31 | Сэндвик Материалз Текнолоджи Дойчланд Гмбх | Method for producing tablets containing ammonium nitrate |
| WO2014033161A3 (en) * | 2012-08-29 | 2014-08-07 | Yara International Asa | Method for limiting the use of an ammonium nitrate fertilizer as a precursor for an explosive and composition therefor |
| US9328031B2 (en) | 2012-08-29 | 2016-05-03 | Yara International Asa | Method for limiting the use of an ammonium nitrate fertilizer as a precursor for an explosive and composition therefor |
| US9284232B2 (en) | 2012-08-29 | 2016-03-15 | Yara International Asa | Safe blends of ammonium nitrate (AN) with urea, or of an AN-comprising product with a urea-comprising product |
| WO2014033159A3 (en) * | 2012-08-29 | 2014-05-01 | Yara International Asa | Safe blends of ammonium nitrate (an) with urea, or of an an-comprising product with a urea-comprising product |
Also Published As
| Publication number | Publication date |
|---|---|
| AU7279196A (en) | 1997-05-07 |
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