WO1997014665A1 - Engrais contenant du nitrate d'ammonium et du sulfate de calcium, et procede de production - Google Patents

Engrais contenant du nitrate d'ammonium et du sulfate de calcium, et procede de production Download PDF

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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
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WO
WIPO (PCT)
Prior art keywords
fertilizer
ammonium nitrate
drum
gypsum
percent
Prior art date
Application number
PCT/DK1996/000436
Other languages
English (en)
Inventor
Niels Kristan THORØ-NIELSEN
Original Assignee
Thoroe Nielsen Niels Kristan
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thoroe Nielsen Niels Kristan filed Critical Thoroe Nielsen Niels Kristan
Priority to AU72791/96A priority Critical patent/AU7279196A/en
Publication of WO1997014665A1 publication Critical patent/WO1997014665A1/fr

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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.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Fertilizers (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)

Abstract

La présente invention concerne un engrais sous forme de granulés, qui contient du nitrate d'ammonium et, éventuellement, d'autres constituants d'engrais. Il contient au moins 6 % en poids de gypse complètement ou partiellement déshydraté, et sa teneur totale en gypse, en eau et, éventuellement, en d'autres constituants d'engrais, est telle que la teneur de cet engrais en azote est inférieure à 28 % en poids.
PCT/DK1996/000436 1995-10-17 1996-10-11 Engrais contenant du nitrate d'ammonium et du sulfate de calcium, et procede de production WO1997014665A1 (fr)

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
DK117495 1995-10-17
DK1174/95 1995-10-17

Publications (1)

Publication Number Publication Date
WO1997014665A1 true WO1997014665A1 (fr) 1997-04-24

Family

ID=8101830

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1996/000436 WO1997014665A1 (fr) 1995-10-17 1996-10-11 Engrais contenant du nitrate d'ammonium et du sulfate de calcium, et procede de production

Country Status (2)

Country Link
AU (1) AU7279196A (fr)
WO (1) WO1997014665A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004000759A1 (fr) * 2002-06-20 2003-12-31 Kemira Growhow Oyj Particules d'engrais enrobees
WO2006090007A3 (fr) * 2005-02-25 2007-05-24 Kemira Growhow Oyj Granule de nitrate d'ammonium et procede d'elaboration
WO2007084873A3 (fr) * 2006-01-13 2007-10-25 Honeywell Int Inc Compositions stabilisées contenant du nitrate d'ammonium
JP2011528314A (ja) * 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 弱酸化性硝酸アンモニウム複合材料および当該組成物の調製方法
WO2012007331A1 (fr) * 2010-07-16 2012-01-19 Sandvik Materials Technology Deutschland Gmbh Procédé de production de pastilles contenant du nitrate d'ammonium
WO2014033161A2 (fr) * 2012-08-29 2014-03-06 Yara International Asa Procédé permettant de limiter l'utilisation d'un engrais à base de nitrate d'ammonium comme précurseur pour un explosif et composition s'y rapportant
WO2014033159A3 (fr) * 2012-08-29 2014-05-01 Yara International Asa Mélanges sans danger de nitrate d'ammonium (na) avec de l'urée ou d'un produit comprenant du na avec un produit comprenant de l'urée

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB991575A (en) * 1961-08-03 1965-05-12 Armour & Co Preparation of granular nitrogenous fertilizer
DE2115630A1 (de) * 1971-03-29 1972-10-12 Chemie Linz Ag Mindestens überwiegend Ammonmtrat enthaltende, granulierte, gespritzte oder geprillte Düngemittel mit verbes serter Lagerfähigkeit und ein Verfahren zu ihrer Herstellung
US4026695A (en) * 1975-02-24 1977-05-31 Union Oil Company Of California Particulate multicomponent soil additive
EP0013108A1 (fr) * 1978-12-22 1980-07-09 Adelaide & Wallaroo Fertilizers Ltd. Améliorations concernant la granulation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB991575A (en) * 1961-08-03 1965-05-12 Armour & Co Preparation of granular nitrogenous fertilizer
DE2115630A1 (de) * 1971-03-29 1972-10-12 Chemie Linz Ag Mindestens überwiegend Ammonmtrat enthaltende, granulierte, gespritzte oder geprillte Düngemittel mit verbes serter Lagerfähigkeit und ein Verfahren zu ihrer Herstellung
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 (fr) * 1978-12-22 1980-07-09 Adelaide & Wallaroo Fertilizers Ltd. Améliorations concernant la granulation

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004000759A1 (fr) * 2002-06-20 2003-12-31 Kemira Growhow Oyj Particules d'engrais enrobees
US8110018B2 (en) 2005-02-25 2012-02-07 Kemira Growhow Oyj Ammonium nitrate granule and method for the preparation of the same
WO2006090007A3 (fr) * 2005-02-25 2007-05-24 Kemira Growhow Oyj Granule de nitrate d'ammonium et procede d'elaboration
NO344492B1 (no) * 2005-02-25 2020-01-13 Yara Int Asa Ammoniumnitrat granuler og fremgangsmåte for fremstilling derav
US8075660B2 (en) 2006-01-13 2011-12-13 Honeywell International Inc. Stabilized compositions comprising ammonium nitrate
AU2007205959B2 (en) * 2006-01-13 2011-08-25 Advansix Resins & Chemicals Llc Stabilized compositions comprising ammonium nitrate
EP2325155A3 (fr) * 2006-01-13 2012-10-03 Honeywell International Inc. Compositions contenant des sels doubles de nitrate d'ammonium
JP2009528239A (ja) * 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 硝酸アンモニウムを含む安定化された組成物
WO2007084873A3 (fr) * 2006-01-13 2007-10-25 Honeywell Int Inc Compositions stabilisées contenant du nitrate d'ammonium
US8814977B2 (en) 2006-01-13 2014-08-26 Honeywell International Inc. Stabilized compositions comprising ammonium nitrate
JP2015078116A (ja) * 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 硝酸アンモニウムを含む安定化された組成物
JP2011528314A (ja) * 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 弱酸化性硝酸アンモニウム複合材料および当該組成物の調製方法
US9366485B2 (en) 2010-07-16 2016-06-14 Sandvik Materials Technology Deutschland Gmbh Method for producing tablets containing ammonium nitrate
WO2012007331A1 (fr) * 2010-07-16 2012-01-19 Sandvik Materials Technology Deutschland Gmbh Procédé de production de pastilles contenant du nitrate d'ammonium
EA024242B1 (ru) * 2010-07-16 2016-08-31 Сэндвик Материалз Текнолоджи Дойчланд Гмбх Способ производства таблеток, содержащих нитрат аммония
WO2014033161A2 (fr) * 2012-08-29 2014-03-06 Yara International Asa Procédé permettant de limiter l'utilisation d'un engrais à base de nitrate d'ammonium comme précurseur pour un explosif et composition s'y rapportant
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
WO2014033161A3 (fr) * 2012-08-29 2014-08-07 Yara International Asa Procédé permettant de limiter l'utilisation d'un engrais à base de nitrate d'ammonium comme précurseur pour un explosif et composition s'y rapportant
WO2014033159A3 (fr) * 2012-08-29 2014-05-01 Yara International Asa Mélanges sans danger de nitrate d'ammonium (na) avec de l'urée ou d'un produit comprenant du na avec un produit comprenant de l'urée

Also Published As

Publication number Publication date
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