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WO2011080764A1 - Procédé d'enrobage de granulés de npk par du sulfate de zinc monohydraté - Google Patents

Procédé d'enrobage de granulés de npk par du sulfate de zinc monohydraté Download PDF

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Publication number
WO2011080764A1
WO2011080764A1 PCT/IN2010/000867 IN2010000867W WO2011080764A1 WO 2011080764 A1 WO2011080764 A1 WO 2011080764A1 IN 2010000867 W IN2010000867 W IN 2010000867W WO 2011080764 A1 WO2011080764 A1 WO 2011080764A1
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WO
WIPO (PCT)
Prior art keywords
zinc
binding
cum
zinc sulphate
anticaking agent
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/IN2010/000867
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English (en)
Inventor
Nagendra Rao Teki Nagendra Rao
Srivastava Tej Parkash Srivastava
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nagarjuna Fertilizers and Chemicals Ltd
Original Assignee
Nagarjuna Fertilizers and Chemicals Ltd
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 Nagarjuna Fertilizers and Chemicals Ltd filed Critical Nagarjuna Fertilizers and Chemicals Ltd
Publication of WO2011080764A1 publication Critical patent/WO2011080764A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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

  • This invention relates to a method of coating of zinc sulphate monohydrate on to processed NPK fertilizer granules for effective binding thereby minimizing segregation / separation of particles from the coated granules and at the same time maintaining availability of zinc in presence of phosphorus even under moist conditions.
  • Zinc (Zn) is one of the essential micro-nutrients required for healthy crop growth. Zn is usually taken up by crops from the soils. Zinc deficiency in soils was reported across globe causing reduced crop growth, yields and quality of produce. Substantial crop improvement due to zinc fertilization was documented (Takkar and Walker, 1993; Alloway, 2003). This has also profound influence on human nutrition because the source of food for majority of the global population is agricultural produce. External supply of this nutrient is inevitable when soils are not able to supply enough available zinc to meet crops' requirement.
  • Zinc sulphate and zinc oxide are most commonly known carriers of zinc though several zinc sources are known and commercially available. Zinc oxide because of its limited water solubility is less effective as zinc fertilizer particularly for short duration crops. Zinc sulphate on the other hand is a proven good source of Zn and widely recommended for soil application, because of low cost per unit of zinc and better crops' response to this Zn source.
  • DAP Di-ammonium phosphate
  • Ammonium phosphate has been restricted because, zinc sulphate heptahydrate (ZnS0 4 73 ⁇ 40) in particular is hygroscopic in nature compared to zinc oxide hence zinc ions could easily react with phosphate ions through chemical reaction forming a relatively insoluble compounds. This is particularly possible when ammonium phosphate is coming in direct contact with zinc sulphate and vice-versa in the granulation process in presence of moisture.
  • oil, wax or other binders to stick the fine micronutrients materials onto the granule surface.
  • the aliphatic and hydrophobic nature of these compounds prevents them forming a tenacious coat on the surface of the granule.
  • the main object of the present invention is to devise and standardize a method to effectively coat and physically bind preferential source of Zn fertilizer viz., zinc sulphate monohydrate with the help of an effective binding cum anticaking agent on to NPK granules manufactured through wet granulation process to achieve good retention of particles on the surface of granules at different levels of Zn concentrations, without sacrificing zinc and phosphorus availability even in presence of moisture for best usage in agriculture.
  • Zinc Sulphate in the present inventive process has more advantages to farming community by supplying NPK and Zn nutrients together in this form which considerably brings down the cost of fertilizer manufacture and handling as compared to solo applications. Above proven application has already been tested successfully in the field for customized fertilizers.
  • Figures la & lb Percent detachment of (a) zinc sulphate monohydrate and (b) zinc sulphate heptahydrate from the coated NPK granules at four levels of zinc loading and zinc sulphate : binding cum anticaking agent ratios.
  • Figures 2a-2f Moisture absorption by zinc coated NPK granules at air sealed and ambient (open) air conditions at four levels of zinc loading and three zinc sulphate monohydrate /zinc sulphate heptahydrate: binding cum anticaking agent ratios.
  • Figure 3 Relative water soluble P 2 0 5 and Zn contents in the zinc coated NPK granules kept under ambient (open) air conditions at two different zinc sulphate, anticaking agent ratios.
  • Zinc Sulphate Monohydrate coating on the NPK granules Generic NPK fertilizer grades manufactured through known routes of granulation methods can be used as a carrier/base in this zinc coating process. Required quantities of micro sized zinc sulphate should be added to these granules before bagging. Zinc sulphate mono hydrate (ZnS0 4 H 2 0) having 33-35% Zn is preferred source of zinc due to its low hygroscopic nature, having high nutrient content compared to zinc sulphate heptahydrate. In order to facilitate proper coating of the zinc sulphate monohydrate on each NPK granule, less than 100 mesh size is ideal size of particles. A thixotropic fluid is used which is an ideal mixture of the following specific compounds formulated to acquire both the binding and anticaking properties.
  • This binding cum anticaking agent is having viscosity of 15-25 centi-poise (at 20 °C). Specifc gravity is 0.91. It is devoid of any aromatic smell.
  • the above compounds are eco friendly in nature and no known acute toxic affects were reported. Because of low surface tension, the agent is easily dispersible in presence of water, which is a desirable character while applying the coated granules as a fertilizer to the agricultural fields.
  • This high viscosity compound having synergic blend of organic compounds with mineral oils is first heated to convert it into free flowing solution and the same is chosen as binding agent for zinc sulphate monohydrate.
  • This binder also prevents direct contact of zinc sulphate powder with DAP/AP material in the granules having phosphate and also to avoid reaction of forming zinc phosphate in presence of moisture.
  • This specific binding cum anticaking agent has dual property of (1) spreading fast and uniform at 50-55 °C (2) binding nature at lower temperature allows zinc sulphate monohydrate to adhere properly on the surface with minimum segregation/detachment from granule surface.
  • the anticaking viscosity is first reduced by heating at 50-55 °C and the same is applied on the granules in a rotary drum with the help of pump and nozzle.
  • the NPK granules are coated uniformly with binding cum anticaking agent film.
  • the granules are allowed for a minimum 3-5 minutes contact with binding cum anticaking agent in a rotating coating drum. At this temperature, it doesn't require air or any medium to spray and the binding cum anticaking agent gets coated uniformly on it's own.
  • the precondition for easy and uniform spread on the granule is that, the granule temperature also should be in between 40-45 °C.
  • the total composition matrix of NPK granules + zinc sulphate monohydrate/zinc sulphate heptahydrate + anticaking agent (expressed in percentage) is shown in table 1.
  • Zinc content in the granule was estimated through a method using ICP and water soluble phosphorus was estimated by standard AO AC methods of analysis.
  • Table 1 Composition matrix of NPK granule, ZnS0 4 H 2 0/ ZnS0 4 7H 2 0, binding cum anticaking agent at four levels of zinc contents.
  • Example 2 As the moisture content was below one percent in the granules at air sealed conditions even upto eight days at all levels of zinc loading signifies storage life of the coated granules under air tight conditions. The observed shelf life was quite high under sealed conditions. The granules at all levels absorb moisture effective from day two under open conditions at 70% relative humidity. This study shows that zinc sulphate hepta hydrate coated granules absorbed more moisture than zinc sulphate monohydrate coated granules at longer days of exposure beyond 6 days particularly at ' low levels of zinc loading. Where as, the moisture absorption was almost uniform at all levels of zinc sulphate monohydrate loading as shown in diagrams 2a through 2f.
  • the inherent property of NPK granule should not be altered even after coating with zinc at the same time the coating process using binding cum anticaking agent should not have any interference with the granule dissolution process in presence of moisture. This could be achieved in this process.
  • Example 3 The third study established relative preference of zinc sulphate monohydrate over zinc sulphate heptahydrate as a source of Zn for the coating process as the zinc content on the zinc coat was relatively consistent when zinc sulphate monohydrate was used as a source (Diagram 3) of Zn in contrast to zinc sulphate heptahydrate which appears to be reacting with phosphorus there by reducing its availability. This study was performed at 1% zinc load as an example to show whether the process has any effect on reactivity with phosphorus. This objective could be achieved with zinc sulphate monohydrate because of its compatibility with the coating process.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Fertilizers (AREA)

Abstract

Le zinc est l'un des micronutriments les plus essentiels requis pour la productivité des cultures, la sécurité alimentaire et nutritionnelle pour le développement de la population mondiale. Comme la carence en Zn est largement répandue dans les sols, son application sous la forme d'engrais est essentielle. Une distribution de Zn conjointement avec d'autres nutriments majeurs tels que le phosphore à travers de simples granulés d'une manière rentable et efficace était un réel défi. Selon l'invention, un procédé d'enrobage par du sulfate de zinc monohydraté de granulés de NPK fabriqués industriellement a été conçu à l'aide d'un agent thixotrope, de liaison-antiagglomération dans des rapports idéals de 2: 1 et 3: 1 de sulfate de zinc monohydraté: agent de liaison-antiagglomération pour parvenir à une meilleure adhésion de particules sur la surface des granulés, facilitant une charge de zinc jusqu'à 2 % avec une ségrégation minimale. A l'aide de ce procédé d'enrobage, a été observée une disponibilité uniforme du zinc même en présence d'un taux élevé de phosphore soluble dans l'eau.
PCT/IN2010/000867 2009-12-30 2010-12-29 Procédé d'enrobage de granulés de npk par du sulfate de zinc monohydraté Ceased WO2011080764A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN3320/CHE/2009 2009-12-30
IN3320CH2009 2009-12-30

Publications (1)

Publication Number Publication Date
WO2011080764A1 true WO2011080764A1 (fr) 2011-07-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2010/000867 Ceased WO2011080764A1 (fr) 2009-12-30 2010-12-29 Procédé d'enrobage de granulés de npk par du sulfate de zinc monohydraté

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WO (1) WO2011080764A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103102223A (zh) * 2013-03-05 2013-05-15 孟庆华 一种棉花专用卵磷脂包膜缓释肥及其生产方法
CN103708531A (zh) * 2013-12-27 2014-04-09 萍乡宝海饲料添加剂有限公司 一水硫酸锌生产工艺方法
WO2014128468A1 (fr) * 2013-02-20 2014-08-28 Yara Uk Limited Enrobage d'engrais contenant des micronutriments
WO2016168801A1 (fr) * 2015-04-16 2016-10-20 The Mosaic Company Revêtements et additifs contenant des acides gras, des sels d'acides gras ou des composés similaires, destinés à être utilisés comme agents dépoussiérants et/ou antiagglomérants pour produits granulaires
US10487016B2 (en) 2015-08-12 2019-11-26 The Mosaic Company Acid treatment for fertilizers to increase zinc solubility and availability
US10654759B2 (en) 2013-08-19 2020-05-19 The Mosaic Company System and methods for addition of beneficial agricultural, biological, and/or dedusting additives to granular fertilizers
CN115427377A (zh) * 2020-03-31 2022-12-02 沙特基础工业全球技术公司 锌包覆的尿素肥料
US12077480B2 (en) 2017-09-29 2024-09-03 Koch Agronomic Services, Llc High solids suspension fertilizer
EP4330212A4 (fr) * 2021-04-28 2025-03-19 ArrMaz Products Inc. Nouvelles compositions chimiques pour obtenir un revêtement agronomique total contenant des micronutriments et/ou des biocatalyseurs
US12291493B2 (en) 2018-12-11 2025-05-06 SABIC Agri-Nutrients Company Organic chelated zinc coated fertilizer for better crops and soil health

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3560192A (en) * 1968-05-03 1971-02-02 American Cyanamid Co Micronutrient enriched granular fertilizers
AU712320B2 (en) * 1994-11-15 1999-11-04 Southstar Fertilizers Limited Granular fertiliser with supplemental coating
CN1587233A (zh) * 2004-08-09 2005-03-02 沈阳农业大学 玉米抗旱保水型包膜控释肥料及其制法
EP1627865A1 (fr) * 2004-08-17 2006-02-22 ARR-MAZ Products, L.P. Compositions de revêtement anti-mottante et anti-poussière contenant des sels métalliques d'acides gras dispersés dans liquide et leurs procédés d'utilisation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3560192A (en) * 1968-05-03 1971-02-02 American Cyanamid Co Micronutrient enriched granular fertilizers
AU712320B2 (en) * 1994-11-15 1999-11-04 Southstar Fertilizers Limited Granular fertiliser with supplemental coating
CN1587233A (zh) * 2004-08-09 2005-03-02 沈阳农业大学 玉米抗旱保水型包膜控释肥料及其制法
EP1627865A1 (fr) * 2004-08-17 2006-02-22 ARR-MAZ Products, L.P. Compositions de revêtement anti-mottante et anti-poussière contenant des sels métalliques d'acides gras dispersés dans liquide et leurs procédés d'utilisation

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Y S. SHIVAY ET AL.: "Relative yield and zinc uptake by rice from zinc sulphate and zinc oxide coatings onto urea", NUTRIENT CYCLING IN AGROECOSYSTEMS, vol. 80, no. 2, 2008, pages 181 - 188 *
Y. S. SHIVAY ET AL.: "Relative Efficiency of Zinc Sulfate and Zinc Oxide-Coated Urea in Rice- Wheat Cropping System", COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS, vol. 39, no. 7, 2008, pages 1154 - 1167 *

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014128468A1 (fr) * 2013-02-20 2014-08-28 Yara Uk Limited Enrobage d'engrais contenant des micronutriments
GB2513232A (en) * 2013-02-20 2014-10-22 Yara Uk Ltd Fertiliser coating containing micronutrients
GB2513232B (en) * 2013-02-20 2017-11-01 Yara Uk Ltd Fertiliser coating containing micronutrients
US9994492B2 (en) 2013-02-20 2018-06-12 Yara Uk Limited Fertiliser coating containing micronutrients
US10118867B2 (en) 2013-02-20 2018-11-06 Yara Uk Limited Fertiliser coating containing micronutrients
CN103102223A (zh) * 2013-03-05 2013-05-15 孟庆华 一种棉花专用卵磷脂包膜缓释肥及其生产方法
US10654759B2 (en) 2013-08-19 2020-05-19 The Mosaic Company System and methods for addition of beneficial agricultural, biological, and/or dedusting additives to granular fertilizers
US11084762B2 (en) 2013-08-19 2021-08-10 The Mosaic Company System and methods for addition of beneficial agricultural, biological, and/or dedusting additives to granular fertilizers
CN103708531A (zh) * 2013-12-27 2014-04-09 萍乡宝海饲料添加剂有限公司 一水硫酸锌生产工艺方法
WO2016168801A1 (fr) * 2015-04-16 2016-10-20 The Mosaic Company Revêtements et additifs contenant des acides gras, des sels d'acides gras ou des composés similaires, destinés à être utilisés comme agents dépoussiérants et/ou antiagglomérants pour produits granulaires
ES2658443R1 (es) * 2015-04-16 2018-04-10 The Mosaic Company Recubrimientos y aditivos que contienen ácidos grasos, sales de ácidos grasos, o compuestos similares, para uso como agentes antiaglutinantes y/o de eliminación de polvo para productos granulares.
US10487016B2 (en) 2015-08-12 2019-11-26 The Mosaic Company Acid treatment for fertilizers to increase zinc solubility and availability
US11807587B2 (en) 2015-08-12 2023-11-07 The Mosaic Company, Inc. Acid treatment for fertilizers to increase zinc solubility and availability
US12077480B2 (en) 2017-09-29 2024-09-03 Koch Agronomic Services, Llc High solids suspension fertilizer
US12291493B2 (en) 2018-12-11 2025-05-06 SABIC Agri-Nutrients Company Organic chelated zinc coated fertilizer for better crops and soil health
CN115427377A (zh) * 2020-03-31 2022-12-02 沙特基础工业全球技术公司 锌包覆的尿素肥料
EP4330212A4 (fr) * 2021-04-28 2025-03-19 ArrMaz Products Inc. Nouvelles compositions chimiques pour obtenir un revêtement agronomique total contenant des micronutriments et/ou des biocatalyseurs

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