Granular fertilizer has a very beneficial effect on plant growth, by regulated release of nutrients, by avoiding washing away of fertilizer salts, and by making NPK application uniform. Poor storage conditions and long storage without conditioning result in formation of lumps and powder thereby the benefits of granulation/prilling are largely lost by non uniform application, washing away of powdery fertilizer, and also making mechanical application of fertilizer impossible. This poor conditioning can lead to a sizable percentage reduction in yields of the farm; all this when a considerable amount of capital is deployed and cost is incurred in NPK/urea plants especially to provide granular/prilled product.
Prevention of such caking of fertilizer and making the fertilizer retain its customer values, are achieved by providing a uniform coating of cationic/anionic complex forming chemical formulations, in the final steps of manufacturing process of fertilizer.
OAN Industries provide complete range of Anticaking agents, help preserve the granular nature of the fertilizer. A wide variety of chemicals of specific nature are required to effectively prevent caking of fertilizers, depending on Weather for NPK/DAP/AN/AS/CAN etc.
Factors contributing to caking of fertilizers are Hygroscopicity, Moisture Content, Granular Size, Pressure, Ambient Temperature and Storing Conditions.
Silicon dioxide, granulation aid calcium silicate, iron ammonium citrate, and yellow prussiate of soda are all common anti-caking agents. Because of their names, certain anti-caking compounds have recently been causing worry. Because the chemical compound contains cyanide, a known toxin and a popular Hollywood poison, sodium and potassium ferrocyanide are dreaded. Regular table salt, on the other hand, may be regarded to be the same. Salt is made up of chloride (a poison) and sodium (also a toxin). The bonds of sodium chloride and ferrocyanide can break in acidic environments, but stomach acid isn’t strong enough to cause these reactions. Another issue is aluminium, which is utilised in anti-caking treatments.
Factors contributing to Fertilizer Caking
One of the primary causes of caking in fertilizers is their Hygroscopicity. It is well known that all commercial salts exhibit a higher level Hygroscopicity at critical humidity than pure salts due to minor impurities contained. One also has to consider the environmental relative humidity at various points of distribution, right up to the end-user storage. The hygroscopic nature of the fertilizer increases their tendency to bind together and cake on storage.
Fertilizer granules always carry a certain amount of moisture due to limitations in achieving complete drying of a fertilizer product. The varying humidity conditions during the storage of a fertilizer product and constant repeated phenomenon of migration of saturated solution to the neck of the adjacent fertilizer granule and its recrystallization resulting in the formation of strong bonding is continuously observed.
The granular Size, Shape, Strength, Uniformity and Porosity of the fertilizer are other factors that determine the extent of severity in the caking of fertilizers. Large sized uniform granules exhibit low bond strength power unit mass on storage and hence caking observed in such condition is generally low. Small sized uniform spherical granules show medium bond strength per unit mass on storage. Caking tendency is more than that observed with large sized uniform spherical granules. Granules in wide size rage exhibit severe caking tendency due to very much increased number of contact points. Bond strength per unit mass of the fertilizer is very high in this case.
Our Anticaking agents are aimed at providing a comprehensive solution to the problem of caking, moisture adsorption and nitrogen loss in granulated fertilizers. The anticaking agents consist of a combination of powerful surfactants, surface tension modifiers, parting agents and crystal habit modifiers in a suitable carrier medium.
Our Anticaking agents provide a complete solution to various problems faced by the fertilizer manufacturer. We have successfully supplied its anticaking agents in the Asian and Middle Eastern markets, with proven quality and performance.