The use of granulated product is more beneficial than the use of powder. The powder get dissolved immediately in irrigation water and becomes readily available. Some part of it is used by plants and balance goes to sub soil with water and remain useless. The powder can be used only during sowing of seeds. It cannot be used on the growing crops as it get deposited on the leaves of the plants and being slightly acidic, burns them. The granulated product rolls down the plant and can be used harmlessly on the standing crops. The biggest advantage in using the granulated product is that it is available to the crops for a longer time because it get dissolved slowly in water.
The cured Single Super Phosphate is Screened. The powder is taken directly and the lumps are taken after crushing, for granulation . The soil conditioner gypsum is a added . The material is taken to granulation drum where very fine spray of water is done on rolling material at its angle of repose. Some coating of powder over the small nuclei / particles takes place. This duration of this process is controlled as per requirement. The material is then taken to dryer drum where the hot air generated in the furnace is passed through it. The material is cooled in cooler drum by passing ambient air through it. The ID fans connected to dryer & cooler sucks air from the drums so some dust also comes with it. The dust is separated in the cyclones and finally scrubbed in wet scrubber. The cooled material is screened through under size & over size screens. The product of 1 - 4 mm size is separated and precisely packed. The oversize material after crushing and the under size are recycled and work as nucleus for next cycle