Triple super phosphate

Triple super phosphate

1. TRIPLE SUPER PHOSPHATE Prepared by- Mr. Vishal B. Thakare ( M.Tech Chemical, SVNIT Surat) Assistant Professor, PARUL UNIVERSITY Vadodara [email protected]

2. TRIPLE SUPERPHOSPHATE (TSP) Triple superphosphate (TSP) is the more concentrated fertilizer than ordinary superphosphate, containing from 44 to 51% of available P 2 O 5 or nearly three times the amount in the regular superphosphate. Triple superphosphate, also known as concentrated superphosphate, contains 45 to 50% monocalcium or water-soluble phosphate TSP is manufactured by adding phosphoric acid to rock phosphate, producing mainly water-soluble monocalcium phosphate with no calcium sulfate.

3. Raw Materials Basis: 1000kg Triple superphosphate Phosphate rock = 386kg Phosphoric acid = 540kg Power = 40kWH Steam = 20kg Reaction CaF 2 + 3Ca 3 (PO 4 ) 2 + 14H 3 PO 4 10Ca(H 2 PO 4 ) 2 + 2HF Triple super phosphate

4. 95 to 98% of the ground rock phosphate, passed through 100 mesh sieve, is mixed with phosphoric acid (1kg rock phosphate of 34% P 2 O 5 is mixed with 2.6kg acid). The acid is of commercial grade with P 2 O 5 content of 52%. Finely ground phosphate rock and 62% H 3 PO 4 are charged continuously to the granulator, where reaction and granulation take place. The den step, of TSP is faster (10-30min) than that for SSP (30-120min). The mixture from the reaction vessel goes to the den where it solidifies. Fines from the product screen are recycled to the granulator, and the moisture and temperature required for proper granulation are maintained by addition of water and/or steam.

5. Fumes are scrubbed with water sprays to remove acid and fluoride before being exhausted to the atmosphere. The granulator is a cylindrical vessel rotating about a horizontal axis and has in overflow dam at the discharge end. The granules overflow the dam into the rotary cooler, where they are cooled and dried slightly by counter current flow of air. The exhaust gases from the cooler pass through the cyclone, where dust is collected and returned to the granulator as recycle, the cooled product is screened, the coarse material being milled and returned, along with the fines, to the granulator. The product is then conveyed to bulk storage, bagging and shipping