Triple superphosphate
This material is much more concentrated fertilizer then ordinary superphosphate it contains from 45 to 46% of available P2O5 of nearly three times the amount in the regular superphosphate.
Chemical reaction:
It is made by action of phosphoric acid on phosphate rock. The pulverized phosphate rock is mixed with phosphoric acid into a two stage reactor. The resultant slurry is sprayed into the granulator The product from the granulator is dried, screened, the oversize crushed and cooled again. Final product is conveyed to bulk storage where product is cured 4 to 6 weeks. During curing further reaction of acid and rock occurs which increases the availability of P2O5 for plants as food. Exhaust gases from granulator and cooler are scrubbed with water to remove silicofluorides.