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Wet Method Phosphoric Acid Production

   Phosphoric acid is an important industrial acid used for fertilizer manufacturing and it is also used in food production.  Click on the link below for a simply process flow diagram, with a description found below.

Process Flow Diagram

    Phosphate rock in the form of fluoroapatite is fed to a series of reactors along with recycled phosphoric acid from the process.  The phosphoric acid-fluoroapatite slurry is mixed with sulfuric acid which is added to the reactor series as a leaching agent.  After completing the reaction series, the process stream is washed with evaporator condensate while being forced through a filter.   The filtercake is composed primarily of gypsum (CaSO4 2H2O). The product acid is concentrated to 75-100% by a series of evaporators and then cooled before entering storage.

Primary Reactions:

Ca3(PO4)2 + 4H3PO4 ---> 3Ca(H2PO4)2
3Ca(H2PO4)2 + 3H2SO4 + 6H2O ---> 3CaSO4 6H2O + 6H3PO4
Reaction temperatures range from 105 0F to 175 0F, decreasing through the process.

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