Ca$3($PO$4)2+3$H$2$SO$42$H$3$PO$4+3$CaSO$4$

The dihydrate process for the production of phosphoric acid is increasingly important as the basis for phosphate fertilizer plants. The process involves dissolution of phosphate rock in a concentration of sulfuric acid and subsequent crystallization of calcium sulfate dihydrate from the product phosphoric acid solution. Initially, the dissolution process is fast and is controlled by chemical reaction between rock and acid. In the second stage, when the particles are coated by calcium sulfate dihydrate the dissolution process is slow and controlled by mass transfer of acid through the coating layer.

Based on chemical reaction above and the information, draw process block diagram with feed,product,byproduct and all the equipment involved and also draw the process flow diagram $($PFD$)$ of the process.