Phosphoric acid (PA FOOD GRADE)                                       
RAs（catalyst）
↓
yellow phosphorus→melt→ combustion（700℃）→hydration→dearsenification (70℃)
                                                            ↓
                                 packing ←desaeration (70℃) ← filtration 
 
Phosphoric acid is produced by Thermal process—Put the melting yellow phosphorus into the burning tower and burn it with oxygen ,which will produce phosphorous pentoxide . The phosphorous pentoxide together with water become phosphoric acid,then add catalyst to dearsenify .The flowing are filtration、desaeration and packing。
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