Method for producing feed calcium hydrogen phosphate

A process for producing calcium hydrogen phosphate feed features that before reaction of phosphorus ore and sulfuric acid, the phosphorus ore is pre-treated by wet phosphoric acid for removing impurities and reducing consumption of sulfuric acid, the pre-neutralizing step is divided into two steps, and the thick slurry separated out in the second pre-neutralizing is returned to the point before the first pre-neutralizing for being dissolved by used wet phosphoric acid. Its advantages are high output rate increased from 60:40 to 85:15 or 90:10.