Production method for feed grade particulate calcium dihydrogen phosphate

The present invention relates to a production method for feed grade particulate calcium dihydrogen phosphate The method comprises the following steps of: step 1. purifying wet process phosphoric acid with a mass concentration of phosphorus pentoxide at 40-45 wt% to a feed-grade level standard; step 2. grinding natural calcium carbonate ore to fine powder, wherein the fine powder with the fineness which is 100 meshes is greater than 90%; and a concentration of CaCO3 in natural calcium carbonate fine powder is greater than 95 wt%; step 3. in accordance with a Ca/P ratio in the range of 0.56-0.65, performing a proportion measurement reaction, producing a semifinished product of calcium dihydrogen phosphate, adding feed grade particulate calcium dihydrogen phosphate revert into the semifinished product, wherein an index thereof accrods with a GB22549-2008 standard; step 4. drying, wherein during drying, hot air inlet temperature is 300-600 DEG C, drying device outlet temperature is 80-110 DEG C, and moisture content of a finished product after drying is 1-4 wt%; and step 5. performing granulation and sieving on the finished product obtained in the step 4, sending a finished product of particulate calcium dihydrogen phosphate at 20-80 mesh to a packaging process and perform packaging to obtain a final product, wherein a material larger than 20 meshes is ground and used as a revert together with the finished product that is smaller than 80 meshes.