NATURLIGT DEFLUORERAT KALCIUMFOSFAT ANVENDBART SOM DJURFODER

摘要

Calcium phosphate for use in animal feedstuffs having the following characteristics: total P 15 to 21% by weight F < 0.2% Ca >/= 25% Na 6 - 10% As < 10 ppm crystalline Na3Ca6(PO4)5 > 70% crystalline apatite < 1% crystalline beta -Ca3(PO4)5 < 5% citric solubility > 90%, is made by (a) adding H3PO4 to phosphate ore and after at least 5 minutes, adding Na compound and recycled fines from (c) with ratios controlled to give CaO:Na2O:P2O5 molar ratio in product of 7.6 - 3.6: 1 : 2.9 - 1.5. (b) granulating while drying at above 100 DEG C with hot gases from (d); (c) grading granules to 0.5 - 5mm with recycle of fines to (a); (d) calcining selected granules at 1100-1300 DEG C using hot air from (e) to support combustion and (e) tempering in air at less than 800 DEG C for less than 2 minutes.