Investigation on the Phosphate Rock Dissolution Process by Partial Acidulation (PAPR Method) Using Sulfuric and Phosphoric Acid

The results of few factors on the each form of phosphates content in the PAPR-type fertilizer preparations were presented. Type of mineral acid, its concentration, amount and fineness were taken into account. Investigation was carried out with the recommendations enclosed in Regulation (EC) No 2003/2003 of the European Parliament and the Council on 13.10.2003 related to fertilizers, test methods for the phosphate content evaluation in fertilizers.