Phosphate rock partially acidulated

Partially Acidulated Phosphate Rock. Not all phosphate rock is suitable for direct application and may require the addition of a more soluble form of phosphate. An alternative is partial acidulation to render its P205 more available. The partially acidulated phosphate rock (PAPR) process depends on treating ground phosphate rock with only a portion of the stoichiometric value of acid, for example 50 percent PAPR.19 The amount of water-soluble phosphate in PAPR varies according to the degree of acidulation. The crop response to the product is often quite similar to fully acidulated products such as SSP or TSR... 

Pelovski, Y., and Garrett, M. K., Partially Acidulated Phosphate Rock Fertilisers—Agronomic, Environmental and Production Aspects, Proceedings No. 364, The Fertiliser Society. 

In some instances, an indigenous phosphate rock may prove unsuitable for direct appUcation and require the addition of a more soluble form of pho hate. An alternative is partial acidulation to render ite P2O5 more available. This option is of particular interest since the crop response is often similar to that obtained when using fully addulated products such as SSP or TSP. In this situation, less add is used, and production capxadty may be increased. 

The partially acidulated phosphate rock (PAPR) process depends on treating grourxi phosphate rock with only a portion of the stoichiometric value of add, for example 50% PAPR. The amount of water-soluble phos- phate in"PAPR"varies according to the degree of acidulation. 

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