Production of DAP with the raffinate from purified WPA

The production of DAP with the raffinate from purified WPA is introduced.For the high contents of impurities such as R2O3,MgO in the raffinate,the effects of the raffinate on production operation and quality of DAP are analyzed.The percentage with the amount of total acid should be controlled to less than 20% or 40% to produce the superior DAP.