Current Journal of Applied Science and Technology

The influence of the temperature of washing water on the main indicators of fertilizer precipitates obtained on the basis of mineralized mass (MM) and phosphorite flour (PF) has been studied. For laboratory experiments, MM with the following composition (weight, %) were used: 14.60-P₂O₅, 43.99-CaO;14.11-CO₂, 1.58-SO₃; CaO:P₂O₅=3.01 and PF, which has the following composition (weight,%):17.76-P₂O₅, 47.51-CaO; 5.27-i.r.; CaO:Р₂О₅=2,68. The optimal temperature of washing water can be considered 80-90^oC of both phosphate raw materials (PRM). Under optimal parameters, the following formulations of fertilizer precipitates (weight.%) are obtained:P₂O_5total.=21.60-22.65;P₂O_{5acceptable by citric acid}=11.42-12.19; P₂O_{5water solubility}=2.08-2.20; CaO_total.=40.89-41.40; CaO_{acceptable by citric acid.}=22.12-23.07; CaO _{water solubility}=4.03-4.26; N_total.=1.69-1.79 based on MM and P₂O_5total.=24.86-26.07; P₂O_{5acceptable by citric acid}=13.19-14.08; P₂O_{5water solubility}=2.40-2.57; CaO_total=45.19-45.41; CaO_{acceptable by citric acid}=24.54-25.37; CaO_{water solubility}=4.25-4.48; N_total.=1.78-1.90 based on PF. The degree of washing of fertilizer precipitates from Ca(NO₃)₂ is 97.82-98.01 and 97.75-97.98%, respectively for MM and PF.