Investigation of the Influence of Temperature of Washed Water on the Main Indicators of Fertilizer Precipitate

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 80-90oC of both phosphate raw materials (PRM). Under optimal parameters, the following formulations of fertilizer precipitates (weight.%) are obtained:P2O5total.=21.60-22.65;P2O5acceptable by citric acid=11.42-12.19; P2O5water solubility=2.08-2.20; CaOtotal.=40.89-41.40; CaOacceptable by citric acid.=22.12-23.07; CaO water solubility=4.03-4.26; Ntotal.=1.69-1.79 based on MM and P2O5total.=24.86-26.07; P2O5acceptable by citric acid=13.19-14.08; P2O5water solubility=2.40-2.57; CaOtotal=45.19-45.41; CaOacceptable by citric acid=24.54-25.37; CaOwater solubility=4.25-4.48; Ntotal.=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.