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

Abstract

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.

Study on the composition of phosphorus fertilizers obtained on the basis of Kizilkum phosphorites and nitric acid

“…The work was carried out to increase the components of phosphate fertilizers by washing them with calcium nitrate. On the basis of MM , phosphate fertilizers containing 21.64 % -22.65 % P 2 O 5 was obtained [9].…”

“…The process of obtaining nitrogen-phosphorus-calcium-containing fertilizers (NPCa) by partial isolation of calcium nitrate from the decomposition products of Kyzylkum phosphate rock at reduced rates of nitric acid is carried out by various methods [10,11]. Phosphorus fertilizers and precipitates were obtained by Giyasidinov et al by decomposition of Central Kyzylkum phosphorites with nitric acid [12]. The essence of the above works is based on the determination of the rate of acid required to obtain dicalcium phosphate.…”