Acta Phys. -Chim. Sin. ›› 2000, Vol. 16 ›› Issue (01): 27-30.doi: 10.3866/PKU.WHXB20000106

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Studies on the lsothermal Solubility of the Systems CaSO4-Ca(H2PO4)-CO(NH2)2-H2O and Ca(H2PO4)2-CO(NH2)2-H2O at 25°C

Zhang Feng-Xing, Yang Qin, Cui Bin, Zhao Xiao-Li, Duan Chao-Yang   

  1. Department of Chemistry ,Northwest University,Xi'An 710069
  • Received:1999-03-23 Revised:1999-06-03 Published:2000-01-15
  • Contact: Zhang Feng-Xing


The titled quaternary system CaSO4-Ca (H2PO4 ) 2 - C O (NH2 ) 2 -H2O and its ternary boundary system Ca(H2PO4 )2-CO(NH2 )2-H2O have been investigated at 25℃ in order to develop complex fertilizer. One new compound Ca(H2PO4)2•CO (NH2)2 was found in the ternary system. There were two complex compounds Ca(H2PO4)2• CO(NH2 )2 and CaSO4• 4CO(NH2 )2.

Key words: Phase equilibrium, Solubility, Complex fertilizer, Urea, Calcium sulfate, Calcium phosphate