节点文献
体系Ga(H2PO4)2-CO(NH2)2-H2O和CaSO4-Ca(H2PO4)2-CO(NH2)2-H2O 25℃时研究
Studies on the Isothermal Solubilities of Systems Ca(H2P04)2-CO(NH2)2-H2O and CaSO4-Ca(H2PO4)2-CO(NH2)2-H2O at 25℃
【Author】 ZHANG Fengxing CUI Bin GUO Zhizhen SHIQizhen (Physico-inorganic Chemical Institute,Northwest University,Xi’an 710079)
【机构】 西北大学物理无机化学研究所;
【摘要】 本文首次报道了题头三元和四元体系溶度研究结果,并绘制了溶度图。该三元体系中形成的新相组成确定为Ca(H2PO4)2·CO(NH2)2;四元体体系在25℃时的溶度盐分投影图上有5个单饱面、7条单变线和3个四元无变点。相图指出了有普钙中磷酸二氢钙和硫酸钙成分与脲作用转变为品质更好的络合复肥的体系组成。
【Abstract】 The isothernal solubility diagram of the title ternary system Ca(H2PO4)2- CO(NH2)2-H2O and quaternary system CaO4-Ca(H2PO4)2-CO(NH2)2-H2O have been constructed st 25℃.The new compound in the ternary system is Ca(H2PO4)2·CO (NH2)2;There are 5 crystallization fields corresponding to CaO4·2H2O, Ca(H2PO4)2·H2O,CO(NH2)2,Ca(H2PO4)2.CO(NH2)2 and CaO4·4CO(NH2)2,respectively; 7 monovariantlines and three quaternary invariant points corresponding to: E1:Ca(H2PO4)2·H2O+Ca(H2PO4)2·CO(NH2)2+CaO4·2H2O; E2;Ca(H2PO4)2·CO(NH2)2+CaO4·2H2O+CaO4·4CO(NH2)2; E3:CO(NH2)2+Ca(H2PO4)2·CO(NH2)2+CaO4·4CO(NH2)2.
【Key words】 phase equilibrium; calcium biphosphate; calcium sulfate; urea.;
- 【会议录名称】 第九届全国相图学术会议论文集
- 【会议名称】第九届全国相图学术会议
- 【会议时间】1997-10
- 【会议地点】中国北京
- 【分类号】TQ440.1
- 【主办单位】中国物理学会相图专业委员会