Equilibrium in the system calcium oxide-phosphorus pentoxide-water
Equilibrium in the system calcium oxide-phosphorus pentoxide-water
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DOI：
10.1021/ie50364a030
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发表时间：
1940-01-01
影响因子：
--
通讯作者：
Farr, TD
中科院分区：
文献类型：
--
作者：
Elmore, KL;Farr, TD
关于用磷酸岩或石灰石和磷酸制备磷肥的实验，显然需要关于磷酸和它的钙盐之间平衡的更完整的数据。已发表的有关磷酸溶液中磷酸钙的相平衡数据（1、2、4、5）仅在25、40、50.7和80 ℃下延伸至磷酸浓度为51%、62%、86%和66%。，分别进行这项研究主要是为了将这些数据扩展到更浓的磷酸溶液和更高温度的区域。所完成的研究是在40、75和100 ℃下对磷酸钙在2%至98%磷酸溶液中的相平衡进行的研究，以及在25 ℃下在27.5%至98%磷酸溶液中。
IN CONNECTION with the experimental preparation of phosphate fertilizersfrom rock phosphate or limestone and phosphoric acid, it became evident that more com-plete data were needed on the equilibrium between phosphoric acid and its calcium salts. The published phase-equilibrium data (1, 2, 4, 5) concerningthe calcium phosphates in phos-phoric acid solutions extend only up to the concentrations of 51, 62, 86, and 66 per cent phosphoric acid at 25, 40, 50.7, and 80 C., respectively. This investigation was undertaken primarily to extend these data into the region of more concen-trated phosphoricacid solutions and higher temperatures. The study completed is a phase-equilibrium investigation of the calcium phosphates in 2 to 98 per cent phosphoric acid solutions at 40, 75, and 100 C., and in 27.5 to 98 per cent phosphoric acid solutions at 25 C.