磷化工副产物磷铁加钴真空制备三磷化钴的热力学

doi:10.13385/j.cnki.vacuum.2021.05.17

真空 ›› 2021, Vol. 58 ›› Issue (5): 93-97.doi: 10.13385/j.cnki.vacuum.2021.05.17

磷化工副产物磷铁加钴真空制备三磷化钴的热力学

李秋霞, 普杰, 荆碧

云南师范大学化学化工学院,云南昆明 650500

收稿日期:2020-07-08 出版日期:2021-09-25 发布日期:2021-09-23
作者简介:李秋霞（1971-）,女,湖南省连源市人,博士,教授。

Thermodynamic Study on Preparation of CoP₃ from Ferrophosphorus by-Product of Phosphorus Chemical Industry

LI Qiu-xia, PU Jie, JING Bi

Faculty of Chemistry and chemical Engineering, Yunnan Normal University, Kunming 650500, China

Received:2020-07-08 Online:2021-09-25 Published:2021-09-23

摘要/Abstract

摘要： 本文应用“物质吉布斯自由能法”对磷铁制备三磷化钴CoP₃进行了系统的热力学研究。在298~1600K范围内,Fe₂P与Co反应生成三磷化钴CoP₃的ΔG由196.12kJ·mol^-1变化至146.22 kJ·mol^-1,Fe₃P与Co反应生成三磷化钴CoP₃的ΔG由442.38kJ·mol^-1 变化至399.21kJ·mol^-1,在所计算温度范围不可能制备三磷化钴CoP₃;加入适量的CaO和SiO₂后,相同温度下反应生成（3CaO·2SiO₂）和CoP₃的ΔG对应为-42.45kJ·mol^-1至-108.42kJ·mol^-1,同时计算了温度T从298K变化到700K时,其平衡常数K^θ为：2.73×10⁷至1.03×10⁴。研究结果表明：利用磷铁加Co和适量的CaO与SiO₂在温度低于700K真空条件下制备三磷化钴CoP₃,不仅可行而且反应彻底,为实验研究提供了热力学参数。

关键词: 热力学, 磷铁, 制备, 三磷化钴

Abstract: The“Gibbs free energy method” was used to study the thermodynamics of CoP₃ preparation by Fe₂P or Fe₃P and Co.The Gibbs free energy of the reactions varied from 196.12kJ·mol^-1 to 146.22kJ·mol^-1 and from 442.38kJ·mol^-1 to 399.21kJ·mol^-1, respectively, when the temperature is in the range of 298K to 1600K. It is impossible to prepare cobalt triphosphate CoP₃ in the calculated temperature range. The Gibbs free energy that the reaction to prepare cobalt phosphate and formation 3CaO · 2SiO₂ added appropriate amount of CaO and SiO₂ into the ferrophosphorus varied from -42.45kJ·mol^-1 to -108.42kJ·mol^-1 under the same temperature range. At the same time, the equilibrium constant of preparation of CoP₃ by Fe₂P is from 2.73×10⁷ to 1.03×10⁴ in the temperature range of 298K to 700K. The results show that it is not only feasible but also thorough that the CoP₃ can be prepared by adding Co and CaO and SiO₂ in ferrophosphorus under the temperature of 700K and in vacuum.It provides thermodynamic parameters for experimental study.

Key words: thermodynamics, ferrophosphorus, preparation, CoP₃

中图分类号:

O642.1

李秋霞, 普杰, 荆碧. 磷化工副产物磷铁加钴真空制备三磷化钴的热力学[J]. 真空, 2021, 58(5): 93-97.

LI Qiu-xia, PU Jie, JING Bi. Thermodynamic Study on Preparation of CoP₃ from Ferrophosphorus by-Product of Phosphorus Chemical Industry[J]. VACUUM, 2021, 58(5): 93-97.

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磷化工副产物磷铁加钴真空制备三磷化钴的热力学

Thermodynamic Study on Preparation of CoP₃ from Ferrophosphorus by-Product of Phosphorus Chemical Industry

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Thermodynamic Study on Preparation of CoP₃ from Ferrophosphorus by-Product of Phosphorus Chemical Industry