Cr2O3碳化产物热力学分析

Thermodynamic analysis of Cr2O3 carbonization products

摘要:

为探究Cr₇C₃制备的工艺条件,对Cr₂O₃的碳化产物从热力学上进行了分析,采用标准反应热效应计算法对Cr₇C₃的制备进行了热力学模拟。研究了反应温度、反应气氛、物料配比对Cr₇C₃制备的影响,并对企业碳热还原电熔法制备的高纯Cr₇C₃的原理进行阐述。结果表明：Cr₇C₃最低生成温度为1368 K,提高反应温度有利于增加Cr₇C₃的产率；降低体系的CO分压有利于降低反应起始温度和Cr₇C₃的生成；Cr₇C₃可以与体系中的C发生碳化反应生成Cr₃C₂,提高反应温度和优化物料配比有利于抑制Cr₇C₃的过度碳化。

Abstract:

In order to study the technological conditions to prepare Cr₇C₃, the carbonization products of Cr₂O₃ were analyzed from the aspects of thermodynamics and the thermodynamic simulation of Cr₇C₃ was carried out by method of standard reaction thermal effect calculation. The effects of reaction temperature, reaction atmosphere and material ratio on the preparation of Cr₇C₃ were studied, and the principle of high purity Cr₇C₃ prepared by carbon thermal reduction method from the melt was explained. The results show that minimum formation temperature of Cr₇C₃ is 1368 K, the increase of the reaction temperature helps to increase the yield of Cr₇C₃; Lowering the CO partial pressure of the system is beneficial to reduce the initial temperature of the reaction and the formation of Cr₇C₃; Cr₇C₃ can react with C in the system to generate Cr₃C₂. Meanwhile increasing the reaction temperature and optimizing the material ratio are conducive to inhibit the excessive carbonization of Cr₇C₃.