|
|||||
|
|
| THERMODYNAMICS STUDY ON THE DECOMPOSITION OF CHROMITE WITH KOH | |
| 作者姓名： | Z. Sun S.L. Zheng Y. Zhang |
| 作者单位： | Z. Sun1，2)，S.L. Zheng1)，and Y. Zhang1) 1) Institute of Process Engineering，Chinese Academy of Sciences，Beijing 100080，China 2) Graduate University of the Chinese Academy of Sciences，Beijing 100049，China |
| 摘 要： | Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process. |
| 关 键 词： | 铬铁矿 热力学 分解 氧化性 |
| 收稿时间： | 2006-09-21 |
| 修稿时间： | 2006-09-212007-01-16 |
Thermodynamics Study on the Decomposition of Chromite with KOH |
|
| Z. Sun S.L. Zheng Y. Zhang.THERMODYNAMICS STUDY ON THE DECOMPOSITION OF CHROMITE WITH KOH[J].Acta Metallurgica Sinica(English Letters),2007,20(3):187-192. | |
| Authors: | Z Sun SL Zheng Y Zhang JY Zhang |
| Affiliation: | 1. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China;Graduate University of the Chinese Academy of Sciences, Beijing 100049, China 2. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China 3. Mechanical Engineering College, Tianjin University of Technology,Tianjin 300191,China |
| Abstract: | Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature,which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process. |
| Keywords: | chromite KOH thermodynamics decomposition CHROMITE DECOMPOSITION STUDY superior conventional chromate production process comparison general alkali methods addition higher temperature thermodynamic increase decrease stable equilibrium above different |
| 本文献已被 CNKI 维普 万方数据 ScienceDirect 等数据库收录！ | |
| 点击此处可从《金属学报(英文版)》浏览原始摘要信息 | |
| 点击此处可从《金属学报(英文版)》下载全文 | |
