二氧化锗碳热还原制备金属锗的热力学分析与实验研究
Thermodynamic Analysis and Experimental Research of Germanium Metal Preparation by Carbothermic Reduction of Germanium Dioxide
郭誉1
作者信息
- 1. 湖南有色金属研究院有限责任公司,湖南 长沙 410100
- 折叠
摘要
对二氧化锗直接碳热还原制备金属锗进行了热力学计算和模拟,并开展了验证实验,以探索金属锗短流程制备的可行性.首先,对GeO2-C和GeO2-C-O2 体系各反应的标准吉布斯自由能变进行计算;其次,对这两个体系的多相同时平衡进行模拟;最后,以纯二氧化锗和碳粉为原料在惰性气氛、900℃下进行还原实验.结果表明:在惰性气氛下,升高温度有利于GeO2 碳还原生成GeO和Ge;碳量越多,Ge生成量越大.在氧气气氛下,GeO2 的碳热还原产物有GeO和Ge,但氧气优先与碳反应生成CO2,不利于GeO2 还原过程的控制.还原实验产物为纯金属锗,直收率达到87.56%,证实了二氧化锗直接碳热还原制备金属锗的可行性.
Abstract
The thermodynamic calculation and simulation of direct carbothermal reduction of germanium di-oxide for preparation of germanium metal and the verification experiments were carried out to explore the feasibility of short process preparation of germanium metal.Firstly,the standard Gibbs free energy change of each reaction in GeO2-C and GeO2-C-O2 systems was calculated.Secondly,the multiphase simultaneous equilibrium of the two systems was simulated.Finally,the reduction experiment was carried out with pure germanium dioxide and carbon powder as raw materials in an inert atmosphere at 900℃.The results show that in the inert atmosphere,the increase of temperature is conducive to the carbothermal reduction of GeO2 to produce GeO and Ge,and more carbon result in greater Ge yield.In the oxygen atmosphere,carbo-thermal reduction products of CeO2 include GeO and Ge.However,oxygen preferentially reacts with car-bon to produce CO2,which is not conducive to the control of GeO2 reduction process.The product of the reduction experiment is pure germanium metal with a direct recovery rate of 87.56%,which proves the feasibility of direct carbothermic reduction of germanium dioxide to prepare germanium metal.
关键词
金属锗/二氧化锗/直接碳热还原/热力学计算/反应平衡模拟/实验研究Key words
germanium metal/germanium dioxide/direct carbothermal reduction/thermodynamic calcula-tion/reaction equilibrium simulation/experimental research引用本文复制引用
出版年
2024
NETL
NSTL
万方数据