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GeO_(2)-C和GeO_(2)-C-O_(2)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GeO_(2)碳还原生成GeO和Ge;碳量越多,Ge生成量越大。在氧气气氛下,GeO_(2)的碳热还原产物有GeO和Ge,但氧气优先与碳反应生成CO_(2),不利于GeO_(2)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。
The thermodynamic calculation and simulation of direct carbothermal reduction of germanium dioxide 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 GeO_(2)-C and GeO_(2)-C-O_(2) 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 GeO_(2) to produce GeO and Ge,and more carbon result in greater Ge yield.In the oxygen atmosphere,carbothermal reduction products of CeO_(2) include GeO and Ge.However,oxygen preferentially reacts with carbon to produce CO_(2),which is not conducive to the control of GeO_(2) 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.
作者
郭誉
GUO Yu(Hunan Research Institute for Nonferrous Metals Co.,Ltd.,Changsha 410100,China)
出处
《稀有金属与硬质合金》
CAS
CSCD
北大核心
2024年第6期28-33,共6页
Rare Metals and Cemented Carbides
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
germanium metal
germanium dioxide
direct carbothermal reduction
thermodynamic calculation
reaction equilibrium simulation
experimental research
