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二氧化锗碳热还原制备金属锗的热力学分析与实验研究
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作者 郭誉 《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
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;... 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。 展开更多
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
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Simulation calculation of solubility of insoluble compound M_mA_a in complex system
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作者 杨天足 张杜超 吴江华 《Journal of Central South University》 SCIE EI CAS 2012年第4期892-896,共5页
A simulation calculation model for the solubility of insoluble compound MmAa in complex system was established.According to coordination equilibrium principle,relevant dissociation reaction,complexation reaction,self-... A simulation calculation model for the solubility of insoluble compound MmAa in complex system was established.According to coordination equilibrium principle,relevant dissociation reaction,complexation reaction,self-complexation reaction and protonation reaction during insoluble compound dissolving were considered and then the mass balance equations about solubility calculation were obtained.In the case analysis,the solubility of silver chloride in ammonia system was obtained by simulation calculation,and curved surface charts of thermodynamic equilibrium about the total concentration of silver ions,pH and concentration of ammonia ions were drawn correspondingly.The results show that under the conditions of room temperature and 6 mol/L ammonia concentration,the calculated solubility value of silver chloride(34 g/L) is close to the actual value(31 g/L),demonstrating that this model is suitable for solubility calculation of insoluble compound MmAa in the complex system. 展开更多
关键词 complex system insoluble compound SOLUBILITY calculation model
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