High Temperature Decarbonization of Neodymium Sesquisulfide by Hydrogen, Hydrogen Sulfide and Ammonia
High Temperature Decarbonization of Neodymium Sesquisulfide by Hydrogen, Hydrogen Sulfide and Ammonia
复制标题
氢气、硫化氢和氨对三硫化二钕的高温脱碳
DOI：
10.2473/shigentosozai.114.971
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Y. Waseda
中科院分区：
文献类型：
--
作者：
N. Sato;T. Darjaa;Kohta Yamada;T. Fujino;Y. Waseda
本文研究了在4%H_2/N_2、H_2S和NH_3气氛中加热除去Nd_2S_3中碳杂质的方法。当将含有1，200质量ppm碳杂质的硫化物在4%H2/N2或H2S中在1，600 °C下加热1小时时，碳含量降低至600质量ppm。对于NH3气体，通过在1,000 ℃的较低温度下加热1小时，碳含量降低至850质量ppm。延长加热5小时导致碳含量进一步降低至600 ppm。讨论了碳与上述不同气体的反应机理，并讨论了与反应有关的自由能变化。在4%H_2/N_2和H_2S脱碳后观察到了由-到-Nd_2S_3的相变，而在1，000 ℃的NH_3低温处理过程中没有发生这种相变。
The removal of carbon impurity from Nd2S3 has been studied by heating in the gases of 4 % H2/N2, H2S and NH3. When the sulfide containing 1,200 mass ppm carbon impurity was heated in 4 % H2/N2 or H2S at 1,600 °C for 1 h, the carbon content decreased to 600 mass ppm. With NH3 gas, the carbon content decreased to 850 mass ppm by heating at a lower temperature of 1,000 °C for 1 h. Prolonged heating for 5 h resulted in further decrease of carbon content to 600 ppm. The mechanism of reaction of carbon with the above different gases is discussed in relation to the free energy change associated with the reactions. The phase transformation from - to -Nd2S3 was observed after the decarbonization with 4 % H2/N2 and H2S, while it did not occur during the low temperature processing at 1,000 °C in NH3.