Preparation of Terbium Sesquisulfide and Holmium Sesquisulfide by Sulfurization of Their Oxide Powders Using CS_2 Gas

The formation behaviors of terbium sesquisulfide(Tb_2S_3)and holmium sesquisulfide(Ho_2S_3)synthesized via the sulfurization of their oxide powders using CS_2 gas in the range of temperature 673 to 1323 K were investigated. In the sulfurization of Tb_4O_7 powder, Tb_2O_3 and Tb_2O_2S were formed in the initial stage of reaction, and α-Tb_2S_3 was finally formed at higher temperature. For long sulfurization time of 8 h, single-phase α-Tb_2S_3 could be synthesized at 1323 K. In the sulfurization of Ho_2O_3 powder using CS_2 gas, only Ho_2O_2S was formed as an intermediate product. At a sulfurization temperature above 873 K, Ho_2O_2S was formed in the initial stage of reaction, and single-phase δ-Ho_2S_3 was formed at 1323 K for 8 h instead of Ho_2O_2S. Furthermore, the influence of the addition of carbon black to the sulfurization of Ho_2O_3 powder using CS_2 gas was investigated, and the result implied that the reactions were accelerated slightly by the addition of carbon black.

Electrode heating effects on preparation of Al-65V alloy

In this study,Al-65V alloy has been produced by electrode heating for 3−15 min.The impurities content,microstructure and the vanadium content of the alloy in the slag are investigated.The results indicate that different heating time shows obviously impacts not only on the impurities and microstructure of AlV alloy,but also on the vanadium recovery rate of slag.The impurities contents of C,O and N are 0.085%,0.022%and 0.036%,respectively,which meet the commercial standard when the electric heating time is controlled to 10 min,and the content of vanadium in slag is 0.18%.