The fuming of lead and germanium sulfide.
Hager JP; Shanks R; Castro RZ
Proc Flash Reactor Processes Conf Salt Lake City Utah, 1988 Jun; 1:367-389
The vapor pressures of lead and germanium sulfide have been determined using a transpiration system where the sulfur potential in the carrier gas stream could be controlled. The results are represented by --pbs(s) = pbs(g) ^g deg. = 49,400-30.98.T;cal/g-mol(997-1,224 k); ges(s) = ges(g) ^g deg = 37,650-36.78.T; cal/g-mol(619-815 k). The vapor pressures are thought to be more accurate than those available previously. The pbs(g) pressures are approximately 12 pct lower and the ges(g) pressures approximately 220 pct higher than those calculated from standard reference data sources. The experimental results have been used to calculate fume loading levels at different temperatures. In the presence of arsenic sulfide vapor the vapor pressure of pbs(s) was found to be enhanced, presumably due to the formation of a vapor complex species. The vapor complex species is proposed to be pbass2(g). The thermodynamic results for germanium sulfide have been used to investigate the feasibility of fuming germanium from slag by means of the reaction-- geo2(1) + 4co(g) + so2(g) = ges(g) + 4 co2(g). The calculated pressures of ges(g) indicate that a flash reaction system, such as a flame reactor would be ideally suited to such a fuming process.
Robertson DGC; Sohn HY; Themelis NJ
Proc. Flash Reactor Processes Conf (Salt Lake City, Utah, June 15-17, 1988); Contract #G1125129-0851