The vapour pressure of magnesium in the thermal reduction of MgO by ferrosilicon

The Vapor Pressure of Lithium in the Reduction of Lithium Oxide by Silicon

“…S -l i a y cliffractometer investigations on the solid residue revealed the presence of dicalcium silicate, excess CaO, and excess FeSi. The diffractometer traces also showed the presence of other compouilds which could not be identified, suggesting that equation [2] is not the only reaction occurring.…”

“…The reaction [2] as proposed by Iiroll and Schlechten (1) served as a basis for the calculations. Experiments were performed in which the reaction was completed in vacuo.…”

“…For these calculations, the solids as predicted by reaction [2] were assumed to be present as pure, distinct phases; thus, their activities were equated to unity and the lithium vapors present were assumed ideal; hence, the equilibrium constailt was written in the form Kp = ( P L~)~. The therinodyilamic data used for the calculated values of the equilibrium coilstailt were taken from Kubaschewslii and Evans (6), Coughlin (7), and Kelley (8).…”

“…Assuming that the major reaction is reaction [2], equilibrium constants were comp~ited and plotted against l/TO I<., both from the experimental values and from the calculated values for the reaction. The experimental values are shown in Table I1 and Table I11 and are also plotted in Fig.…”

“…Frorn preliminary experiments, it was found that the reaction pressure of lithiurn in the reduction process was in the order of 5 rnm. Hg a t 1000" C. As a result, the entrainment method was adopted, similar to that used by Pidgeon and Icing (2) and later by Ellingsgaeter and Rosenqvist (3) in their examination of reaction [I].…”