粗銅の真空吸上げ精製
銅熔錬における真空吸上げ精製法 (第2報)
1972 年 88 巻 1012 号 p. 347-352
詳細
1972 年 88 巻 1012 号 p. 347-352
Molten blister copper taken in situ from an operating converter was refined under reduced pressures of around 1mmHg with a vacuum lift apparatus (the D-H process) using the melt of 6kg.
Sulphur and oxygen in the blister copper were rapidly removed as SO2 gas when nearly the same concentrations of sulphur and oxygen were initially contained in the melt, and the vacuum lifts of 14 times corresponding to the recirculation of about 2 resulted in the final concentrations of %S=%O=0.02, which were approximately the values in equilibrium with the reduced pressure. Another impurities were simultaneously more or less eliminated: 40% of Pb, 20% of As, and 40% of Sb.
A model for the vacuum lift process has been presented and an average value of 0.26 for the removal of Sand O in one lift was obtained.
