aGermanium is extracted as its tetrachloride from flue dust by treating it with one to two times the theoretical quantity of hydrofluoric acid to convert all the silica present to silicon tetrafluoride, 锗被提取作为它的四氯化物从烟道灰通过对待它以一到二倍氢氟酸的理论数量转换所有硅土当前成硅...