Schematic of metal purification unit reactor: (1) charging crucible cover, (2) charging crucible, (3) first distillation crucible, (4) distillation crucible support, (5) distillation section supports, (6) second distillation crucible, (7) condenser, (8) receiving crucible (9) quartz retort (reactor), (10) distillation section retort, (11) gettering filter, (12), heaters, (13) distillation funnel, (14) corundum muffle, (15) flange connected to the gas a vacuum lines, (16) receiving crucible support, (17) ports of gas (inlet) and vacuum (outlet) lines.