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The apparatus used for reduction of NiO and NiCl2 in static conditions: 1: high-pressure hydrogen bottle, 2: reducing valve, 3: high pressure nitrogen bottle, 4: silica gel column, 5: copper powder column, 6: calcium-chloride column, 7: wash bottle with H2SO4, 8: rotameter, 9: electric resistance furnace with quartz tube, 10: silica sample carrier, 11: thermocouple, 12: water-cooled condenser, 13: water-cooling system, and 14: wash bottle.
