What are nickel crucibles suitable for?

What are nickel crucibles suitable for?

Nickel crucibles are suitable for melting samples with NaOH, Na2O2, Na2CO3, NaHCO3 and alkaline solvents containing KNO3, but not for melting samples with acidic solvents such as KHSO4 or NaHS04, K2S2O7 or Na2S2O7 and alkaline sulfide flux containing sulfur.

Molten metal salts such as Al, Zn, Pb, Sn, Hg, etc. can make nickel crucibles brittle. Borax cannot be melted in nickel crucibles either.

Nickel crucibles often contain trace amounts of chromium, so be careful when using them.

New nickel crucibles should be burned in a muffle furnace to turn blue-purple, remove oil stains on the surface, then boil them with 1:20 HCl for a while, and then rinse them with water.

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