What Should I Pay Attention To When Using A Nickel Crucible？

Nov 28, 2019

The melting temperature of nickel crucible should not exceed 700 ℃, because nickel is easy to be oxidized at high temperature.

Nickel crucibles cannot be used for the cauterization of precipitation. Nickel crucible is suitable for melting samples of NaOH Na2O2, Na2CO3 NaHCO3 and basic solvent containing KNO3, but not for melting samples of acidic solvents such as KHSO4 or NaHS04, K2S2O7 or Na2S2O7 and basic sulfide flux containing sulfur. Metal salts such as A1, Zn, Pb, Sn and Hg in molten state can make nickel crucible brittle.

Borax also cannot be melted in a nickel crucible.

Nickel crucible often contains trace chromium.

The new nickel crucible should be first seared to a bluish purple color in the muffle oven to remove the grease from the surface, then boiled for a while with 1:20 HCl, then rinsed with water.