The melting point of nickel is 1 450℃ and it is easy to be oxidized when it is burned in the air, so the nickel crucible cannot be used for burning and weighing precipitation.

Nickel has a good resistance to alkaline corrosion, so it is mainly used for melting alkaline flux in the laboratory.

Temperature control

Alkaline fluxes such as sodium hydroxide and sodium carbonate can be fused in a nickel crucible at a melting temperature generally less than 700℃.

The sodium oxide can also be melted in the nickel crucible, but the temperature should be less than 500℃ and the time should be short, otherwise, the erosion will be serious, and the content of nickel salt brought into the solution will increase, becoming impurities in the determination.

Attention

Potassium pyrosulfate, potassium bisulfate and other acidic solvents and sulphide containing solvents should not be used for nickel crucible.

To melt sulfur - containing compounds, an oxidation environment with excess sodium peroxide should be used.

Molten aluminum, zinc, tin, lead and other metal salts can make a nickel crucible brittle.

Silver, mercury, vanadium compounds and borax cannot be burned in a nickel crucible.