The ability to make Aluminium would be alien technology to the ancient Egyptian culture. There’s a good reason it’s production was only discovered in modern times.

My guess is that you were thinking of Tutankhamun's meteoric iron dagger https://en.wikipedia.org/wiki/Tutankhamun%27s_meteoric_iron_... “Nineteen iron objects were discovered in the tomb of Tutankhamun, including a set of blades which appear very similar to those used in the Egyptian opening of the mouth ceremony (a ritual performed for the benefit of the deceased to enable an afterlife). These blades are also intricately linked to iron and stars, being described in temple inventories as composed of iron and were themselves frequently referred to as the stars. The other iron objects were wrapped with Tutankhamun's mummy; these include a miniature headrest contained inside the golden death mask, an amulet attached to a golden bracelet and a dagger blade with gold haft. All were made by relatively crude methods with the exception of the dagger blade which is clearly expertly produced. This suggests that the dagger was probably imported to Egypt perhaps as a royal gift from a neighboring territory, indicating that at this time Egypt's knowledge and skills of iron production were relatively limited. Only further analytical testing can confirm if all of these artifacts are made from meteorite iron but they do appear to suggest that iron was a material used to indicate high status at the time of Tutankhamun's death in approximately 1327 BC.”.