Separation of alumina in normally performed employing what is known as the Bayer Method. This will involve crushing the bauxite right into a powder, mixing it with h2o to generate a slurry, heating and including caustic soda (NaOH). In many people, aluminium is just not as toxic as heavy metals. https://fitnesstipsday.newsbloger.com/29179729/aluminium-no-further-a-mystery