Hiroshima University and Aisin Cosmos R and D, which is a subsidiary of Aisin Seiki, jointly developed a technology to recover rare earthes contained in waste high-tech products using biotic DNAs. They made the DNAs of salmon and trout adsorb rare earthes and inpoured an acid aqueous solution to them, and successfully recovered such rare earthes as neodymium and dysprosium to higher than 90% purity.
The research team focused attention on the fact that the phosphate group contained in DNA adsorbs rare earthes. In the experiments, research members filled a plastic cylinder with cellulose combined with DNAs and inpoured a solution containing various kinds of rare earthes, and subsequently inpoured low-concentrated hydrochloric acid. This method allowed them to recover neodymium, dysprosium, and cerium independently.
Recovering rare earthes using salmon milts