STUDY ON THE SYNTHESIS OF 1 nm MANGANATE AND ITS CATION SUBSTITUTION CHARACTERISTICS

The key factor to synthesize the 1 nm manganate is to properly control the oxidation degree of the products, otherwise the products will mostly be the mixtures of 1 nm manganate with other manganates. The experiment on the substitution of 1 nm manganate with divalent cations indicates that 1 nm manganate has very strong cation substitution capacity, and it is inferred to be one of the main reasons why the oceanic polymetallic nodule could enrich such high contents of valuable metal elements such as Cu, Co and Ni. Different cations have different substitution abilities in the cation substitution reaction with 1 nm manganate. The preference sequence of cation substituted into 1 nm manganate is Cu~(2+) Co~(2+) Zn~(2+ )≥~( )Ni~(2+) Ca~(2+ ) ~( )Mg~(2+). The main reason for the strong capacity of cation exchange might be that the 1 nm manganate possesses a tunnel-like structure.