Cationic reaction of transition metals with synthetic crystalline calcium sillicates

ABSTRACT

The action uptake reactions of transition metals of Mn, Fe, Co, Ni, Cu, Zn, Pb, Cd and Hg with some synthetic crystalline calcium silicates such as xonotlite, gyrolite and Beta-wollastonite were studied. The total cations uptake reaction appeared to be a factor combining both partial exchange Ca[2+] - M[2+]and precipitation of M[2+] as carbonates, hydroxy carbonates, hydroxy nitrates or hydroxides during the course of reaction. It was difficult to delineate the extent of the former reaction from the latter. These cations; have negative effect, on basic crystallinity of the solids, Beta-wollastonite was considered the most stable one. The total amounts in meq. of ions up taken by these solids have been found in a descending order xonotlite > gyrolite > Beta-wollastonite