Glass-ceramic composition to immobilize ICPP HLW

摘要

Candidate glass-ceramic waste forms have been prepared by Hot Isostatic Pressing (HIPing) simulated calcined Idaho Chemical Processing Plant (ICPP) high-level waste (HLW) and glass-ceramic forming additives which include SiO(sub 2),B(sub 2)O(sub 3),Na(sub 2)O, and Li(sub 2)O. Titanium dioxide is added to enhance titanate phase formation to host cadmium, and Ni or Ti powder is added as a reducing agent. Durable products with waste loading up to 75 wt% and product densities up to 3.3 g/cm(sup 3) have been formed. The glass-ceramic waste form has the potential to reduce final waste volume by up to 60% compared to glass. Preliminary leach rates of the products determined using the 14 and 28 day MCC-1 leach tests are less than 1 g/m(sup 2)-day and are comparable with HLW glass products for the glass matrix elements of Si, B Li, and Na and for the waste components of Cd, Cr, Ca, and Al.