Abstract
The preliminary results of melt rate modeling based on thermodynamic equilibrium are presented. The underlying premise used is that melt rate would increase as the total free energy of formation of the final melt becomes more negative or as the rate of calcine gas generation decreases was proved to be valid in 8 test cases with varying frit, sludge washing, redox and acid addition feeds. A semi-empirical melt rate indicator was derived from the output of the existing 4-stage cold cap model and the resulting predictions also compared favorably against measured melt rates both normalized to the same baseline. In particular, predicted melt rate trends under varying waste loading and sodium partitioning between frit and sludge showed an excellent agreement with the measured profiles, which suggests that the modeling approach taken in this work has a potential for yielding a viable tool for the frit development and selection process while lessening the dependency on the experimental program.
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