Investigations on SYNROC mineralogy. Progress report Page: 4 of 97
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This composition (Table 1) corresponds to RaAl^Ti^O^ (70 vtX) +
TiO^ (30 wt I!) + an additional 2% Cs^O. The excess of T10» is present
in order to maximise solid solution in the hollandlte towards the
hypothetical Ti-end-member "Ba A1 Tio0,£". . Similar solid solutions
occur in hollandite in STOROC, because of the high TiO^-activity of
the SYNROC phase assemblage.
3. Effect of hot-pressing temperature on leach-rate
The composition "Cs-holl.raix I" was dried in air at 800°C. An
additional 2X Ti retal was incorporated immediately prior to hot-
pressing, in order to facilitate redox control (this topic is discussed
further in Section 4 (b)). The samples were hot-pressed in Hi capsules
at temperatures ranging from 1 LOO to 1350°C. The leach-rates obtained
for these samples (Table 2) are illustrated in Fig.l. As in our earlier
studies (Ringwood et al., 1981b) the leach-rates aTe observed to decrease
markedly with time, falling by about an order of magnitude over seven
days. The individual samples themselves yield leach-rate curves dispersed
over about an order of magnitude (Fig.l). However it is apparent that
the highest leach-races occur in samples hot-pressed at temperatures of
1300°C or higher. The less-satisfactory leaching performance of these
latter samples is tentatively attributed to incipient partial melting at
near-solidus temperatures. Under such conditions some cesium may
partition into an intergranular melt phase, from which it Is then more
4. Effects of hot-pressing redox conditions on leach-rates
(a) Redox conditions controlled by sample capsule
The composition "Cs-holl.mix 1" (Table 1) was hot-pressed In Ki
capsules at 5 kbar and temperatures from 115I>0C to 127S°C. The same
starting material was then hot-presBed in graphite dies at 4000 pal and
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Ringwood, A.E. Investigations on SYNROC mineralogy. Progress report, report, January 21, 1982; [Livermore,] California. (https://digital.library.unt.edu/ark:/67531/metadc1091870/m1/4/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.