Calculation of Suspension Peptization Page: 40
134 p. : graphs, tables ; 28 cm.View a full description of this report.
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Effects of Electrolyte Valence and Concentration. Figures 6 and 7 give
the calculated effects of electrolyte valence and concentration for two dif-
ferent particle sizes. The accuracy of the calculation appears to suffer at
the higher valence and concentration due to the small value of HM. This is
especially true at the smaller particle radius. Some of the points for a
valence of 1 and a particle radius of 200 A are less accurate because of low
values of xa and a large value of VN/kT. The curves indicate that with a
valence of 1 the electrolyte concentration has a relatively small effect;
but with a valence of two, increasing the electrolyte concentration necessi-
tates considerably higher surface potential. At the lowest electrolyte con-
centration there is little difference between valences of 1 and 2.
Effect of Suspension Concentration. The two cases shown in Fig. 8
indicate that increasing the suspension concentration tends to require
an increase in the surface potential. However, this effect is small rela-
tive to the effect of some of the other variables.
Effect of the Flocculation Period. Figure 9 shows the interaction of
surface potential and flocculation time. The curve indicates that only a
small increase in surface potential is required to give a large increase
in the flocculation period.
5.0 APPLICATION TO Th02 SUSPENSION TECHNOLOGY
The direct usefulness of the foregoing calculations is limited because
only hypothetical values of surface potential are included. A real ThO2
suspension can be expected to have an equilibrium surface potential that
is determined by other parameters and that cannot be controlled directly.
Experimental work aimed at determining the surface potential of Th02
under conditions of interest should serve to tie the present calculations
to real suspensions. Experimental variables that are probably of interest
are temperature, electrolyte valence, electrolyte concentration, and pH of
the suspending medium. The potential is probably essentially independent
of particle radius and suspension concentration.
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Sweeton, F. H. Calculation of Suspension Peptization, report, 1960; Oak Ridge, Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc100288/m1/42/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.