In the papers previously published by several other authors
5), 7), the average specific resistance ofcakeatconstant pressure filtration,
αf, was represented as a function of a single variable, that is, the filtration pressure
p0. According to the results of our constant-pressure-filtration experiments with the so-called ceramic slurries, the ignition-plug slurry was the only case where
αf was a function of a single variable
p0, and
αf of all other slurries was not so simple. In this paper we report the various filtration characteristics of Gairome-Clay slurries.
Summaries of the results were as follows:
i) ε vs.
ps data obtained from the compression measurements by using a consolidometer are plott- ed in Fig. 1. (ε) was a function of
ps only, and was not influenced by the slurry concentrations. (
k·S02)vs. ε data from permeability measurements are plotted semilogarithmically in Fig. 2, resulting in approximate empirical equations (2). m-values predicted by equation (3) were found to be a function of
p0 only, as shown in Fig. 3, and
αapp-values predicted by equation (4) to be a function of s as well as of
p0.
ii) (
Δθ/ΔV)vs.
V relation at constant-pressure filtration with Gairome-Clay slurry, indicated a curve, which approached asymptotically to a straight line as V increased.
iii) The relation of (
K·S20)app
·s vs. s, of each constant-pressure filtration, showed also a curve.
iv) Applying the predicted m-values to the constant-pressure filtration results, the following empirical equations of α
f were obtained.
where
aad (dimensionless)
Therefore, the average specific resistance,
αf, of the Gairome-Clay cake at constant pressure filt- ration could be represented as the sum of the term (
αapp) -including variables
p0 and s only-, and the correction term (
αcorr) -including variables
p0,
s and
V.
The term (
αcorr) in the empirical equation of
αf indicates the influence of degree of particle flocculation, depending on the slurry concentrations; while the term (
αapp) in the expression of
αf shows the occurrence of cake disflocculation due to the filtrate flow, in other words, the existence of a kind of scouring effect.
抄録全体を表示