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reaction yield. It must,
however, be
remember-ed that great cail ti ön
must be exercised, when
drawing such
conclu-sions concerning
systems of this kind.
C. Kaolin VG (Table 1,
Fig. 5).
In experiments with
this substance only a
mixture of 2 CaO
-j-+ 1. [A1203. Si02] was
examined. The results
are generally similar to
those obtained with the
kaolin VA. The
reacti-vity of the VG
preparations is, however,
con-siderably smaller, the
amounts of reacted CaO
at temperatures below
800° being about half
of those observed witli
kaolin VA and about
twice those obtained
with pholerite.
The relative positions
of the yield curves
eor-responding to
preparations preheated at or
below 800° are also
similar, a fact that
supports our hypothesis
concerning the influence
of aging processes ön
the reactivity of
meta-kaolin and the röle
played by the
gas-form-ing impurities at higher
reaction temperatures.
The maximum is
evident ön the curves for
VGiooo’111- and VG 1000/5h.
In agreement with the
general difference in
reactivity between the
Pho, VA and VG
preparations, the maximum
is not so pronounced as
ön the corresponding
VA curves but
some-what möre marked than
ön the pholerite curves.
The smaller reactivity
of kaolin VG in
com-parison with kaolin VA
remains even at the
highest reaction
temperatures. Only at
1150° the CaO
con-sumption almost reaches
100 p. c. (as is also the case with pholerite), while
the VA preparations react completely with CaO about
50° lower.
Kemi
CaO reacted in mol-per t[,4l203-2Si02J
2,0
Fig. 6 A och B.
D. Kaolin VL (Table 1, 2 and 3, Fig. 6 A, B).
Both qualitatively and quantitatively this kaolin
shows almost the same chemical behaviour as phole-
8 febr. 1941
19
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