15 (Teknisk Tidskrift / 1941. Kemi)

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Tab. 1. Reaction temperatures and reacted CaO in per cent by weight of entire C aO-quantity.

o
w

Ca0 2 Mo lar ra ti o = • Thermal treatment
Al203.2Si02 1 of kaolin before 300 350 400 450 500 550 600 . 650 700 750 800 850 900 950 1000 1050 1100 1150 1200
Mixtures reaction (preheating]
CaO + Pholerite 600° 1 h. 2,5 2,7 3,4 2,8 3,0 5,7 12,3 32,0 70,5 88,8
5 „ — — 3,7 — 2,5 — 3,8 — 4,7 - — 5,5 — 13,0 — (31,o) — 77,0 85,2 _
800° 1 „ — — 1,7 — 2,1 — 2,4 — 3,4 — 3,8 .—. 13,5 — 35,9 — 84,1 95,6 —
5 „ — — 2,1 __ 3,1 — 4,0 — 4,5 — 4,0 — 8,2 — 36,7 — 75,8 90,o _
1 000° 1 „ — — 3,0 — 5,0 — 7,1 — 3,9 — 4,5 — 13,5 — 38,4 — 74,7 92,2 _
5 „ — — 3,3 — 3,4 — 2,7 — 3,9 — — — — — 47,3 — 86,2 95,3 —
1200" 1 „ — — 3,1 —- 3,2 — 4,4 — 4,2 — 4,1 — 8,5 — 43,2 — 89,0 98,5 —
CaO + Kaolin VA 600° 1 h. — — — — 11,3 12,0 13,5 16,0 16,0 _ 19,9 24,0 34,9 52,2 71,4 85,7 93,1 ___ 98,8
5 „ — — — — 13,9 — ■— 14,4 — — 18,1 25,0 38,9 57,5 76,1 — — — 97,0
800° 1 „ — — — — 14,7 — — 14,9 — — 17,1 27,8 46,2 67,3 85,6 — 97,0 —
5 „ — — — — 10,1 10,4 11,0 — 12,2 — 14,5 26’,o 49,4 72,7 88,2 — — 98,9 _
1 000° 1 „ 1,6- 4,5 15,2 24,5 26,6 - 24,0 — 18,0 .— 17,2 21,4 49,2 75,4 92,2 100,o — —
5 „ — 2,4 8,2 15,9 18,5 - 17,1 — 15,9 •— 15,6 25,0 47,2 — 86,1 — 100,o — —
1 200° 1 „ — — — — 8,7 - — — 9,0 — 11,8 — 48,1 — 83,7 — 100,o — —
CaO + Kaolin VG 600° 1 h. — — _ — 10,6 10,6 12,6 _ 14,4 16,5 21,1 28,0 37,2 54,7 70,9 _ 92,4 _ _
5 „ — — — — 6,1 6,2 7,7 — 7,8 9,5 16,6 26,5 39,9 60,3 77,6 95,7 100,’0 — —
800° 1 „ — — — — 4,0 5,7 9,2 — 9,7 10,5 12,5 21,9 42,3 62,5 79,8 95,0 98,8 — —
5 „ — — — -— 3,9 5,7 7,0 — 7,0 7,5 9,3 18,6 39,9 62,4 84,4 99,2 100,o —
900° 1 „ — — 6,8 9,6 8,3 7,1 6,5
1 000° 1 „ — — 7,8 10,3 7,8 6,0 5,9 — 6,6 6,7 6,9 14,3 32,0 51,2 71,4 84,1 92,8 — —
5 „ — — 4,5 6,2 5,1 — 4,2 — 4,8 — 5,4 10,8 30,1 — 72,6 — 93,8 — —
CaO + Kaolin VL 600° 1 li. _ _ _ 3,3 _ 5,0 _ 8,6 _ 15,1 _ 24,5 ._ 52,9 _ 80,3 94,5 _
5 „ — — 2,2 — 3,4 — 4,3 — 4,2 — 9,2 — 17,6 — 51,2 — 81,7 90,1 —
800° 1 „ — — 3,2 — 6,0 — 6,2 — 7,3 — 8,4 — 19,9 —• 47,;o — 77,5 91,8 —
5 „ _ — 3,4 — 3,7 — 4,8 — 6,7 — 8,7 — 20,4 — 42,2 — 70,4 85,2 —
1 000° 1 „ — — 6,0 — 5,7 — 4,5 — 6,3 — 7,4 — 17,8 — 37,9 — 75,0 87,7 —-
5 „ — — 6,7 •— 6,2 — 6,8 _ 6,4 •— 9,8 — 22,9 — 40,1 — 70,6 87,0 —
1 200° 1 „ — — — — 6,0 — 7,2 — 7,8 — 7,4 — 26,2 55,5 — 89,0 97,3 —

ff
3

Oi

stable in mixtures containing
möre than 1 CaO per A1„03.
. 2 Si02. Thus other reactions
influenced by the proportions
of the components may take
place. This is seen from the
ana-lytical values in table 3, which
elearly show that the
prolonga-tion of the reaction time from

1 to 6 hours results in a
con-siderable increase of the yields
in mixtures both with 2 aiid 5
molecules CaO per 1A1203.
. 2 Si02 even at high
temperatures (1000°). It is evident
that CaO will be completely
consumed at temperatures
where the reactions hàve
attained high velocity, and it
appears from table 1 that this
is the case at about 1150°
under the conditions prevalent
in these experiments. This cail
also be seen from the curves in
fig. 3 A, which show a
practi-cally complete consumption of

2 CaO per 1 A1203. 2 Si02
between 1000 and 1200°.

The products formed at the
highest temperatures in
mixtures containing 2 CaO
pro-bably are a mixture of
anorthite, gehlenite, CaO • A1203
and CaO • Si02. Möre basic
simple or complex aluminates
and silicates may be expected
as end products if the
mole-cular proportion between CaO
and A1203. 2 Si02 is raised to
5:1, as is the case in the
experiments the results of which
appear in table 2 and fig. 3 B.
lf the values of this table are
compared with those in table 1
it is seen that there is a
ten-dency to form möre basic
com-pounds. This is apparently
also the case at lower
temperatures, the amount of
reacted CaO in p.c. of the whole
quantity being almost the same
as in table 1, although the total
quantity of CaO in the
mixtures is möre than doubled. At
higher temperatures a tendency
to consume the wliole amount
of CaO is evident. Table 3
shows that even in the mixtures
with larger proportion of CaO
the reaction yield increases
considerably if the heating
time is prolonged from 1 to
6 hours. The influence of
topochemical factors, varying
indi-vidually with the substances
and their treatment, is evident,

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