- Summary-------------------French
version
-
- On this page :
Recipes and photos, Raw materials analysis,
substituted recipes for hardwood ash (washed), QIT Red
Dust Substitution
-
-
-
LEPIDOLITE
ASH GLAZES
by
Edouard Bastarache
|
-
-
|
C/8-10
R Lepidolite Glossy Brown/Black Ash
Glaze (1012)
|
|
|
Lepidolite
|
25
|
Dolomite
|
10
|
Ferro frit
#3134
|
20
|
Hardwood
Ash (Washed)
|
10
|
Kaolin
|
10
|
Silica
|
25
|
Bentonite
|
2
|
QIT Red
Dust
|
6
|
|
|
C/8-10
R Lepidolite Scintillating Glossy
Dark Blue Ash Glaze
(1013)
|
|
|
Lepidolite
|
25
|
Sodium
spar (Kona F-4)
|
10
|
Dolomite
|
10
|
Ferro
frit #3134
|
10
|
Hardwood
Ash (Washed)
|
10
|
Kaolin
|
10
|
Silica
|
25
|
Bentonite
|
2
|
Cobalt
carbonate
|
2
|
|
|
C/8-10
Lepidolite Glossy Dark Brown Ash
Glaze (1050)
|
|
|
Lepidolite
|
25
|
Dolomite
|
10
|
Ferro
frit #3134
|
20
|
Hardwood
Ash (Washed)
|
10
|
Kaolin
|
10
|
Silica
|
25
|
Bentonite
|
2
|
QIT Red
Dust
|
8
|
|
|
C/8-10
R Lepidolite Scintillating Glossy
Dark Blue Ash Glaze
(1051)
|
|
|
Lepidolite
|
25
|
Sodium
spar (Kona F-4)
|
10
|
Dolomite
|
10
|
Ferro
frit #3134
|
10
|
Hardwood
Ash (Washed)
|
10
|
Kaolin
|
10
|
Silica
|
25
|
Bentonite
|
2
|
Cobalt
carbonate
|
2.5
|
|
|
C/8-10
R Lepidolite White Ash Glaze #1
(910)
|
|
|
Lepidolite
|
22
|
Nepheline
Syenite
|
10
|
Ferro
frit #3134
|
10
|
Hardwood
Ash (Washed)
|
17
|
Ball
Clay
|
7
|
Silica
|
34
|
Bentonite
|
2
|
Zirconium
silicate
|
12
|
|
|
C/8-10
R Lepidolite White Ash Glaze #2
(928)
|
|
|
Lepidolite
|
22
|
Nepheline
Syenite
|
10
|
Ferro
frit #3134
|
10
|
Hardwood
Ash (Washed)
|
17
|
Ball
Clay
|
7
|
Silica
|
34
|
Bentonite
|
3
|
Zirconium
silicate
|
14
|
|
|
- C/8-10
R Lepidolite White Ash Glaze
#3
(952)
|
|
|
Lepidolite
|
22
|
Nepheline
Syenite
|
10
|
Ferro
frit #3134
|
10
|
Hardwood
Ash (Washed)
|
17
|
Ball
Clay
|
7
|
Silica
|
34
|
Bentonite
|
3
|
Zirconium
silicate
|
16
|
|
|
- C/8-10
Lepidolite Textured Light
Green Ash Glaze
(960)
|
|
|
Lepidolite
|
25
|
Dolomite
|
10
|
Ferro
frit #3134
|
20
|
Hardwood
Ash (Washed)
|
10
|
Kaolin
|
10
|
Silica
|
25
|
Bentonite
|
2
|
QIT Red
Dust
|
2
|
|
|
- C/8-10
Lepidolite Dark Glossy Blue
Ash Glaze
(961)
|
|
|
Lepidolite
|
25
|
Sodium
spar (Kona F-4)
|
10
|
Ferro
frit #3134
|
10
|
Dolomite
|
10
|
Hardwood
Ash (Washed)
|
10
|
Kaolin
|
10
|
Silica
|
25
|
Bentonite
|
2
|
Cobalt
carbonate
|
1
|
|
|
- C/8-10
R Lepidolite Dark Brown Ash
Glaze
(977)
|
|
|
Lepidolite
|
25
|
Ferro
frit #3134
|
20
|
Dolomite
|
10
|
Hardwood
Ash (Washed)
|
10
|
Kaolin
|
10
|
Silica
|
25
|
Bentonite
|
2
|
QIT Red
Dust
|
4
|
|
|
- C/8-10
Lepidolite Scintillating Dark
Blue Ash Glaze
(978)
|
|
|
Lepidolite
|
25
|
Sodium
spar (Kona F-4)
|
10
|
Ferro
frit #3134
|
10
|
Dolomite
|
10
|
Hardwood
Ash (Washed)
|
10
|
Kaolin
|
10
|
Silica
|
25
|
Bentonite
|
2
|
Cobalt
carbonate
|
1.5
|
|
|
- C/8-10
R Lepidolite Scintillating
Light Blue Ash Glaze
(989)
|
|
|
Lepidolite
|
22
|
Nepheline
syenite
|
10
|
Ferro
frit #3134
|
10
|
Hardwood
Ash (Washed)
|
17
|
Ball
clay
|
7
|
Silica
|
34
|
Bentonite
|
3
|
Cobalt
carbonate
|
4
|
Zirconium
silicate
|
16
|
|
-
-
- Raw materials analysis
(Lepidolite, hardwood ash, QIT red dust, Ferro frit
3134 and Sodium spar) :
-
- From Glenn C. Nelsons
Ceramics, a potters handbook, page 322 of
the fifth edition, we have obtained the following
chemical analysis of Lepidolite. Fluorine is volatile
and may cause blisters at high temperatures (Robin
Hopper in The Ceramic Spectrum,1984, page 52).
- Using the method described
in Daniel Rhodes, revised edition of Clay and
glazes for the potter at chapter 13 Glaze
calculation using materials containing more than one
oxide under the heading Feldspar
formula we have defined the following
formula for Lepidolite since it is a feldspathoid
considered here in its fired or calcined state.
-
- QIT stands for Quebec Iron
& Titanium (Québec Fer & Titane). QIT
owns an ilmenite mine in northeastern Quebec. The ore
is shipped to Tracy where it is processed to titanium
dioxide slag, iron pigs, steel billets and steel
autoparts. This dust comes from the dust collecting
system of the steelmelting department . See the
general formula below. It was 170 mesh
sieved.
-
-
-
|
Lepidolite
|
Hardwood ash
(Ash Berhens)
|
QIT red
dust
|
%
poids
|
Seger
|
%
poids
|
Seger
|
%
poids
|
SiO2
|
55.00
%
|
3.743
|
27.73
%
|
0.430
|
5.00%
|
TiO2
|
-
|
-
|
0.37
%
|
0.000
|
-
|
Al2O3
|
25.00
%
|
1.000
|
7.46
%
|
0.070
|
-
|
Fe2O3
|
0.08
%
|
0.000
|
0.92
%
|
0.010
|
85.00%
|
P2O5
|
-
|
-
|
4.10
%
|
0.030
|
-
|
CaO
|
-
|
-
|
53.43
%
|
0.890
|
5.00%
|
MgO
|
-
|
-
|
3.04
%
|
0.070
|
1.00%
|
ZnO
|
-
|
-
|
-
|
-
|
2.00%
|
K2O
|
9.00
%
|
0.392
|
-
|
-
|
-
|
Na2O
|
1.00
%
|
0.065
|
-
|
-
|
-
|
KNaO
|
-
|
-
|
2.95
%
|
0.040
|
-
|
Li2O
|
4.00
%
|
0.543
|
-
|
-
|
-
|
F2
|
5
%
|
-
|
-
|
-
|
-
|
Carbone
|
-
|
-
|
-
|
-
|
2.00%
|
Loss on
ignition
|
- 0.92
%
- (+5%
fluorine)
|
-
|
-
|
-
|
-
|
molecular
weight
|
384
g
|
-
|
93.7
g
|
-
|
-
|
-
- Ferro
frit 3134 : Na2O 0,317 CaO 0,683 B2O3 0,634 SiO2
1,476
- Kona
F4 Feldspar : Commonly used soda feldspar; used in
porcelains because of its low iron content.
Composition % 6.90 Na2O 4.8 K2O 0.05 MgO 1.70 CaO
19.60 Al2O3 66.80 SiO2 0.04 Fe2O3 0.20 loss on
ignition.
-
-
- Substituted recipes
(for those who do not have Hardwood Ash (Washed), I
have calculated substitutions) :
-
-
-
|
- A-Original
base
|
- A1-Substituted
base
|
B-Original
base
|
- B1-Substituted
base
|
- C-Original
base
|
- C1-Substituted
base
|
Lepidolite
|
22
|
21
|
25
|
26
|
25
|
26
|
Nepheline
Syenite
|
10
|
12
|
-
|
-
|
-
|
-
|
Ferro
frit #3134
|
10
|
9
|
20
|
19
|
10
|
9
|
Sodium
spar (Kona F-4)
|
-
|
-
|
-
|
-
|
10
|
11
|
Hardwood
ash (washed)
|
17
|
-
|
10
|
-
|
10
|
-
|
Ball
clay
|
7
|
8
|
-
|
-
|
-
|
-
|
Kaolin
|
-
|
-
|
10
|
10
|
10
|
10
|
Silica
|
34
|
34
|
25
|
25
|
25
|
25
|
Calcium
carbonate
|
-
|
12
|
-
|
8
|
-
|
8
|
Bone
ash
|
-
|
2
|
-
|
1
|
-
|
1
|
Dolomite
|
-
|
2
|
10
|
11
|
10
|
10
|
-
- N.B.
Ball clay may be replaced by Kaolin since it is
difficult to get in some European
countries
-
- QIT
Red Dust subtitution :
-
- A
theoritical substitution is as follows for each 1% of
the stuff :
-
-
Red
Iron Oxide
|
0.820
|
Silica
|
0.050
|
Calcium
carbonate
|
0.060
|
Dolomite
|
0.050
|
Zinc
oxide
|
0.020
|
Total
|
1.000
|
-
-
-
-
|
|
- Edouard
Bastarache M.D.
- (Occupational
& Environmental
Medicine)
-
- Author
of " Substitutions for raw ceramic
materials "
- Tracy,
Québec, CANADA
- edouardb@colba.net
|
-
-
-
- Smart2000.fr
©
Avril 2005
-
FRANCE
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