- Summary, What
should be known, French
version
-
- On this page :
Recipes and photos, Raw
materials analysis, substituted
recipes for hardwood ash (washed), QIT Red Dust
Substitution
-
-
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LEPIDOLITE ASH
GLAZES
by
Edouard Bastarache
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-
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C/8-10 R Lepidolite
Glossy Brown/Black Ash Glaze
(1012)
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|
|
|
|
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
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|
Bentonite
|
2
|
|
Cobalt
carbonate
|
2
|
|
|
|
C/8-10 Lepidolite
Glossy Dark Brown Ash Glaze
(1050)
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|
|
|
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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)
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|
|
|
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Lepidolite
|
22
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Nepheline
Syenite
|
10
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Ferro frit
#3134
|
10
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|
Hardwood Ash
(Washed)
|
17
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|
Ball Clay
|
7
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Silica
|
34
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|
Bentonite
|
2
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|
Zirconium
silicate
|
12
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|
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|
C/8-10 R
Lepidolite White Ash Glaze #2
(928)
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|
|
|
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Lepidolite
|
22
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Nepheline
Syenite
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10
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Ferro frit
#3134
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10
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Hardwood Ash
(Washed)
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17
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Ball Clay
|
7
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Silica
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34
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Bentonite
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3
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Zirconium
silicate
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14
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- C/8-10 R
Lepidolite White Ash Glaze #3
(952)
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Lepidolite
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22
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Nepheline
Syenite
|
10
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Ferro frit
#3134
|
10
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|
Hardwood Ash
(Washed)
|
17
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|
Ball Clay
|
7
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Silica
|
34
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|
Bentonite
|
3
|
|
Zirconium
silicate
|
16
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- C/8-10
Lepidolite Textured Light
Green Ash Glaze
(960)
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Lepidolite
|
25
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Dolomite
|
10
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Ferro frit
#3134
|
20
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Hardwood Ash
(Washed)
|
10
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|
Kaolin
|
10
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Silica
|
25
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Bentonite
|
2
|
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QIT Red
Dust
|
2
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- C/8-10
Lepidolite Dark Glossy Blue
Ash Glaze (961)
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|
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Lepidolite
|
25
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Sodium spar (Kona
F-4)
|
10
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Ferro frit
#3134
|
10
|
|
Dolomite
|
10
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|
Hardwood Ash
(Washed)
|
10
|
|
Kaolin
|
10
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Silica
|
25
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Bentonite
|
2
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Cobalt
carbonate
|
1
|
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- C/8-10 R
Lepidolite Dark Brown Ash
Glaze (977)
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|
|
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Lepidolite
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25
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Ferro frit
#3134
|
20
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Dolomite
|
10
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Hardwood Ash
(Washed)
|
10
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Kaolin
|
10
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Silica
|
25
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Bentonite
|
2
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QIT Red Dust
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4
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- C/8-10
Lepidolite Scintillating Dark
Blue Ash Glaze
(978)
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Lepidolite
|
25
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Sodium spar (Kona
F-4)
|
10
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Ferro frit
#3134
|
10
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Dolomite
|
10
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Hardwood Ash
(Washed)
|
10
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Kaolin
|
10
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Silica
|
25
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Bentonite
|
2
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Cobalt
carbonate
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1.5
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- C/8-10 R
Lepidolite Scintillating Light
Blue Ash Glaze
(989)
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Lepidolite
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22
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Nepheline
syenite
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10
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Ferro frit
#3134
|
10
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|
Hardwood Ash
(Washed)
|
17
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Ball clay
|
7
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Silica
|
34
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Bentonite
|
3
|
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Cobalt
carbonate
|
4
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|
Zirconium
silicate
|
16
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- Raw materials analysis
(Lepidolite, hardwood ash, QIT red dust, Ferro frit
3134 and Sodium spar) :
-
- From
Glenn C. Nelson’s Ceramics, a potter’s
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.
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- 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.
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Lepidolite
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Hardwood ash (Ash
Berhens)
|
QIT red dust
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%
poids
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Seger
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%
poids
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Seger
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%
poids
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SiO2
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55.00 %
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3.743
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27.73 %
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0.430
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5.00%
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TiO2
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-
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-
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0.37 %
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0.000
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-
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Al2O3
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25.00 %
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1.000
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7.46 %
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0.070
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-
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Fe2O3
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0.08 %
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0.000
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0.92 %
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0.010
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85.00%
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P2O5
|
-
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-
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4.10 %
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0.030
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-
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CaO
|
-
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-
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53.43 %
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0.890
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5.00%
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MgO
|
-
|
-
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3.04 %
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0.070
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1.00%
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ZnO
|
-
|
-
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-
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-
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2.00%
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K2O
|
9.00 %
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0.392
|
-
|
-
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-
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Na2O
|
1.00 %
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0.065
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-
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-
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-
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KNaO
|
-
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-
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2.95 %
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0.040
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-
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Li2O
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4.00 %
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0.543
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-
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-
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-
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F2
|
5
%
|
-
|
-
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-
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-
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Carbone
|
-
|
-
|
-
|
-
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2.00%
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Loss on ignition
|
- 0.92 %
- (+5% fluorine)
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-
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-
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-
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-
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molecular weight
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384 g
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-
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93.7 g
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-
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-
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- 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.
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- Substituted recipes
(for those who do not have Hardwood Ash (Washed), I
have calculated substitutions) :
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-
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- A-Original base
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- A1-Substituted base
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B-Original base
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- B1-Substituted base
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- C-Original base
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- C1-Substituted base
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|
Lepidolite
|
22
|
21
|
25
|
26
|
25
|
26
|
|
Nepheline Syenite
|
10
|
12
|
-
|
-
|
-
|
-
|
|
Ferro frit #3134
|
10
|
9
|
20
|
19
|
10
|
9
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Sodium spar (Kona F-4)
|
-
|
-
|
-
|
-
|
10
|
11
|
|
Hardwood ash (washed)
|
17
|
-
|
10
|
-
|
10
|
-
|
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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
|
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- N.B. Ball clay may be replaced by
Kaolin since it is difficult to get in some European
countries
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-
- 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
|
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