Kaolin & Kaolinitic Clay Deposits
Kaolin is the rock mass, which is composed of a clay mineral that has the following main properties:
1- Low in iron content.
2- white or nearly white in color.
3- kaolin forming clays are hydrous aluminum silicates (2H2O-Al2O3-2SiO2).
4- chemically inert over a relatively wide pH Range.
5- Soft and non-abrasive.
6- Low thermal or electrical conductivity.
Average chemical analysis of Kaolin (wt%)
|
SiO2 |
Al2O3 |
TiO2 |
FeO |
MgO |
Fe2O3 |
CaO |
Na2O |
K2O |
L.O.I |
Sio2/Al2o3 |
|
45.65 |
37.37 |
0.79 |
0.08 |
0.34 |
o.68 |
0.47 |
0.19 |
0.63 |
13.91 |
1.22 |
Occurrences
Kaolin is present in different localities as the following:
I-West Central Sinai:
Main Locations: between longs. 31o- 34 o , lats. 28 o - 30 o
<!--Farsh EL Ghazlan
<!--Musaaba Salama
<!--Taiyba
<!--Nagb Budra
<!--Wadi Abu Natash
<!--EL-Dehessa
<!--Wadi Kabrit
<!--Dereib Agrab
<!--EL-Tieh
<!--Abu Regim
<!--EL-Shallal
<!--Umm Alagan
<!--Gabal Hazbar
<!--EL-khaboba
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<!--Abu Djeimat
1-Farsh EL Ghazlan
LOCATION: 20 KM SOUTH ABU ZENIMA
RESERVES: proved probable possible total
109.400 --------- -------- 109.400
XRD analysis:
Kaolinite Quartz Accessory minerals
58% 30% 12%
Chemical analysis (wt%)
|
Al2O3 |
SiO2 |
Fe2O3 |
MgO |
CaO |
TiO2 |
Na2O |
K2O |
L.O.I |
SO3 |
Cl |
|
30.83 |
54.28 |
o.96 |
0.31 |
1.84 |
1.45 |
1.15 |
O.54 |
9.1 |
0.34 |
o.88 |
Plastic properties:
Plasticity: 22.6 - 23.9 Coefficient: 26.6
Drying properties:
drying shrinkage:Linear: 2.25-3%
Firing properties:
Firing shrinkage: Linear: 5% at 1500 c
Fusion temperature >or= 1730 c
Firing color: dark creamy
Virtification rang: 1250>=1500c
Total contraction at 1500c: 7.25 % and after cooling: 5%
Whiteness of raw kaolin : 64.36
Whiteness of fired at 1400c : 62.1
Bulk density (g/cm3): 2.07
Water absorption % at 1500c : 9.87
2- Musaaba Salama
LOCATION: Eastward of ABU ZENIMA
RESERVES: proved probable possible total
207.ooo 239.500 -------- 442.500
XRD analysis:
Kaolinite Quartz Accessory minerals
77% 5% 18%
Chemical analysis (wt%)
|
Al2O3 |
SiO2 |
Fe2O3 |
MgO |
CaO |
TiO2 |
Na2O |
K2O |
L.O.I |
SO3 |
Cl |
|
37.43 |
44.52 |
0.63 |
0.41 |
0.56 |
2.64 |
0.91 |
0.27 |
14.31 |
0.61 |
0.07 |
Plastic properties:
Plasticity: Coefficient: 23.7
Drying properties:
drying shrinkage:Linear: 3.5%
Firing properties:
Firing shrinkage: Linear: 11.7% at 1500 c
Fusion temperature (equivalent) > 1730 c
Firing color: creamy
Virtification range: 1250>=1500c
Total contraction at 1500c: 17.25 % and after cooling:11.7%
Whiteness of raw kaolin : 66.98 %
Whiteness of fired at 1400c : 64.32
Bulk density (g/cm3): 2.52
Water absorption % at 1500c : 3.23
3-Taiyba
LOCATION:
RESERVES: proved probable possible total
----- ------- ------ ---
XRD analysis:
Kaolinite Quartz Accessory minerals
Main minerals some some
emical analysis (wt%)
|
Al2O3+TiO2 |
SiO2 |
Fe2O3 |
MgO |
CaO |
Na2O |
K2O |
L.O.I |
|
17.45-34.41 |
69.12-46.11 |
3.36-1.57 |
0.43-0.10 |
0.30-0.20 |
0.14-0.12 |
0.68-0.30 |
16.65-8.09 |
Plastic properties:
Plasticity: 30.3
Drying properties:
drying shrinkage:Linear: 1.8-6.6 %
Firing properties:
Firing shrinkage: Linear: 14.1 % at 1400c
Fusion temperature : Firing color: No defective colors
Virtification range:
Whiteness of raw kaolin :
Whiteness of fired at 1400c : Bulk density (g/cm3):
Water absorption % at 1400c : 18.6
4-Nagb Burda
LOCATION: 26 km south east of Abu Zenima
RESERVES: proved probable possible total
34.500 69.100 81.600 185.000
XRD analysis:
Kaolinite Quartz Accessory minerals
pure traces ------
Chemical analysis (wt%)
|
Al2O3+TiO2 |
SiO2 |
Fe2O3 |
MgO |
CaO |
Na2O |
K2O |
L.O.I |
|
40.4 |
44.8 |
0.29 |
0.00 |
0.60 |
0.10 |
N.D. |
13.80 |
Plastic properties:
Plasticity: 25.3
Drying properties:
drying shrinkage:Linear: 2.3 to 6.7 %
Firing properties:
Firing shrinkage: Linear: 16.1 % at 1300c
Fusion temperature : Firing color: slight grey shade
Sintering at more than 1400c
Whiteness of raw kaolin :
Whiteness of fired at 1400c : Bulk density (g/cm3):
Water absorption % at 1300c : 7.1
5-Abu Natash
LOCATION:
RESERVES: proved probable possible total
----- ------- ------ ---
XRD analysis:
Kaolinite Quartz Accessory minerals
pure traces ---
Chemical analysis (wt%)
|
Al2O3+TiO2 |
SiO2 |
Fe2O3 |
TiO2 |
CaO |
Na2O |
K2O |
L.O.I |
|
39.42-41.37 |
42.24-43.60 |
0.72-1.79 |
0.25-2.65 |
N.D. |
N.D. |
N.D. |
13.51-14.04 |
Plastic properties:
Plasticity: 22.9
Drying properties:
drying shrinkage:Linear: 2.3-6.7 %
Firing properties:
Firing shrinkage: Linear: 12.8-14.3 % at 1400c
Fusion temperature : Firing color: No defective colors
Sintering at more than 1400c
Whiteness of raw kaolin:
Whiteness of fired at 1400 c : Bulk density (g/cm3):2.54
Water absorption % at 1400 c: 4.4-7.1
6-EL- Dehessa
LOCATION: South Abu Zenima
RESERVES: proved probable possible total
&nb
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