Kaolin clay excavation
Clay mine
Kaolin clay excavation
Kaolin Clay
CONCLUSION
Based on test results, the conclusion is that this is a clay that sinters relatively low.
In the area of water absorption of 10%, obtained on 1000-1050°C, shows no shrinking, and the interesting fact is that also in area of 1150-1200°C, when the water absorption is almost 0, the shrinking value stays almost the same.
The mineral structure shows presence of kaolinite, ILIT and montmorionite as well, which is a rare case in our country - considering the clays known so far to be dominantly ilitic.
Due to the mineral structure, the percentage of Al2O3 is relatively high, which affect the fireproof ability of this clay. Based on these features, this clay can perform in ceramic masses as a component that reduces the sensitivity during the baking process and stabilizes the ceramic mass during the technologic production.
Considering the color of baking, it can be used in a higher percentage
for product that have whit color of baking.
|
|
QUALITY CHARACTERISTICS
Structure according to petrographic mineralogy
Minerals |
Weight in % |
kaolinite |
34 |
ilit |
20 |
montmorionite |
10 |
quartz |
25-30 |
feldspaths |
5 |
Compared to other ceramic clay mines, this one has extraordinary favorable mineral structure, which includes three clay minerals.
The color of the clay is bright gray; humidity is 15,2%
Fireproof capability SK - 29 - 1955°C.
Chemical structure
G.Z. |
SiO2 |
Al2O3 |
TiO2 |
Fe2O3 |
Cao |
MgO |
K2O |
Na2O |
6,45 |
61,20 |
25,92 |
1,66 |
0,92 |
1,12 |
0,60 |
2,25 |
0,07 |
Granulation structure
Size of particles in µm |
weight in % |
-60+40 |
4.1 |
-40+30 |
1.4 |
-30+20 |
3.1 |
-20+16 |
2.3 |
-16+12 |
4.7 |
-12+10 |
6.0 |
-10+8 |
11.7 |
-8+6 |
1.3 |
-6+3 |
2.9 |
-3+2 |
4.8 |
-2 |
57.7 |
Residue on the sieve per 10000 oc/cm²=10.4%
Features and reaction of the clay during
the process of drying and baking
Water required for plastic processing |
Plastic features "Pfeffer" ORN-u |
Resistance to breaking in raw condition |
23.4% |
31.1g H2O/100g |
na 40°C
23,6 Kp/cm² |
Baking, sample prepared with application
of plastic processing
Temperature
1°C SK |
Color of baking
marked acc. to S.E.S. |
Shrinkinge
in % |
Water
absorption in % |
Appearance and condition of the sample |
1000 |
D-3 |
9.8 |
16.6 |
|
1050 |
D-2 |
10.0 |
13.1 |
|
1100 |
D-2 |
10.2 |
10.7 |
|
1150 |
C-5 |
10.4 |
4.2 |
|
1200 |
A-5 |
12.4 |
0.9 |
|
Chart of sintering
|
