KAOLIN CLAY

 

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Kaolin clay excavation

 

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Clay mine

 

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Kaolin clay excavation

 

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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

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