Active Zinc Oxide
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China Clay
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ABOUT THE PRODUCT
China Clay, which falls under the Kaolinite group of clays is formed by weathering or hydrothermal alteration of felspathic rocks. It has the general formula Al 2 ,(Si 2 O 5 )(OH) 4 . It is a hydrated alumino-silicate having sheet structure. Free Silica (grit) is the most undesirable impurity and is removed during processing by levigation, sedimentation or air-separation.
 
DEPOSITS
High grade china clay deposits are present in West Bengal, Orissa, Rajasthan, M.P. & Gujarat. First we collect the samples from various mines which is analysed for composition and physical and chemical properties and its suitability for various applications is then studied. Moreover, sustained availability of the material with no variation from mines is given utmost importance to ensure consistency in final product.
 
PROCESSING
The raw china clay is subject to a refining process including spiral classification, hydrocycloning, deflocculation, bleaching and finally drying, micronizing, air-classification and surface treatment. Our processing ensures consistent composition, control of top-cut and average particle size and freedom from free silica.
 
Our quality assurance system extends from mining to micronizing to ensure near-Zero-defect products :-
 
  MINING
Manual sorting to recover white lumps.
On site chemical analysis before despatch to our factories.
  MICRONIZING
Test for physical properties like Bulk density, Oil absorption, Whiteness etc.
Particle - size distribution analysis.
  SURFACE TREATMENT
Testing of hydrophobicity, oil absorption and uniformity of coating.
  QUALITY TEST CERTIFICATION
Quality Test Certificate is provided to customers, certifying values within specifications.
  SERVICES
Just-in-time inventory management support by despatch from ready stock.
Before sales technical feedback and problem solving in collaboration with the customer by our technical service engineers.
Application development at customer's end supported by the central R&D laboratory of MLA Group.
After sales services & trouble-shooting by the sales & service engineers.
 
Tulsi Brand
TYPICAL PHYSIOCHEMICAL PROPERTIES OF LEVIGATED CHINA CLAYS
(Tulsi Brand)
   
GRADES

Property

Unit

TULSI-052

TULSI-053

MICRO-
5-SW

MICRO-
2-FW

MICRO-
2-LW

MICRO-
4-FW

Whiteness

%

92-96

93-96

90-94

88-90

86-90

86-90

Average Particle Size

microns

5-6

4-5

6-8

1.5-3.5

1.2-3.2

1.5-3.5

Surface Area

sq.m/cc

8-10

9-11

6-10

10-14

12-18

10-14

Sp. Gravity

-

2.7-2.8

2.7-2.8

2.7-2.8

2.5-2.6

2.3-2.4

2.5-2.6

Bulk Density*

gm/cc

0.38-0.45

0.36-0.44

0.40-0.48

0.32-0.35

0.28-0.32

0.34-0.38

Water Absorption

%

38-44

38-46

34-42

42-48

48-55

40-46

pH Value

 -

5.5-6.5

5.5-6.5

6.0-7.5

7.5-9.0

7.5-9.0

4.0-5.0

Moisture

% max

0.4

0.4

0.4

1.5

2.0

1.5

SiO2

 %

55-58

53-55

56-58

46-52

50-56

46-52

Al2 O2

 %

33-35

35-37

32-33

38-42

32-35

38-42

Fe2 O3

 %

<0.1

<0.1

<0.2

0.05-0.03

0.05-0.03

0.05-0.03

Mixed Oxides

% max

2.5

2.5

2.5

2.8

2.8

2.8

TiO2

 %

Traces

Traces

Traces

Nil

Nil

Nil

Loss on Ignition

%

<6.5

<6.5

<6.5

13-15

13-15

13-15

Residue
on 500 mesh

%

<1.0

<0.5

<2.0

<0.5

<0.5

<0.5

Packing

Kgs/bag

25

25

25

20

20

20

 
TYPICAL PHYSIOCHEMICAL PROPERTIES OF
LEVIGATED CHINA CLAYS (10 MICRONS) (Tulsi Brand)
 
GRADE

Property

Unit

Tulsi-059

Whiteness

-

90-95

Average Particle Size

microns

4-5

Surface Area

sq. m/gm

14-18

Sp. Gravity

-

2.7-2.8

Bulk Density*

gm/cc

0.38-0.45

Water Absorption

%

38-42

pH Value

 -

5.5-6.5

Moisture

% max

0.2

Water Soluble

%

Nil

SiO2

 %

53-55

Al2 O3

 %

35-37

Fe2 O3

% max

0.05

Mixed Oxides

% max

2.2

Loss on Ignition

 % max

1.5

Residuc on 500 mesh

% max

0.5

Packing
Kgs/bag
25
   

 

 

 

TYPICAL PHYSIOCHEMICAL PROPERTIES OF CALCINED CHINA CLAY
(Tulsi Brand)
   
GRADE

Property

Unit

Tulsi-555

Whiteness

%

92-96

Average Particle Size

microns

3-4

Surface Area

sq. m/gm

10-12

Sp. Gravity

-

2.7-2.8

Bulk Density*

gm/cc

0.32-0.36

Water Absorption

%

38-45

pH Value

 -

5.5-6.5

Moisture

% max

0.4

SiO2

 %

53-55

Al2 O2

 %

35-37

Fe2 O3

% max

0.1

Mixed Oxides

% max

2.5

TiO2

%

Traces

Loss on Ignition

 % max

6.5

Residuc on 500 mesh

% max

0.2

Packing

Kgs/bag

25

   
     
TYPICAL PHYSIOCHEMICAL PROPERTIES OF LEVIGATED CHINA CLAYS (CONFORMING TO I.P.)
(Tulsi Brand)
   
GRADE

Property

Unit

Lite KT Spl.

Whiteness

%

91±1

Average Particle Size

microns

1.5-3.0

Surface Area

sq. m/gm

10-12

Sp. Gravity

-

2.56

Bulk Density*

gm/cc

0.32-0.35

Oil Absorption

%

38-44

pH Value

 -

6.5-7.0

Moisture

% max

2.0

SiO2

 %

48-52

Al2 O2

 %

34-36

Fe2 O3

% max

0.2-0.3

Mixed Oxides

% max

2.5

Loss on Ignition

 % max

14.0

Residuc on 500 mesh

% max

0.5

Packing

Kgs/bag

20

   
     
TYPICAL PHYSIOCHEMICAL PROPERTIES OF CALCINED CHINA CLAYS
(Tulsi Brand)
   
GRADES

Property

Unit

KT-555

KT-055

Whiteness

%

94-96

90-94

Average Particle Size

microns

4-5

4-5

Surface Area (BET)

m2/gm

6-8

6-8

Sp. Gravity

-

2.7-2.8

2.7-2.8

Bulk Density*

gm/cc

0.38-0.45

0.38-0.45

Water Absorption

%

38-45

38-45

pH Value

 -

5.5-6.5

5.5-6.5

Moisture

% max

0.5

0.5

SiO2

 %

56.8

58.6

Al2 O3

 %

34.6

32.2

Na2 O

 %

1.4

1.2

Cao

%

1.0

1.3

Fe as Fe2 O3

%

0.10

0.14

Loss on Ignition

 % max

6.5

6.5

TiO2

%

Traces

Traces

Residuc on 500 mesh

% max

0.5

0.5

Packing

Kgs/bag

25

25

     
       
TYPICAL PHYSIOCHEMICAL PROPERTIES OF LEVIGATED CHINA CLAYS
(Tulsi Brand)
   
GRADES

Property

Unit

Tulsi-555 Special

Tulsi-555

Whiteness

%

94-96

84-88

Average Particle Size

microns

5 -6

6 -7

Surface Area

m2/gm

6-8

6-8

Bulk Density*

gm/cc

0.40-0.45

0.40-0.45

Water Absorption

%

22-26

22-26

pH Value

 -

5.5-6.5

5.5-6.5

Moisture

% max

0.40

0.40

SiO2

 %

55-58

55-58

Al2 O2

 %

33-35

33-35

Fe2 O3

% max

0.1

0.3

Mixed Oxides

% max

2.5

2.5

TiO2
%
Traces
Traces

Loss on Ignition

 % max

0.5

0.5

Residuc on 500 mesh

% max

8.0

8.0

Packing

Kgs/bag

25

25