9-Feb-2010
China clay is used as an important raw material for a number of industries. The most important is the ceramic industry where it is used for the manufacture of earthware, fine china, tiles etc. and also in other industries such as paper, textile, rubber, pharmaceutical, leather, paint, plastics, petroleum, cosmetic etc. Use of China Clay as Raw Material in the Production of Refractory Insulation Bricks has been discussed in a separate post.
China clay is used as an important raw material for a number of industries. The most important is the ceramic industry where it is used for the manufacture of earthware, fine china, tiles etc. and also in other industries such as paper, textile, rubber, pharmaceutical, leather, paint, plastics, petroleum, cosmetic etc. Use of China Clay as Raw Material in the Production of Refractory Insulation Bricks has been discussed in a separate post.
India has extensive deposits of all varieties of china clays most of which after mining and processing, get consumed by the various domestic industries while around 20% - 30% of its total annual production are exported to other countries. The chemical compositions, other properties, uses, and occurrences of Indian china clays have been discussed in detail in a separate article
Indian China Clays - Properties, Occurrences and Uses
As we know that the specific requirements of china clays for different industries are different. Here in this article we present the important characteristics [see the Table below] of china clay required for ceramic industry (IS: 2840 - 1993) -
Indian China Clays - Properties, Occurrences and Uses
As we know that the specific requirements of china clays for different industries are different. Here in this article we present the important characteristics [see the Table below] of china clay required for ceramic industry (IS: 2840 - 1993) -
Characteristics
|
Requirements
| |||
Type - I (unwashed)
|
Type - II (washed)
| |||
Grade 1
|
Grade 2
|
Grade 3
| ||
Grit content / Fineness (+45 micron IS sieve, max%)
|
2
|
3
|
4
|
1
|
Particle size distribution (%)
(a) Coarser than 25 micron (max)
(b) Coarser than 10 micron (max)
(c) Finer than 2 micron (max)
|
3
10
70
|
6
12
65
|
9
15
45
|
1
5
75
|
Plasticity (by hand feel)
|
Very
|
Good
|
Fair
|
Very good
|
Water of plasticity (max %)
|
30
|
32
|
34
|
28
|
Attenberg Number (min)
|
18
|
15
|
12
|
20
|
Al2O3 % (min)
|
28
|
25
|
20
|
28
|
Fe2O3 % (max)
|
1.5
|
2.0
|
2.0
|
1.5
|
TiO2 % (max)
|
1.5
|
2.0
|
2.0
|
1.5
|
(Fe2O3 + TiO2) % (max)
|
2.75
|
3.5
|
3.75
|
2.5
|
LOI % (max) [dried at 110OC]
|
10.5
|
9.5
|
9.0
|
11.0
|
Shrinkage, linear % (max) [dried at 110OC]
|
6
|
7
|
8
|
6
|
Water absorption % (max) [after firing at 1350OC]
|
3
|
5
|
9
|
2
|
Colour after firing at 1350OC
|
Creamish white
|
Pale to dull cream
|
Light gray
|
White pale cream without specks
|
MOR (MPa) [at 110OC] (min)
|
3.5
|
3.0
|
2.5
|
4.0
|
Related Posts
- Improvement in the Quality of Indian China Clay after Various Treatments
- Indian China Clays: Properties, Occurrences, and Uses
- Beneficiation of China Clay
- Use of China Clay as Raw Material in the Production of Refractory Insulation Bricks
- Refractory Properties of Fireclay Deposits Found Around Bihar, Bengal and Jharkhand in India