February 22, 2010

Improvement in the Quality of Indian China Clay after Various Treatments

In our earlier post [Beneficiation of China Clays] we have discussed regarding the different processes employed for the beneficiation of china clays. The various treatments of beneficiation help to enhance the required chemical constituents through: (a) elimination of the mineral and other impurities, and (b) concentration by achieving required particle size and thus, improve other physical and optical properties for the china clay.     

The following table shows the improvements in the quality of china clay after various treatments:
Constituents %
Feed
Method of Beneficiation
Wet Screening (Product <50 µ)
Hydrocycloning
High Intensity Magnetic Separation (HIMS)
<50 µ
<20 µ
<20 µ
After HIMS
SiO2
82.5
54.9
54.9
46.4
46.4
46.8
TiO2
0.10
0.32
0.32
0.22
0.22
0.10
Al2O3
10.7
30.6
30.6
37.5
37.5
38.0
Fe2O3
0.47
1.21
1.21
1.10
1.10
0.81
CaO
0.03
0.11
0.11
0.12
0.12
0.12
MgO
0.15
0.37
0.37
0.25
0.25
0.25
K2O
2.35
2.51
2.51
1.89
1.89
1.37
Na2O
0.12
0.29
0.29
0.13
0.13
0.10
LOI
2.95
9.69
9.69
12.29
12.29
12.44
% <2µ
--
39
39
50
50
52
Yield %
--
25
--
75
--
90

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