A simple equation with which we can describe the grinding momentum is M x V (mass x velocity). This enables us to view how an attritor fits into the family of grinding mills. In conventional ball mills large size grinding media are used and its run at a very low rpm which ranges […]
Particle size reduction has undergone many changes. In 1922, Dr.Szegvari hit upon a new idea of using pebble, a drill press, a gallon can and a special agitator desined for the drill bit to achieve a fine dispersed slurry. With in an hour, he invented an apparatus that would produce the exact requirement what he […]
Continuous grinding Ball Mills available for dry grinding process. But as we explained, the grinding efficiency is limited in Ball Mills.
Lot of developments took place in the grinding systems and classification systems. There are very huge capacities Ball Mills are available across the Globe for Dry Grinding Process.
However the very high energy consumption, problems in […]
In the conventional particle size reduction process Ball Mill is the common equipment worldwide used. Ball Mill can be used for size reduction to certain level of fineness. This can be either Dry Milling or Wet Milling. Dry Milling can be Batch type or Continuous type.
In Batch type Dry Grinding Process the material to […]
There are two methods of milling a) Dry Milling
b) […]
Powder Preparation:
The preparation of Alumina Powder for any fabrication technique is very important step to get better mechanical strength with a fine grained micro structure.
The finest ground material with very minimal process contamination is the core process step in getting the best powdered Alumina raw material for producing any Advanced Ceramics products to meet any […]
The number of Solid phases of Alumina described in existence will be more than 25 and actually speaking it is doubtful whether all really exist. The list includes Amorphous Alumina, Hydrous Alumina, Anhydrous Alumina, Crystalline hydroxides and Oxides. Some are found in nature while others are artificially developed.
The pure forms found in nature are corundum, […]
SG
SD
CP
G
Surface area (m2/g)
9.6
6.7
3.8
6.5
Particle size distribution (%)
Component
Sol-Gel
Pyrolysis
Controlled Precipitation
Gibbsite (Bayer)
Al2O3
99.93
99.9
99.73
99.52
SiO2
335
365
1250
300
Fe2O3
65
160
840
270
Na2O
110
195
210
4000
K2O
30
110
100
60
Mn2O3
10
15
10
15
TiO2
40
50
30
45
CaO
20
25
150
60
MgO
40
70
10
35
CuO
25
25
10
15
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Note : all impurities in ppm
Physical Property
High Purity
UHP
Tabular
Particle Size (micron)
A.v. 0.6*
< 1.0
-
Density (gm/cm3)
Fired 3.92
Appar 3.65
Phase
alpha
alpha
Alpha
Sp. Surface area (m2/gm)
8to10
10to12
-
Chemical Analysis
Purity
99.9
>99.95
99.4
SiO2 ppm
