The ceramic grain filter is made of refined pottery clays added with certain modifiers, and processed of grinding, mixing, shaping and high temperature sintering. It does not contain any substances that harmful to people or environment. They are hard and rough in surface, porous inside the structure, and have the advantages of high mechanical strength large specific surface area and porosity, When used in water treatment, they behave a activated surface property, a great amount of pollutant entrapment, less water head loss in the filter bed, lower consumption of back-flush water, stable in chemical and physical property, and long service life. Ceramic grain filters is a new and efficient filter material to increase the water yield, upgrade the water quality, and save chemicals and energy. 2. Chemical Composition Item SiO2 Al2O3 Fe2O3 CaO MgO K2O+Na2O Value 50~70% 15~25% 0.5~10% 1~5% 1~5% 3~8% 3. Technical Indexes Item Index Appearance Rough ball, porous, red & brown Grain size, μm 0.5-30 Apparent density,g/cm3 1.2-1.6 Total porosity, % 60-80 Attrition & crushing rate, % ≤2 Solubility in acid, % ≤2 Solubility in alkali, % ≤1.5 Soluble substance No any harmful elements contained 4. Product Size (mm)
Item
SiO2
Al2O3
Fe2O3
CaO
MgO
K2O+Na2O
Value
50~70%
15~25%
0.5~10%
1~5%
3~8%
Index
Appearance
Rough ball, porous, red & brown
Grain size, μm
0.5-30
Apparent density,g/cm3
1.2-1.6
Total porosity, %
60-80
Attrition & crushing rate, %
≤2
Solubility in acid, %
Solubility in alkali, %
≤1.5
Soluble substance
No any harmful elements contained
Φ0.5~1, Φ1~2, Φ2~3 , Φ3~5, Φ3~5, Φ5~6, Φ6~8, Φ8~9, Φ9~10, Φ10~12, Φ13~15, Φ16~20, Φ21~30.
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