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Vermiculite is a layer-structured metamorphic rock of gibbsite silicate. Rich in magnesium, it comes from hot-liquid-eroded or weathered phlogopite. When it is heated to lose water and expands, lt turns curvingas a leech. Therefore is called vermiculite.lt can be divide into original vermiculite and expanded vermiculite. color it can also be divided into golden vermiculite and white vermiculite.
physical and chemical quota of vermiculite
Being differently hydrated and oxidation, the same vermiculite may have different chemical compositions .Generally, its chemical compositions are as follows:
Chemical quota: Mg x (H2O)(Mg3-x)(ALSiO3O10)(OH2)
Molecular |
SiO2 |
MgO |
AI2O3 |
Fe2O3 |
FeO |
K2O |
H20 |
CaO |
PH |
Loss in buring 800°C/Hour |
Name |
Silicon |
Magnesium |
Aluminium |
Iron |
Irnon |
Potassium |
Hydrogen |
Calcium |
PH |
4.5-7.5 |
Content% |
37-42 |
11-23 |
9-17 |
3.5-18 |
1-3 |
5-8 |
7-18 |
1-2 |
7-8 |
Physical properties of Vermiculite
Vermiculite sheet Density |
Expanded vermiculite Porosity |
Hard-ness |
Melting |
Compressive |
Index of |
Moisture |
Moisture |
Anti |
Antibio-ticity |
Corrosion |
Kg/m3 |
Kg/m3 |
°C |
Mpa |
Ng=1.525-1.561 |
% |
% |
||||
1100-1200 |
110-280 |
1-1.5 |
1320-1370 |
100-150 |
Ng=1.545-1.581 |
7 |
< 2 |
good |
good |
Alkali- |
1.reletive humidity 100% 24H 2. Frozen and melte for 15 minustes in 20 under zero, it’s aize won’t chenge
Norms of raw vermiculite (Implementation standards JC/T810-1996)
Categories |
No.1 |
No.2 |
No.3 |
No.4 |
No.5 |
No.5 |
Size mm |
8-16 |
4-8 |
2-4 |
1-2 |
0.5-1 |
< 0.5 |
|
Specifications of Expanded Vermiculite (Under the standards of JC/441-1996)
6-12mm 3-6mm 2-4mm 1-3mm 16-40mesh 20-40mesh 40-80mesh 60-100mmesh200mesh 325mesh 400mesh
Main Use and Functions:
Jinli Minerals is the first in North China to set up an advanced digital thermostat to cool, select, winnow and grade its products .Jinli has produced and developed many products ,which have such advantages as lighter, easy to reduce high-temperature recession heat and cold and corrosion resistant, better ventilation and water preservation , poisonousless and odorless, low hardness, burning-avoidance.
It has already been used in many fields like construction materials ,heat-resistant materials ,sheet materials costing painting painting rubber, agriculture, forestry, nursery gardening ,forage, cultivation ,pharmacy, fricition and sealing, metallurgy, etc.
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