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| | Post Date: 2007-1-9 Expiry date: 6 months |
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1，Introduction
The perlite is one kind naturally forms contains the silicon. The perlite has the most obvious characteristics is distinguishes between other volcanic rock: When the pearlite is rapidly heated up to its softening point (1000.C), its volume can inflate to original volume 10-40 time. From this the pore structure inflated perlite which forms has the low density and Fine properties of keeping cold and thermal. In addition, the inflated perlite also has non-toxic and the non- pollution characteristic.
The properties and index of expand perlite
Physics Performance Chem. Performance
Appearance
Grain
Density
Fireproof
Soft point
Melting point
Rate of water White, Granule
0.15-20mm
30-190kg/m3
Not burn
890．c-1100．C
1280．c-1350．C
The weight ratio does not surpass 0.5% Chemical ingredient（%） SiO2:70-75 CaO:0.1-2.0
Al2O3:12-16 Na2O:2.5-5.0
Fe2O3:0.15-1.5 K2O:1.0-4.0
MgO:0.2-0.5
Chem.
Characteristic Does not dissolve in the strong alkali or the hydrofluoric acid
In thick mineral acid slightly soluble 〈2%
hard to dissolve in the weak mineral acid or the thick organic acid . < 0.1%
PH 6.5-7.5
2,Performance
A, Fine properties of keeping cold and thermal
When perlite in 1000.C volume expansion, forms the inflated one interior has the firm pore and the mini atureartillery structure. From this the pore structure, it is the mainly reason that inflated perlite has the light quality and fine properties of keeping cold and thermal.
Under atmospheric pressure condition, inflated perlite thermal conductivity and inflated perlite density have close correlation. The inflated perlite granularity and the density change deeply affecting the inflated perlite thermal conductivity. If damages the inflated perlite pellet, can create the density elevating, thus influence inflated perlite thermal conductivity.
B, Durability
The perlite has the durability and the stability as naturally forms the mineral substance.
3.Use
The widespread application uses to construct, electric power, petroleum, chemical industry, metallurgy, textile, agriculture and food.
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