The main raw material of vitrified microbead ore is volcanic rock. After special mining and crushing, the ore is made into ore sand as the raw material for producing vitrified microbeads.
Volcanic rock is a type of acidic lava produced during volcanic eruptions, a vitreous rock formed by rapid cooling in air, and it gets its name from its pearly fracture structure. Volcanic rocks are divided into: perlite (Perlite), obsidian, pitchstone.
After preheating volcanic rock at 400～500℃, it expands at 1180～1350℃ High Temperature (expands 7～30 times or more at 1300℃), forming expanded volcanic rock rich in closed and open pores. When expanding at 1070～1080℃ High Temperature , 6 microcomputers Precision separately control 6 expansion stages, namely High Temperature outer layer softening, High Temperature inner layer softening, instantaneous controlled gasification expansion without shell breaking, thin shell expansion, surface shell vitrification, closed pore forming into spheres. This forms closed-cell perlite vitrified microspheres with a sealed outer shell. It is a non-toxic, odorless, acid-resistant, alkali-resistant non-metallic spherical hollow bead. Expanded vitrified microbeads have low density, 40～250㎏/m3, low thermal conductivity, 0.028～0.048W/(m·K)-1 at 200～500℃, low hygroscopicity, Safe the service temperature is generally 800℃. The service temperature of vitrified microbeads Safe is 1050℃.
1. Physical properties: Volcanic stone ores include perlite, obsidian and pitchstone. The differences between the three are that perlite has circular arc-shaped stripes formed by condensation, which is called perlite structure, with a water content of 2% to 6%; pitchstone has a unique resinous luster, with a water content of 6% to 10%; obsidian has glass luster and conchoidal fracture, with a water content generally less than 2%.
2. Chemical composition: Volcanic rock is an acidic heat-resistant and thermal-insulating raw material in terms of chemical composition. However, due to its high content of K2O and Na2O, its refractoriness is reduced. Therefore, whether perlite, obsidian or pitchstone, they are not Refractory Material in the strict sense. However, due to the extremely low bulk density and thermal conductivity of expanded volcanic rock glazed hollow beads, it is an excellent Insulation Material , such as glazed hollow bead Insulating Brick , glazed hollow bead thermal insulation castable, closed-cell glazed hollow bead thermal insulation mortar, etc.
General Chemical Composition of Perlite, Obsidian and Pitchstone (ω/%)
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