Description

Microsphere is a waste product created as a result of hard coal combustion in power plants. This is a ball with a diameter of 10-800 microns filled with a gas (mainly CO2 and NO2). Walls of balls have a thickness of 0.2-3 microns, and this causes that the microsphere has a large volume with a relatively low specific gravity. The material consists essentially of silicon dioxide (SiO2), aluminum oxide (AL2O3), magnesium oxide (MgO), iron trioxide (Fe2O3), potassium oxide (K2O), calcium oxide (CaO) and trace impurities of other metals. Main advantages of the microsphere as a material are very low bulk density, excellent insulating and acoustic properties, high heat resistance and high sinterabillity. These features cause that the microsphere is an excellent filler or lightweight composite materials with excellent isothermal properties. It found a specific use in the production of refractory materials, building industry and automotive mastic.

Coal-fired power stations, installations and equipment
  • Microsphere
  • Chemical Composition
  • Vestigial elements
  • Hard coal combustion in power plants
  • heat resistance
  • thermal insulation material

Product features

Chemical Composition - SiO2 54,4 ± 5,0%
Chemical Composition - AL2O3 26,6 ± 5,0%
Chemical Composition - Fe2O3 5,5 ± 0,6%
Chemical Composition - CaO 1,1 ± 0,2%
Chemical Composition - MgO 1,6 ± 0,2%
Chemical Composition - SO2/SO3 0,6 ± 0,3%
Chemical Composition - K2O + Na2O 1,2 ± 0,4%
Chemical Composition - TiO2 0,8 ± 0,3%
Chemical Composition - Cl 0,2 ± 0,1%
Vestigial elements - As 34 ÷ 42
Vestigial elements - Ba 240 ÷ 330
Vestigial elements - Cd 19 ÷ 22
Vestigial elements - Co 24 ÷ 44
Vestigial elements - V 60 ÷ 69
Vestigial elements - Cr 80 ÷ 120
Vestigial elements - F 130 ÷ 170
Vestigial elements - Ni 66 ÷ 90
Vestigial elements - Pb 65 ÷ 80
Granulation 0 – 120 µm 15 – 20 %
Granulation 120 – 160 µm 10 – 15 %
Granulation 160 – 320 µm 65 – 75 %
Granulation 320 – 500 µm 5 – 10%
temperature 900 °C – less than 5 %
Color light gray
Bulk density in dry state 400 ± 30 [kg/m3]
Specific gravity of envelope 2200 ± 200 [kg/m3]
Relative density 690 ± 50 [kg/m3]
Mohs hardness 6 ± 1
Thermal conductivity 0,07 ± 0,03 [W/m2K]
pH of aqueous extract 7 ± 1
Melting point 1495 ± 10 [°C]
Internal pressure of balls 0,2 ± 0,1 [bar]
Falling parts max. 5 %
Content of water in the dry microsphere < 0,5 %

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