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Cenospheres
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General
Information
- A cenosphere is a
lightweight, inert, hollow sphere filled with inert air or gas,
typically produced as a byproduct of coal combustion at thermal power
plants.
- A cenosphere (ceramic
sphere) is a hollow microscopic ball made of smooth silica-aluminum and
other minor ceramic elements.
- Other names for
Cenospheres are: micro balloons, micro spheres, nano spheres, ceramic
spheres, micro beads.
- Cenospheres are hard and
rigid, light, waterproof, innoxious, and insulative. This makes them
highly useful in a variety of products, notably fillers.
- Cenospheres are
essentially thin-walled glass spheres with a relative density of less
than 1.0.
- Cenospheres are unique
free flowing powders composed of hard shelled, hollow, minute spheres.
Process
- A small proportion of
the pulverised fuel ash (PFA) produced from the combustion of coal
in power stations is formed as Cenospheres. Cenospheres are made up
of silica, iron and alumina.
- Cenospheres, also
referred to as hollow ceramic microspheres, is a non-porous, inert,
hollow, alumina-silicate, micro balls that is formed by burning of
pulverized coal during power generation process.
- The cenospheres are
produced only by a highly filtered processing of the fly ash.
- Cenospheres are formed
from coal combustion ash when it is in a molten state.
Uses
- Cenospheres are
now used as fillers in cement to produce low density concrete.
- Cenospheres are
used as fillers in lowdensity concrete; in plastics and
composite materials used for manufacturing bowling balls,
kayaks, surfboards, and automotive components; and in fire
bricks, floor tiles, and insulating materials.
- They are used to
replace minerals and resins where the benefits may be as diverse
as weight reduction, improved insulation, reduced shrinkage,
improved fire resistance reduced friction, improved surface
finish or simply easier application.
Report
- Cenospheres,
derived from the inferno of coal-fired power plants, have
been used for more than 30 years to improve the qualities of
many manufactured products.
- Cenospheres
occur in minute concentrations; a ton of South African fly
ash gives rise to only one kg of
cenospheres.
- Didcot Power
Station is able to harvest the cenospheres from the lake at
Radley and approximately 400 tonnes are made available each
year.
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