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The Fly Ash Resource Center provides information on coal combustion byproducts (CCBs): Materials Research, Environmental, Standards/Quality Assurance, Marketplace. For Research see Materials Research section. See Environmental . For Standards/Quality Assurance see Standards section. Quality control, specifications. For uses see Marketplace section. See fly ash bibliography, chemistry, images, newsgroups, organizations of interest, fly ash as a pozzolan, fly ash in roadbase, fly ash in soil stabilization, and fly ash in waste stabilization. (Updated July 2005).
COAL COMBUSTION BYPRODUCTS (CCBs)
Fossil fuels are used in modern power plants
throughout the world to produce electrical energy. The inorganic residue, that
remains after pulverized coal is burned, is known as 'Coal combustion
byproducts'. Coal combustion byproducts (CCBs)
rapidly accumulate and cause enormous problems of disposal unless a way can be
found to utilize these by-products through resource recovery programs. Using
coal fly ash conserves energy by reducing the demand for typical pavement
materials such as lime, cement and crushed stone, which take energy to produce.
Each ton of fly ash used to replace a ton of cement, for example, saves the
equivalent of nearly one barrel of imported oil. Also less greenhouse gases are
produced that would otherwise contribute to global warming. Every ton of ash
reused in cement products equates to nearly a ton of CO2 savings. Coal fly ash
can also replace clay, sand, limestone and gravel, and save the energy costs of
mining such materials. In the
The production figures in
For information on
Australian coal-fired power stations produced over 13 million tonnes of total ash in 2003. Approximately 10% of this is incorporated into cement and concrete; the rest ends up in unsightly ash dams.
For information on
Fly ash Concrete in
Fly Ash concrete in
It is the intent of the Fly Ash Resource Center to promote the utilization of fly ash, boiler slag, and bottom ash through the dissemination of knowledge, research, and project activities. It is hoped the reader becomes an active participant and shares his/her knowledge and activities by signing and reading the guestbook. Increased utilization of coal combustion byproducts minimizes disposal costs (costs which are economic and environmental).
Orchid Hotel is
a good example of environmental responsibility. The Orchid Hotel in
KEYWORDS: bottom ash (les mâchefers, cenizas de fondo, ceneri pesanti, Kesselsand); boiler slag (Schmelzkammergranulat); coal combustion byproducts (CCBs).
Fly Ash : fly ash, flyash, flugasche, vliegas, flygaska, flyveaskes, lentotuhka, cendres volantes, cendre volante beton, cenizas volantes, ceneri volanti, , cinzas volantes, pernyék , ιπτάμενη τέφρα, coal fly ash, coal ash, popílek, popiołów ,pyły lotne, popolček (lietavý), летучая зола, precipitadores electrostaticos, pulverised fuel ash (PFA), poederkoolvliegas,
Pozzolan: pozolana, pozzolana, puzolana, puzolanas, puzolánicos, puzzolane materialen, pouzzolane; pouzivanych materialu, pozzolanic reaction: puzzolanische reaktion.
FLY ASH BENEFICIATION
FLY ASH BIBLIOGRAPHY
FLY ASH IMAGES
FLY ASH LIBRARY
FLY ASH MATERIAL SAFETY DATA SHEET
FLY ASH AS POZZOLAN
FLY ASH QUALITY CONTROL
FLY ASH SUPPLIERS
FLY ASH SYSTEMS
The shape. fineness, particle-size distribution, density, and composition of fly ash particles influence the properties of end use products. Fly Ash produced at different power plants or at one plant with different coal sources may have different colors. And particle size and shape characteristics of fly ash are dependent upon the source and uniformity of the coal, the degree of pulverization prior to burning, and the type of collection system used. Rapid cooling of the ash from the molten state as it leaves the flame causes fly ash to be predominantly noncrystalline (glassy) with minor amounts of crystalline constituents, such as mullite, quartz, magnetite (or ferrel spinel), and hematite. Other constituents which may be present in high-calcium fly ash include periclase, anhydrite, lime, alkali sulfate, melilite, merwinite, nepheline, sodalite, C3S,and C2A.
Fly Ash particles, carried out of the boiler by
the exhaust gases, are extremely variable but have some characteristics of
interest. The particles are generally less than 250 micrometres
in size, spheroidal, have a high mechanical strength,
a range of densities from about 3 to less than 0.6, a melting point above
1000°C, low thermal conductivity and are mostly chemically inert. See Fly Ash
as an engineered
Materials Research is conducted at universities and organizations throughout the world. This research leads to new ideas and uses for CCBs.
A quality assurance program is required in order to assure the end user that the CCB is acceptable for its intended application by meeting certain standards. See fly ash quality control tests.
Written by R. Majko.
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FLY ASH RESOURCE CENTER