October 11, 2019
Fly ash has a number of favourable properties
FaL G technology has been successfully practised with even low purity of lime
and gypsum, obtained as wastes of other industries," he observes."In case of
FaL-G bricks, instead of hydrated calcium aluminate phases formed from the
flyash-lime reaction, the presence of gypsum leads to the formation of calcium
sulphoaluminate hydrates which render quick setting and hardening to the
product.
Fly ash has a number of favourable properties which are suitable to make
bricks. "In a typical 130-MW capacity thermal power plant in India, the coal
consumption is nearly 85 tonnes per hour while the ash generation is as high as
35 tonnes per hour. Out of this, 80 per cent is fly ash and 20 per cent is
bottom ash.Clay fly ash bricks, calcium silicate bricks, cellular concrete,
mixing with cement in small quantities, fly ash — gypsum products and sintered
light weight aggregate are some of the potential items in building construction
activities.K. While some of these pits can be kept open for rain water
harvesting, a large number of these can be filled up for reclaiming and
implementing afforestation programme.In the open cast mining sector, a large
number of mine pits are generated during harnessing the mineral resources
particularly in coal sectors.
It is expected that, in the year 2020, Indian
thermal power plant will consume nearly 380 MT of coal and produce 140 MT of
ash," says noted scientist and former director general of Council for Scientific
and Industrial Research (CSIR) Professor Dr P.The generation of fly ash from the
thermal power plants has increased considerably all over the world due to
production of electric energy from abundantly available non-coking coal.A
developing country like India, avails nearly 70 per cent of the total energy
required from coal fired thermal power plants using low grade coal with ash
content in the range of 37 to 45 per cent. In order to have an environment
friendly sustainable development, all the fly ash producers need to undertake
and encourage others the implementation of above programmes so that, like other
developed countries, the fly ash produced in India can be fully utilised."The
waste lands particularly, the low lying areas can be filled up with fly ash and
over this after placing the top soil, plantation programme can be taken up to
make these areas green.
At present, about 25-30 per cent of total fly ash
produced in India is being used in different sectors.Bhubaneswar: All over the
world, the biggest producer of electrical energy is the coal-fired thermal power
plants.The scientist Dr Jena suggests that fly ash can be utilised in four
potential areas such as back-filling of open cast mine pits and stowing
underground mines and developing waste land, production of cement, bricks and
other building materials, construction and lining of irrigation canals and
production of manure for agriculture and soil conditioning.
As a result, in many
countries in the world, these are in production on a large scale. For back
filling, these areas the fly ash along with over burden will be very useful.
During production of thermal energy from coal, a large amount of fly ash and
bottom ash are produced and rejected at the site causing a lot of pollution on
the land, water and air.. Jena. Both wholesale
hot water tap electric faucet the state and the Central governments should
provide the necessary technology and give incentives to the fly ash producers
and users, contends Dr Jena. As the fly ash contains mostly silica with various
types of nutrients, it can be used for reconditioning in the alkaline soils for
agriculture and tree plantation purposes," he adds. At the same time, with
imposition of various environmental rules and regulations — efforts are being
made to utilise the fly ash.Nearly 55 per cent of the coal produced in the
world, is utilised for thermal power generation. Recently, with the development
of fly ash — lime — gypsum (FaL-G) high strength bricks, the utilisation of
flyash is considerably enhanced. In this way, a huge quantity of the fly ash can
be utilised, points out the scientist
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