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Fly Ash - No More A Waste 

Fly Ash Notification -3 November 2009 
Fly Ash - No More A Waste 
Types of Coal Ash
Properties of Fly Ash
Areas Of Fly Ash Utilisation

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FLY ASH - NO MORE A WASTE

Nearly 75% of India's total power generation capacity is thermal, of which coal based power generation is nearly 90% and diesel, wind, gas and steam adding to about 10%. High ash content in the range of 30 to 50% in Indian coal is the major cause for large voluminous quantities of coal ash. India's dependence on coal as a major source of energy had been of prime importance in the past and shall continue in this millennium, and therefore fly ash management would remain an important area of national concern. 

There are  4 major thermal power plants in Korba district  generates  about 24000 metric tons per day or 8.7 million tons of fly ash annually. This is nearly 90% of the total ash generated in the State.

Due to increasing environmental concern and growing magnitude of the problem it has become imperative to manage fly ash. More importantly because fly ash has tremendous potential to be utilized. Keeping in view this versatility of fly ash, several Government and NGOs are involved in fly ash utilization and safe disposal efforts in the country.

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TYPES OF COAL ASH

Coal ash is the residue of the coal combustion process involved in the thermal power plants. The types of coal ash from coal based thermal power plants are :

(i)  Fly Ash

Collected from different rows of electrostatic precipitators

(ii) Bottom Ash

Collected at the bottom of boiler furnace

(iii) Pond Ash

Mixture of bottom ash and fly ash as available in ash disposal ponds.

Of the total fly ash generated from the thermal power plants nearly 20% is the bottom ash and nearly 80% is the fly ash. Bottom ash and fly ash are sluiced together with water as ash slurry to the ash ponds.

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PROPERTIES OF FLY ASH

Fly ash as a material is siliceous or aluminous with pozzolanic properties. It is refractory and alkaline in nature, having fineness in the range of 3000-6000 sq.cm./gm. The fine particles of fly ash by virtue of their lightness becomes air borne.

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AREAS OF FLY ASH UTILISATION

Fly ash can be used for multifarious applications. Some of the major areas of fly ash utilization are as follow :-

FLY ASH BRICKS

Durable

Low water absorption

Less consumption of mortar

Economical and eco-friendly.

Low energy consumption

No emission of green house gases.

CELLULAR LIGHT WEIGHT CONCRETE

Light in weight ( density ranges from 400-1600 kg/m3)

Better insulation

Fire resistant, better acoustic behavior

Better workability.

FLY ASH CEMENT
ROADS, FILLS & EMBANKMENTS

Light in weight than earth.

Advantageous in weak/clayey sub-soil

Lower transportation cost than earth

Faster rate of consolidation.

Better compaction characteristics

High permeability.

Cost effective & eco-friendly.

BACK FILLING IN OPEN CAST MINES
STOWING IN UNDERGROUND MINES

AGRICULTURE APPLICATIONS  

FIELDS CROPSS

FORESTRY

FLORICULTURE

RECLAMATION OF WASTE LAND

Improves permeability status of soil.

Improves fertility status of soil
   

Enhances root proliferation

Improves soil texture

Reduces bulk density of soil

Improves water holding capacity

Optimizes pH value

Improve soil erosion

Reduces crust formation

Provides micro nutrients  - Fe, Zn, Cu, Mo, B, etc.

Provides macro nutrients - K, P, Ca, etc.
FLY ASH BASED COMPONENTS FOR CONSTRUCTION INDUSTRY
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PAVEMENT BLOCK

Durable

Economic

Faster & easy construction

Self interactive

Aesthetic

SINTERED AGGREGATE

 

Substitute for clinker & natural aggregates

WOOD SUBSTITUTE - DOORS &  PANELS
100% wood free
5-7 times stronger than wood
Resistant to weather, termite, fungus & fire
GRANITE SUBSTITUTE
Good finish
Properties comparable to natural granite
CERAMIC TILES
Less water absorption & firing shrinkage
Less energy intensive
PAINTS & ENAMELS
Less oil absorption
Corrosion & abrasion resistant
Durable
RECLAMATION OF ASH PONDS FOR HUMAN SETTLEMENT
Friendly to flora & fauna
Abandoned ash ponds can support buildings.
No settlement
No significant radioactivity.
Economic use of ash filled land.

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All efforts have been made to make the information as accurate as possible, Chhattisgarh Environment Conservation Board, will not be responsible for any loss to any person caused by inaccuracy in the information available on this Website. Any discrepancy found may be brought to the notice of Chhattisgarh Environment Conservation Board.