sri lankan vain graphite

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GRAPHITE By : Chanaka Wickramasinghe Mineral Resources and Technology Degree Program Uva Wellassa University Of Sri Lanka

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Page 1: Sri Lankan Vain Graphite

GRAPHITE By : Chanaka Wickramasinghe

Mineral Resources and Technology Degree Program

Uva Wellassa University Of Sri Lanka

Page 2: Sri Lankan Vain Graphite

What is Graphite?

Graphite is a natural form of carbon.

Chemical formula C.

Hexagonal crystalline structure.

It occurs naturally in metamorphic rocks such as marble, schist and gneiss

Page 3: Sri Lankan Vain Graphite

Graphite is;

- Excellent ELECTRICITY conductor

- Heat resistant (Melting Point 3927 C°)

- Chemical reaction and Corrosion resistant

- Resistant to acids and oxidizing agents

- Lubricating

Page 4: Sri Lankan Vain Graphite

Types of Graphite

Page 5: Sri Lankan Vain Graphite
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Distribution of graphite occurrences

Graphite deposits occur in Highland complex and Wanni complex.

Highland complex – High T and moderate P(Granulites )

Wanni complex – Relatively Low T, P (upper amphibolite to granulite)

Vijayan Complex – Relatively Low T, P

(Amphibolites )

Wanni

Complex

Vijayan

Complex

Highland

Complex

Page 7: Sri Lankan Vain Graphite

Applications

Page 8: Sri Lankan Vain Graphite

Applications

Page 9: Sri Lankan Vain Graphite

Applications

Page 10: Sri Lankan Vain Graphite

Problem Statement

Page 11: Sri Lankan Vain Graphite

The use of graphite in Sri Lanka has a long history, from 1675.

Sri Lankan graphite is very popular all over the world for its high purity.

There are two major mines for graphite, KahatagahaKolongaha and Bogala.

The largest mine is Kahatagaha-Kolongaha close to Matale-Kurunegala road. This is deeper than 650 m.

Page 12: Sri Lankan Vain Graphite

Runoff mine Graphite

Cross section of the mine

Page 13: Sri Lankan Vain Graphite

Grizzly screen

Output – 203.2 mm

Rejected +203.2 mm

Page 14: Sri Lankan Vain Graphite

TrommelScreen

Main Trommel

Input – 203.2mm

Output Sizes

-25.4mm

-25.4mm to -50.8mm

-50.8mm to -203.2mm

Secondary Trommel

Input 25.4mm

Output Sizes

-11.4mm

-11.4mm to -16.5mm

-16.5mm to -25.4mm

Page 15: Sri Lankan Vain Graphite

Graphite Lump Hand Sorting Stage

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Sleeve Filter

Input Size -203.2mm

Output Sizes

-50.8mm to -25.4mm

-50.8mm to – 203.2mm

-11.5mm to -16.5mm

-16.5mm to -25.4mm

Page 17: Sri Lankan Vain Graphite

Sleeve FilterParticle size Product

+10mm Lumps

1.7 – 5 mm Bold chips

0.5 -1.7 mm Fine Chips

-10 + 60 mesh Flakes

-40 + 100 mesh Flake type powder

-200 mesh Powder

“Pitty” lump (totally dust) - 99% carbon.

Hard lump - 97% carbon.

Bright lump - 94% carbon

Page 18: Sri Lankan Vain Graphite

High Quality, Scalable GrapheneProduction

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References

• Dissanayake, C. B. 1981. The origin of graphite of Sri Lanka. 3:1-7.

• Katz, M.B 1987. Graphite deposits of Sri Lanka: aconsequence of granulite facies metamorphism. 22, 18-25.

• Wilbert Kehelpannala, K. V. 1995. Origin of vein graphite in Sri Lanka –another view. 19-24.

• http://www.fortunegraphite.com/graphite_uses.php

• Kahatagaha Graphite Lanka Limited – Chamara Jayawardhana and Jayashanka Bandara

Page 25: Sri Lankan Vain Graphite

Get in action

Thank you

31st January, 2015