sri lankan vain graphite
TRANSCRIPT
GRAPHITE By : Chanaka Wickramasinghe
Mineral Resources and Technology Degree Program
Uva Wellassa University Of Sri Lanka
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
Graphite is;
- Excellent ELECTRICITY conductor
- Heat resistant (Melting Point 3927 C°)
- Chemical reaction and Corrosion resistant
- Resistant to acids and oxidizing agents
- Lubricating
Types of Graphite
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
Applications
Applications
Applications
Problem Statement
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.
Runoff mine Graphite
Cross section of the mine
Grizzly screen
Output – 203.2 mm
Rejected +203.2 mm
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
Graphite Lump Hand Sorting Stage
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
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
High Quality, Scalable GrapheneProduction
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
Get in action
Thank you
31st January, 2015