About Graphite

What is Graphite

Graphite is the most stable form of carbon under standard conditions. Therefore, it is used in thermo-chemistry as the standard state for defining the heat of formation of carbon compounds. Graphite may be considered the highest grade of coal just above anthracite and alternatively called meta-anthracite, although it is not normally used as fuel because it is difficult to ignite.

There are three principal types of natural graphite, each occurring in different types of ore deposit:

  1. Crystalline flake graphite (or flake graphite for short) occurs as isolated, flat, plate-like particles with hexagonal edges if unbroken and when broken the edges can be irregular or angular.
  2. Amorphous graphite occurs as fine particles and is the result of thermal of coal, the last stage of coalification, and is sometimes called meta-anthracite. Very fine flake graphite is sometimes called amorphous in the trade.
  3. Lump graphite also called vein graphite occurs in fissure veins or fractures and appears as massive platy inter-growths of fibrous or acicular crystalline aggregates and is probably hydrothermal in origin.

Occurrence

Availability of Natural Graphite:
Natural Graphite is available from earth crust in metamorphic rocks in the form of ore. Concentration of Graphite is varies from 5% to 15%. Usable Graphite comes to market after the beneficiation process which involves huge quantity of water. Impurities in the ore mainly in the form of silica get separated by floating process. Using water material of good source can be purified upto 97% and above this using Hydrofluric acid purity of the material can be increased above 99%.

China produces more than 60% of Graphite among the Graphite Producing countries. India comes next in the list including Brazil, North Korea, Canada and Madagascar. However Indian graphite is considered as best among all due to its density and expansion properties.