03.09.2010 00:23
OKD is the only producer of hard coal in the Czech Republic; Its coal is mined in the southern part of the Upper-Silesian coal basin. more »
The Company Magazine... more
Company code of ethics
The Board of Directors of OKD has adopted a Company code of ethics that is obligatory for all the employees of the firm. It defines basic values and attitudes to enterprise that OKD conforms to in the course of its business activities.
The code of ethics is not any binding rule of law or internal directive, it represents, however, a moral obligation for each employee of OKD.
POP 2010
The types of coal
During the conversion of vegetable matter to rock it is possible to follow the virtually continuous order from the original biological material with low carbon content and high share of impurities to materials with almost 100% carbon content in the form of graphite (black-lead):
- wood
- turf
- lignite (the youngest brown coal)
- brown coal
- transitional types
- hard coal
- anthracite
- graphite (black-lead)
In fact, there is a difference in origin between the younger and older types of coal: hard coal of the palaeozoic era originated from horsetails, club-moss and ferns; young brown coal originated from trees and other higher plants.
Carbon content and calorific value of the main coal types
typ - carbon share - calorific value
lignite/ - 30 to 50% - approx. 13 MJ/kg
brown coal - 50 to 80% - 15 to 20 MJ/kg
hard coal - 80 to 90% - 18 to 30 MJ/kg
anthracite - over 90% - 26 to 30 MJ/kg
Calorific value is heat released by burning of the fuel to produce gaseous carbon dioxide (CO2), sulphur dioxide (SO2), nitrogen (N) and water vapour (H2O).
Technically speaking, coal is also distinguished according to its possible uses, for example gasifiable coal, or coking coal, coal for chemical production, etc. In the Ostrava-Karviná district the best hard coal (including the types suitable for coke production) and anthracite is extracted.
