Kolgruve




Færøysk kolgruve ved Hvalba.


Ei kolgruve er ei gruve der ein hentar ut steinkol, anten under eller over jorda.


I 2004 var verdsproduksjonen av kol på ca. 4,6 milliardar tonn steinkol, av dette hadde Kina ca. 40 prosent og USA ca. 20 prosent. Steinkol blir au foredla til koks, som blant anna blir bruka til framstilling av stål. Kol er ofte brukt i energiverk, i varmeanlegg eller direkte i heimen. Nye metodar og maskinar blir ofte bruka til å grava ut kol.


Kol ligg under jordoverflata og er danna av organisk materiale som døde dyr og planter, som har eksistert for millionar av år sidan. Det finst stadig store mengder av kol, som stadig er den mest viktige energikjelda i verda. Gasseksplosjonar og ras er ofte årsak til mange dødsulykker i minesjaktene. Særleg før i tida var dødsrisikoen stor.



Bakgrunnsstoff |



Kjelder |



  • Denne artikkelen bygger på «Kulmine» frå Wikipedia på dansk, den 26. januar 2011.







-

Popular posts from this blog

Proving the learnability of XOR function by a particular neural networkhow to find the input for this...

Image
Is this Paypal Github SDK reference really a dangerous site? Sort array by month and year What is Tony Stark injecting into himself in Iron Man 3? What is the purpose of a disclaimer like "this is not legal advice"? Will the concrete slab in a partially heated shed conduct a lot of heat to the unconditioned area? School performs periodic password audits. Is my password compromised? Too soon for a plot twist? Issue with units for a rocket nozzle throat area problem Can I challenge the interviewer to give me a proper technical feedback? Is it appropriate to ask a former professor to order a library book for me through ILL? ...
Read more

Why is system upgrade showing unstable version when upgrading in backend?System Settings > System Upgrade link does not existsComposer Error While upgrading magento version 2.1.6 to 2.2.2How to upgrade magento 1.4.0.0 to above 1.6 versionIssue with upgrading Magento Version from 2.1.7 to 2.1.12Magento 2.2.5: Error on running setup: upgrade after upgrading Magento from 2.2.2 to 2.2.5Are there any Magento Code Release Notes?getting error when upgrading from Magento 2.1.5 to Magento 2.2.6Will the installed third party plugins upgrade when we upgrade Magento version via composerWhy PHP Settings Check and Checking Component Dependency showing error during Magento 2.3 upgrade?Fatal error: Out of memory (in composer) during upgrade Magento2.2.1 to Magento 2.3 when run composer update command

Image
Can a Knock spell open the door to Mordenkainen's Magnificent Mansion? Writing in a Christian voice Would this string work as string? Turning a hard to access nut? New Order #2: Turn My Way Capacitor electron flow How can I, as DM, avoid the Conga Line of Death occurring when implementing some form of flanking rule? How to preserve electronics (computers, ipads, phones) for hundreds of years? Pre-Employment Background Check With Consent For Future Checks Started in 1987 vs. Starting in 1987 Calculate Pi using Monte Carlo What (if any) is the reason to buy in small local stores? How to test the sharpness of a knife? Center page as a whole without centering each element individually Unfrosted light bulb Trouble reading roman numeral notation with flats Why is implicit conversion not ambiguous for non-primitive types? Why would five hundred and five same as one? What is the period/term used describe Giuseppe Arcimboldo's style of painting? Wha...
Read more

Magento2: How to add a new product type

Image
Instead of Universal Basic Income, why not Universal Basic NEEDS? Where is the 1/8 CR apprentice in Volo's Guide to Monsters? Brexit - No Deal Rejection Why must traveling waves have the same amplitude to form a standing wave? Why are there 40 737 Max planes in flight when they have been grounded as not airworthy? How to make healing in an exploration game interesting Is it true that real estate prices mainly go up? Use of プラトニック in this sentence? Converting Functions to Arrow functions Professor being mistaken for a grad student Why did it take so long to abandon sail after steamships were demonstrated? Theorems like the Lovász Local Lemma? Is having access to past exams cheating and, if yes, could it be proven just by a good grade? How do anti-virus programs start at Windows boot? How to explain that I do not want to visit a country due to personal safety concern? An Accountant Seeks the Help of a Mathematici...
Read more