The invention relates to a process for coking coal or moulded coal using microwave radiation in the frequency range of 20 to 3,000 MHz. Milled coal in containers or shaped moulded coal with at least one hole in it is used. Coke-ovens performing the process of the invention can be made to operate on a batch system or continuously. The coke-oven consists of a coking chamber 3 and the coking is carried out by microwave generators 12, 21 fitted into the walls. Gases produced are removed through vents. The coke then passes to a cooling zone 4 which may be fitted with photocells to take up the radiated energy. IMAGE
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