by the stoichiometrical combustion flow along the roof 9 of the igniting kiln 3 from the inlet side to the outlet side such that they transmit their heat at the prevailing temperatures predominantly by direct radiation to the sinter mix 1 and by indirect radiation by way of the radiational heating up of the roof 9 also to the sinter mix 1 thus it is avoided that the individual burner jets are directed on to the sinter bed 1 which would bring about the described non uniformity of heating on the contrary the heat transfer takes place in the described manner substantially by the thermal radiation of all of the gases and the kiln roof 9 in the upper region of the igniting kiln 3 whereby the uniformity of heating is ensured it is furthermore of advantage that any non uniformities of heating arising in a direction transverse to the conveying direction of the sinter machine can be compensated for by differently feeding the individual burners mounted one beside the other in the end wall if it is found for example that the two outerlying edges of the belt are heated up too little it is possible to accordingly feed the two outerlying burners in the end wall more intensely the solution according to the invention thus combines the advantage of uniform heating by radial heat transfer from the upper region of the igniting kiln with the possibility of influencing the heat application to the zones which viewed in the direction of transport are arranged one beside the other this is.