In a microwave plasma, plasma gas is ignited and maintained by using microwave radiation, which can lead to temperatures in the range of up to several thousand degree Celsius. The microwave plasma can burn without the need for an exothermic fuel oxidation reaction and it is possible to influence its geometric shape. These are ideal conditions for high-temperature application in metallurgy and high-temperature process engineering. The goal is the implementation of a microwave plasma burner at the Chair of Process Engineering and Industrial Environmental Protection at the Montanuniversität Leoben (MUL VTIU) for partial melting/spheroidization of mineral powders. The plasma state may provide efficient energy input and homogenous energy distribution in the sample compared to other burner designs. It was further investigated which arrangements allow for maintenance of an atmospheric microwave plasma with argon as the plasma gas. Realization of the project was in three steps. Two different plasma-burners were constructed, following ignition tests using microwave generators operating at 2,45 GHz. As a final application test a sample of corundum powder was spheroidized and the energy demand required for melting the sample as well as a performance factor of the burner were calculated.