The present invention relates to an apparatus for thermal or thermochemical treatment of material 12, more particularly battery cathode material 14, more particularly calcination treatment, comprising a housing 16 in which process chamber 20 is located. The material 12 or the support structure 40 loaded with the material 12 can be transported into or through the process chamber 20 in the transport direction 30 by the transport system 28. The process chamber atmosphere 50 prevailing in the process chamber 20 may be heated by the heating system 48. There is a process gas system 64 through which process gas 66 can be supplied to the process space 20, which is required for heat treatment of the material 12. The process gas system 64 includes a plurality of local injection units 68, which are targeted onto the support structure 40 on which the process gas 66 is loaded with the material 12 or the material 12. Arranged and configured to be discharged in a manner, the process gas is discharged into a plurality of local process gas streams 70, each having a main stream direction 72. The present invention also specifies a method of thermal or thermochemical treatment of material 12, wherein process gas 66 is released in a targeted manner onto material 12 or support structure 40 on which material 12 is loaded. , Process gas is discharged into a plurality of local process gas streams 70 each having a main stream direction 72.
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