LKABDocument is difficult for lay people [like me]. The plasma discussion begins on page 48. My take from it is that the process is viable environmentally and economically while quality is not an issue. Some concern with increased NOX emissions though that can seemingly be ameliorated through some process involving natural gas. It looks as if 9 torches would be required for each induration unit. As an example, the plant at IOC in Lab City has six units - if I recall correctly. I would assume that not all induration units are off the same size/capacity.
https://odr.chalmers.se/bitstream/20.500.12380/256741/1/256741.pdf