Rotary kiln - GIF

Rotary kiln.

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Previously:

Brick kiln workers - GIF
Cement rotary kiln - GIF
Kiln gun - GIF
Loading red hot pots into a kiln - GIF
Raku pottery kiln and glazing technique - GIF
Wood kiln - video

What industry is this? I have experience with large rotary dryers for wood. I'm interested with the antenna-like things they have stuck to the outside of the housing. I've never seen that before.