it could be number 4, 5 or 6.
They are permitted for 3 machines; they have a SWP that allows 150 tons per day.
Only two stacks are evident in the latest pics.
Doesn't the new design take two rotary kilns per machine, one for pre-melt, and one for reactor?
I'd guess the latest kiln is the second half of machine #3, which is actually replacing machine #1, which was scrapped, in light of all of the above.
But it should be a good day for sheep shearing in any event.