The Terraframe (formerly Talvivaara) project in N. Finland, which has ~25% pyrrhotite, has real problems with this, even in Boreal conditions, and controlling the potential for runaways in the heaps. Probably something you don't see in the lab, and assuming that you are using Sudbury tailings, which have close on 75% pyrrhotite, in practical terms this is going to be very difficult.
I think the following paper would help in this regard:
Motion planning for the heat equation
B Laroche, P Martin, P Rouchon - … and Nonlinear Control: IFAC …, 2000 - Wiley Online Library
Thank you for your answer. Unfortunately, I don't think you fully understood the question, as the paper you recommend really has no relevance whatsoever. I was referring to a highly exothermic chemical reaction which has the potential to be a catastrophic runaway.
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