There are some large tanks of ammonia in nearby iron works.
I wonder, what do they need it for? What is the application of ammonia in steel industry - what processes of making or processing steel require this much ammonia?
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Likely, for nitriding http://en.wikipedia.org/wiki/Nitriding . Essentially, ammonia is used as nitrogen donor. Nitrogen atoms diffuse into steel, producing hardened, corrosion-resistant surface layer.