Rollie, Sulfur is in coal. Sulfur mixing with water makes acid, acid rain. That would explain why it's corrosive. Would need lime to neutralize acid. So if concrete companies are mixing fly ash in with the mix, that would explain why concrete is chipping up. Portland cement has lime in it. Never really thought about that, but it makes perfect sense.
Bethlehem Steel, burns harbor, In. had over 100 cells in their battery of coal ovens. Each would hold a trail car load of coal. They would bake out the sulfur, make coke, which you didn't want to drink or snort, and use the coke as an energy source in the BOF, basic oxygen furnace. Within 6 months, all the copper in the air conditioners was eaten up my the acid. Can't imagine what that does to a person's lungs. I hated working at the coke ovens. The air conditioners were damaged in no time.
So, I guessing to turn coal into fertilizer with out acid, sulfur will have to be removed. They are going to make coke out of the coal. Then the coal industry isn't totally dead. Hope today's coke oven's don't smell like those did 50 years ago or some people in Terre Haute will be screaming.
Be a good idea to ask your ready mix company if they add fly ash, I definitely will next time.
So did the EPA remove fly ash for fertilizer in 2014? geo
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