Re: How to supress Pyrophoresis - steaming iron

Iron reacts very slowly with water, it should not produce
such amounts of heat to form steam. I don't think steel would
be more reactive.

Is the metal heated by an external source? Those fatty acids, specially
wen mixed with amines (nitrogen source) may be a suitable medium
for bacterial growing. This would account for stinking.

"hanson" <[EMAIL PROTECTED]> escreveu na mensagem
news:[EMAIL PROTECTED]
> Now that the professionals in sci.chem, and sci.environment.waste
> weren't able to furnish neither clever answers nor solutions, let me
> repost it with the real, the dedicated to the core specialists, the
> environmentalists:
>
> Machining (turning, shaping, grinding, etc) of steel parts generates
> iron wastes (chips, spirals, fines) containing small amounts of lubes
> as mineral oils, glycols and fatty acid amid/amines and water.
> This iron waste is drained to form sludge cakes that are accumulated
> in a wet condition in huge piles in open transporter bins (30x12x5 ft).
> When full, the stuff is hauled to the steel manufacturers for recycling.
>
> In all too many cases whenever the stuff is laying there for some
> weeks it gets so hot that steam and stink begins to rise from the pile.
> Clearly it's the reaction of the steel with the water.
>
> Question: what can be done to prevent this nasty steam occurrence?
> Out of the question are: Drying, Watering, Covering or Diluting with sand.
> Any ideas anybody?
>


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