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Suggested metal or coating for dryer for ferrous sulphate

We have Rotary vacuum dryer and Dry ferrous sulfate ⇦this on eBay or Amazon [affil links] in it at 180° C temperature & high vacuum condition. Suddenly we found that Dryer is corroding and oil is leaking from shaft. Please give your suggestion to repair this dryer either by coating with some other material or replacing SS 316 with another metal.

Patel Divyang Bhulabhai
chemical business - Navsari, Gujarat, India
May 21, 2011

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