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N/HF waste acid tank and piping deposition

January 24, 2008

Have used our N/HF waste tanks for 12 years and had no deposition problems, but over the past few months the N/HF waste acid tank and the piping servicing the tanks has developed a hard deposit. This deposit required a 20000 psi water cutter to remove the deposit. Piping was replaced, could not be cleaned. The deposit appeared dark and layered. Have sent out a deposit sample for analysis but not sure it will reveal anything. Any ideas? ferrofluoride hydrate, an iron carbide? The plant is a stainless finishing facility.
Thanks ahead of time,
Al

A.B. Simon
- Pennsylvania

NOT very clear your system to me,
BUT here is response to your question:

The waste collectors pipes are draining different solutions that are producing sediments when they are collected in the tank. It means that a processhave change.

Jose Castellanos
Minneapolis, MN

Jose Castellanos
- Minneapolis, MN, USA
March 6, 2008

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