What material is suitable for evaporating hydrofluoric acid, fluorosilicic acid, and soluble fluoride salts?
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What material is suitable for evaporating 10%-20% hydrofluoric acid, 10% fluorosilicic acid, and 10-20% soluble fluoride salts? Graphite? Monnal? Steel-lined PTFE? Or something else? Thank you all, guys
Graphite heat exchangers and graphite evaporation tanks are recommended.
What are the operating temperature and pressure?
For evaporators, separators, and condensers, it is recommended to use phenolic resin-impregnated graphite at high temperatures; for circulation pumps, discharge pumps, and feed pumps, ultra-high molecular weight polyethylene can be used when the temperature is below 100 degrees, while FPA material is preferred when the temperature exceeds 100 degrees. For other pipes and valves, materials such as steel lined with ECTFE or F46 can be used. This evaporation poses a challenge: the decomposition of fluorosilicic acid. The process design needs to be optimized before secondary steam enters the condenser.