What are the fluoride-resistant materials?
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This post was last edited by lzy4225925 on 2016-1-7 at 14:25. I would like to ask fellow enthusiasts: what are the materials resistant to fluorides? Medium: calcium fluoride, barium fluoride, strontium fluoride, hydrofluoric acid. Operating conditions: ~120°C, atmospheric pressure. The equipment is used for the evaporation and concentration of the aforementioned products, which contain small amounts of HF
Teflon anti-corrosion spraying, as well as processes such as ETFE, FEP, and PFA, can all solve this issue. The main raw material is polytetrafluoroethylene.
120 degrees – that’s quite a high temperature. Well, in the production of fluorides, an excess of hydrofluoric acid is generally used. The key lies in choosing the right material for hydrofluoric acid; it’s sufficient to use graphite impregnated with tetrafluoride right from the start. I’ve worked with one or two companies that use this method, and the results are good. It’s not convenient for the manufacturers to discuss this publicly. How about we talk via a private message so I can help you solve the problem
It is recommended to use a graphite concentration unit, the main equipment of which includes: graphite heaters (graphite reboilers), graphite flash tanks (vapor-liquid separation tanks), graphite pre-concentrators, graphite condensers, water jet injectors, etc. Graphite-based chemical equipment can be used for extended periods at a boiling point of 48% hydrofluoric acid without experiencing corrosion.
The price of graphite heat exchangers is not as high as it was over thirty years ago, when imported equipment was more common and thus its prices were higher. In the past two decades, domestically produced graphite-based chemical equipment has taken over the domestic market, and their prices have dropped from over 10,000 yuan per square meter for imported equipment to just over 1,000 yuan per square meter for domestic ones. The quality of these domestic devices has improved significantly, and they are fully capable of meeting the requirements specified for A4-grade non-metallic pressure vessels.
A reactor with a PTFE lining will suffice
Is PTFE lining only suitable for conditions where the temperature is not very high and the fluoride concentration is not very high?
Your definition like this is inaccurate
I also need such an evaporation concentration reactor