If there were a material that could be used in systems with high temperatures and high concentrations of HF and sulfuric acid

This material is hard to find; you might want to try ceramic or silicon carbide materials instead.

:Lol, tantalum, tantalum-tungsten alloys! Production by Orient Tantalum Industry

Is 50% HF for tantalum okay? ? Doubt!

This post was last edited by zxf905 on 2015-6-30 08:33. Tantalum exhibits excellent corrosion resistance in solutions of acids, salts, and organic compounds; with the exception of strongly alkaline solutions, acidic fluorides, fuming sulfuric acid, and free sulfur trioxide, it maintains good corrosion resistance in all industrial solutions at temperatures below 300°C. Tantalum can rapidly form a thin surface oxide film that covers the metal matrix in almost any environment. This oxide film is extremely thin and dense, impermeable to almost all media, and it can heal itself immediately if damaged. Thanks to this excellent protective coating, tantalum possesses exceptionally superior corrosion resistance. The corrosion resistance, high thermal conductivity, and processability of tantalum enable its wide use in the chemical and metallurgical industries. Another advantage of containers made of tantalum is that they do not contaminate the substances contained within them; they can therefore be used as reaction vessels for pesticides, pharmaceuticals, and other fine chemical products. Tantalum has excellent thermal conductivity, making it suitable for manufacturing various heat transfer devices such as heat exchangers, condensers, plug-in heaters, spiral heat transfer coils, and tubular elements. In tantalum alloys, some of them have better corrosion resistance in certain solutions than pure tantalum, for example those containing

:) Of course, when aqua regia is used in hydrometallurgy, polytetrafluoroethylene-plastic king is commonly used as a reactor.

Polytetrafluoroethylene doesn’t work well above 180 degrees