Wet Process Phosphoric Acid Manufacturing

Not enough information as usual. Concentrations of compounds DO affect the effects on the containment material. Acids are notorious for this.

Also, chemical species, if they are given as a pure substance, are listed as their molecular form. F₂, Cl₂, Mg, and Al would be examples of these. On the other hand, if they are ions, they must be called out accordingly thus: F^-, Cl^-, Mg⁺², and Al⁺³. You do not give the H₃PO₄ concentration and your notation is ambiguous. Therefore, we cannot provide you with any kind of answer; you know: "garbage in, garbage out".

If you want to find your own answer, see here:

http://www.coleparmer.com/techinfo/chemcomp.asp

There are a number of publications on Materials of Construction (MOC) and chemical compatibility. The first that comes to mind is:

Perry's Chemical Engineering Handbook

Mike