uhhh, where does the phosphate go? does it evaporate?
If It were one of the aluminum hydroxide compds, heating it only dries it out, as the hydroxide has been exchanged for phosphate and the aluminum phosphate is quite stable at 350F
Ferric hydroxide also exchanges phosphate for hydroxide, and ferrous phosphate is also fairly stable at 350, although the oxidative state of the iron may change during heating so that a multitude of differing morphs of ferrous/ferric phosphate salts may appear, you'd still basically end up with phosphate salts of iron.
Pretty stable at 350 F, although any remaining Fe hydroxide may be converted to ferric oxide (rust), basically inactivating the resin as a
phosphate sponge at that point in seawater.
Any organic phosphates that are adhered/adsorbed to the surface of these granules might be decomposed by this heat, but it will still leave behind some form of a phosphate salt that is basically stable at these temps.
Where did the LFS person get the info? A reference would be nice. There are ways to have the phospate elutriated off the resins, but it will not be in an oven, and the cost is most often more than the replacement costs of the original
phosphate remover substance.
just m2cw
