Extracting metal ions with diphosphonic acid, or derivative ther

Hazardous or toxic waste destruction or containment – Destruction or containment of radioactive waste – Treating radioactive liquid

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423 9, 423 10, 423 11, 423 215, 423 24, 423 42, 423112, 423139, 423140, 423122, 423157, 423158, 423181, 423184, 4236585, C01G 5600, C01G 100

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053325311

ABSTRACT:
Thermodynamically-unstable complexing agents which are diphosphonic acids and diphosphonic acid derivatives (or sulphur containing analogs), like carboxyhydroxymethanediphosphonic acid and vinylidene-1,1-diphosphonic acid, are capable of complexing with metal ions, and especially metal ions in the II, III, IV, V and VI oxidation states, to form stable, water-soluble metal ion complexes in moderately alkaline to highly-acidic media. However, the complexing agents can be decomposed, under mild conditions, into non-organic compounds which, for many purposes are environmentally-nondamaging compounds thereby degrading the complex and releasing the metal ion for disposal or recovery. Uses for such complexing agents as well as methods for their manufacture are also described.

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