Immobilization of metal contaminants from a liquid to a solid medium
AssigneeAlbright & Wilson Limited
InventorsMichael L. James, Mark A. Rose
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Abstract
A method for the immobilization of heavy metal contaminant from a liquid medium containing sulfuric acid and one or more acids of phosphorus, for example in the treatment of acid raffinates generated during the purification of phosphoric acid. The method includes the steps of (i) neutralizing the liquid medium with a stoichiometric excess of an alkaline earth metal oxide to form agglomerates, and (ii) treating the agglomerates with water to form a solid cementitious material wherein the heavy metal contaminants are substantially chemically isolated.
Claims14
A method, for the immobilization of heavy metal contaminants from a sulfuric acid-rich liquid medium comprising one or more acids of phosphorus, said method comprising the following steps:
- (a) neutralizing said liquid medium with a stoichiometric excess of an alkaline earth metal oxide, whereby agglomerates of said liquid medium and said oxide are formed;
- and
- (b) adding sufficient water to said agglomerates to form a solid cementitious material wherein said heavy metal contaminants are substantially chemically isolated.
Dependencies are inferred from the claim text.