Process for the removal of heavy metals from acid, phosphate-containing, aqueous media
AssigneeStamicarbon B.V.
InventorsCornelis A. M. Weterings, Johannes A. Janssen
Life of this patent
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Abstract
A process for the removal of heavy metals from an acid phosphate containing, liquid medium in which process a precipitate containing heavy metals is formed and is subsequently separated and wherein at least one of the two additives (a) sulphate ions and (b) calcium ions is added to the phosphate-containing, liquid medium under such conditions that a calcium sulphate anhydride-containing precipitate is formed.
Claims8
A process for the removal of heavy metals from an acid, phosphate-containing, liquid medium, in which process a precipitate containing heavy metals is formed and is subsequently separated, which comprises adding at least one of the following additives (a) sulphate ions and (b) calcium ions to the phosphate-containing, liquid medium under such conditions that a calcium sulphate anhydride-containing precipitate containing heavy metals is formed, wherein the amount of calcium or sulphate ions to be added and the temperature during precipitation are chosen such as to result in conditions corresponding to area II or III of FIG. 1.
Dependencies are inferred from the claim text.