Recovery and utilization of gypstack leachate in hemihydrate pho

Details Recovery and utilization of gypstack leachate in hemihydrate pho Recovery and utilization of gypstack leachate in hemihydrate pho

1989-06-22

1992-01-28

Heller, Gregory A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423320, 423321R, C01B 2516

Patent

active

050842617

ABSTRACT:
Disclosed is a process for treating a waste stream containing calcium sulfate by depositing said waste stream on a gypstack, collecting the leachate from the gypstack, and recovering the P.sub.2 O.sub.5 values therefrom. Also disclosed is apparatus comprising means for depositing a waste stream containing calcium sulfate on a gypstack, means for collecting the leachate from the gypstack, and means for recovering the P.sub.2 O.sub.5 values therefrom. Preferably, at least about 25% of the calcium sulfate is calcium sulfate hemihydrate.

REFERENCES:
patent: 3498746 (1970-03-01), Smaltz et al.
patent: 3795728 (1974-03-01), Scheel
patent: 4134964 (1979-01-01), Ehlers et al.
patent: 4557915 (1985-12-01), Nineuil
Article by James R. Lear et al., J. Agr. Foodchem., vol. 14, No. 1, pp. 27-33 (1966) titled "Precipitated Impurities in Wet Process Phosphoric Acid".
Article by M. Mathew et al., in American Minerologist, vol. 66, pp. 392-397 (1981).

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