Adsorbent combinations for enhanced removal of sodium oxalate fr

Details Adsorbent combinations for enhanced removal of sodium oxalate fr Adsorbent combinations for enhanced removal of sodium oxalate fr

1996-06-25

1998-03-17

Straub, Gary P.

Chemistry: physical processes

Physical processes

Crystallization

423121, 423122, 423130, 23300, C01F 736, C01F 708

Patent

active

057281807

ABSTRACT:
Sodium oxalate is precipitated from spent Bayer process liquor by mixture with a low total alkalinity (TA) sodium oxalate seed solution that has been treated with two or more adsorbents to remove organic poisons from the sodium oxalate. The adsorbents are preferably two different adsorbents selected from activated carbon, ESP dust, calcium oxide and magnesium oxide. Surprisingly, combination treatments with activated carbon and ESP dust are most effective even though ESP dust alone has little effect on oxalate removal.

REFERENCES:
patent: 3899571 (1975-08-01), Yamada et al.
patent: 4275042 (1981-06-01), Lever
patent: 4275043 (1981-06-01), Gnyra
patent: 4578255 (1986-03-01), Roe et al.
patent: 5284634 (1994-02-01), Strominger et al.

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