Method for the removal of impurities from sodium aluminate solut

Details Method for the removal of impurities from sodium aluminate solut Method for the removal of impurities from sodium aluminate solut

1979-12-13

1981-04-21

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423130, 423600, 423127, 23301, C01F 706

Patent

active

042632617

ABSTRACT:
Impurities such as organic substances, i.e. sodium oxalate and inorganic impurities, i.e. sodium salts of vanadium and phosphorus or double salts containing the latter sodium salts are removed from a sodium aluminate solution in the production of alumina from bauxite according to the Bayer process by adding sodium oxalate crystals or both sodium oxalate crystals and at least one of sodium salts of vanadium and phosphorus, or double salts containing the latter sodium salts as seed to the sodium aluminate solution in the course of after the precipitation step of aluminum hydroxide to before the digestion step, thereby precipitating crystals of said impurities, separating the crystals of said impurities from the sodium aluminate solution, dissolving about 10 to 50% by weight of the amount of the newly precipitated organic substances from the separated crystals of said impurities in an aqueous unsaturated sodium oxalate solution, and recyclically using the crystals resulting from the dissolution together with the resulting solution as seed for the precipitation of the impurities in the sodium aluminate solution. The impurities can be simply and effectively removed.

REFERENCES:
patent: 3649185 (1972-03-01), Sato et al.
patent: 3899571 (1975-08-01), Yamada et al.

Affiliated with

Also associated with

Rating

Method for the removal of impurities from sodium aluminate solut does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for the removal of impurities from sodium aluminate solut, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for the removal of impurities from sodium aluminate solut will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-557547