Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Patent
1986-02-05
1987-01-06
Carter, H. T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
423132, C01F 746
Patent
active
046345817
ABSTRACT:
A process is described for the formation of high purity alumina from Bayer Process alumina trihydrate (gibbsite). The solid hydrated alumina is reacted with concentrated HCl to cause partial or complete conversion to aluminum chloride hexahydrate (ACH). The ACH or mixture of ACH and unreacted hydrated alumina is recovered as a solid and calcined in a single or multistage calcination to high purity alumina. Soda contents in the product anhydrous alumina can be reduced by 98% or greater. Contents of other impurities, such as silica, iron, magnesium, etc., are also markedly reduced. Different degrees of impurity reduction can be obtained by controlling the degree of conversion of the hydrated alumina to ACH and by recycling and treating the acid after solid/liquid separation. The purified products find use in the specialty ceramics field, as catalyst supports, as adsorbents, in electronic components, in prosthetic devices or other applications in which alumina of controlled degrees of purity offers an advantage.
REFERENCES:
patent: 1519880 (1924-12-01), Speckter et al.
patent: 4056363 (1977-11-01), Messner
patent: 4222989 (1980-09-01), Belsky et al.
patent: 4239735 (1980-12-01), Eisele et al.
patent: 4297327 (1981-10-01), Gjelsvik et al.
patent: 4465659 (1984-08-01), Cambridge et al.
Blake Daniel M.
Cambridge Edward L.
Loutfy Raouf O.
Withers James C.
Atlantic Richfield Company
Carter H. T.
Larson Craig E.
LandOfFree
Production of high purity alumina does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Production of high purity alumina, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Production of high purity alumina will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-683267