Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Patent
1979-09-06
1980-12-16
Carter, Herbert T.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
423132, C01F 722
Patent
active
042397359
ABSTRACT:
A method for producing substantially pure alumina from kaolin clay by removing in a soluble form impurities which contaminate the alumina while the aluminum is maintained in an insoluble form. This is accomplished by leaching calcined kaolin clay with at least 36 weight percent hydrochloric acid to dissolve the impurities and convert the aluminum to insoluble aluminum chloride and maintaining the hydrochloric acid concentration in the leach liquor at at least 36 weight percent by the injection of hydrochloric acid gas. The insoluble aluminum chloride is then separated from the dissolved impurities and subjected to a second leaching step to solubilize and separate it from the silica gangue. Substantially pure AlCl.sub.3.sup.. 6H.sub.2 O crystals are recovered from solution and converted to alumina by conventional means. In an alternate embodiment, the process may be practiced on uncalcined clay and includes the addition of a source of fluoride ions, such as H.sub.2 SiF.sub.6, to the at least 36 weight percent hydrochloric acid leach liquor. An optional preleaching step utilizing 2N to 6N mineral acid is also disclosed.
REFERENCES:
patent: 558725 (1896-04-01), Gooch
patent: 1490021 (1924-04-01), Pedemonte
patent: 1777570 (1930-10-01), Masin
patent: 1798261 (1931-03-01), Hoisfield
patent: 2413709 (1947-01-01), Hoffman
patent: 3816605 (1974-06-01), Belsky
Bauer Donald J.
Bremner Paul R.
Eisele Judith A.
Brown William S.
Carter Herbert T.
Gardiner Donald A.
The United States of America as represented by the Secretary of
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