Process for the preparation of pure aluminum oxide

Details Process for the preparation of pure aluminum oxide Process for the preparation of pure aluminum oxide

1979-04-24

1980-09-23

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423126, 423132, 423335, C01F 722

Patent

active

042242878

ABSTRACT:
In the process for the preparation of pure aluminum oxide by the steps of hydrochloric acid decomposition of mechanically or thermally activated clay or alumina containing minerals, separating the insoluble residue, removing the iron from the solution, crystallizing the aluminum chloride in the iron-free solution, thermally decomposing the crystallizate to aluminum oxide and recovering the hydrochloric acid from the decomposition gases, the improvement comprising effecting the process by the steps of mechanically pretreating the clay, drying the pretreated clay, thermally or mechanically activating the clay, subjecting the activated clay to circulating leaching, separating the leached material into an SiO.sub.2 containing residue and an AlCl.sub.3 solution, extracting the AlCl.sub.3 solution to an evaporating crystallization and thermally decomposing the crystals to produce .alpha.-Al.sub.2 O.sub.3. All of the stages are interrelated one to the other for maximum recovery of byproducts, heat, acid and the like. The .alpha.-Al.sub.2 O.sub.3 is directly produced in a form of high purity suitable for most applications.

REFERENCES:
patent: 2249761 (1941-07-01), Hixson et al.
patent: 2267490 (1941-12-01), Buche et al.
patent: 2376696 (1945-05-01), Hixson et al.
patent: 2413709 (1947-01-01), Hoffman
Miller et al., "Chemical Absts.", vol. 38, 1940, pp. 1079-1080.

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