Alumina production by nitric acid extraction of clay

Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium

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423132, 423DIG16, C01F 724

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active

042462398

ABSTRACT:
Alumina values are extracted from clay by the steps of pelletizing into spherical particles, calcining the pellets in a fluidized bed reactor, extracting the clay in about 30-40% nitric acid, purifying the basic aluminum nitrate produced, crystallizing aluminum nitrate nonahydrate, decomposing the nonahydrate in at least three steps, calcining the produced alumina and reconstituting the NO.sub.x gases to nitric acid.

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