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Machine translation
1. (WO1981000400) ALUMINA PRODUCTION BY NITRIC ACID EXTRACTION OF CLAY
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/000400    International Application No.:    PCT/US1980/000555
Publication Date: 19.02.1981 International Filing Date: 09.05.1980
IPC:
C01F 7/24 (2006.01), F02B 75/02 (2006.01)
Applicants:
Inventors:
Priority Data:
61295 27.07.1979 US
Title (EN) ALUMINA PRODUCTION BY NITRIC ACID EXTRACTION OF CLAY
(FR) PRODUCTION D"ALUMINE PAR EXTRACTION A L"ACIDE NITRIQUE DE L"ARGILE
Abstract: front page image
(EN)A process for the extraction of aluminum values from clay using nitric acid comprising the steps of pelletizing the clay, calcining the pellets at 1100-1550 F in a fluidized bed reactor, extracting the pellets in about 30-40% nitric acid to produce a basic aluminum nitrate solution, purifying said solution by precipitation of iron oxide, filtering the liquor in the presence of a flocculant to remove silicons impurities, crystalizing aluminum nitrate nonahydrate, decomposing the nonahydrate in at least three steps, calcining the residual metallurgical grade alumina and reconstituting to nitric acid the NOX gases produced.
(FR)Un procede d"extraction d"aluminium de l"argile en utilisant de l"acide nitrique consiste a mettre l"argile en forme de boulettes, a calciner les boulettes a 1100-1550 F dans un reacteur a lit fluidise, a soumettre celles-ci a une extraction dans environ 30-40% d"acide nitrique pour produire une solution de nitrate d"aluminium basique, a purifier cette solution par precipitation de l"oxyde de fer, a filtrer la liqueur en presence d"un floculant pour extraire les impuretes de silicium, a cristalliser du nonahydrate de nitrate d"aluminium, a decomposer le nonahydrate en au moins trois etapes, a calciner l"alumine de triage metallurgique, residuelle, et a reconstituer en acide nitrique les gaz NOX produits.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)