IMPROVEMENTS IN OR RELATING TO A METHOD OF CONTINUOUSLY EXTRACTING BAUXITE

IMPROVEMENTS IN OR RELATING TO A METHOD OF CONTINUOUSLY EXTRACTING BAUXITE

In the continuous extraction of bauxite with sodium aluminate liquor wherein the bauxite is decomposed at a temperature above 180 DEG -200 DEG C, a deposit forms on the walls of the vessel. The deposit, more than 50 percent of which may consist of titanium dioxide, is difficult to remove. It has bee...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: GERHARD WARGALLA, FRITZ KAMPF, GUNTHER WINKHAUS
Format: Patent
Sprache:eng
Schlagworte:
CHEMISTRY
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
INORGANIC CHEMISTRY
METALLURGY
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Beschreibung
Zusammenfassung:In the continuous extraction of bauxite with sodium aluminate liquor wherein the bauxite is decomposed at a temperature above 180 DEG -200 DEG C, a deposit forms on the walls of the vessel. The deposit, more than 50 percent of which may consist of titanium dioxide, is difficult to remove. It has been found that this deposit can be removed by treatment with a mixture of hydrochloric and hydrofluoric acids when moved continuously over the surface of the deposit. It has also been found that the deposit can be removed with high-velocity jets of water, preferably containing a surface-tension reducing agent. Deposits formed at temperatures below 180 DEG -200 DEG C consist principally of sodium aluminum silicate and can be removed with hydrochloric or sulfuric acid.