Other

Martin Marietta Aluminum Inc.

Commonwealth Aluminum Corporation

John A Green

Larry G Boxall

Bernard W Gamson

Sergio A Loynaz

Stephen C Traugott

A tank for liquidous material is disclosed having a single aperture for accessing an interior volume. A collar formed as a truncated cone circumscribes the aperture to provide sealing with a cap having a mating conical band. A band surface and a collar surface form the only contact between the cap and the collar. A drain fitting may be secured to the collar upon removal of the cap, after which the tank is upended for draining through the drain fitting. A wash fitting attached to the drain fitting sprays the interior of the tank for cleaning. No recesses (grooves) or `O` ring seals, and no protruding, resilient, normal, face seals are used which might trap debris and inhibit complete cleaning. The tapered collar and band create contact forces for sealing that are much greater than the load securing the cap to the collar. The tank, collar and cap may be rotomolded of a single material in a single mold, the cap being severed and trimmed after molding. The tank is suitable for a holding tank of a portable toilet, and supports a removable seat. The tank is resistant to puncture for a 'kick bucket' or 'sharps' container for hospitals, and may be easily cleaned or sterilized.

Holding tank for waste

In an electrolytic cell for the production of aluminum from alumina, having an anode-to-cathode gap of from 1 to 5 cm, the flow of electrolyte through the interelectrode gap is induced by positioning the cathode at an inclination of from about 2 to about 15 degrees from the horizontal, and operating at an anode current density of from about 0.5 to about 3.0 A/cm.sup.2. The cathode surface is a Refractory Hard Material which is wetted by aluminum.

Low energy aluminum reduction cell with induced bath flow

Sufficient anionic polyacrylamide having molecular weight of at least 2,800,000 is contacted with alkali metal aluminate liquor containing ferrous iron until a substantial proportion of the ferrous iron is precipitated, and said precipitate and liquor are separated. The process is particularly useful as an improvement in the Bayer process for preparing alumina from bauxite.

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Ellicott City, MD, United States of America

John A Green