Alcoa Inc.

Alcoa USA Corp.

Xiangwen Wang

Gary P Tarcy

Robert B Hosler

Jay N Bruggeman

Ron D Barclay

Eliezer Batista

Robert Hosler

Alton T Tabereaux

Jerry L Roddy

Jayson Tessier

Alain J Belda

Patrick J O'Connor

Patrick J O'connor

Stephen J Lindsay

System, method and apparatus for measuring electrolysis cell operating conditions and communicating the same are disclosed. The system includes a selectively positionable member coupled to an analytical apparatus, wherein the selectively positionable is configured to move the analytical apparatus into and out of physical communication with a bath. The system may also include a crust breaker for breaking the surface of a bath and an electronic device for measuring bath level.

System, method and apparatus for measuring electrolysis cell operating conditions and communicating the same

Systems, methods and apparatus relating to evaluation of alumina feedstocks are disclosed. A system may include an alumina storage unit comprising an alumina feedstock, an alumina supply member in communication with the alumina storage unit and an aluminum electrolysis cell. The alumina feedstock of the alumina storage unit may periodically flow through the alumina supply member and to the aluminum electrolysis cell. A measurement device may be in communication with the alumina supply member, and may be configured to measure a supply member property and transmit a first signal to a processor. The processor may be configured to receive the first signal and produce supply member property data based, at least in part, on the first signal.

Systems and methods for determining alumina properties

Systems, methods and apparatus for reducing impurities in electrolysis cells are disclosed. In one approach, a method includes feeding a particulate fines feed stream to a tank, mixing particulate fines (PF) with liquid, the liquid having a first liquid and a second liquid, and separating at least some of the first liquid from at least some of the second liquid. The particulate fines (PF) may include inlet carbon fines (CF) and inlet recyclable fines (RF). The first liquid may include a recovered recyclable fines portion (RF), and the second liquid may include a waste carbon fines portion (CF). The mass ratio of the recovered recyclable fines portion (RF) to the inlet recyclable fines (RF) may be at least about 0.5. The mass ratio of the waste carbon fines portion (CF) to the inlet carbon fines (CF) may be at least about 0.1.

Systems, method and apparatus for reducing impurities in electrolysis cells

System and method for measuring alumina qualities and communicating the same are disclosed. In one example, a system includes an aluminum electrolysis cell, a feeder configured to supply a feed stock using a feed stream to the aluminum electrolysis cell, and a measurement device in communication with the feed stream, the measurement device adaptable to receive, release, and determine at least one attribute associated with the feed stock.

System and method for measuring alumina qualities and communicating the same

An electrolysis cell () contains a number of carbon anodes () having top, bottom and side surfaces, operating in molten electrolyte () in an aluminum electrolysis cell (), where gas bubbles () are generated at the anode surfaces and where alumina particles () are added to the top of the molten electrolyte, where the carbon anodes () have at least two inward slots () passing through the carbon anode () along the longitudinal axisof the carbon anode and also passing through only one front surface () of the carbon anode, where the height () of the slots () is from about 45% to 80% of the anodes thickness and the slotted front surfaces () are disposed toward the center of the electrolysis cell so that generated gas bubbles () are directed to the alumina particles.

Method for electrolytically producing aluminum using closed end slotted carbon anodes

An electrolysis cell () contains a number of carbon anodes () having top, bottom and side surfaces, operating in molten electrolyte () in an aluminum electrolysis cell (), where gas bubbles () are generated at the anode surfaces and where alumina particles () are added to the top of the molten electrolyte, where the carbon anodes () have one inward slot () passing through the carbon anode () along the longitudinal axisof the carbon anode and also passing through only one front surface () of the carbon anode, where the height () of the slot () is from about 45% to 80% of the anodes thickness and the slotted front surfaces () are disposed toward the center of the electrolysis cell so that generated gas bubbles () are directed to the alumina particles.

Closed end slotted carbon anodes for aluminum electrolysis cells

A self-baking, Soderberg type carbon anode () for use in an aluminum electrolyses cell () to form product aluminum (), where the anode () is consumable in molten electrolyte () in the cell, the anode having top, bottom and side surfaces and at least four layers of vertically disposed plate inserts () meltable in the molten electrolyte, the plate inserts () preferably made of aluminum and are capable of melting to create hollow vertical slots () at the bottom of the anode facilitating any gas bubbles () generated to channel to the side of the anode into the electrolyte ().

Method for reducing cell voltage and increasing cell stability by in-situ formation of slots in a Soderberg anode

A method and apparatus for accurately measuring superheat, bath ratio and alumina concentration in an aluminum smelting bath. In one embodiment, a reusable probe determines the bath temperature and bath sample superheat. In other embodiments, the probe also determines bath composition including bath cryolite ratio and alumina concentration.

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Export, PA, United States of America

Xiangwen Wang