Systems and methods for purifying aluminum

Patent metadata

Field	Value
Publication number	US-11001931-B2
Application number	US-201916547454-A
Country	US
Kind code	B2
Filing date	Aug 21, 2019
Priority date	Feb 11, 2015
Publication date	May 11, 2021
Grant date	May 11, 2021

Abstract

The application is directed towards methods for purifying an aluminum feedstock material. A method provides: (a) feeding an aluminum feedstock into a cell (b) directing an electric current into an anode through an electrolyte and into a cathode, wherein the anode comprises an elongate vertical anode, and wherein the cathode comprises an elongate vertical cathode, wherein the anode and cathode are configured to extend into the electrolyte zone, such that within the electrolyte zone the anode and cathode are configured with an anode-cathode overlap and an anode-cathode distance; and producing some purified aluminum product from the aluminum feedstock.

First claim

What is claimed is:

1. An aluminum electrolysis cell comprising:
(a) a base;
(b) a bottom located proximal the base, wherein the bottom comprises an upper surface and a lower surface, wherein the upper surface of the bottom comprises a slope;
(c) an anode connector in electrical communication with the lower surface of the bottom, wherein the anode connector comprises an outer end configured to connect to an external power source;
(d) at least one an elongate vertical anode extending upward from the upper surface of the bottom;
(e) a cathode connector proximal a top cover, wherein the cathode connector has an upper connection rod and a lower surface, wherein the upper connection rod is configured to connect to the external power source;
(f) at least one elongate vertical cathode extending downward from the lower surface of the cathode connector, wherein at least some of the elongate vertical cathodes overlap with the elongate vertical anodes such that distal ends of the elongate vertical cathodes are proximal middle portions of corresponding elongate vertical anodes;
(g) a plurality of sidewalls located above the bottom;
(h) an aluminum metal extraction port penetrating at least one of the sidewalls, wherein the aluminum metal extraction port is located above distal ends of the plurality of elongate vertical anodes.

2. The aluminum electrolysis cell of claim 1 , wherein the sidewalls, the top cover and the bottom define a cell chamber.

3. The aluminum electrolysis cell of claim 2 , comprising a cell access channel penetrating the cell chamber, wherein the cell access channel comprises an access port.

4. The aluminum electrolysis cell of claim 2 , comprising an inert gas inlet in the top cover, wherein the inert gas inlet is configured to provide an inert atmosphere to the cell chamber.

5. The aluminum electrolysis cell of claim 1 , wherein the slope comprises an angle of less than 10 degrees.

6. The aluminum electrolysis cell of claim 5 , wherein the slope comprises and angle of from 3 to 5 degrees.

Assignees

• Alcoa Usa Corp

Inventors

• Deyoung David H
• Liu Xinghua
• Mydland Brent L
• Wiswall James

Classifications

• C25C3/16

  Electric current supply devices, e.g. bus bars · CPC title

• C25C3/08 Primary

  Cell construction, e.g. bottoms, walls, cathodes · CPC title

• C25C3/24 Primary

  Refining · CPC title

• C25C3/12

  Anodes · CPC title

• B22D21/007

  with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C · CPC title