Method for processing aluminum spent potliner in a graphite electrode ARC furnace

Patent · Tue Dec 24 00:00:00 EST 2002

OSTI ID:874961

O'Connor, William K ^[1]; Turner, Paul C ^[2]; Addison, Gerald W ^[3]

---

1. Lebanon, OR
2. Independence, OR
3. St. Stephen, SC

A method of processing spent aluminum pot liner containing carbon, cyanide compositions, fluorides and inorganic oxides. The spent aluminum pot liner is crushed iron oxide is added to form an agglomerated material. The agglomerated material is melted in an electric arc furnace having the electrodes submerged in the molten material to provide a reducing environment during the furnace operation. In the reducing environment, pot liner is oxidized while the iron oxides are reduced to produce iron and a slag substantially free of cyanide compositions and fluorides. An off-gas including carbon oxides and fluorine is treated in an air pollution control system with an afterburner and a scrubber to produce NaF, water and a gas vented to the atmosphere free of cyanide compositions, fluorine and CO.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Assignee: The United States of America as represented by the United States Department (Washington, DC)
• Patent Number(s): US 6498282
• Application Number: 09/596,438
• OSTI ID: 874961
• Country of Publication: United States
• Language: English

Related Subjects

method
processing
aluminum
spent
potliner
graphite
electrode
furnace
pot
liner
containing
carbon
cyanide
compositions
fluorides
inorganic
oxides
crushed
iron
oxide
added
form
agglomerated
material
melted
electric
electrodes
submerged
molten
provide
reducing
environment
operation
oxidized
reduced
produce
slag
substantially
free
off-gas
including
fluorine
treated
air
pollution
control
afterburner
scrubber
naf
water
gas
vented
atmosphere
iron oxide
substantially free
molten material
inorganic oxide
/588/