Process for the removal of salts from aluminum dross

Details Process for the removal of salts from aluminum dross Process for the removal of salts from aluminum dross

C - Chemistry, Metallurgy

22

B

C22B 21/06 (2006.01) C22B 3/04 (2006.01) C22B 7/00 (2006.01) C22B 21/00 (2006.01)

Patent

CA 2120024

2120024 9306254 PCTABS00021 A process is disclosed for treating salt-containing aluminum dross to remove potassium and sodium chloride salts therefrom. The process generally comprises treating the dross in a first treating step with a leaching solution having a pH maintained in the range of about 6-7 to remove a portion of the salt content thereof; filtering the residual solids from the first leaching solution; and treating the filtered solids in a second treating step with a second leaching solution having a pH maintained above about 8, and preferably above about 9. The pH of the first leaching solution is maintained in the desired range by the addition of hydrochloric acid, and the pH of the second leaching solution is maintained in the desired range by the addition of potassium and/or sodium hydroxide.

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