Removal of Iron from Aluminum Nitrate.
Schultze-LE; Bauer-DJ; Eisele-JA
U S Pat 4 032 613 1977 Jun; :
Iron is removed from concentrated aluminum nitrate solution by solvent extraction with tri-n-butyl phosphate (tbp). Thus, a feed consisting of 100 g of al(no3)3.9H2o and 0.85 G of fe(no3)3.9H2o was melted at 70 deg c and extracted at that temperature by contacting with 24 ml of undiluted tbp. The contacting consisted of agitating the molten salt and tbp with a mechanical stirrer. The tbp was separated from the residue decanting it off the cooled, solidified salt, and was stripped by means of contacting with an equal volume of water. Analysis of the residue showed that the extraction reduced the iron content of the feed to less than 0.05 G of fe(no3)3.9H2o.
U.S. Pat. 4,032,613, June 28, 1977; Chem. Abstr. Not Found