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Dense hydrolysis products from iron (III) nitrate and sulfate solutions.
Flynn CM Jr.
Hydrometallurgy 1990 Jan; 25(2):257-270
The U.S. Bureau of Mines studied the hydrolysis of fe(III) in no3- and so2/4- solutions at different temperatures to determine the conditions under which dense fe(III) precipitates form. Solutions of known composition made from reagent chemicals were maintained in controlled-temperature baths, and changes in color and formation of solid phases were observed as a function of time. Solids were isolated and characterized by x-ray powder diffraction or infrared spectroscopy. Dense fe(III) precipitates are obtained in fe(no3)3 solutions especially at temperatures greater than or equal to 60 deg c in acidified solutions. At lower acidities, colloids, a cationic hydrolytic polymer, or gelatinous precipitates form. In so2/4- - containing solutions a dense amorphous basic ferric sulfate (dabfs) of compositions fe4(oh)10 so4.Xh2o (x = 2 to 3) forms at lesser than or equal to 40 deg c from solutions with so2/4- and fe3+ concentrations lesser than or equal to 0.2 M and mole ratio so2/4- /fe(III) greater than or equal to 0.5. Chemical observations showed that dabfs is related to the fe(III) cationic hydrolytic polymer.
C.M. Flynn, Jr., Reno Research Center, Bureau of Mines, U.S. Department of Interior, Reno, Nevada, 89512-2295 (U.S.A.)
OP; Journal Article
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Page last reviewed: September 2, 2020
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