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- W294481497 abstract "Additional studies were performed on model spent acid solutions to determine the effects of time, temperature, and pH on yields of natrojarosite (NaFe/sub 3/(SO/sub 4/)/sub 2/(OH)/sub 6/). The desired pH values (in the range of 1.1 to 2.3) were maintained during the tests by adding either H/sub 2/SO/sub 4/ or CaCO/sub 3/. It was shown that precipitation of jarosite-type compounds can effectively remove Fe and SO/sub 4//sup =/ impurities from model solutions of spent acid. Although the analytical data for Na require further interpretation, it appears that substantial amounts of Na can also be precipitated as natrojarosite. The optimum pH for precipitating natrojarosite appears to be about 1.5. Using Fe/sub 2/O/sub 3/ as a source of ferric iron does not appear to be a satisfactory alternative to using Fe/sub 2/(SO/sub 4/)/sub 3/. If a NaOH/KOH mixture is used in the MCL process, the apparent preferential precipitation of Na/sub 2/CO/sub 3/ rather than K/sub 2/CO/sub 3/ could improve process economics slightly, but it may complicate precipitation of Na as natrojarosite from spent acid streams since the Na jarosite species does not form as readily as the K jarosite. 6 refs., 6 figs., 5 tabs." @default.
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- W294481497 date "1988-05-01" @default.
- W294481497 modified "2023-09-27" @default.
- W294481497 title "Regeneration of alkali in caustic desulfurization systems: Quarterly report, 1 January 1988--31 March 1988" @default.
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