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Solubility and Phase Behavior of Cr(III) Oxides in Alkaline Media at Elevated Temperatures

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Abstract

A platinum-lined, flowing autoclave facility is used to investigate the solubility behavior of Cr2O3 and FeCr2O4 in alkaline sodium phosphate, sodium hydroxide, and ammonium hydroxide solutions between 21 and 288°C. Baseline Cr(III) ion solubilities were found to be on the order of 0.1 nmolal, which were enhanced by the formation of anionic hydroxo and phosphato complexes. At temperatures below 51°C, the activity of Cr(III) ions in aqueous solution is controlled by a Cr(OH)3·3H2O solid phase rather than Cr2O3; above 51°C the saturating solid phase is γ-CrOOH. Measured chromium solubilities were interpreted via a Cr(III) ion hydrolysis/complexing model and thermodynamic functions for the hydrolysis/complexing reaction equilibria were obtained from least-squares analyses of the data. The existence of four new Cr(III) ion complexes is reported: Cr(OH)3(H2PO4)−, Cr(OH)3(HPO4)2−, Cr(OH)3(PO4)3−, and Cr(OH)4(HPO4)-(H2PO4)4−. The last species is the dominant Cr(III) ion complex in concentrated, alkaline phosphate solutions at elevated temperatures.

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  1. Lockheed Martin Corporation, P.O. Box 1072, Schenectady, New York

    S. E. Ziemniak, M. E. Jones & K. E. S. Combs

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  1. S. E. Ziemniak
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Ziemniak, S.E., Jones, M.E. & Combs, K.E.S. Solubility and Phase Behavior of Cr(III) Oxides in Alkaline Media at Elevated Temperatures. Journal of Solution Chemistry 27, 33–66 (1998). https://doi.org/10.1023/A:1022688528380

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