1. Recovery of chromium from vanadium precipitated solution by precipitation with lead salt and leaching with sodium carbonate.
- Author
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Yang, Minge, Wang, Xuewen, Meng, Yuqi, and Wang, Mingyu
- Subjects
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SODIUM carbonate , *VANADIUM , *CHROMIUM , *SODIUM salts , *CHROMIUM ions , *BALL mills , *CHROMITE , *VANADATES - Abstract
The recovery of chromium from vanadium precipitated solution obtained by adding Ca(OH) 2 into the chromium-containing vanadate solution and ball milling was investigated by precipitation with lead salt and leaching with sodium carbonate. It has been found that chromium can be effectively enriched by adding PbCO 3. The precipitate is the mixture of PbCO 3 and PbCrO 4 ∙PbO. The concentration of Cr residue in the solution can be decreased to 16.0 mg/L by adding PbCO 3 into vanadium precipitated solution according to Pb/Cr molar ratio 4.0 and adjusting the pH to 12.5 with NaOH stirring for 180 min at 20 °C. Then the precipitates were leached with hot Na 2 CO 3 solution under pH 10.0 at 50 °C to obtain the leach solution containing Na 2 CrO 4 and the leach residue containing PbCO 3. After filtration, the leach residue was reused in Cr precipitation and the leach solution was used to circularly leach the Cr precipitate until Na 2 CrO 4 near saturation. Finally, the product of Na 2 CrO 4 ∙4H 2 O with purity 99.3% was obtained by evaporation and crystallization of the leach solution. • Pb(II) was used as the precipitator of Cr in chromate solution. • The Cr concentration decreased from 2.36 g/L to 0.016 g/L with PbCO 3. • Pb(II) and Cr(VI) in the precipitate can be separated by leaching with Na 2 CO 3. • The leach residue and solution can be reused in Cr precipitation and leaching. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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