Chromiun extraction with organic solvents. Part 3. Application to the treatment of polymetallic industrial residues
DOI:
https://doi.org/10.3989/revmetalm.1998.v34.i5.806Keywords:
Solvent extraction, Chromium, Polymetallic residues, Waste treatmentAbstract
The use of Primene 81R as extraction agent of chromium present in solid wastes containing nickel, iron and copper has been studied. The waste was leached with a sulphuric acid solution up to pH 3 and oxidation of Cr(III) to Cr(VI) with Caro acid was also studied. Because of the negative result of oxidation, the treatment was applied on Cr(III) directly. Extraction/scrubbing/stripping process was studied in the leach. The composition of organic phase used in the extraction step was 10 % v/v Primene 81R, 10 % isodecanol and kerosene. All the iron, 91 % Cr, 10 % Ni and large part of the copper contained in the initial leach solution are recovered in the organic phase. In the scrubbing stage (with a sulphuric acid solution at pH 1,4), all the copper and nickel and 30 % Cr go to the washing liquor, while all the iron and 70 % Cr remained in the organic phase. In the stripping stage (with a 2N NH4OH or 2N NaOH solution) all the iron and chromium are recovered as a precipitate of highly absorbent hydroxides. After the treatment mentioned, 63 % Cr and 100 % Fe are recovered as a mixture of hydroxides, and 28 % of the initial chromium, all the nickel and the copper are found in the washing liquor.
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Published
1998-10-30
How to Cite
de Juan, D., Meseguer, V., & Lozano, L. J. (1998). Chromiun extraction with organic solvents. Part 3. Application to the treatment of polymetallic industrial residues. Revista De Metalurgia, 34(5), 391–398. https://doi.org/10.3989/revmetalm.1998.v34.i5.806
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