Journal article

From trace to pure: Recovery of scandium from the waste acid of titanium pigment production by solvent extraction

H Qiu, M Wang, Y Xie, J Song, T Huang, XM Li, T He

Process Safety and Environmental Protection | Published : 2019

Abstract

The waste acid from the titanium pigment production process contains scandium ion at low concentration. The waste is thus an extra resource for scandium. To recover the trace scandium from the waste acid, a process combining pre-enrichment and purification steps via solvent extraction using the extractant of bis-(2-ethylhexyl) phosphoric acid was reported. In the pre-enrichment step, to obtain high extraction efficiency at low extractant consumption, the volume fraction of bis-(2-ethylhexyl) phosphoric (as extractant), tributyl phosphate (as synergistic agent) and the ratio of aqueous-to-organic extractant (A/O) were optimized. Afterwards, to remove the main impurities from the enriched liqu..

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