Extraction separation of germanium with hydroxamic acid HGS98

Abstract

The extraction separation of germanium from indium raffinate in hydrometallurgical zinc process was discussed. The conditions and mechanism of the extraction with hydroxamic acid HGS98 have been investigated in detail. The results show that using 2% (mass fraction) hydroxamic acid HGS98 and 5% D₂EHPA as synergist, germanium is extracted (1-stage) over 99% in 5 min at phase ratio (V_o: V_a) of 1:5 from indium raffinate with original acidity. Then, using 2 mol·L⁻¹ NH₄F as strip liquor, the stripping recovery is over 98% in 15 min at phase ratio of 1:1. This process has the following advantages: easy to operate, high recovery and selectivity, and lower investment cost. It provides a new way to recover rare metal — germanium from metallurgical spent residues.

Keywords

extraction / separation / germanium / hydroxamic acid HGS98

References

[1] Cote G, Bauer D. Liquid-liquid extraction of germanium with oxine derivatives[J]. Hyrometallurgy, 1980(5):149–160

[2] Denise R. The method of selective extraction of germanium[J]. Foreign Rare Metal (in Chinese), 1984(1):15–25

[3] De Schepper A, Van Peteghem A. Liquid-liquid extraction of germanium from aqueous solution using hydroxyoximes [P]. U S Patent, 3883634. 1975-08-25

[4] HarbuckD D, JuddJ C, BehuninD V. Germanium solvent extraction from sulfuric acid solutions[J]. Solvent Extraction and Ion Exchange, 1991, 9(3): 383-401

[5] Zhou Lingzhi, Tian Runchang, Zhou Jiangyan. A study on the recovery of indium, germanium and gallium from zinc leaching residue by hydrometallurgical extraction process[J]. Rare Metal(in Chinese), 1981(6):7–14