Recovery of Silver from the Nitrate Leaching Solution of the Spent Ag/ alpha -Al sub(2)O sub(3) Catalyst by Solvent Extraction

Silver is recovered from the leaching solution of the spent Ag/ alpha -Al sub(2)O sub(3) catalyst by solvent extraction. Most of the silver in the spent catalyst was dissolved by using HNO sub(3) solution. The parameters such as concentration of lixiviant, reaction temperature, pulp density, and sti...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2014-12, Vol.53 (52), p.20241-20246
Main Authors: Sun, Pan-Pan, Song, Hyoung-Il, Kim, Tae-Young, Min, Byoung-Jun, Cho, Sung-Yong
Format: Article
Language:English
Subjects:
Catalysts
Density
Dissolution
Leaching
Recovery
Silver
Solvent extraction
Stripping
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Summary:Silver is recovered from the leaching solution of the spent Ag/ alpha -Al sub(2)O sub(3) catalyst by solvent extraction. Most of the silver in the spent catalyst was dissolved by using HNO sub(3) solution. The parameters such as concentration of lixiviant, reaction temperature, pulp density, and stirring speed, which might affect the dissolution of silver from the spent catalyst, were investigated. McCabe-Thiele plots predicted that complete extraction of Ag from the leaching solution could be obtained with LIX63 at an O/A ratio of 1 in 3 stages, while complete stripping of Ag from the loaded LIX63 could be obtained with thiourea at an A/O ratio of 1 in 2 stages. Countercurrent extraction and stripping simulation tests were carried out to confirm this prediction. More than 99.89% of Ag with purity of 99.91% was recovered from the leaching solution. Finally, a complete flow sheet of the process for separation and recovery of Ag from the spent catalyst was demonstrated.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie5041918