Recovery Of gold from electronic waste by iodine-iodide leaching

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creativework.keywordsGold, Iodine-iodide lixiviantsolution, Leaching, Precipitation
creativework.publisherUniversity of Chemical Technology and Metallurgyjournal@uctm.eduen
dc.contributor.authorLucheva B.
dc.contributor.authorIliev P.
dc.contributor.authorKolev D.
dc.date.accessioned2024-07-16T11:16:48Z
dc.date.accessioned2024-07-16T11:18:28Z
dc.date.available2024-07-16T11:16:48Z
dc.date.available2024-07-16T11:18:28Z
dc.date.issued2017-01-01
dc.description.abstractGold recovery by iodine-iodide solution is an effective and environment-friendly method. The aim of this research is to investigate the possibility of iodine-iodide gold recovery from gold-plated metal, which is a waste product of the electronic industry. Leaching experiments were carried out in solutions, containing 25 g l-1 iodine and 100 g l-1 KI, under room temperature, rotating speed of 500 rpm and mass ratio of 1:10. The degree of gold recovery for 1 minute leaching was 97,55 %. The concentrations of copper and nickel in the solution were about 0.05 g l-1, while the iron concentration was equal to that of the gold. It had been found that when gold concentration in the solution reached 1 g l-1, the iodine concentration decreased with 20 %. The optimal parameters of reducing dissolved gold iodide salts to gold metal are determined as 20 g KOH and 4 ml 10 % N2H4.H2O per one liter of the solution. Simultaneously with gold, iron and nickel almost completely precipitated (90 %), while the copper precipitation degree was around 25 %, because a large part of it precipitated as CuI during the leaching. The gold was separated from the precipitate by HNO3 treatment.The overall gold recovery is 94,56 %. Experiments were conducted to regenerate the solution by decreasing pH with H2SO4 and by adding of H2O2, as an oxidizing agent. The achieved regeneration degree was 80 %. The main disadvantage of iodine-iodide leaching is the great consumption of reagents and the need for a significant number of filtrations.
dc.identifier.issn1314-7978
dc.identifier.issn1314-7471
dc.identifier.scopusSCOPUS_ID:85014117572en
dc.identifier.urihttps://rlib.uctm.edu/handle/123456789/1174
dc.language.isoen
dc.source.urihttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85014117572&origin=inward
dc.titleRecovery Of gold from electronic waste by iodine-iodide leaching
dc.typeArticle
oaire.citation.issue2
oaire.citation.volume52
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