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Electrogenerative Process For The Recovery Of Gold From Cyanide Solutions And The Formation Of Gold Microstructures On Carbon-Based Matrices

The application of an electrogenerative system as an alternative to the electrochemical recovery of gold from aqueous solutions is presented. This process does not require an external supply of energy due to the spontaneous chemical reaction that takes place in the reactor while generating an extern...

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Main Author: Yap , Chin Yean
Format: Thesis
Language:English
Published: 2010
Subjects:
QD1-999 Chemistry
Online Access:http://eprints.usm.my/43093/1/Yap_Chin_Yean24.pdf
http://eprints.usm.my/43093/
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spelling my.usm.eprints.43093 http://eprints.usm.my/43093/ Electrogenerative Process For The Recovery Of Gold From Cyanide Solutions And The Formation Of Gold Microstructures On Carbon-Based Matrices Yap , Chin Yean QD1-999 Chemistry The application of an electrogenerative system as an alternative to the electrochemical recovery of gold from aqueous solutions is presented. This process does not require an external supply of energy due to the spontaneous chemical reaction that takes place in the reactor while generating an external flow of current as a by-product. Two types of operation modes were investigated. A batch reactor operating in an electrogenerative mode is used in gold recovery from cyanide solutions. In this study, gold cyanide solutions serve as the catholyte because cyanide is the most common leachant used during the extraction of metals in the hydrometallurgical industry. The batch reactor with an improved design using three dimensional cathodes namely porous graphite and reticulated vitreous carbon (RVC) and two dimensional cathode materials, copper and stainless steel plates were coupled with a zinc anode. The system resulted in more than 90% gold being recovered within 3 h of operation. Activated RVC serves as a superior cathode material having the highest recovery rate with more than 99% of gold being recovered in 1 h of operation. An electrogenerative flow-through reactor with an activated RVC cathode was also developed. The reactor proved to be efficient in recovering more than 99% of gold within 4 h of operation. The performance of the reactor was evaluated with initial KAu(CN)2 concentrations of 0.051 mM, 0.508 mM , 2.54 mM and various electrolyte flow rates. Gold recovery was found to be strongly dependent on electrolyte flow rate and initial gold concentration in the cyanide solution under the experimental conditions used. 2010-06 Thesis NonPeerReviewed application/pdf en http://eprints.usm.my/43093/1/Yap_Chin_Yean24.pdf Yap , Chin Yean (2010) Electrogenerative Process For The Recovery Of Gold From Cyanide Solutions And The Formation Of Gold Microstructures On Carbon-Based Matrices. PhD thesis, Universiti Sains Malaysia.
institution Universiti Sains Malaysia
building Hamzah Sendut Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Sains Malaysia
content_source USM Institutional Repository
url_provider http://eprints.usm.my/
language English
topic QD1-999 Chemistry
spellingShingle QD1-999 Chemistry
Yap , Chin Yean
Electrogenerative Process For The Recovery Of Gold From Cyanide Solutions And The Formation Of Gold Microstructures On Carbon-Based Matrices
description The application of an electrogenerative system as an alternative to the electrochemical recovery of gold from aqueous solutions is presented. This process does not require an external supply of energy due to the spontaneous chemical reaction that takes place in the reactor while generating an external flow of current as a by-product. Two types of operation modes were investigated. A batch reactor operating in an electrogenerative mode is used in gold recovery from cyanide solutions. In this study, gold cyanide solutions serve as the catholyte because cyanide is the most common leachant used during the extraction of metals in the hydrometallurgical industry. The batch reactor with an improved design using three dimensional cathodes namely porous graphite and reticulated vitreous carbon (RVC) and two dimensional cathode materials, copper and stainless steel plates were coupled with a zinc anode. The system resulted in more than 90% gold being recovered within 3 h of operation. Activated RVC serves as a superior cathode material having the highest recovery rate with more than 99% of gold being recovered in 1 h of operation. An electrogenerative flow-through reactor with an activated RVC cathode was also developed. The reactor proved to be efficient in recovering more than 99% of gold within 4 h of operation. The performance of the reactor was evaluated with initial KAu(CN)2 concentrations of 0.051 mM, 0.508 mM , 2.54 mM and various electrolyte flow rates. Gold recovery was found to be strongly dependent on electrolyte flow rate and initial gold concentration in the cyanide solution under the experimental conditions used.
format Thesis
author Yap , Chin Yean
author_facet Yap , Chin Yean
author_sort Yap , Chin Yean
title Electrogenerative Process For The Recovery Of Gold From Cyanide Solutions And The Formation Of Gold Microstructures On Carbon-Based Matrices
title_short Electrogenerative Process For The Recovery Of Gold From Cyanide Solutions And The Formation Of Gold Microstructures On Carbon-Based Matrices
title_full Electrogenerative Process For The Recovery Of Gold From Cyanide Solutions And The Formation Of Gold Microstructures On Carbon-Based Matrices
title_fullStr Electrogenerative Process For The Recovery Of Gold From Cyanide Solutions And The Formation Of Gold Microstructures On Carbon-Based Matrices
title_full_unstemmed Electrogenerative Process For The Recovery Of Gold From Cyanide Solutions And The Formation Of Gold Microstructures On Carbon-Based Matrices
title_sort electrogenerative process for the recovery of gold from cyanide solutions and the formation of gold microstructures on carbon-based matrices
publishDate 2010
url http://eprints.usm.my/43093/1/Yap_Chin_Yean24.pdf
http://eprints.usm.my/43093/
_version_ 1643710661202542592
score 13.211869

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