January 2022
Volume 74    Issue 1

Influence of amino and organic acid structure on the extraction of gold from silicate ore

Kudpeng, Kanjana; Thiravetyan, Paitip


The aim of this study is to compare amino acids and organic acids in the extraction of gold from silicate ore. Amino acids were found to have higher efficiency of gold extraction than organic acids at the same acid concentration, which is likely due to amino acids having both carboxylic and amine groups in their structure, while organic acids only have carboxylic groups. Five amino acids (glycine, aspartic acid, glutamic acid, lysine and tryptophan) and seven organic acids (citric, malic, tataric, fumaric, oxalic, succinic and ascorbic acids) were selected to investigate gold extraction efficiency. Aspartic acid was found to have greater capacity to extract gold than succinic acid. The optimal gold to aspartic acid molar ratio was 1:6, and low concentrations of aspartic acid extracted 35 to 42 percent of gold from silicate ore within 15 days. Further studies are needed to increase gold leaching and reduce incubation time. The results imply that aspartic acid can be used as an alternative reagent to traditional methods for extracting gold from ore. This method is nontoxic to humans, is environmentally friendly and can have real applications.

Full-text paper:
Mining, Metallurgy & Exploration (2021) 38:2185–2194, https://doi.org/10.1007/s42461-021-00460-5


Follow these easy steps if you are an SME member:
  • Go to www.smenet.org/login . Sign in with your email address and password.
  • Hover your mouse over “Publications and Resourcesâ€� in the top banner. Click on “Mining, Metallurgy & Exploration (MME) Journalâ€� in the pull-down menu.
  • Scroll down and click on the “Read the MME Journal Onlineâ€� button, which will take you to the Springer site as an SME member who is eligible for free access. (To see published papers on the Springer site, click on “Browse Volumes & Issuesâ€� in the blue banner.)
If you are not an SME member, go to https://www.springer.com/engineering/journal/42461 for paid access. Or join SME at www.smenet.org/join