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http://dx.doi.org/10.7844/kirr.2017.26.1.51

Separation of Nitric Acid and Gold from Gold Bearing Aqua Regia Solution by Solvent Extraction with TBP(tributyl phosphate)  

Bae, Mooki (Department of Resource Recycling, Korea University of Science and Technology)
Srivastava, Rajiv R. (Department of Resource Recycling, Korea University of Science and Technology)
Kim, Sookyung (Department of Resource Recycling, Korea University of Science and Technology)
Lee, Jae-chun (Department of Resource Recycling, Korea University of Science and Technology)
Publication Information
Resources Recycling / v.26, no.1, 2017 , pp. 51-58 More about this Journal
Abstract
The present study to develop a process for extracting nitric acid and gold from aqua regia leach solution using TBP(tributyl phosphate) was conducted. The pure aqua regia was used to investigate the extractive behavior of nitric acid depending on the concentration of extractant, concentration ratio of nitric and hydrochloric acid. The extraction rate of nitric acid and gold from the gold bearing aqua regia was also examined. The theoretical extraction number was verified by counter current using the number of operations and the phase ratio obtained from McCabe-Thiele diagram. Stripping experiments were carried out for continuous recovery of nitric acid and gold in loaded organic. Considering the effect of extraction acid and gold, the simulation showed that greater than 99.9% extraction of $103.0mg{\cdot}L^{-1}$ gold and 98.0% of $151.2g{\cdot}L^{-1}$ nitric acid could be attained in a two and three-stage counter-current extraction at an O/A phase ratio of 1:0.85. Distilled water and sodium thiosulfate were used as the nitric acid and gold stripping solution. The stripping rates were 99.5% and 92.0%, respectively. The study revealed that the recovery of nitric acid and gold from gold bearing aqua regia was a plausible approach through simultaneous extraction and continuous stripping of nitric acid and gold.
Keywords
Aqua regia; Nitric acid; Gold; TBP; Solvent Extraction;
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Times Cited By KSCI : 1  (Citation Analysis)
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