Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
권호 표지
DOI QR코드

DOI QR Code

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

금이 함유된 왕수용액으로부터 TBP(tributyl phosphate) 용매추출에 의한 질산과 금의 분리

  • 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)
  • 배무기 (과학기술연합대학원대학교 자원순환공학) ;
  • ;
  • 김수경 (과학기술연합대학원대학교 자원순환공학) ;
  • 이재천 (과학기술연합대학원대학교 자원순환공학)
  • Received : 2016.12.13
  • Accepted : 2017.01.31
  • Published : 2017.02.28
Download PDF
⟨ Previous Next ⟩

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.

TBP(tributyl phosphate)를 사용하여 왕수 침출액으로부터 질산과 금을 추출하여 회수하는 공정을 개발하기 위한 기초연구가 수행되었다. 순수한 왕수용액으로부터 추출제의 농도, 질산과 염산의 농도 비에 따른 질산의 추출거동을 조사하였으며, 금을 함유하는 왕수용액으로부터 질산과 금의 추출율을 구하였다. McCabe-Thiele 도로부터 얻어진 조업단수와 상비로 역류추출을 행하여 이론적인 추출단수를 검증하였다. 유기상에 장진된 질산과 금의 연속적인 회수를 위한 탈거실험을 수행하였다. 질산과 금의 추출과 염산의 영향을 고려하여 O/A = 1:0.85의 조건으로 역류추출을 통해 2단에 의해 $103.0mg{\cdot}L^{-1}$의 금은 99.9% 추출되었으며, 3단에 의해 $151.2g{\cdot}L^{-1}$의 질산은 98.0% 추출되었다. 질산과 금의 탈거제로는 증류수와 티오황산나트륨이 사용되었으며 탈거율은 각각 99.5%, 92.0%이었다. 이와 같은 연구결과로 왕수용액에 함유되어 있던 금과 질산을 동시에 추출하고 연속적인 탈거공정에 의해서 질산과 금을 회수하는 것이 가능함을 확인하였다.

Keywords

References

  1. Lee, J. C. and Rajiv, R. S., 2016 : The recovery of gold from secondary sources, pp. 7-56, Imperial College Press.
  2. Nghiem, V. N. et al., 2010 : Adsorption of gold(III) from waste rinse water of semiconductor manufacturing industries using Amberlire XAD-7HP resin, Gold Bulletin, 43(3), pp. 200-208. https://doi.org/10.1007/BF03214987
  3. Kim, B. S., 2005 : Process development for recycling valuable metals from obsolete electric and electronic scrap, Recycling Featured Article, 18(4), pp. 21-29.
  4. Marsden, J. O. and House, C. I. 2006 : The Chemistry of Gold Extraction, Society for Mining, Metallurgy, and Exploration, Inc., Littleton, CO, USA, p. 14.
  5. Roland Loewen, 1980 : The worshipful company of goldsmiths; Small scale gold refining, ISSN: 0140 0541.
  6. Oliver A. Short Wilmington, Delaware, 1970 : Milling process for preparing flake gold, United States Patent, No. 3,539,114.
  7. James B. Brug, Eric X. Heidelberg, 1974 : Recovery of gold from solution in aqua regia, United States Patent, No. 3,856,507.
  8. Wei, K. W. and Lung, T., et al., 1981 : Hydrometallurgical process for recovering precious metals from anode slime, United States Patent, No. 4,293,332.
  9. Kim, J. H. and Lee, W. H., 1995 : Solvent extraction of gold by tributyl phosphate in HCl solution, J. of Korean Inst. of Resources Recycling, 32(5), pp. 363-370.
  10. Jung, B. H., Park, Y. Y., et al., 2009 : Processing of high purity gold from scraps using diethylene glycol di-N-butyl ether(dibutyl carbitol), Hydrometallurgy, 95, pp. 262-266. https://doi.org/10.1016/j.hydromet.2008.06.006
  11. Seoul Metropolitan Area Air Quality Report. 2014 : Metropolitan Air Quality Management Office. Retrieved June 14, 2016 from http://www.me.go.kr/mamo/web/index.do?menuId=587
  12. Ahn, J. W., 1998 : A study on the recovery of nitric acid from spent nitric etching solutions by solvent extraction, J. of Korean Inst. of Resources Recycling, 7(5), pp. 46-51.
  13. Ahn, J. W., Ahn, J. G., and Lee, M. S., 2002 : Recovery of nitric acid and valuable metals from spent nitric etching solutions of printed circuit board, J. of Korean Inst. of Metals & Materials, 40(1), pp. 116-121.
  14. Shin, C. H., Kim, J. Y., et al., 2009 : Recovery of nitric acid from waste etching solution using solvent extraction, Journal of Hazardous Materials, 163, pp. 729-734. https://doi.org/10.1016/j.jhazmat.2008.07.019
  15. Ha, Y. H., Gang, R. J., et al., 2013 : Recovery of nitric acid and copper from plating waste of automonile wheel, Journal of the Korea Academia-Industrial cooperation Society, 14(11), pp. 6015-6022. https://doi.org/10.5762/KAIS.2013.14.11.6015
  16. Skoog, D. A., West, D. M., and Holler, F. J., 1996 : Fundamentals of Analytical Chemistry, 7th Edition, Thomson Learning, Inc, USA.
  17. Sheen, R. T. and Kahler, H. L., 1938 : Effects of Ions on Mohr Method for Chloride Determination, Ind. Eng. Chem. Anal. Ed., 10(11), pp. 628-629. https://doi.org/10.1021/ac50127a004
  18. Kraemer, E. O. and Stamm, A. J., 1924 : Mohr's Method for the Determination of Silver and Halogens in other than Neutral Solutions, J. Am. Chem. Soc., 46(12), pp. 2707-2709. https://doi.org/10.1021/ja01677a014
  19. Lee, J. C. et al., 2015 : Separation of Nitric Acid and Gold from Aqua regia Leach Solution by TBP, J. of Korean Inst. of Resources Recycling, Digests of the 2015 spring meeting and 44th conference, p. 10.