EXTRACTION OF GOLD AND SILVER BY CYANIDATION PROCESS FROM COMPLEX ORE OF SHOUGHUR AREA CHITRAL, KYBER PAKHTUNKHWA

  • Sajjad Hussain Department of Mining Engineering UET Peshawar
  • Nisar Mohammad UET Peshawar
  • Zahid Ur Rehman UET Peshawar
  • Noor Muhammad Khan
  • Ishaq Ahmad
  • Naseer Muhammad Khan
  • Salim Raza UET Peshawar
Keywords: Complex ore, Cyanidation process, parameter optimization

Abstract

The aim of the research work was to optimize the cyanidation leaching parameters for maximum extraction of gold and silver from complex ore of Shoughur area of district Chitral, Khyber Pakhtunkhwa on laboratory scale testing. The research work was carried out into two parts. In first part the cyanidation parameters like grinding time, dosage of pH, cyanidation time, dosage of sodium cyanide (NaCN) and dosage of lime Ca (OH)2  were optimized. The samples were subjected to differential grinding time varying from 20 to 35 minutes, pH of slurry adjusted from 9 to 11 by adding Ca (OH)2 from 0.5 to 1.5 gm/kg  , dosage of NaCN varies from  0.1% to 0.02 % and cyanidation time varies from 0 to 40 hours. The maximum yielded of 71.82 gm/ton of gold grade and silver grade of 34.34 gm/ton was obtained at grinding time of 25 minutes, particle size 63 um, pH 10.40, cyanidation time of 37 hours and at lime dosage of 0.5gm/kg. In the second part the cyanidation process was applied on roasted and un-roasted ore samples. The cyanidation time and grinding time were optimized. The maximum grade of gold 71.82 ppm and silver 25.95 ppm was extracted from roasted ore samples at cyanidation time of 35 hours and grinding time of 30 minutes as compared to unroasted ore samples. It is concluded that cyanidation process on roasted ore samples gives encouraged results as compared to un-roasted ore samples

Author Biographies

Sajjad Hussain, Department of Mining Engineering UET Peshawar

Department of Mining Engineering

UET Peshawar

Nisar Mohammad, UET Peshawar

Assistant Professor

Department of mining engineering

University of engineering and technology, Peshawar, Pakistan

Zahid Ur Rehman, UET Peshawar

Lecturer

Department of mining engineering

University of engineering and technology, Peshawar, Pakistan

 

Noor Muhammad Khan

Professor

Department of mining engineering

University of engineering and technology, Peshawar, Pakistan

 

Ishaq Ahmad

Assistant Professor

Department of mining engineering

University of engineering and technology, Peshawar, Pakistan

 

Naseer Muhammad Khan

Lecturer

Department of mining engineering

BUITEMS Quetta, Pakistan

 

Salim Raza, UET Peshawar

Assistant Professor

Department of mining engineering

University of engineering and technology, Peshawar, Pakistan

 

References

1. Directorate General of Mines and Minerals, 2005"Report on Complex Ore of Awrith/Shoghore area," Mineral Development Department, Khyber Pakhtunkhwa,.
2. A. Akcil, 2002 "First application of cyanidation process in Turkish gold miningand its environmental impacts," Minerals Engineering, vol. 15, pp. 695-699.
3. Kondos, P.D., Deschenes, G., Morrison, R.M, 2009 "Use of ferricyanide for gold and silver cyanidation," Transaction of nonferrous Metals Socity of China , vol. 19, pp. 714-718.
4. L.R.P. de Andrade Lima, D. Hodouin, 2006 "Analysis of the gold recovery profile through a cyanidation plant," International Journal of Mineral Processing, vol. 80, pp. 15-26.
5. G. Senanayake, 2008"A review of effects of silver, lead, sulfide and carbonaceous matteron gold cyanidation and mechanisti c interpretation," Hydrometallurgy, vol. 90, pp. 46-73.
6. S. Ubaldini, F. Vegli, L. Toro , C. Abbruzzese, 1997 "Biooxidation of arsenopyrite to improve goldcyanidation: study of some parameters andcomparison with grinding," International Journal of Mineral Processing , vol. 52, pp. 65-80,.
7. F. Habashi, 1987"One hundred years of cyanidation," CIM Bulletin 80, pp. 108-114.
8. J. H. I. Marsden, "The Chemistry of Gold Extraction," Ellis Horwood, 1992.
9. P. Karimi , H. Abdollahi , A. Amini , M. Noaparast , S.Z. Shafaei , F. Habashi, 2010 "Cyanidation of gold ores containing copper, silver, lead, arsenic and antimony," International Journal of Mineral Processing, vol. 95, pp. 68-77.
10. Kondos, P.D., Deschenes, G., Morrison, R.M, 1995 "Process optimization studies in gold cyanidation," Hydrometallurgy, vol. 39, p. 235–250,.
11. Weichselbaum, J., Tumilty, J.A., Schmidt, C.G., 1989"The effect of su lphide and lead on the rate of gold cyanidation," in Australia IMM Annual Conference, Australia.
12. B. Roshan, 1990 "Hydrometallurgical processing of precious metal ores," Mineral Processing and Extractive Metallurgy, vol. 6, pp. 67-80.
13. J. C. A. Dunn, 1997 "The recovery of gold from refractory arsenopyrite concentrates by pyrolysis–oxidation," Minerals Engineering, vol. 10, pp. 919-928.
14. Celep, O., Alp, I., Deveci, H., Vicil, M, 2009 "Characterization of refractory behaviour of complex gold/silver ore by diagnostic leaching," Transactions of Nonferrous Metals Society of China, vol. 19, pp. 707-713.
Published
2017-12-29
How to Cite
Hussain, S., Mohammad, N., Rehman, Z., Khan, N., Ahmad, I., Khan, N., & Raza, S. (2017, December 29). EXTRACTION OF GOLD AND SILVER BY CYANIDATION PROCESS FROM COMPLEX ORE OF SHOUGHUR AREA CHITRAL, KYBER PAKHTUNKHWA. JOURNAL OF ENGINEERING AND APPLIED SCIENCES, 36(2). Retrieved from https://journals.uetjournals.com/index.php/JEAS/article/view/2072