The Mineralogical Effect on the Mesophilic Bioleaching of Copper from Smelter Dust and Flotation Concentrate
Subject Areas : Applied MicrobiologyAli Behzad 1 , Zahra Manafi 2 , Mohammad Ranjbar 3
1 - Department of Mining Engineering, Shahid Bahonar University of Kerman, Kerman, Iran
2 - National Iranian Copper Industry Company, Sarcheshmeh, Kerman, Iran
3 - Department of Mining Engineering, Shahid Bahonar University of Kerman, Kerman, Iran
Keywords: Mineralogy, Metallurgical Dust, Flotation Concentrate, Biological Copper Recovery, Mesophiles,
Abstract :
Background and objectives: Nowadays, bacteria are widely used to recover copper from waste, ore, and concentrate. It is very important to understand bacterial performance in relation to materials with different mineralogy in order to select appropriate bacteria and improve bioleaching processes with high performance. As a consequence, the aim of this study is to investigate the effect of smelter dust and flotation concentrate mineralogy on copper recovery from the materials using mesophilic bacteria. Materials and Methods: The effect of processing material mineralogy on biological extraction of copper was investigated using a couple of material with different mineralogy, metallurgical dust and concentrate of Sarcheshmeh copper complex. Bioleaching experiments were performed by using mixed culture of A. ferrooxidans, A. thiooxidans and L. ferrooxidans from Sarcheshmeh Copper Mine in shaker utensils. Results: Metallurgical dust mostly contained secondary sulphides products such as chalcocite and covellite, and concentrate mostly contained primary sulphides product such as chalcopyrite. The extraction rate of copper was achieved 0.835 g/L/day and 0.403 g/L/day from dust and concentrate, respectively. Also, kinetic studies showed that the rate constants of dust and concentrate were 0.125 day-1 and 0.010 day-1, respectively. Conclusion: The impact of mineralogical characteristics of the material on bioleaching operations was significant. Due to highly solubility rates of secondary sulphides, recovery rate and a higher overall copper recovery was obtained from dust in comparison to concentrate. Chalcopyrite oxidation was stopped at relatively low amounts (about 44%) and additional bioleaching time have not been improve it. The experiments showed that standard mesophilic culture at 35 ° C was very successful in bioleaching of secondary sulfide minerals, but bioleaching of primary copper sulfide minerals especially chalcopyrite by the culture was not effective.
1. Akcil A, Ciftci H, Deveci H: Role and contribution of pure and mixed cultures of mesophiles in bioleaching of a pyritic chalcopyrite concentrate. Minerals Engineering. 2007, 20: 310–318.
2. Rodrı´guez Y, Ballester A, Bla´zquez M.L, Gonza´lez F, Mun˜oz J.A: New information on the chalcopyrite bioleaching mechanism at low and high temperature. Hydrometallurgy. 2003, 71: 47 – 56.
3. Olubambi P.A, Ndlovu S, Potgieter J.H, Borode J.O: Effects of ore mineralogy on the microbial leaching of low grade complex sulphide ores. Hydrometallurgy. 2007, 86: 96–104.
4. Boon M, Heijnen J.J: Gas–liquid mass transfer phenomena in bio-oxidation experiments of sulphide minerals: A critical review of literature data. Hydrometallurgy. 1998, 48: 187–204.
5. Lizama H.M, Harlamovs J.R, McKay D.J, Dai Z: Heap leaching kinetics are proportional to the irrigation rate divided by heap height. Minerals Engineering. 2005, 18: 623–630
6. Ghosha M.K, Dasa R.P, Biswasb A.K: Oxidative ammonia leaching of sphalerite Part II: Cu(II)-catalyzed kinetics. Int. J. Miner. Process. 2003, 70: 221– 234.
7. Yadav V.P, Sharma T, Saxena V.K: Dissolution kinetics of potassium from glauconitic sandstone in acid lixiviant. Int. J. Miner. Process. 2000, 60: 15–36.
8. Oral Lac¸in, Bqnyamin Dfnmez, Fatih Demir: Dissolution kinetics of natural magnesite in acetic acid solutions. Int. J. Miner. Process. 2005,75: 91– 99
9. Boon M, Snijder M, Hansford G.S, Heijnen J.J: The oxidation kinetics of zinc sulphide with Thiobacillus ferrooxidans. Hydrometallurgy. 1998, 48: 171–186.
10. Cancho L, Blázquez M.L, Ballester A, González F, Muñoz J.A: Bioleaching of a chalcopyrite concentrate with moderate thermophilic microorganisms in a continuous reactor system. Hydrometallurgy. 2007, 87: 100–111.
11. Ahmadi A, Schaffie M, Manafi Z, Ranjbar M:. Electrochemical bioleaching of high grade chalcopyrite flotation concentrates in a stirred bioreactor. Hydrometallurgy. 2010, 104: 99-105.
12. Bakhtiari F, Atashi H, Zivdar M, Seyed Bagheri S.A: Continuous copper recovery from a smelter's dust in stirred tank reactors. Int. J. Miner. Process. 2008, 86: 50–57
13. Rossi G: Biohydrometallurgy. McGraw-Hill, Hamburg. 1990
14. Sanhueza A, Ferrer I.J, Vargas T, Amils R, Sa´nchez C: Attachment of Thiobacillus ferrooxidans on synthetic pyrite of varying structural and electronic properties. Hydrometallurgy. 1999, 51: 115–129
15. Fathi Habashi: Handbook of hydrometallurgy. Laval University, Quebec City, Canada. 2001, 116-120.
16. Hiroyoshi N, Miki H, Hirajima T, Tsunekawa M: Enhancement of chalcopyrite leaching by ferrous ions in acidic ferric sulfate solutions. Hydrometallurgy. 2001, 60: 185–197.
17. Pinches A, Myburgh P.J, Merwe C:. Process for the rapid leaching of chalcopyrite in the absence of catalysis. 2001, Patent No: US 6, 277, 341 B1.
18. Third K.A, Cord-Ruwisch R, Watling H.R: Control of the redox potential by oxygen limitation improves bacterial leaching of chalcopyrite. Biotechnology and Bioengineering. 2002, 78 (4): 433–441.
19. James E. House: Inorganic Chemistry. Elsevier Inc. 2008, 258-277.
