New reagents for controlling of H2O2 by metal sulfide and its effect in sulfide mineral floatation

Document Type : Research Paper


Department of Engineering, University of Kashan, 8731753153 Kashan, Iran


Our recent studies revealed that the ground sulphide minerals in contact with water generate H2O2 but its effect on the oxidation of pulp components and hence in deteriorating the concentrate grade and recovery in flotation has not been explored yet. The use of Na2S reductant at the grinding stage is thought to control the deleterious effects of H2O2 in the pulp liquid. Therefore, the effect of Na2S addition during grinding stage on the formation of H2O2 and its influence on sulphide complex ore flotation was investigated. The results showed that the presence of Na2S increases the formation of H2O2 but decreases the dissolved oxygen. An increase in Na2S dosage in grinding, the Pb grade and recovery in Cu-Pb concentrate is decreased while pyrite is depressed marginally better. These changes in flotation response of sulphides have been discussed and explained with the formation of H2O2 quantitatively.


[1] Javadi Nooshabadi, A. & Hanumantha Rao, K., (2013). Formation of hydrogen peroxide by pyrite and its influence on flotation. Minerals Engineering, Volume 49, p. 128–134.
[2] Javadi Nooshabadi, A. & Hanumantha Rao, K., (2013). Formation of hydrogen peroxide by chalcopyrite and its influence on flotation. Minerals and Metallurgical Processing, Volume 30(4), p. 212-219.
[3] Javadi Nooshabadi, A. & Hanumantha Rao, K., (2013). Formation of hydrogen peroxide by sphalerite. International Journal of Mineral Processing, Volume 125, p. 78–85.
[4] Javadi Nooshabadi, A. & Hanumantha Rao, K., (2014). Formation of hydrogen peroxide by galena and its influence on flotation. Advanced Powder Technology, Volume 25(3), p. 832-839
[5] Freeman, W., Newell, R. & Quast, K., (2000). Effect of grinding media and NaHS on copper recovery at North Parkes Mines. Minerals Engineering, 13(13), p. 1395–1403.
[6] Orwe, D., Grano, S. & Lauder, D., (1998). Increasing fine copper recovery at the Ok Tedi concentrator, Papua New Guinea. Minerals Engineering, Volume 11(2), p. 171–187.
[7] Houot, R. & Duhamet, D., (1992). The use of sodium sulphite to improve the flotation selectivity between chalcopyrite and galena in complex sulphide ore. Mineral engineering, 5(3-5), pp. 343-355.
[8] Shen, W., Fornasiero, D. & Ralston, J., (2001). Flotation of sphalerite and pyrite in the presence of sodium sulfite. International Journal of Mineral Processing, Volume 63(1), p. 17-28.
[9] Grano, S., Cnossen H., Skinner W., Prestidge A., Ralston J., (1997). Surface modification in the chalcopyrite–sulfite ion system: II. Dithiophosphate collector adsorption study. Int. J. Miner. Process., Volume 50, p. 27–45.
 [10] Grano, S., Prestidge, C. & Ralston, J., (1997). Sulphite modification of galena surfaces and its effect on flotation and xanthate adsorption. Int. J. Miner. Process., Volume 52, p. 1–29.
 [11] Misra, M., Miller, J. & Song, Q., (1985). The effect of SO2 in the flotation of sphalerite and chalcopyrite. In: K. Forssberg, ed. Flotation of Sulfide Minerals, Developments in Mineral Processing. Amsterdam: Elsevier, p. 175–196.
[12] Yamamoto, T., (1980). Mechanism of pyrite depression by sulphite in the presence of sphalerite. In: M. Jones, ed. In: Complex Sulphide Ores. s.l.:Ed. London, IMM, p. 71-78..
[13] Javadi Nooshabadi, A. & Hanumantha Rao, K., (2016). Complex sulphide ore flotation: Effect of depressants addition during grinding on H2O2 formation and its influence on flotation, International Journal of Mineral Processing, Volume 157, P. 89-97.
 [14] Baga, A.N., Johnson G.R.A., Nazhat, N.B., Saadalla-Nazhat, R.A., (1988), A simple spectrophotometric determination of hydrogen peroxide at low concentrations in aqueous solutions, Anal. Chim. Acta, 204, 349-353.
[15] Cohn, C., Mueller S., Wimmer E., Leifer N., Greenbaum S., Strongin D.R., Schoonen M.A., (2006). Pyrite-induced hydroxyl radical formation and its effect on nucleic acids. Geochem. Trans. 7, p. 1.
[16] Ikumapayi, F., Sis, H., Johansson, B. & Hanumantha Rao, K., (2012). Recycling process water in sulphide flotation, Part B: Effect of H2O2 and process water components on sphalerite flotation from complex sulphide. Miner. Metall. Process. Volume 29, p. 192–198.
[17] Owusu, C.; Fornasiero, D.; Addai-Mensah, J.; Zanin, M., (2014). Effect of regrinding and pulp aeration on the flotation of chalcopyrite in chalcopyrite/pyrite mixtures, Powder Technology, Volume 267, p. 61-67.
[18] Hu, Y., Sun, W. & Wang, D., (2009). Electrochemistry of Flotation of Sulphide Minerals. Beijing: Tsinghua University Press,
[19] Smith, B., (1999). Infrared Special Interpretation- A Systematic Approach. In: USA: s.n., p. 67-163.
[20] Socrates, G., (2001). Infrared and Raman Characteristic Group Frequencies - Table. In: J. W. &. Sons, ed. s.l.:Ltd, Chichester, p. 68- 227