Consolidation mechanism of gold concentrates containing sulfur and carbon during oxygen-enriched air roasting

Qian Li; Fang-zhou Ji; Bin Xu; Jian-jun Hu; Yong-bin Yang; Tao Jiang

doi:10.1007/s12613-017-1418-1

Volume 24 Issue 4

Apr. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(4): 386-392

Qian Li, Fang-zhou Ji, Bin Xu, Jian-jun Hu, Yong-bin Yang, and Tao Jiang, Consolidation mechanism of gold concentrates containing sulfur and carbon during oxygen-enriched air roasting, Int. J. Miner. Metall. Mater., 24(2017), No. 4, pp. 386-392. https://doi.org/10.1007/s12613-017-1418-1

Cite this article as:

Qian Li, Fang-zhou Ji, Bin Xu, Jian-jun Hu, Yong-bin Yang, and Tao Jiang, Consolidation mechanism of gold concentrates containing sulfur and carbon during oxygen-enriched air roasting, Int. J. Miner. Metall. Mater., 24(2017), No. 4, pp. 386-392. https://doi.org/10.1007/s12613-017-1418-1

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Research Article

Consolidation mechanism of gold concentrates containing sulfur and carbon during oxygen-enriched air roasting

+ Author Affiliations

Corresponding author:
Bin Xu E-mail: xubincsu@csu.edu.cn
Received: 27 July 2016; Revised: 16 December 2016; Accepted: 19 December 2016

Abstract

Abstract

Consolidation in calcines is a common problem in the oxygen-enriched air roasting of refractory gold concentrates containing sulfur and carbon when the initial temperature is greater than 600℃. To determine the phases that caused consolidation, gold concentrates were roasted under different conditions and the calcines were mainly detected by X-ray diffraction (XRD). The possible underlying mechanism was then studied through comparisons of the XRD patterns of different calcines. The results indicated that the generation of calcium magnesium silicate, iron-doped calcium aluminosilicate, and calcium aluminate caused the consolidation. Furthermore, an enriched oxygen atmosphere accelerated the oxidation reaction and the emitted heat increased the local temperature in calcines. The local temperature was inferred to have increased to the generation temperature zone of the corresponding liquid phases. Oxidation of the pyrite and decomposition of the dolomite and muscovite mainly occurred at the initial stage of oxygen-enriched air roasting. Calcium was confirmed to be essential to the consolidation process.
- gold;
- concentrates;
- consolidation;
- mechanisms;
- roasting;
- calcines

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[1]	B. Xu, Y. B. Yang, Q. Li, T. Jiang, S. Q. Liu, and G. H. Li, The development of an environmentally friendly leaching process of a high C, As and Sb bearing sulfide gold concentrate, Miner. Eng., 89(2016), p. 138.
[2]	R. K. Amankwah and C. A. Pickles, Microwave roasting of a carbonaceous sulphidic gold concentrate, Miner. Eng., 22(2009), No. 13, p. 1095.
[3]	K. L. Rees and J. S. J. van Deventer, Preg-robbing phenomena in the cyanidation of sulphide gold ores, Hydrometallurgy, 58(2000), No. 1, p. 61.
[4]	F. Fang, H. Zhong, F. M. Jiang, Z. H. Li, Y. F. Chen, and X. H. Zhan, Influence of surfactants on bioleaching of arsenic-containing gold concentrate, J. Cent. South Univ., 21(2014), No. 10, p. 3963.
[5]	W. Yang, W. Q. Qin, R. Q. Liu, and Y. C. Ren, Effect of chloride ion on bacterial pre-oxidation of arsenic-containing gold concentrate, J. Cent. South Univ. Technol., 18(2011), No. 5, p. 1418.
[6]	B. Xu, Y. B. Yang, Q. Li, W. Yin, T. Jiang, and G. H. Li, Thiosulfate leaching of Au, Ag and Pd from a high Sn, Pb and Sb bearing decopperized anode slime, Hydrometallurgy, 164(2016), p. 278.
[7]	B. Xu, Y. B. Yang, Q. Li, G. H. Li, and T. Jiang, Fluidized roasting-stage leaching of a silver and gold bearing polymetallic sulfide concentrate, Hydrometallurgy, 147-148(2014), p. 79.
[8]	B. Xu, Y. B. Yang, Q. Li, T. Jiang, and G. H. Li, Stage leaching of a complex polymetallic sulfide concentrate:focus on the extraction of Ag and Au, Hydrometallurgy, 159(2015), p. 87.
[9]	B. Xu, Y. B. Yang, T. Jiang, Q. Li, X. Zhang, and D. Wang, Improved thiosulfate leaching of a refractory gold concentrate calcine with additives, Hydrometallurgy, 152(2015), p. 214.
[10]	S. E. Khalafalla and I. D. Shah, Oxidative roasting of covellite with minimal retardation from the CuO·CuSO₄ film, Metall. Mater. Trans. B, 1(1970), No. 8, p. 2151.
[11]	H. Tan, D. Feng, J. S. J. van Deventer, and G. C. Lukey, Effect of contaminant carbonaceous matter on the sorption of gold by pyrite, Int. J. Miner. Process., 76(2005), No. 4, p. 244.
[12]	H. Tan, D. Feng, G. C. Lukey, and J. S. J. van Deventer, The behaviour of carbonaceous matter in cyanide leaching of gold, Hydrometallurgy, 78(2005), No. 3-4, p. 226.
[13]	Y. J. Hu, Study on Mechanism of Roasting and Vanadium Leaching for High Calcium Mica-type Vanadium-bearing Black Shale[Dissertation], Wuhan University of Technology, Wuhan, 2012, p. 36.
[14]	C. P. Yan, Q. C. Yu, D. C. Liu, X. F. Kong, B. Q. Xu, Y. Deng, and B. Yang, Decomposition of calcium sulphate by carbothermic reduction at reduced pressures, Chin. J. Vac. Sci. Technol., 34(2014), No. 5, p. 517.
[15]	J. Y. Fu, T. Jiang, and D. Q. Zhu, Sintering and Pelletizing of Iron Ores, Central South University Press, Changsha, 2010, p. 96.
[16]	P. G. He, Z. H. Yang, X. M. Duan, D. C. Jia, S. J. Wang, and Y. Zhou, Progress on the formation of ceramics and ceramic-based composites through geopolymer precursors, Chin. Sci. Bull., 60(2015), No. 3, p. 226.
[17]	H. Liu, S. Katagiri, U. Kaneko, and K. Okazaki, Sulfation behavior of limestone under high CO₂ concentration in O₂/CO₂ coal combustion, Fuel, 79(2000), No. 8, p. 945.
[18]	İ. Ar and S. Balci, Sulfation reaction between SO₂ and limestone:application of deactivation model, Chem. Eng. Process., 41(2002), No. 2, p. 179.