Reduction smelting on bismuth oxide residue in FeO-SiO₂-CaO ternary slag system

Abstract

Reduction smelting of the bismuth oxide residue from pressure leaching of bismuth sulfide was investigated in the FeO-SiO₂-CaO ternary slag system. The results show that all the recovery ratios of Bi, Ag, Cu and Pb increase with the increase of reductive coal proportion, reaction temperature and time, while too much reductive coal would help Fe enter metal phase; CaO/SiO₂ and FeO/SiO₂ of the chosen slag system should be 0.5-0.75 and 1.25-1.75, respectively, for the reason that the slag system has the optimum mobility and is beneficial for the recovery of metals. The corresponding optimum conditions are determined as follows: the added coal proportion is 7% of the leaching residue, CaO/SiO₂ mass ratio in the chosen slag system is 0.5 and FeO/SiO₂ is 1.5, the reaction temperature is 1300 °C and the reaction time is 40 min. Under the above conditions, the recovery ratios of Bi, Ag, Cu and Pb are 99.6%, 99.8%, 97.0% and 97.3%, respectively.

Keywords

bismuth oxide residue / reduction smelting / FeO-SiO₂-CaO ternary slag system / recovery ratio

References

[1] WangL-guoBismuth metallurgical [M], 1989, 3-6(18-46): 72-98

[2] KimD, WangS-jie. Bismuth recovery from hydrochloric acid solution [J]. Canadian Metallurgical Quarterly, 2008, 47(3): 317-326

[3] ZhengG-q, TangM-tang. Physico-chemistry in distillation process of BiCl3-HCl-H2O system [J]. Transactions of Nonferrous Metals Society of China, 2002, 12(5): 987-991

[4] WangJ-f, LiJ, YangJ-guang. Recovery of bismuth from a bismuthinite concentrate by membrane-electrowinning [J]. Hydrometallurgy of China, 2012, 1: 45-48

[5] WangY-y, PengW-j, ChaiL-yuan. Thermodynamic equilibrium of bismuth hydrometallurgy in chloride and nitrate solutions [J]. Journal of Central South University of Technology, 2004, 11(4): 410-413

[6] KhmelnitskayaoD, BeskrovnayavP. A technology of precious metals recovery from gold-bismuth ores [C]// World Gold 2007 by the Co-Products and the Environment-Proceedings. Australasian Institute of Mining and Metallurgy Publication Series, 2007245-250

[7] ZhangD-chaoTungsten and molybdenum separation from bismuth by alkaline pressure oxidation of bismuth sulfide concentrate [D], 2012ChangshaCentral South University

[8] WeiC, WangJ-z, JiangQi. Some knowledge of H2SiF6 and its salts [J]. Journal of Kunming University of Science and Technology, 2001, 6: 97-100

[9] ZhangC-f, ZhangX, ZhanJing. A new process of fluosilicic acid leaching for recovering bismuth from materials containing bismuth oxide [C]// TMS Annual Meeting. United States: Minerals, Metals and Materials Society, 2014413-424

[10] SwinbourneD R. Thermodynamic modeling of bismuth smelting by the coal/iron reduction method [C]// A New Century International Conference on Metallurgical High Technology and New Materials of Heavy Nonferrous Metals. Kunming, China, 200253-61

[11] YangT-z, LiJ, LiuW-f, ChenL, BinW-da. Development of bismuth smelting technology in China [C]// TMS Annual Meeting. United States: Minerals, Metals and Materials Society, 2013631-642

[12] Beijing Nonferrous Metallurgy DesignResearch Institute.Heavy non-ferrous metal smelting design manual (Lead, zinc and bismuth volume) [M], 1996, 643-652: 672-676

[13] PengR-qiuNon-ferrous metals extraction manual (Zinc, cadmium, lead and bismuth volume) [M], 1992BeijingBeijing Industry Press423-424

[14] YangJ-g, HeD-w, TangC-b, ChenY-m, SunY-h, TangM-tang. Thermodynamics calculation and experimental study on separation of bismuth from a bismuth glance concentrate through a low-temperature molten salt smelting process [J]. Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, 2011, 8: 730-737

[15] ChenL, BinW-d, YangT-z, LiuW-f, BinShu. Research and industrial application of oxygen-rich side-blow bath smelting technology [C]// TMS Annual Meeting. United States: Minerals, Metals and Materials Society, 201349-55

[16] XiaoJ-f, TangC-b, TangM-t, ChenY-ming. Study on a new process for alkaline smelting bismuth sulfide concentrate at low temperature [J]. Mining and Metallurgical Engineering, 2009, 29(5): 82-85

[17] KhanturgaevaG I, ZoltoevE V, UrbazaevaS D. Technology for processing the bismuth-silver concentrates [J]. Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, 2002, 1: 103-107

[18] MargulisE V. Low temperature smelting of lead metallic scrap [J]. Erzmetall, 2003, 53(2): 85-89

[19] PicklesC A, ToguriJ M. Soda ash smelting of lead chloride [J]. Canadian Metallurgical Quarterly, 1988, 27(2): 117-122

[20] ZhangD-c, YangT-z, LiuW-f, Wuj-hua. Pressure leaching of bismuth sulfide concentrate containing molybdenum and tungsten in alkaline solution [J]. Journal of Central South University, 2012, 19(12): 3390-3395

[21] LiH-guiMetallurgical principles [M], 2009BeijingScience Press39-43