Atmospheric sulfuric acid leaching thermodynamics from metallurgical zinc-bearing dust sludge

Atmospheric sulfuric acid leaching thermodynamics from metallurgical zinc-bearing dust sludge

Jinxia Zhang Weiguang Sun  Fusheng Niu  Long Wang  Yawei Zhao  Miaomiao Han 

College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China

Hebei Province Mining Industry Develops with Safe Technology Priority Laboratory, Tangshan 063210, China

Corresponding Author Email:
3 August 2017
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18 October 2017
| | Citation



In this paper, the influence of zinc and iron reaction in sulfuric acid leaching system, the influence of the parameters on the leaching of zinc sulfate and the reaction conditions for the subsequent leachate purification were systematically studied. It is suggested that the primary zinc and iron phases in metallurgical zinc-bearing dust sludge are ZnO, ZnS, ZnFe2O4, Fe, Fe2O3 and Fe3O4. In Zn-Fe-H2O system, as the concentrations of zinc and iron ions in solution increase, each component therein remains unchanged. The dominant area is subjected to change with solution pH. When the potential and pH are respectively controlled within a different scope, Zn, Fe separation proceeds at the different levels. Fe2O3 is difficult to be leached when sulfuric acid is used as an agent. ZnO is leached while the iron ion is inhibited by pH control. It is found by comparison of lg[C]-pH maps of Fe2O3 and Fe(OH)2, Fe(OH)3 that in the treatment of subsequent leachate, Fe2+ can be oxidized into Fe3+ by adding an proper amount of the oxidant to solution, and Fe3+ forms Fe(OH)3 sediment by additive NaOH in solution. This hits the mark of iron removal. The research results have important theoretical significance for the leaching and purification process of alkali leaching-electrolysis process.


zinc-bearing dust sludge, leaching, thermodynamics, potential (φ)-pH dominant area diagram

1. Introduction
2. Materials and Methods
3. Leaching Thermodynamics of Zinc-Bearing Dust Sludge
4. Conclusion

[1] Zhuang CL, Liu JH, Cui H, Liu ST, Attorre DR, Hunt J. (2011). Basicproperties and comprehensive utilization of iron-containing sludge & dust in the steelmaking process. Journal of University of Science and Technology Beijing 33(11): 185-193.

[2] Wang F, Zhang JL, Mao R, Liu ZJ. (2016). Bonding mechanism and strength deterioration of self-reducing briquettes made from iron-bearing dust and sludge. Journal of Central South University (Science and Technology) 47(2): 367-372. 10.11817/j.issn.1672-7207.2016.02.002

[3] Virolainen S, Salmimies R, Hasan M, Häkkinen A, Sainio T. (2013). Recovery of valuable metals from argon oxygen decarburization (AOD) dusts by leaching. Filtration and Solvent Extraction, Hydrometallurgy 140(11): 181-189. 10.1016/j.hydromet.2013.10.002

[4] Joldeș NT, Gyenge C, Achimaș G. (2017). The waste and the environment. Academic Journal of Manufacturing Engineering 15(2): 111-114.

[5] Wu ZJ, Huang W, Cui KK, Gao ZF, Wang P. (2014). Sustainable synthesis of metals-doped zno nanoparticles from zinc-bearing dust for photodegradation of phenol. Journal of Hazardous Materials 278(8): 91-99. 10.1016/j.jhazmat.2014.06.001

[6] Steer JM, Griffiths AJ. (2013). Investigation of carboxylic acids and non-aqueous solvents for the selective leaching of zinc from blast furnace dust slurry. Hydrometallurgy 11(140): 34-41. 10.1016/j.hydromet.2013.08.011

[7] Kul M, Oskay KO, Şimşir M, Sübütay H, Kirgezen H. (2015). Optimization of selective leaching of zn from electric arc furnace steelmaking dust using response surface methodology. Transactions of Nonferrous Metals Society of China 25(8): 2753-2762. 10.1016/S1003-6326(15)63900-0

[8] Li Q, Zhang B, Min XB, Shen WQ. (2013). Acid leaching kinetics of zinc plant purification residue. Transactions of Nonferrous Metals Society of China 23(9): 2786-2791. 10.1016/S1003-6326(13)62798-3

[9] Karayannis V, Domopoulou A, Baklavaridis A, Kyratsis P. (2016). Ceramic processing via microwave irradiation. Academic Journal of Manufacturing Engineering 14(4): 54-61.

[10] Yang SH, Li H, Sun YW, Chen YM, Tang CB, He J. (2016). Leaching kinetics of zincsilicate in ammonium chloride solution. Transactions of Nonferrous Metals Society of China 26(6): 1688-1695. 10.1016/S1003-6326(16)64278-4

[11] Bai SP. (2007). Study on efficient utilization of bf gas slime Chongqing: chongqing university.

[12] Ding ZY, Chen QY, Yin ZL. (2013). Predominance diagrams for zn(ii)-nh3-cl-h2o system. Transactions of Nonferrous Metals Society of China 23(3): 832-840. 

[13] Barin I, Platzki G. (1995). Thermochemical data of pure substances, Parts I. and II, Weinheim: Vch Verlagsgesellschaft mbH, pp. 1-2. 10.1002/9783527619825

[14] Knacke O, Kubaschewski O, Hesselman K. (1991). Thermochemical properties of inorganic substances, 2nd springer-verlag, 1991: 1114-2412.

[15] Melik B, Iezid M, Goumeidane F, Legouera M. (2017). Structure and mechanical properties of steels for thermochemical treatment. Mathematical Modelling of Engineering Problems 4(1): 23-25. 10.18280/mmep.040105

[16] Qin YH, Wang YY. (2000). Thermodynamics equilibrium of bi3+-cl−-h2o system. The Chinese Journal of Nonferrous Metals 10(2): 243-249.

[17] Wang RX, Tang MT, Yang JG, Yang SH, Zhang WH, Tang CB, He J. (2008). Thermodynamics of zn(Ⅱ) complex equilibrium in system of zn(Ⅱ)-nh3-cl−-co32−-h2o. The Chinese Journal of Nonferrous Metals 18(s1): s192-s198.

[18] Zhang CF, Yao YL, Zhan J. (2012). Thermodynamics of precipitation–coordination equilibrium in fe2+-ni2+-nh3-nh4+-c2o42−-h2o system. The Chinese Journal of Nonferrous Metals 22(12): 2938-2943.

[19] Dean JA. (2003). Lange's Handbook of Chemistry (II). Materials and Manufacturing Processes 5(4): 687-688. 10.1080/10426919008953291

[20] Cao ZM, Song XY, Qiao ZY. (2008), Thermodynamic modeling software factsage and it application. Chinese Journal of Rare Metals 32(4): 216-219.