Leaching of Hemimorphite in Neutral Solution at High Temperature

  • Duoqiang Zhao School of Metallurgy and Environment, Central South University
  • Shenghai Yang School of Metallurgy and Environment, Central South University
  • Yongming Chen School of Metallurgy and Environment, Central South University
  • Chaobo Tang School of Metallurgy and Environment, Central South University
  • Jing He School of Metallurgy and Environment, Central South University
  • Hao Li School of Metallurgy and Environment, Central South University

Abstract


The leaching behavior of hemimorphite in neutral solution (NH4+-Cl--H2O) was investigated at high temperature(T > 100 °C) under a range of experimental conditions. Thermodynamic calculations indicate that the tendency of dehydration of silica gel is significantly enhanced with increasing temperature. It is shown that the temperature, ammonium chloride concentration or L/S ratio increased resulted in a greater leaching efficiency. The following optimized leaching conditions were obtained: stirrer speed 400r/min, NH4Cl concentration 5.5M, L/S ratio 9mL/g at 160℃ for 3h. Under these optimized conditions, the average of zinc was 97.82%. The silicon was converted to quartz and remained in the residue. This process can be used to dispose willemite and hemimorphite as it solves the problem of silica gel dehydration.

References

Qin, W. Q.; Li, W. Z.; Lan, Z. Y.; et al., 2007, “Simulated small-scale pilot plant heap leaching of low-grade oxide zinc ore with integrated selective extraction of zinc.” Miner. Eng., 20, pp. 694-700.

Ahmed, I. M.; Nayl, A. A.; Daoud J. A., 2016, “Leaching and recovery of zinc and copper from brass slag by sulfuric acid.” J. Saudi Chem. Soc., 20, pp. 280-285.

Kashani A. H. N.; Rashchi F., 2008, “Separation of oxidized zinc minerals from tailings: Influence of flotation reagents.” Min. Eng., 21, pp. 967-972.

Zhang, Y. D.; Hua, Y. X.; Gao, X. B., 2016, “Recovery of zinc from a low-grade zinc oxide ore with high silicon by sulfuric acid curing and water leaching.” Hydrometallurgy, 166, pp. 16-21.

Wang, X.; Srinivasakannan, C.; Duan, X. H.; et al., 2013, “Leaching kinetics of zinc residues augmented with ultrasound.” Sep. Purif. Technol., 115, pp. 66-72.

Terry B.; Monhemius A. J., 1983, “Acid dissolution of willemite (Zn,Mn)2SiO4 ) and hemimorphite (Zn4Si2O(OH)2H2O).” Metall. Mater. Trans. B, 14, pp. 335-346.

Bodas M. G., 1996, “Hydrometallurgical treatment of zinc silicate ore from Thailand.” Hydrometallurgy, 40, pp. 37-49.

Matthew I. G.; Elsner D., 1977, “The hydrometallurgical treatment of zinc silicate ores.” Metall. Trans. B, 8, pp. 73-83.

Fabiano, M. O.; Pablo S.; Rodrigo, P.; et al., 2010, “The kinetics of zinc silicate leaching in sodium hydroxide.” Hydrometallurgy, 102, pp.43-49.

Chen A.; Zhao Z. W.; Jia X., 2009, “Alkaline leaching Zn and its concomitant metals from refractory hemimorphite zinc oxide ore.” Hydrometallurgy, 97(3–4), pp. 228-232.

Zhao Z.; Long S. Chen A. Mechanochemical leaching of refractory zinc silicate (hemimorphite) in alkaline solution. Hydrometallurgy. 2009, 99, pp. 255-258.

Rao, S.; Zhang, D. C.; Yang, T.Z., 2017, “Recovery of zinc and the regeneration of the complexation agent from the NH4Cl-NH3-NTA system.” Hydrometallurgy, 169, pp. 508-514.

Harvey T.G., 2006, “The hydrometallurgical extraction of zinc by ammonium carbonate: a review of the schnabel process.” Min. Process. Extr. M. Rev., 27, pp. 231-279.

Nogueira C. A.; Margarido F., 2015, “Selective process of zinc extraction from spent Zn-MnO2, batteries by ammonium chloride leaching.” Hydrometallurgy, 157, pp. 13-21.

Amer S.; Luis A., 1995, “The extraction of zinc and other minor metals from concentrated ammonium chloride solutions with D2EHPA and Cyanex 272.” Rev. Meta. Madrid., 31, pp. 351-360.

Mitra S.A.; Acosta G.M.; Khan J., 1997, “Extraction of zinc oxide from electric arc furnace dust. Solubilities of zinc chloride and zinc oxide in aqueous ammonium chloride solutions from 303–363.” K. J. Environ. Sci. Hea. B, A32,pp. 497-515.

Liu Z.; Liu Z.; Li Q., 2012, “Leaching of hemimorphite in NH3-(NH4)2SO4-H2O system and its mechanism.” Hydrometallurgy, 125–126, pp. 137-143.

Ding Z.; Yin Z.; Hu H. P., 2010, “Dissolution kinetics of zinc silicate (hemimorphite) in ammoniacal solution.” Hydrometallurgy, 104 (2), pp. 201-206.

Yin Z. L.; Ding Z. Y.; Hu H. P., 2010, “Dissolution of zinc silicate (hemimorphite) with ammonia- ammonium chloride solution.” Hydrometallurgy, 103, pp. 215-220.

Liu Z.; Liu Z.; Li Q., 2012, “Dissolution behavior of willemite in the (NH4)2SO4–NH3–H2O system.” Hydrometallurgy, 125–126, pp. 50-54.

He S.; Wang J.; Yan J., 2011, “Pressure leaching of synthetic zinc silicate in sulfuric acid medium.” Hydrometallurgy, 108, pp.171-176.

Published
2020/09/15
How to Cite
Zhao, D., Yang, S., Chen, Y., Tang, C., He, J., & Li, H. (2020). Leaching of Hemimorphite in Neutral Solution at High Temperature. Journal of Mining and Metallurgy, Section B: Metallurgy, 56(2), 203-208. Retrieved from https://aseestant.ceon.rs/index.php/jmm/article/view/23617
Issue
Vol. 56 No. 2 (2020)
Section
Original Scientific Paper

Authors retain copyright of the published papers and grant to the publisher the non-exclusive right to publish the article, to be cited as its original publisher in case of reuse, and to distribute it in all forms and media.

The Author(s) warrant that their manuscript is their original work that has not been published before; that it is not under consideration for publication elsewhere; and that its publication has been approved by all co-authors, if any, as well as tacitly or explicitly by the responsible authorities at the institution where the work was carried out. The Author(s) affirm that the article contains no unfounded or unlawful statements and does not violate the rights of others. The author(s) also affirm that they hold no conflict of interest that may affect the integrity of the Manuscript and the validity of the findings presented in it. The Corresponding author, as the signing author, warrants that he/she has full power to make this grant on behalf of the Author(s). Any software contained in the Supplemental Materials is free from viruses, contaminants or worms.

The published articles will be distributed under the Creative Commons Attribution ShareAlike 4.0 International license (CC BY-SA).

Authors are permitted to deposit publisher's version (PDF) of their work in an institutional repository, subject-based repository, author's personal website (including social networking sites, such as ResearchGate, Academia.edu, etc.), and/or departmental website at any time after publication.

Upon receiving the proofs, the Author(s) agree to promptly check the proofs carefully, correct any typographical errors, and authorize the publication of the corrected proofs.

The Corresponding author agrees to inform his/her co-authors, of any of the above terms.