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Ammoniacal leaching behavior and regularity of zinc ash

  • Hailin Long , Xuezhi Tan , Shufang Ni , Aiyuan Ma , Shiwei Li EMAIL logo and Deqing Zhu EMAIL logo
Published/Copyright: December 5, 2022
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International Journal of Chemical Reactor Engineering
From the journal International Journal of Chemical Reactor Engineering Volume 21 Issue 7

Abstract

In this work, a new hydrometallurgical process was developed to treat zinc ash produced from the hot galvanizing industry. The theoretical analysis shows the feasibility of dissolving zinc ash in the NH3–NH4Cl–H2O system, and the dissolution products are predominantly composed of Zn (NH3)4 2+. The impacts of different experimental conditions were examined, and the leaching ratio of zinc was as high as 96.4% under the conditions of NH3/NH4 + ratio of 1:1, liquid/solid of 9:1, total ammonia concentration of 8 mol/L and the stirring speed of 250 rpm at 313 K for 120 min. The kinetics of the leaching process were investigated and the calculated apparent activation energy was approximately 4.69 kJ/mol, which indicated that the zinc ash leaching process was controlled by diffusion-controlled. As revealed by the determination of impurity ions, on one hand, there were fewer impurities in the leaching solution, and the concentrations of Fe2+ and Pb2+ in solution are less than 0.02 mg/L and 0.05 mg/L respectively; on the other hand, there was no need for further impurity removal in this process. The proposed process has a certain application value in treating zinc ash.

Keywords: ammonia leaching; kinetic research; zinc ash; zn recovery
Corresponding authors: Shiwei Li, State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, Yunnan, China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China; and Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming 650093, Yunnan, China, E-mail: ; and Deqing Zhu, School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China, E-mail:

Funding source: the Science and Technology Innovation Group of Liupanshui Normal University

Award Identifier / Grant number: LPSSYKJTD201801

Funding source: the Liupanshui Key Laboratory of Metallurgical Energy Saving, Environmental Protection and Recycling Economy

Award Identifier / Grant number: 52020-2018-0304

Funding source: Yunan Ten Thousand Talents Plan Young & Elite Talents Project

Award Identifier / Grant number: YNWR-QNBJ-2018-112

Funding source: Liupanshui Normal University

Award Identifier / Grant number: Unassigned

  1. Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: Financial aid from the following programs is gratefully acknowledged: Yunan Ten Thousand Talents Plan Young & Elite Talents Project (grant number YNWR-QNBJ-2018-112), the Liupanshui Key Laboratory of Metallurgical Energy Saving, Environmental Protection and Recycling Economy (52020-2018-0304), and the Science and Technology Innovation Group of Liupanshui Normal University (LPSSYKJTD201801).

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2022-05-03
Accepted: 2022-11-19
Published Online: 2022-12-05

© 2022 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.1515/ijcre-2022-0087
Keywords for this article
ammonia leaching; kinetic research; zinc ash; zn recovery

Articles in the same Issue

  1. Frontmatter
  2. Articles
  3. Size-dependent growth kinetics model for potassium chloride from seeded chloride solution
  4. Insights into kinetics and equilibrium of methylene blue adsorption onto β-cyclodextrin polymers
  5. Development of a new rotating photocatalytic reactor for the degradation of hazardous pollutants
  6. Promotional effects of cerium and titanium on NiMn2O4 for selective catalytic reduction of NO by NH3
  7. Sliding mode controller design based on simple closed loop set point experiment for higher order processes with dead time
  8. Performance evaluation of adaptive based model predictive control for ethylene glycol production from dimethyl oxide hydrogenation
  9. Experimental study on the combustion characteristics of blends of sugarcane bagasse, Nanning meager-lean coal and petroleum coke
  10. Ammoniacal leaching behavior and regularity of zinc ash
  11. Enhanced dual-DOF PI-PD control of integrating-type chemical processes
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