Towards a circular nickel-plated steel (NPS) industry

Muawya Elayyan Mohammad Hindi, Muawya Hindi

Towards a circular nickel-plated steel (NPS) industry

A method to selectively dissolve nickel coatings from NPS in ammoniacal solutions

Master thesis (2024)

Authors

Muawya Hindi Muawya Elayyan Mohammad Hindi Mechanical Engineering

Contributors

Y. Yang Team Yongxiang Yang (mentor)

N. Dogan Team Yongxiang Yang (graduation committee member)

A.J. Wittebrood (mentor)

Faculty

Mechanical Engineering

Circular economy Nickel Ammonia Selective leaching Nickel-plated steel Thiosulfate Persulfate

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Published Date

25-09-2024

Language

English

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Faculty

Mechanical Engineering

Abstract

A patent pending ammonia-based hydrometallurgical method is developed to selectively leach nickel coatings from the Nickel-Plated Steel sheets (NPS). The leaching process starts with the removal of the passive nickel oxide film by Na2S2O3.5H2O addition into the solution, followed by the dissolution of the metallic nickel. Leaching stops due to the passivation of the diffusion region between the coating and the steel. The experiments were conducted using two different ammoniacal systems, the NH3-(NH4)¬2S2O8-Na2S2O3.5H2O and the NH3-(NH4)¬2SO4-Na2S2O3.5H2O system, resulting in leaching efficiencies of 98% and 91% respectively.

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