Article: Coupling diffusion dialysis with precipitation - cementation to separate and recover nitric acid, Cu++, Zn++ and Pb++ from the wastewater of a brass pickling bath Journal: International Journal of Global Warming (IJGW) 2017 Vol.11 No.3 pp.337 - 357 Abstract: This research work applies a clean technology to treat the concentrated wastewater of used HNO3 issued from brass pickling in a large industrial plant. According to the literature this topic was rarely studied. In this study a hybrid process is applied to separate the mixture of nitric acid and dissolved metals (Cu++, Zn++ and Pb++). In order to do that diffusion dialysis is conducted first to separate, purify and recycle the HNO3 excess, then selective precipitation of Pb++ as Pb3(PO4)2 is carried out at low pH, next, cementation of Cu by Zn from the mixture Cu++/Zn++ is conducted, and finally, the remaining is a pure solution of Zn(NO3)2. The new provisional calculation tools and software, important part of this work, have facilitated these processes. Excellent laboratory scale results have been obtained. They represent an efficient alternative to the destructive process based on HNO3 neutralisation and metallic hydroxides sludge precipitation which has serious drawbacks such as loss of the expensive acid, pollution by nitrates, consumption of alkalis and production of a problematic sludge (filtration, storage, fate). Inderscience Publishers - linking academia, business and industry through research

Title: Coupling diffusion dialysis with precipitation - cementation to separate and recover nitric acid, Cu++, Zn++ and Pb++ from the wastewater of a brass pickling bath

Authors: Chahrazad Amrane; Afaf Lalmi; Kamel-Eddine Bouhidel

Addresses: Laboratory of Chemistry and Environmental Chemistry LCCE, Faculty of Sciences, Hadj Lakhdar University, 05000 Batna, Algeria ' Laboratory of Chemistry and Environmental Chemistry LCCE, Faculty of Sciences, Hadj Lakhdar University, 05000 Batna, Algeria ' Laboratory of Chemistry and Environmental Chemistry LCCE, Faculty of Sciences, Hadj Lakhdar University, 05000 Batna, Algeria

Abstract: This research work applies a clean technology to treat the concentrated wastewater of used HNO₃ issued from brass pickling in a large industrial plant. According to the literature this topic was rarely studied. In this study a hybrid process is applied to separate the mixture of nitric acid and dissolved metals (Cu++, Zn++ and Pb++). In order to do that diffusion dialysis is conducted first to separate, purify and recycle the HNO₃ excess, then selective precipitation of Pb++ as Pb₃(PO₄)₂ is carried out at low pH, next, cementation of Cu by Zn from the mixture Cu++/Zn++ is conducted, and finally, the remaining is a pure solution of Zn(NO₃)₂. The new provisional calculation tools and software, important part of this work, have facilitated these processes. Excellent laboratory scale results have been obtained. They represent an efficient alternative to the destructive process based on HNO₃ neutralisation and metallic hydroxides sludge precipitation which has serious drawbacks such as loss of the expensive acid, pollution by nitrates, consumption of alkalis and production of a problematic sludge (filtration, storage, fate).

Keywords: brass pickling bath; nitric acid; HNO3; diffusion dialysis; metals recovery; cementation; plating industry; precipitation; copper; zinc; lead; wastewater treatment; heavy metals.

DOI: 10.1504/IJGW.2017.082780

International Journal of Global Warming, 2017 Vol.11 No.3, pp.337 - 357

Received: 07 Oct 2014
Accepted: 19 Sep 2015
Published online: 12 Mar 2017 *

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Title: Coupling diffusion dialysis with precipitation - cementation to separate and recover nitric acid, Cu++, Zn++ and Pb++ from the wastewater of a brass pickling bath

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