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4128581 
Journal Article 
Coupling diffusion dialysis with precipitation cementation to separate and recover nitric acid, Cu plus plus , Zn plus plus and Pb plus plus from the wastewater of a brass pickling bath 
Amrane, C; Lalmi, A; Bouhidel, KE 
2017 
Yes 
International Journal of Global Warming
ISSN: 1758-2083 
INDERSCIENCE ENTERPRISES LTD 
GENEVA 
11 
3 
337-357 
WOS:000404012600010 
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 Pb-3(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). 
brass pickling bath; nitric acid; diffusion dialysis; metals recovery; cementation; plating industry 
2nd International Conference on Recycling and Reuse 
Istanbul, TURKEY