Open AccessCementation of Cd Ions on Zinc Using a Rotating Fixed Bed Impeller Basket Reactor
Author(s) -
Yousra Hamdy Farid
Publication year - 2021
Publication title -
asian journal of applied chemistry research
Language(s) - English
Resource type - Journals
ISSN - 2582-0273
DOI - 10.9734/ajacr/2021/v9i430222
Subject(s) - raschig ring , cementation (geology) , zinc , cadmium , chemistry , materials science , metal ions in aqueous solution , metallurgy , packed bed , nuclear chemistry , metal , chromatography , cement
Cementation or metal displacement reaction is one of the most effective techniques for removing toxic metals from industrial waste solutions.
Aims: The main purpose of this work is to study the rate of cementation of cadmium by using a rotating bed of Zn Raschig rings packed in a perforated impeller basket for the investigation of the removal of Cd 2+ from waste solution.
Study Design: The reactor was tested for Cd2+ concentration removed, the diameter of Zinc Raschig rings, and the rotational speed of the basket.
Methodology: The results indicate that there are two rates of cementation for Cd-Zn system, a high rate at the beginning, followed by a lower rate after the initial period. The results also show that percentage removal of Cd2+ ions from solution increases by increasing the speed of basket rotation, and as the diameter of Zn Raschig ring packed in the basket reactor, increases the removal of Cd2+ decreases. The cadmium deposits on zinc as powder.
Results: The removal of Cd2+ is optimum for ring diameter of 0.5 cm, initial concentration of 100 ppm, and basket rotation speed of 500 rpm. The experimental data fit the following equation: Sh=0.041 Sc0.33Re0.40.
This equation can be used for the design scale-up and operation of reactors used to remove Cd2+ from wastewater by cementation.
Conclusion: Rates of cementation were expressed in terms of the rate of mass transfer, the mass transfer coefficient increases as the rotational speed of the basket increases.