Heavy metals adsorption on rolling mill scale
Keywords:Rolling mill scale, Adsorption, Heavy metals, Adsorption isothems, Recovery
A great quantity of industries are responsibles for contaminating the environment with the heavy metals which are containing in their wastewaters. The recovery of these metals is both from an environmental and economical points of view of the upmost interest. A study is made of the use of mill scale -originating in the hot rolling of steel- as an adsorbent for the removal of heavy metals from liquid effluents. The adsorption of Zn+2, Cd+2 y Pb+2 on the rolling mill scale was investigated by determination of adsorption isotherms. The effect of time, equilibrium temperature and concentration of metal solution on mill scale adsorption efficiency was evaluated. The adsorption process was analysed using the theories of Langmuir and Freundlich. Desorption process of metals from loaded mill scales was also studied using several desorbent at different experimental conditions. It has been proved that the mill scale is an effective adsorbent for the cations studied in aqueous solutions within the range of the working concentrations.
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