Magnetic polymeric matrixces were synthesized from glycidyl methacrylate, N,N′-methylenebis(acrylamide) (MBA), and nanomagnetite particles. The obtained polymers were modified by ethylenediamine (DA) and diethylenetriamine (TA) to produce two amino-magnetic resins named R-DA and R-TA. The recovery of Th(IV) ions from their aqueous solutions by R-DA and R-TA were studied in the pH range 1−4. Maximum adsorption capacity values of 60 and 84 mg/g of Th(IV) ions on R-DA and R-TA, respectively, were obtained at pH 3.5 and 293 K. At a solid/liquid ratio (S/L) of 2 g/L, recovery efficiency values of 86 and 95% were achieved from initial thorium ion concentration of 100 mg/L using R-DA and R-TA, respectively. Adsorption isotherms and kinetic and thermodynamic parameters of the adsorption process were obtained and analyzed. Regeneration of the resins was tested by eluting the loaded Th(IV) ions on the spent resins using 0.2 M HNO 3 followed by washing with dilute NaOH.

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The Al 2 O 3 -SiO 2 -BFS (AS-BFS) solid adsorbent was developed from blast furnace slag (BFS). The potentiality of the AS-BFS for uranium ion removal from an aqueous medium, via the batch method, was explored and disused in terms of dynamic and isothermal properties. The sorbent exhibited good reusability, a high capacity for uranium ions, and a good specific surface area. The results showed that the sorbent evacuated uranium at about 88.5 mg/g. The sorbent represents a promising waste-derived substitute for other sorbents for water treatment.

Generally the metallurgical industries generate huge amounts of harmful environmental wastes, which may be solids, liquids or gases in their nature. The present study aims to recovery sulfuric acid (227 g/l) from wastes generated during hydrometallurgical digestion of titanium ores with sulfuric acid for TiO 2 production. For this purpose Alamine 336/kerosene solvent was used. Various extraction parameters as Alamine 336 concentration, shaking time, type of diluent, O/A phase ratio were studied and optimized.Under the optimum conditions, Mc-Cabe Thiele diagram results indicated that, after 4 extraction stages the acid concentration in aqueous phase was reduced from the initial value of 227 g/l to about 17g/l. Stripping of the loaded sulfuric acid from the organic phase was done with warm water (60 ºC). Stripping parameters as water temperature, stripping time, A/O phase ratio were studied. Under the stripping the loaded acid concentration in organic phase was reduced from 210 g/l to 6 g/l which matched theoretically by McCabe Thiele diagram.

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The stainless steel waste solutions, produced during the electroplating process, were found to contain high chromium content (43.52 g/L). To avoid environmental chromium contamination and chromium toxicity, these wastes must be treated. In this work, new surface‐modified porous poly‐2‐((methacryloxy)‐methyl)‐oxirane polymers were synthesized, characterized, and then used to recover Cr (VI) from electroplating waste solution. Based on the obtained results, Cr(VI) adsorption improved with time and initial metal ion concentration. The results indicate a favourable chemisorption process controlled by pseudo second‐order rate and intraparticle diffusion mechanisms. The used polymers are capable of disposing of Cr(VI) species from wastewater with a maximum adsorption capacity of 4.21 and 5.31 mmol/g for RI@EDA and HCl@RI@EDA, respectively. The used resins showed superior affinity and efficiency in removing Cr(VI) from the electroplating waste solution.

Chemical, mineralogical and radiometric investigation studies were executed on a representative phosphorite sample collected from El-Sibaiya East area to evaluate its suitability for the alkaline leaching of its uranium content. The uranium alkaline leaching was carried out in three phases using Na 2 CO 3 and a mixture of Na 2 CO 3 / NaHCO 3 with/without an oxidant (Na 2 O 2 ). Factors include; Na 2 CO 3 , NaHCO 3 , Na 2 O 2 concentrations; digestion temperature, reaction time and ore fineness were studied and optimized. The results pointed to that the best leaching efficiency of uranium (83.2%) was conducted using the mixture solution of Na 2 CO 3 /NaHCO 3 (0.5M) in the presence of 2.5% Na 2 O 2 (w/w). The other conditions affected the leaching process were studied and optimized as 80 o C (leaching temperature), 3h (leaching time), 44μm (ore grain size) and a solid/liquid ratio of 2/25. The leached uranium was recovered by precipitation using NaOH solution where the precipitated product was defined by the XRD as sodium diuranate (Na 2 U 2 O 7 ) of high purity.

Effect of cobalt manganese ferrite nanoparticles (M-NPs) (Co0.5Mn0.5Fe2O4) on vanadium hazards was assessment in the present study. Four groups of adult male albino rats [control group and three variably treated groups with ammonium metavanadate accompanied with or without cobalt M-NPs] were studied. The oral administration of ammonium metavanadate (Am.V) (20 mg/kg b.wt.) demonstrated the facility of vanadium to distribute and accumulate in the distinctive body organs and ordered as kidney > liver > lung > brain > spleen. Also, Am.V administration induce a significant disturbance in many physiological parameters (RBS, cholesterol, triglyceride, aspartate transaminase, alanine transaminase, Alb., bilirubin, Alk.Ph., urea, creat., Hb%, red blood cell count and packed cell volume) which might be expected to the liberation of free radicals according to the vanadium intoxication or its ability to disturb many body metabolisms. On the other hand, the intraperitoneal administration of 5% M-NPs in parallel with Am.V orally administration showed the ability of M-NPs to reduce Am.V dangerous impacts, which might be resulted from the essentiality of M-NPs metals to the body metabolism and to its free radicals scavenging properties. So, M-NPs could reduce Am.V hazardous effects.