title: Extraction of nickel from spent catalyst using fresh and recovered EDTA.
abstract: This study investigates the possibility of recovering nickel from spent catalyst (NiO/Al(2)O(3)) used in the fertilizer industry. EDTA (ethylenediaminetetraaceticacid) di sodium salt was used as a chelating to extract the Ni after which sulfuric acid was added to obtain NiSO(4). The dechelation process takes 5-6h to break the complex and EDTA which was recovered as H(4)EDTA acid in the solid form and solution contains NiSO(4). The objective was to evaluate the nickel removal efficiency of EDTA and reusability of recovered EDTA. The parameters affecting nickel recovery were EDTA concentration, time of chelation, catalyst to liquid ratio (s:l), mixing speed, pH and catalyst particle size. The extraction was up to 95% under the following conditions: 0.8M concentration of EDTA, solid to liquid ratio 1:50 (g/ml), particle size 100 microm, pH 10, 10h of chelation time, 700 rpm and 100 degrees C. Up to 95% of the EDTA could be recovered without losing significant activity.
authors: Department of Chemical Engineering, Indian Institute of Technology, Hauz Khas, New Delhi 110013, India. shinaiitd@gmail.com
authors: Shina
authors: S
authors: Goel
authors: K K
authors: KK
authors: Pant
authors: K D P
authors: KD
authors: Nigam
mesh_terms: D002384:Catalysis; D002614:Chelating Agents / Q000737:chemistry*; D004492:Edetic Acid / Q000737:chemistry*; D005308:Fertilizers; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D009532:Nickel / Q000032:analysis / Q000302:isolation & purification*; D010316:Particle Size; D017550:Spectroscopy, Fourier Transform Infrared; D013818:Thermogravimetry; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*
chemical_list: D002614:Chelating Agents; D005308:Fertilizers; D014874:Water Pollutants, Chemical; D009532:Nickel; D004492:Edetic Acid