title: Recovery of nickel oxide from spent catalyst.
abstract: This study investigates the possibility of recovering nickel from the spent catalyst (NiO/Al2O3) resulting from the steam reforming process to produce water gas (H2/H2O) in many industries. In the extraction process, nickel is recovered as sulfate using sulfuric acid as a solvent. The considered parameters affecting nickel recovery were acid concentration, temperature and time of digestion solid:liquid ratio, particle size and stirring rate. Nickel was to be directly recovered as a sulfate salt by direct crystallization method. The conversion was 99% at 50% sulfuric acid concentration, solid: liquid ratio (1:12) by weight, particle size less than 500 micron for more than 5 h and 800 rpm at 100 degrees C.
authors.affiliation: Chemical Engineering Department, Faculty of Engineering, Cairo University, Giza, Egypt.
authors.forename: N M
authors.initials: NM
authors.lastname: Al-Mansi
authors.forename: Monem N M
authors.initials: MN
authors.lastname: Abdel
mesh_terms: D002384:Catalysis; D003247:Conservation of Natural Resources; D005740:Gases; D007220:Industrial Waste; D009532:Nickel / Q000737:chemistry*; D012997:Solvents; D013696:Temperature; D014867:Water
chemical_list: D005740:Gases; D007220:Industrial Waste; D012997:Solvents; D014867:Water; D009532:Nickel; C028007:nickel monoxide