Electrochemical synthesis of nickel-aluminium oxide system from metals obtained by ore processing

19th International Scientific Symposium in honor of Academician M.A. Usov "Problems of Geology and Subsurface Development"

Korobochkin, V.V.^1 ; Usoltseva, N.V.^1 ; Shorokhov, K.G.^1 ; Popova, E.V.^1

Department of Chemical Engineering, National Research Tomsk Polytechnic University, 30 Lenin Ave., Tomsk

634050, Russia^1

关键词: Alternating current;    Aluminium oxide;    Electrochemical synthesis;    Electrolyte solutions;    Industrial frequency;    Nickel hydroxides;    Nickel oxyhydroxides;    Oxidation rates;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/27/1/012048/pdf
DOI  :  10.1088/1755-1315/27/1/012048

来源: IOP

【 摘 要 】

Separate and combined electrochemical oxidation of aluminium and nickel has been conducted by alternating current of industrial frequency. Concentration increase of electrolyte solution (sodium chloride) in the range from 3 to 25 wt. % and current density from 0.5 to 1.5 A/cm2was found to result in the increasing metal oxidation rate, excluding aluminium oxidation which oxidation rate is independent of the electrolyte solution concentration. At the current density of 1.5 A/cm2the products of separate oxidation of nickel and aluminium are nickel oxyhydroxides, nickel hydroxides and aluminium oxyhydroxide (boehmite), respectively. In addition to these compounds, the nickel-aluminium oxide hydrate is included in the products of nickel and aluminium co-oxidation. Its content grows with the increasing electrolyte solution concentration. Varying the concentration and current density within the limits indicated, the nickel-aluminium oxide system with nickel oxide content from 3 to 10 wt. % is produced.