Method for preparing nickel-iron oxide by using Ni-Fe alloy melt
A technology of oxides and alloys, applied in chemical instruments and methods, nickel compounds, inorganic chemistry, etc., can solve the problems of high energy consumption and cost, long production process, etc., and achieve short process, low raw material cost, and reduced energy consumption Effect
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Embodiment 1
[0025] The temperature of the Ni-Fe alloy melt is controlled at 650°C, the Ni content is 51wt%, stirred by a mechanical paddle, and spray granulated to obtain Ni-Fe particles with a particle size of about 460 μm;
[0026] Through 10h zirconia ball milling (dry milling) and sieving to obtain Ni-Fe powder with a particle size of ≤25 μm, the yield is 60%, and the coarse particles are added to the next ball mill;
[0027] The Ni-Fe powder is fluidized and roasted at 450°C in oxygen-enriched air with an oxygen concentration of 45% for 8 hours, and the particle size of the obtained nickel-iron oxide is about 30 μm, with good particle size uniformity.
[0028] After the nickel-iron oxide is prepared as an oxygen evolution electrode, in 1M KOH solution, the current density is 10mA / cm -2 , the oxygen evolution overpotential is about 405mV.
Embodiment 2
[0030] The temperature of the Ni-Fe alloy melt is controlled at 630°C, the Ni content is 42wt%, the mechanical paddle is stirred, and the Ni-Fe particles with a particle size of about 520 μm are obtained by spray granulation;
[0031] Through 12h zirconia ball milling (dry milling) and sieving to obtain Ni-Fe powder with a particle size of ≤25 μm, the yield is 55%;
[0032] The Ni-Fe powder is fluidized and roasted at 430°C in oxygen-enriched air with an oxygen concentration of 45% for 8 hours, and the particle size of the obtained nickel-iron oxide is about 32 μm, with good particle size uniformity.
[0033] After the nickel-iron oxide is prepared as an oxygen evolution electrode, in 1M KOH solution, the current density reaches 10mA / cm -2 , the oxygen evolution overpotential is about 423mV.
Embodiment 3
[0035] The temperature of the Ni-Fe alloy melt is controlled at 650°C, the Ni content is 49wt%, the mechanical paddle is stirred, and the Ni-Fe particles with a particle size of about 430 μm are obtained by spray granulation;
[0036] Obtain Ni-Fe powder with a particle size of ≤25 μm by 8h zirconia ball milling (dry milling) and sieving, with a yield of 65%;
[0037] The Ni-Fe powder is fluidized and roasted at 350°C in oxygen-enriched air with an oxygen concentration of 50% for 8 hours, and the particle size of the obtained nickel-iron oxide is about 28 μm, with good particle size uniformity.
[0038] After the nickel-iron oxide is prepared as an oxygen evolution electrode, in 1M KOH solution, the current density reaches 10mA / cm -2 , the oxygen evolution overpotential is about 398mV.
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