Laminated high-density spheroidic cobalt oxyhydroxide precursor and preparation method thereof
A cobalt oxyhydroxide, quasi-spherical technology, applied in chemical instruments and methods, cobalt oxide/cobalt hydroxide, cobalt compounds, etc., can solve the problems of uneven downstream mixing, non-spherical morphology, poor product stability, etc. Achieve controllable particle size and morphology, avoid incomplete cobalt oxidation, and low cost
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Embodiment 1
[0038] Prepare a cobalt sulfate solution with a cobalt ion concentration of 2mol / L, add 0.4g / L disodium edetate to the cobalt sulfate solution, and prepare a 10mol / L sodium hydroxide solution as a precipitant. Add 60L of pure water to a reactor with a capacity of 100L, control the temperature at 70°C, adjust the pH value to 11.0 with sodium hydroxide solution, stir at a speed of 550r / min, and keep feeding the reactor at a flow rate of 50L / h Inject air for 2h;
[0039] In the nucleation stage, the temperature is controlled at 70°C, the pH value is controlled at 10.7-11.0, the stirring speed is controlled at 550r / min, the cobalt salt feed flow is controlled at 4.5L / h, and the air flow is controlled at 120-200L / h. After the particles grow to 2.5 μm, switch the reaction conditions and enter the growth stage. In the growth stage, the temperature is controlled at 75°C, the pH value is controlled at 11.0-11.4, the stirring speed is controlled at 650r / min, the cobalt salt feed flow r...
Embodiment 2
[0047] Prepare a cobalt chloride solution with a metal concentration of 1.8mol / L, add 0.5g / L ethylenediaminetetraacetic acid to the cobalt chloride solution, and prepare an 8mol / L sodium hydroxide solution as a precipitant. Add 60L of pure water to a reactor with a capacity of 100L, control the temperature at 65°C, adjust the pH value to 10.85 with sodium hydroxide solution, stir at a speed of 500r / min, and keep feeding the reactor at a flow rate of 30L / h Inject air for 4h;
[0048] In the nucleation stage, the temperature is controlled at 60°C, the pH value is controlled at 10.7-11.0, the stirring speed is controlled at 500r / min, the cobalt salt feed flow rate is controlled at 4.0L / h, and the air flow rate is controlled at 120-200L / h. After the particles grow to 2.0 μm, switch the reaction conditions and enter the growth stage. In the growth stage, the temperature is controlled at 78°C, the pH value is controlled at 11.0-11.4, the stirring speed is controlled at 650r / min, th...
Embodiment 3
[0051] Prepare a cobalt chloride solution with a metal concentration of 2.2mol / L, add 1.0g / L disodium edetate to the cobalt chloride solution, and prepare a 5mol / L potassium hydroxide solution as a precipitant. Add 60L of pure water to a reactor with a volume of 100L, control the temperature at 68°C, adjust the pH value to 11.0 with potassium hydroxide solution, stir at a speed of 500r / min, and keep feeding the reactor at a flow rate of 20L / h Introduce oxygen for 1h;
[0052] In the nucleation stage, the temperature is controlled at 68°C, the pH value is controlled at 10.7-11.0, the stirring speed is controlled at 500r / min, the cobalt salt feed flow rate is controlled at 4.0L / h, and the oxygen flow rate is controlled at 120-200L / h. After the particles grow to 2.0 μm, switch the reaction conditions and enter the growth stage. In the growth stage, the temperature is controlled at 75°C, the pH value is controlled at 11.0-11.4, the stirring speed is controlled at 650r / min, the co...
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