US11063258B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11063258-B2 |
| Application number | US-201716307654-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 12, 2017 |
| Priority date | Jun 14, 2016 |
| Publication date | Jul 13, 2021 |
| Grant date | Jul 13, 2021 |
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A method for producing a nickel-containing hydroxide is provided that includes a particle growth step of promoting growth of nickel-containing hydroxide particles by neutralization crystallization in an aqueous solution accommodated in an agitation tank. In the particle growth step, a volume fraction of a highly supersaturated region in the aqueous solution where the molar concentration of the nickel-containing hydroxide dissolved in the aqueous solution is greater than or equal to 1.7 mol/m3 is less than 0.624% of the aqueous solution.
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The invention claimed is: 1. A method for producing a nickel-containing hydroxide, the method comprising: a nucleation step of generating nuclei of nickel-containing hydroxide particles; and a particle growth step of promoting growth of the nickel-containing hydroxide particles by neutralization crystallization in an aqueous solution accommodated in an agitation tank; wherein the agitation tank is an overflow type continuous agitation tank such that in the particle growth step, a volume fraction of a highly supersaturated region in the aqueous solution where the molar concentration of the nickel-containing hydroxide dissolved in the aqueous solution is greater than or equal to 1.7 mol/m 3 is greater than or equal to 0.019% and less than 0.624% of the aqueous solution, wherein the volume fraction of the highly supersaturated region is controlled by the following conditions in the agitation tank, a raw material liquid containing a nickel salt is mixed with an alkali metal hydroxide and an ammonia supplier to form a reaction aqueous solution; a concentration of ammonia in the reaction aqueous solution is 3 g/L to 25 g/L; a volume of the agitation tank is 60 L to 200 L; the agitation tank has a disk-blade turbine impeller or has a 45° pitched paddle blade impeller; the impeller has four to six blades; a diameter of the impeller is 160 mm to 250 mm; a vertical distance between the impeller and an inner bottom surface of the agitation tank is 60 mm to 140 mm; the agitation tank is filled with 60 L to 200 L of the reaction aqueous solution; and a feed rate of the raw material liquid supplied from a raw material liquid supply pipe is 98 mL/min to 400 mL/min. 2. The method for producing a nickel-containing hydroxide according to claim 1 , wherein the nickel-containing hydroxide is produced so as to contain Ni, Co, and Al at an amount ratio of Ni:Co:Al=(1−x−y):x:y (where 0≤x≤0.3, 0.005≤y≤0.15). 3. The method for producing a nickel-containing hydroxide according to claim 1 , wherein the nickel-containing hydroxide is produced so as to contain Ni, Co, Mn, and M (where M denotes at least one additional element selected from a group consisting of Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, and W) at an amount ratio of Ni:Co:Mn:M=x:y:z:t (where x+y+z±t=1, 0.1≤x≤0.7, 0.1≤y≤0.5, 0.1≤z≤0.8, 0≤t≤0.02).
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