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US 10,537,885 B2Granted
Nickel metal particle production
AssigneeInvista North America S.A.R.L.
InventorVinay Medhekar
Life of this patent
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Abstract
Methods are described herein that involve rotating or gently mixing nickel(II)-containing particles in a reaction vessel while heating the particles and flowing a reducing atmosphere through the reaction vessel for a time sufficient to generate free-flowing nickel metal (Ni(0)) from the nickel(II)-containing particles.
Claims8
A method comprising:
- (a) calcining first nickel(II)-containing particles in an atmosphere comprising oxidizing constituents to generate second nickel(II)-containing particles;
- and
- (b) reducing the second nickel(II)-containing particles in a reducing atmosphere while rotating or turning the second nickel(II)-containing particles in a rotary processor at 275° C. to 360° C. for a time sufficient to generate a free-flowing particulate nickel metal (Ni(0)) product from the second nickel(II)-containing particles, wherein the reducing atmosphere is free of added water or steam not produced by the reducing, and wherein a H2/Ni molar ratio is employed during the reducing step of between about 1.9 and 2.5;
- wherein the free-flowing particulate nickel metal (Ni(0)) product is two to seven times more active for complexation with a monodentate phosphorus-containing ligand, a bidentate phosphorus-containing ligand, or a combination thereof, than is a nickel metal product generated by hydrogen reduction with added water or steam that is not generated by the hydrogen reduction.
1 more element
Dependencies are inferred from the claim text.