Hydrometallurigcal process for producing finely divided spherical precious metal based powders
First Claim
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1. A process comprising:
- (a) forming an aqueous solution containing at least one precious metal value,(b) forming a solid reducible material selected from the group consisting of precious metal salts, precious metal oxides and mixtures thereof,(c) reducing said solid material to form precious metal based particles,(d) entraining at least a portion of said precious metal particles in a carrier gas,(e) feeding said entrained particles and said carrier gas into a high temperature zone and maintaining said particles in said zone for a sufficient time to melt at least about 50% by weight of said particles, and to form droplets therefrom and(f) cooling said droplets to form precious metals based metallic particles having essentially a spherical shape and a majority of said particles having a size less than 20 micrometers.
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Abstract
A process for producing finely divided spherical precious metal based powders comprises forming an aqueous solution containing a source of at least one precious metal value forming a solid reducible precious metal material from the solution, reducing the solid material to precious metal powder particles, subjecting the precious metal based particles to a high temperature zone to melt at least a portion of the precious metal based powder particles and cooling the molten material to form essentially spherical precious metal based alloy particles.
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12 Claims
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1. A process comprising:
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(a) forming an aqueous solution containing at least one precious metal value, (b) forming a solid reducible material selected from the group consisting of precious metal salts, precious metal oxides and mixtures thereof, (c) reducing said solid material to form precious metal based particles, (d) entraining at least a portion of said precious metal particles in a carrier gas, (e) feeding said entrained particles and said carrier gas into a high temperature zone and maintaining said particles in said zone for a sufficient time to melt at least about 50% by weight of said particles, and to form droplets therefrom and (f) cooling said droplets to form precious metals based metallic particles having essentially a spherical shape and a majority of said particles having a size less than 20 micrometers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification