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US 5,496,462 AGranted
Process for obtaining a fine powder of dendritic cadmium
AssigneeMetaleurop S.A.
InventorLuc Albert
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Abstract
The invention relates to a process for obtaining a fine powder of dendritic cadmium, characterized in that it comprises the following steps: (a) electrolytic production of cadmium metal on an electrode, under conditions such that there is formed a sponge consisting of tangled polymorphic dendrites, (b) removal and washing of the sponge, (c) disintegration of the sponge in a pulpy medium under conditions such that the dendrites are released in order to obtain a dendritic powder of particle size essentially less than a specified limit.
Claims6
A process for obtaining a fine powder containing dendritic cadmium, comprising the following steps:
- (a) electrolytic production of metallic cadmium on an electrode, with a current density (J) between 700 and 1500 A/m.sup.2, with a cadmium concentration (CD) in the electrolyte between 3.5 and 15 kg/m.sup.3, and with an electrolytic solution composed of cadmium sulfate and sulfuric acid, the sulfuric acid content being between 5 and 100 g/I, and wherein the cadmium concentration in the electrolyte is specified by the relationship:
- 100 A.m/kg.ltoreq.J/CD.ltoreq.200A.m/kg
- whereby a sponge consisting of tangled polymorphic dendrites is formed,
- (b) removal and washing of the sponge,
- (c) disintegration of the sponge in a protective pulpy medium comprising approximately 50 to 200 g of cadmium sponge per liter of solution, said disintegration being performed in a disintegration tank having a peripheral motor-driven agitation device, the shape and speed of said device being chosen so as to obtain a dendritic powder, and
- (d) drying the pulp.
3 more elements
Dependencies are inferred from the claim text.