Provided is a copper powder which can be suitably utilized in applications such as an electrically conductive paste and an electromagnetic wave shield. A copper powder according to the present invention has a dendritic shape having a linearly grown main stem and a plurality of branches separated from the main stem, the main stem and the branches are constituted as flat plate-shaped copper particles having a cross-sectional average thickness of from 0.02 m to 5.0 m to be determined by scanning electron microscopic SEM observation gather, the average particle diameter D50 of the copper powder is from 1.0 m to 100 m, and the maximum height in the vertical direction with respect to the flat plate-shaped surface of the copper particles is 1/10 or less with respect to the maximum length in the horizontal direction of the flat plate-shaped surface of the copper particles.

Provided is a copper powder which can be suitably utilized in applications such as an electrically conductive paste and an electromagnetic wave shield. A copper powder according to the present invention has a dendritic shape having a linearly grown main stem and a plurality of branches separated from the main stem, the main stem and the branches are constituted as flat plate-shaped copper particles having a cross-sectional average thickness of from 0.02 m to 5.0 m to be determined by scanning electron microscopic SEM observation gather, the average particle diameter D50 of the copper powder is from 1.0 m to 100 m, and the maximum height in the vertical direction with respect to the flat plate-shaped surface of the copper particles is 1/10 or less with respect to the maximum length in the horizontal direction of the flat plate-shaped surface of the copper particles.

The inventive subject matter is directed to continuous electrochemical production of highly pure micro- or nanostructured lead that at least partially encloses the electroprocessing solvent and molecular hydrogen and optional guest compounds to form a mixed matrix. Such compositions are particularly suitable for cold forming of various structures and/or for alloy and composite material production.

The inventive subject matter is directed to continuous electrochemical production of highly pure micro- or nanostructured lead that at least partially encloses the electroprocessing solvent and molecular hydrogen and optional guest compounds to form a mixed matrix. Such compositions are particularly suitable for cold forming of various structures and/or for alloy and composite material production.

The invention relates to a method for recovery of Nd.sub.2Fe.sub.14B grains from bulk sintered NdFeB magnets and/or magnet scraps. In this method the NdFeB magnets (1) and/or magnet scraps are anodically oxidized using a non-aqueous liquid electrolyte (5), said anodic oxidation releasing the Nd.sub.2Fe.sub.14B grains (6) in said NdFeB magnets (1) and/or magnet scraps. The released Nd.sub.2Fe.sub.14B grains (6) are collected during and/or after said anodic oxidation. The proposed method allows a more environmental friendly and cost-effective way for recycling EOL NdFeB magnets/NdFeB magnet scraps.

Lead from lead acid battery scrap is recovered in two separate production streams as clean grid lead and as high-purity lead without smelting. In preferred aspects, lead recovery is performed in a continuous process that uses an aqueous electroprocessing solvent and electro-refining, and spent electroprocessing solvent can be recycled to the recovery process.

Lead from lead acid battery scrap is recovered in two separate production streams as clean grid lead and as high-purity lead without smelting. In preferred aspects, lead recovery is performed in a continuous process that uses an aqueous electroprocessing solvent and electro-refining, and spent electroprocessing solvent can be recycled to the recovery process.

Provided is a silver-coated copper powder which can be utilized as an electrically conductive paste and an electromagnetic wave shield. A silver-coated copper powder has a dendritic shape having a linearly grown main stem and a plurality of branches separated from the main stem, the main stem and the branches are constituted as flat plate-shaped copper particles having a cross-sectional average thickness of from 0.02 m to 5.0 m to be determined by scanning electron microscopic (SEM) observation gather, the surface of the copper particles is coated with silver, the average particle diameter (D50) of the silver-coated copper powder 1 is from 1.0 m to 100 m, and the maximum height in the vertical direction with respect to the flat plate-shaped surface of the copper particles is 1/10 or less with respect to the maximum length in the horizontal direction of the flat plate-shaped surface of the copper particles.

Provided is a silver-coated copper powder which can be utilized as an electrically conductive paste and an electromagnetic wave shield. A silver-coated copper powder has a dendritic shape having a linearly grown main stem and a plurality of branches separated from the main stem, the main stem and the branches are constituted as flat plate-shaped copper particles having a cross-sectional average thickness of from 0.02 m to 5.0 m to be determined by scanning electron microscopic (SEM) observation gather, the surface of the copper particles is coated with silver, the average particle diameter (D50) of the silver-coated copper powder 1 is from 1.0 m to 100 m, and the maximum height in the vertical direction with respect to the flat plate-shaped surface of the copper particles is 1/10 or less with respect to the maximum length in the horizontal direction of the flat plate-shaped surface of the copper particles.

A process for preparing lead by electroreduction with an ammonium chloride and an ammonia is disclosed. In the process, an ammonium chloride aqueous solution is used as an electrolyte, a lead compound is used as a raw material, titanium is used as an anode, stainless steel or lead is used as a cathode, and a direct-current electric field is applied in an electrolytic bath; the lead compound is reduced to metal lead after obtaining electrons at the cathode; and at the anode, ammonia is oxidized to nitrogen for escaping, and H.sup.+ ions are generated simultaneously; sulfate radical ions and chloride ions in the lead compound enter the solution to form ammonium sulfate and ammonium chloride; and the lead monoxide and lead dioxide in the lead compound are reduced to a metal lead and OH.sup. ions are simultaneously released to combine with the H.sup.+ ions to form water.