Abstract: Lead is recovered from sulfide ores which contain lead by leaching the ore with fluosilicic acid to form elemental sulfur and lead fluosilicate, and then subjecting the lead fluosilicate to electrolysis to produce lead and fluosilicic acid.

Abstract: Lead is electrowon from aqueous phosphorus-containing fluosilicic acid solution by deposition on a lead cathode, employing an anode comprising a titanium substrate and an electrodeposited lead oxide coating having a uniform, dense grain size and structure.

Abstract: A powder agglomerator and its method of use. The invention is used to take extremely fine flue dust particles in a collection bin and process them before sending the resultant agglomeration to storage or a further processing location. From its collection bin, the dust particles are discharged by gravity upon a lower rapidly rotating smooth horizontal disc. The bin discharge is offset slightly from the disc's center so that the particles are subjected to centrifugal force to move them to the disc's outer periphery. At the point where the particles are discharged on the disc, a liquid binder, like water, is sprayed on the particles to cause them to begin to agglomerate. After being sprayed, the wetted particles are agglomerated under the influence of centrifugal and tangential forces. When they reach the disc's raised edge, the particles are completely agglomerated at which time they fall over the edge into a discharge hopper located below.

Abstract: A method of agglomerating fine ore powders. The invention is used to agglomerate extremely fine flue dust particles in a collection bin and process them before sending the resultant agglomeration to storage or a further processing location. From its collection bin, the dust particles are discharged by gravity upon a lower rapidly rotating smooth horizontal disc. The bin discharge is offset slightly from the disc's center so that the particles are subjected to centrifugal force to move them to the disc's outer periphery. At the point where the particles are discharged on the disc, a liquid binder, like water, is sprayed on the particles to cause them to begin to agglomerate. After being sprayed, the wetted particles are agglomerated under the influence of centrifugal and tangential forces. A scraper may be used to aid in pushing the particles towards the disc's raised outer edge.

Abstract: A process is provided for recovering metals from metal-containing slags such as iron-copper slags from copper smelting furnaces and iron-nickel slags produced in smelting nickel-bearing ores. The molten slag is fed to an electric-arc furnace wherein a molten metal bath is formed. A carbon injection unit, including an injector tube which is inserted into the furnace, is used to inject carbon into the bottom of the molten metal bath. A flux, such as CaO, is also fed, as needed, to the bath. After reduction, the metal product is tapped from the furnace.