Abstract: A process for the production of cobalt concentrate from an ore containing metal sulfides including sulfides of lead, zinc, and cobalt. The ore is crushed and subjected to a lead and cobalt flotation to separate the lead and cobalt from the zinc and produce a bulk lead cobalt concentrate. The lead cobalt concentrate is then subjected to a cobalt flotation to separate the cobalt from the lead and produce a cobalt concentrate.

Abstract: A composite lead sheet product comprising a layer of lead or lead alloy having first and second surfaces. A first layer of a porous, non-metallic material is mechanically bonded to the first surface of the lead layer, and a second layer of porous, non-metallic material is mechanically bonded to the second surface of the lead layer. The method of making the composite of this invention comprises supporting a first layer of a porous, non-metallic sheet material on a heat sink. Molten lead or lead alloy is dispensed transversely across the first layer. A second layer of a porous, non-metallic sheet material is applied over the dispensed molten lead. The second layer is pressed into the molten lead, and the molten lead is pressed into the first layer with a roller, to mechanically bond the first and second layers to the lead.

Abstract: A sequential flotation process for the separation of components of an ore containing sulfides of copper and molybdenum involves initially effecting selective flotation of the copper component directly from the ore by conditioning the ore with a combination of a source of bisulfite ion and causticized starch to produce a conditioned ore having a pH between approximately 5.2 and 6.2, and thereafter treating the conditioned ore with a collector selected from the group consisting of dialkyl dithiophosphates and alkyl dithiophosphinates.

Abstract: A sequential flotation process for the separation of components of a sulfide ore selected from the group consisting of copper and lead sulfide containing ores and copper, zinc and lead sulfide containing ores in which the copper component is initially selectively floated directly from said ore by conditioning the ore with a combination of a source of bisulfite ion and causticized starch to produce a conditioned ore having a pH between approximately 5.7 and 6.5, and thereafter treating the conditioned ore with a collector selected from the group consisting of dialkyl dithiophosphates and alkyl dithiophosphinates.

Abstract: A method of alloying powdered aluminum into lead to form lead-calcium-aluminum alloys with relatively high recoveries and low standard deviations of recoveries. The method comprises melting lead, heating the lead, injecting simultaneously calcium-containing granules and aluminum powder into the lead under the surface. The alloying material preferably has a total calcuim content of between about 65% and 80% by weight and a total aluminum content of between about 35% and 20%. The material is preferably injected into an injection bell to hold the alloying material under the surface of the lead.