Gulin® is a leading cobalt grinding mill manufacturer in China, and we supply cobalt ball mill, cobalt vertical mill, cobalt thin mill, we provide you with a free installation service, our technical staff will help you better use the machine.
Cobalt Grinding Mills
Cobalt Grinding Mills
Ball mill is earlist grinding mill machine. The main advantage of it is high yield and throughput. Ball mill is mainly used in mineral ore (such as: copper, cobalt, iron, gold) concentration and cement grinding plant.
cobalt vertical mill is the main coal mill used in coal preparation plant, and adopts reliable structure and reasonable process flow integrated with drying, milling, classifier, elevator. After in combination with the European technology and the market demand, our vertical mill can fully meet the requirement of clients in the high production of powder.
Cobalt thin grinding mill is a ultra fine powder machine, and is designed based on more than 15 years’ production experience of our company, we absorb technology advantages from the same field abroad and domestic, organizing elite powder processing experts to investigate, research, try again and again; finally, we develop this high-efficiency and low-cost SCM Series Thin Grinding Mill.
Cobalt extraction techniques
The ores are treated by a sulfating roast in a fluidized bed furnace to convert copper and cobalt sulfides into soluble oxides and iron into insoluble hematite. The calcite is subsequently leached with sulfuric acid from the spent copper recovery electrolyte. Oxide concentrates are introduced at this leaching step to maintain the acid balance in the circuit. Iron and aluminum are removed from the leach solution by the addition of lime, and copper is electro won on copper cathodes. A part of the spent electrolyte enters the cobalt recovery circuit and is purified by the removal of iron, copper, nickel, and zinc prior to the precipitation of cobalt as its hydroxide. This is accomplished by the addition of more lime to raise the pH until the remaining copper precipitates. This copper is sent back to the copper circuit. As more lime is then added, a copper-cobaltite precipitates and is fed back to the leaching process. Sodium hydrosulfide (NaHS) is added (along with some metallic cobalt as a catalyst) to precipitate nickel sulfide (NiS). Hydrogen sulfide (H2S) and sodium carbonate (Na2CO3) are then added to precipitate zinc sulfide (ZnS). Lime is then added to saturation to precipitate cobalt (II) hydroxide (Co(OH)2). In the final stages, this cobalt hydroxide is redissolved and the metal is refined by electrolysis. The resulting cobalt cathodes are crushed and vacuum degassed to obtain a pure cobalt metal.