Oxide zinc ores

Oxide zinc ore with little or no lead present. 

The choice of gangue depressants is closely related to the gangue type present in the ore. Usually the oxide zinc ores have a complex gangue composition and, therefore, selection of depressants is dictated by the gangue composition present in the ore. 

Figure 20.3 Effect of type of collector on flotation of mixed oxide zinc ore.

Sulphidization - amine flotation. This method was extensively examined dating back to the 1940s and early 1950s [11], and currently is being used in almost all industrial plants treating oxidized zinc ores. Amines suitable for flotation of oxidized zinc minerals include salts of aliphatic amines, octadecyl amine and hydrooxyinolin. 

Acrylate and low-molecular-weight acrylic acids are effective slime depressants/disper-sants. Suspendol PKK and PC improved separation efficiency between zinc and iron oxides. Starches, mainly hydrolysed starch and cooked starch, are effective depressants in the treatment of oxidized zinc ores that contain iron oxides and Fe-hydroxides. 

Reagent schemes used to treat different oxidized zinc ores... 

As mentioned earlier, the selection of reagent scheme for treatment of oxidized zinc ores depends very much on the type of oxide zinc mineral present in the ore, as well as the type and consumption of gangue minerals. Table 20.13 shows some of the most commonly used... 

The Angouran mine is a very well known mine which has been exploited only at low capacities. The Angouran deposit is located in northwest Iran and is comprised of oxidized zinc ores, mainly carbonates and silicates. 

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