Because metallic minerals have higher specific gravities than most gangue ( waste ) minerals, concentrating the milling ore was done in various gravity classifiers.
32.
"' N'Gangue M'voumbe Niambi "'was the king of Portuguese slave trade, which had recently begun.
33.
As most ores are impure, it is often necessary to use flux, such as limestone, to remove the accompanying rock gangue as slag.
34.
William Haynes patented a process in 1869 for separating sulfide and gangue minerals using oil and called it " bulk-oil flotation ".
35.
This ore has a similar specific gravity to cassiterite and the normal methods used for separating the ore from gangue could not separate these two minerals.
36.
For most base metal shows, the rock would have been mined by hand and crushed on site, the ore separated from the gangue by hand.
37.
Early production was of the oxidized zone, where the galena was altered to cerussite and anglesite in a gangue of limonite, goethite, and calcite.
38.
Unlike blast furnace pig iron, which is almost pure metal, DRI contains some siliceous gangue, which needs to be removed in the steel-making process.
39.
Gangue minerals are typically some form of iron oxide mineral, classically hematite, but also magnetite within some other examples such as Ernest Henry and some Argentinian examples.
40.
The gangue minerals of barite and silica generally do not contain rare earth inclusions and have discrete grain boundaries with bastnaesite, indicating that grinding will separate these minerals.
