Isolating antimony from its oxide is performed by a carbothermal reduction: :2 + 3 C → 4 Sb + 3 The lower grade ores are reduced in blast furnaces while the higher grade ores are reduced in reverberatory furnaces.
Most antimony is mined as the sulfide; lower grade ores are concentrated by froth flotation, while higher grade ores are heated to 500 600 °C, the temperature at which stibnite melts and is separated from the gangue minerals.
Known quantity of radium from high grade ore solution was chemically separated and carefully kept inside the cavity of a Lucas Cell (LC).
Considering the present magnitude of the iron ore slimes generation annually, quantity of slime accumulated over the years, depletion of high grade ore reserves, acute shortage of land at mining lease areas and stringent government norms, these slimes can be considered as a national resource if properly beneficiated using innovative technology.
In other words, there is little high grade ore and proportionately much more low grade ore available.
The Great Dyke, which is a unique feature of Zimbabwe's geology forms the central crest stretching for 540 km in a north-northeast direction and is made up of 4 elongated lopolith mafic and ultra-mafic rocks containing high grade ores of such minerals as chrome and nickel.
In the second method, small amounts of finely ground high-grade ore are agitated in tanks by air or by mechanical impellers.
One complicating issue with phosphorus is that high-grade ore deposits are highly geographically segregated.
In the mid-1970s large deposits of bauxite were discovered in the Guiana Highlands, much of it high-grade ore suitable for alumina smelting in the Ciudad Guayana complex.
The rapid modern growth of Barrow dates from the 1840s, when ironworks were established using local high-grade ore and coke brought by rail across the Pennines.
The separation, identification and assessment of high-grade ore zones from low-grade ones are extremely important in mining of metalliferous deposits.
