Pillar A block of solid ore or other rock left in place to structurally support the shaft, walls or roof of a mine. Pitchblende An important uranium ore mineral. It is black in color, possesses a characteristic greasy lustre and is highly radioactive.
Crushing, a form of comminution, one of the unit operations of mineral processing. In the field of extractive metallurgy, mineral processing, also known as ore dressing, is the process of separating commercially valuable minerals from their ores .
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If the particles are too large, unwanted accessory minerals cannot be separated from the ore. The ore concentrate obtained only has a low purity. Overgrinding, on the other hand, results in high milling costs and low throughput as well as an increased need for chemicals in flotation. Furthermore, flotation cells are sensitive to solid overloading.
the ore. In concentration the following terms are used: Head is the feed to a concentrating system. Concentrate is defined as the valuable mineral separated from ore undergoing a specific treatment. Tailing is the fraction of ore rejected in a separating process. It is usually the valueless portion, i.e. discard or waste.
The crude ore from the mines contain a number of solid phases in the form of an aggregate. The valuable portion of the ore is known as mineral while the worthless portion is known as gangue. During ore dressing, the crude ore is reduced in size to a point where each mineral grain becomes essentially free so as to make separation between them.