Gravity concentration

An estimate of the applicability of gravity concentration to the separation of a mineral pair of differing specific gravity can be obtained by making use of what is called the concentration criterion, which makes use of the ratio (p, - p2)/(p3 - p2), where pj is the specific gravity of the heavy mineral, p3 is the specific gravity of the light mineral, and p2 is the 

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Gravity concentration, ie, the separation of ore from gangue based on the differences in specific gravities, using jigs, heavy—medium separators, or spiral concentrators for example, is appHcable for lead ores. However, the predominant beneficiation technique used in modem plants is the bubble or froth flotation (qv) process (4,5). 

R. O. Butt, Gravity Concentration Technology, Elsevier, Amsterdam, the Nethedands, 1984. 

General References Apian, Gravity Concentration, in Kirk and Othmer... 

The devices used for the gravity concentration of minerals are many in number. Typical examples include devices such as jigs, spirals, tables, and heavy medium separators. 

The beneficiation of this ore type usually involves a combination of gravity concentration, cyanidation and flotation. For an ore with coarse gold, gold is often recovered by gravity and flotation, followed by cyanidation of the reground flotation concentrate. In... 

Beneficiation of tin ores exclusively includes a combination of gravity preconcentration and flotation, where the flotation includes (a) flotation of sulphides from the gravity concentrate and (b) flotation of sulphides from the fines, followed by tin flotation from the sulphide tailing after desliming. 

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