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To increase the amount of a dissolved substance by evaporation.
(mining engineering)
To separate ore or metal from its containing rock or earth.
The clean product recovered in froth flotation or other methods of mineral separation.



(in mining), a product of mineral dressing that is more suitable for use or further processing than the initial raw material. In most cases, direct use of the extracted rock or its metallurgical or chemical processing is economically unfeasible and sometimes even technically impossible. A concentrate may have a high content of a valuable component (such as a metal), a small quantity of impurities (for example, iron and titanium in glass sand), or the required size (graded anthracite).

The quality of concentrates is regulated by government standards or by technical specifications that determine the size and the content of valuable components, undesirable impurities, and moisture. For example, concentrate must contain Pb > 70 percent, SiO2 < 2 percent, Cu < 1.5 percent, Zn < 2.5 percent, and Fe < 8 percent for lead hearth smelting and Pb > 30 percent, Cu < 4 percent, and Zn < 12 percent for shaft smelting.

A distinction is made among preconcentrate (coarse or crude concentrate), which is subjected to further dressing; bulk concentrate, which contains several valuable components; and final concentrate. In most cases, concentrate is a raw material for metallurgical, chemical, and other production processes.

References in periodicals archive ?
What is unique about Christ's priesthood is that he is both priest and victim, and the meaning of the ministerial priesthood is entirely concentrated in the priesthood of Christ, which in turn is concentrated upon his offering of himself on Calvary.
In my first effort, in the 10th anniversary issue, I concentrated upon the problematics of social history: what do historians regard as a problem worthy of attention?
Fiori Musicali have concentrated upon early chamber music in the past.
The 16 evaluation flights concentrated upon the F-15E's air-to-air and air-to-ground attack capabilities and characteristics while employing the APG-63(V)1 radar upgrade.
Labour history in Africa has focused on men's labour because it has concentrated upon wage labour, a labour market in which only a small proportion of African women participate.
I was looking for a face like mine, for a mark like mine, but I had no idea how I would look at an advanced age so it was the birthmark I concentrated upon and, since I had seen no photographs of my father (nor have I ever done) I had in mind a kind of stereotype of evil - there is no other word - and somehow this was concentrated upon the mouth.