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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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
To maximize all of these opportunities, policy has to concentrate upon the right property and infrastructure investment, and despite the cull of regional public bodies, a consensus has to be arrived at on a regional basis to deliver this.
The 4-3 penalty shoot-out defeat at Atherstone on Tuesday night ended Boro's hopes of lifting a cup trophy this term with just the BGB Southern League Midlands Division to concentrate upon over the next six months.
Orchestral colourings are obviously lost, and these performers wisely do little to attempt to recreate them; instead they concentrate upon texture and clarity, and the results are gripping.
'I am perfectly happy with my decision to concentrate upon my athletics career.
The Governor said that there is also the need to concentrate upon training and coaching of young players and enable them to achieve worthwhile laurels at the national games.
"But given this result he may now be able to place the matter behind him and concentrate upon his future.
It is surely incumbent upon our politicians to concentrate upon what can be done to address the economic, social and educational vicissitudes even more apparent in Wales than elsewhere in the UK.
The reporting and stories concentrate upon the low price of beers and so on.
The RAC says that the rise in UK motoring offences is because police concentrate upon those that are easiest to enforce, such as speeding, parking and the use of mobile phones.
It must be something to do with the concert-hall ambience, where an audience will actually concentrate upon every note delivered.
PTEA leaders demanded that Government should concentrate upon some truly visionary steps and address genuine concerns of the industry with innovation and extraordinary solutions in the upcoming textile policy.
The Governor asked the cadets to concentrate upon their academic and non-academic pursuits in order to prove themselves as real role models for the generations to come.

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