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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 It might be outdated or ideologically biased.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 ?
The PCC earlier announced a launch of an assessment on whether the power plants' outages were manipulated to increase electricity prices or were valid unplanned breakdowns that affect supply conditions.
According to Bernabe, the cement cartel investigation is still ongoing with the PCC's Enforcement Office, which is in charge of the investigation.
He said the PCC required Grab to submit data that covered the period after the transaction was made in March.
PCCs are required to swear an oath of impartiality when they are elected to office.
None of Delaney, Palmer or Wolfenbarger currently serves on PCC's board of directors and PCC does not intend to nominate replacement directors for election at the annual meeting in their place.
Commenting on the announcement, Kent Lawson, Chairman and CEO of PCC, said, "As smart devices' adoption continues to explode, PCC is very pleased to formally announce our partnering initiative for all companies looking to secure and optimize user experiences in a mobile first world.
Of the 2,875 veterans enrolled between fall 2010 and fall 2012, at least 767 had errors in their files, PCC said in its written response to the VA.
We are obviously pleased that there is public confidence in the PCC but are not complacent and would welcome the chance to talk to Tom Watson and inform him about the work of the PCC.
According to PCC, disclosure of some food ingredients, such as specific oils or spices, and the source of colors or flavors are not required by law to be identified fully on food products.
The recent adoption of AASHTO specifications on glass cullet (M-318-01) and reclaimed PCC (M-319-02) for granular base course is evidence of the widespread support for recycled material aggregates.
Over the years PCC backward integrated into producing nonwovens for the interlining trade as well as industrial markets and forward integrated to produce composites for both markets.