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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 It might be outdated or ideologically biased.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 ?
However, the Ministry of Economy stated to the financial police that it issued no permits for import and export of ore and concentrates of non-ferrous metals containing precious metals.
Note: PAIU's must only use "ANSULITE" 1% AFFF concentrate. It is recommended that 688 and TRIDENT boats without PAIU's only use Type 6 mil spec MIL-F-24385 AFFF per current allowances.
Ingenia Polymers makes IP 1080 concentrate for film with 70% CaCO3.
By dropping the temperature and drastically reducing the time spent heated, cooked flavors are avoided, and the quality of the concentrate improves significantly.
The chapter on "Provenance and crust-mantle evolution studies based on radiogenic isotopes in sedimentary rocks," by Jonathan Patchett concentrates on the use of Sm-Nd, Lu-Hf and Rb-Sr isotopic approaches to problems of sedimentary provenance, tectonic environments and crust-mantle evolution.
If so, choose a soy protein concentrate capable of being formulated to the level that delivers 6.25 mg per product serving.
Each pair of rolls contained a total of 7.5 to 15 grams of a beta-glucan concentrate. Malkki now attributes the small (about 5 percent) average cholesterol reduction observed in these men to the relatively short beta-glucan chains used in the concentrate, and says he expects better results from formulations with longer chains.
Custom-formulated concentrates for most thermoplastics can include a nontoxic blowing agent for food-contact applications and can contain color and other additives.
The article recounted that San Joaquin valley grape growers once viewed concentrate as market for surplus grapes, just as dessert/aperitif wines once were used to sop up grapes not used for raisins or table grapes.
"Real fruit juice concentrate is a pain in the butt," says Frookies' Rich Worth.
In Winston's design, a parabolic mirror focuses light into a roughly cone-shaped "light funnel" that concentrates the light further (see diagram).
Offers a universal concentrate for use in all resins, including styrenics, ABS, PE, and PP.