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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 It might be outdated or ideologically biased.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 VOC concentrator refers to the activated zeolite or carbon adsorption system, are designed to capture and eliminate volatile organic compounds (VOCs) and hazardous air pollutants from industrial exhaust systems.
From Credits to Concentrators. The trends in CTE course taking are clear, but average course taking may be a poor barometer of meaningful CTE participation because haphazard CTE course taking may not deliver coherent labor force preparation.
According to him, 'some of our patients are indigent and cannot afford oxygen from the oxygen cylinder, so we have this system called oxygen concentrator which basically concentrates oxygen in the air from about 23 per cent to at least 85 per cent by removing nitrogen.
The dish concentrator via an elevation-azimuth double-axis tracking device (EATD) was used to accurately track the sun's position so it could focus the sunlight to the precalculated position of the receiver [10-12].
While it might seem like a logical plan, the Inogen concentrators aren't practical for remote mounting because they require a key press to power on and off, plus the operator needs to have access to the front panel display.
Makers of the LifeChoice ActiVox Portable Oxygen Concentrator, Inova Labs, has patented innovative oxygen conservation technologies called Pulse-Wave Delivery and Auto Mode Technology.
Even if we only use partial properties of the coordinate transformation compared with that for a strict invisible cloak or a concentrator, the effects of magnetic concentrator made of such metamaterials still hold.
The researchers say their concentrator will need further development to produce enough energy to be commercially viable, as its current efficiency is around 1%.
There are only a few solar concentrator plants in the world, mainly because these multi-mirrored solar power production facilities require giant chunks of land and hefty investments.
Through observing and comparing a variety of concentrators and flowers, many similarities between solar concentrators and flower structures were found.
The purpose of this project was to investigate electrical power generation of a solar-powered Stirling engine fitted with lightweight thin-film and acrylic concentrators. The concentrators provide focused solar energy to heat the engine, and enable the system to be lightweight.
Steve McGrew, a pioneer in the theory of holographic solar concentrators, looks at how they could help improve the efficiency of solar cells.