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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 ?
It is better to acquire a reputation for one or two factors which are important to customers and to concentrate upon developing those.
Following the events of September 11th in the United States and the consequent effect on world economic markets, Viscount Lifford decided to reduce his business commitments to concentrate upon his duties as an executive director of Rathbone Bros.
SMG could continue to operate and manage the arena and Fox Sports could continue with their broadcasting rights, while I concentrate upon putting a competitive quality team on the ice for the fans.
And that led to Addison calling his players together on Friday to ask them to concentrate upon their football, rather than off-thefield affairs, until after Tuesday's match with Plymouth.
What I would like is to have a spell when I could just concentrate upon my boxing.
It stated: 'The delivery side of the chamber's training activities will concentrate upon encouraging new and emerging businesses with individual support for those starting up in business for the first time.
We have come to the decision that the best way to move this club forward is to concentrate upon giving Steve the money to improve his playing staff.
Each country that forms the suggested United Nations World Council for the prevention of all wars, should also concentrate upon their contribution of finance that maintains the existence and upkeep of the force.
With the wind in their favour after the break Eastbourne made Merthyr concentrate upon defending
Melville stressed Fulham had to put the uncertainty surrounding their next manager to one side and concentrate upon getting much-needed points again.
Keen to our management, with his marketing skill and familiarity with financial markets, will strengthen our company and allow George Van Derven to concentrate upon the recruiting, training and administration of our growing programmer resource pool.
During the course of the past 12 months, the focus for many small investors has been to strip out as much subjective comment as possible and concentrate upon what politicians like to refer to as ``real issues'', a horrible phrase, but appropriate here.