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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 ?
In the tests, the AXN Multiservice IP Concentrator served as a central office gateway to the public-switched telephone network (PSTN), including Ericsson local-exchange voice switches.
The addition of StoneFly's Storage Concentrators provides intelligent iSCSI storage packet routing technology for the delivery of high-performance networked storage over IP, and storage provisioning for centralized data management at a significantly lower cost.
The CopperRocket 201 interoperates with the widely deployed CopperEdge DSL concentrator and CopperView(TM) network management system, and works efficiently with IP, IPX, SNA, or legacy LAN protocols for smooth integration into any network.
Traffic from one office suite cannot pass to another via bridging, as the access concentrator controls access at the frame-relay or IP-switching level.
WARSAW, Poland -- Lucent Technologies (NYSE: LU) announced today that it has delivered its 2500th Stinger(R) DSL broadband access concentrator to Telekomunikacja Polska (TP) to support its nationwide neostrada tp and internet DSL tp broadband access offers for individual and business subscribers.
The company's complete line of Storage Concentrators combine the functionality of an iSCSI- based storage router, bridge and a powerful provisioning engine to enable the rapid implementation of easy-to-use, highly cost-effective Scalable IP SANs.
In less than 15 minutes, Storage Concentrators turn standard IP networks into intelligent IP storage networks that support existing applications and traffic to provide customers with the ability to optimize storage resources as well as the scalability to handle growing storage requirements.
Both customers are using Seranoa's IPeX Service Edge Concentrators to aggregate IP business subscribers, streamline and simplify network operations, and deliver increasingly popular IP business services.
HP's computational cluster program team has selected Interphase as the sole supplier of FDDI concentrators to our workstation clusters based on the outstanding performance levels and modular design of the M800," said Mark Pacelle, program manager for computational clusters at HP's Workstation Systems Group.
Designed specifically to support voice, video and high-speed data, Paradyne's Broadband Access Concentrators support:
Using synchronous cabling, the C/CON-16 concentrators can be located as far as 4,000 feet from the host.