sluice

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sluice

1. a channel that carries a rapid current of water, esp one that has a sluicegate to control the flow
2. the body of water controlled by a sluicegate
3. See sluicegate
4. an artificial channel through which logs can be floated
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Sluice

 

in ore dressing, an inclined, rectangular trough, usually with a rough bottom of napped fabric covered with a pattern of wood planks, corrugated rubber, or the like, designed for gravity concentration of minerals. As the pulp passes through the sluice, the particles separate into layers according to their density and grain size; the heavier minerals settle to the bottom and are held by the friction created by the roughness and the bottom pattern. The vortices that form promote selective concentration. After the material has accumulated, the sluice is rinsed out by washing the concentrate into a separate receptacle with a powerful stream of water.

A distinction is made between fixed and band-type sluices. Fixed hydraulic sluices are designed to process large amounts of material. They are made of from six to eight consecutively laid boards several meters long with a slope of 0.03–0.06. They can extract 70–80 percent of the tin from ore concentrates containing 15–30 percent SnO2; the extraction of gold is 40–60 percent. Other sluicing devices, cradles, and trommels are used for processing crude concentrates.

Band-type sluices consist of a continuous rubberized band, the upper part of which moves against the stream of pulp. The lighter fraction is unloaded in the lower section, and the heavier fraction is washed from the upper section of the band by a sprinkler. A band-type sluice 3 m long and 1.5 m wide has a productivity of 5 cu m/hr and can extract 92–95 percent of the gold in an ore.

Automatic multideck movable sluices have been in use since the 1970’s. The type used in the USSR has five decks arranged in parallel above one another in tiers. The feed is stopped automatically every 4 min, the decks are tipped to an angle of 45°, and a petcock is opened for 1 min for rinsing. The use of vibration in sluices increases productivity.

REFERENCE

Spravochnikpo obogashcheniiu rud, vol. 2, part 1. Moscow, 1974.

L. A. BARSKII

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

sluice

[′slüs]
(civil engineering)
A passage fitted with a vertical sliding gate or valve to regulate the flow of water in a channel or lock.
A body of water retained by a floodgate.
A channel serving to drain surplus water.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The newer dams did not have integral ice and trash sluiceways, so the orifices emptied into conduits mined within the dams that channeled water to a release site in the tailrace of the dam.
He also confirmed earlier findings from sluiceway studies at Bonneville Dam that most juveniles passed into the turbines between dusk and dawn.
Although the dam had an ice and trash sluiceway to facilitate moving ice and trash to the tailrace of the dam, the debris nonetheless had already shown a propensity to move into gatewells.
5) Would fish diverted into the gatewell readily find the submerged orifices and pass into the ice and trash sluiceway? (OPE), and
Little apparent mortality or descaling occurred on fish transiting the sluiceway after passing through orifices.
Also in 1976, studies began to evaluate the survival of fish that passed through the gatewell orifices into the ice and trash sluiceway, which emptied in the tailrace of McNary Dam (Sims and Johnsen (25)).
Although the decision had been made to move forward with STS at all dams, in 1981 at the Bonneville First Powerhouse one last effort to evaluate the feasibility of a possible alternative to STS was considered: To open gates on the ice and trash sluiceway to create a surface flow into the sluiceway that would attract fish into it as they approached the powerhouse rather than milling around in surface waters during daylight conditions before passing downward into the turbine intakes in the evening hours.
At Bonneville Dam First Powerhouse, adjustable-angle STS initially tested at McNary Dam in 1979 were evaluated in Turbine Unit 4 against fish passing into the ice and trash sluiceway (Krcma et al.
The FGE was generally 2-times greater compared to fish passing through sluicegates into the ice and trash sluiceway. Because it appeared that the adjustable-angle STS was a workable option, no additional research was scheduled for the next year, and the process of developing designs for installation of STS in all the turbines at Bonneville Dam First Powerhouse was started.
Deep in the dam's innards, I stood over an enormous sluiceway, spellbound by the whirling shaft of a turbine as big as a house.
A sluiceway was built around such obstacles to get the logs through.