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

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

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.
References in periodicals archive ?
POUR LOSER Lee Goddard admitted opening sluice gate
Once we have these sluice gates fixed, it will allow us to de-silt the millpond.
Furious residents living upstream of the Khlong Sam Wa canal earlier tried to forcibly raise the sluice gate and demanded that the authorities ease flooding in their communities by channeling more water through the canal.
Asked who controlled the sluice, Rajapakse said that ''We are around it,'' while the LTTE said government troops were ''close to the sluice gates.
Although the building of the dam is seen as an important step in the regeneration of Mozambique, the rangers believe that the addition of the sluice gates represents a huge threat.
Jordan, of Callander, had denied culpably and recklessly endangering life by opening the three sluice gates on July 12 last year.
But the Environment Agency said the sluice gates prevent the floods from being even worse.
This aspect of the disaster has finally drawn the government's attention, and after much official hand-wringing, a compromise decision was made to open the two sluice gates near the ends of the dike to allow the waters of the bay into the area originally designated as the freshwater catchment reservoir.
If they blew the dam's sluice gates, the released waters would flood the valley and stop further UN advances.
I heard that after the opening of sluice gates the sea environment improved in a similar reclamation site in South Korea.
Environment officers put oxygen into the river and sluice gates were opened to disperse the cream into the sea.
In their haste to meet official targets for water storage, hydrological planners of the 1950s took questionable shortcuts on dam design, such as reducing the number of sluice gates - openings through which excess water can be released.