sluice

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Related to sluices: sluice gates

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 ?
Given that sluices occur almost four times as often in the translated texts as in the authentic ones, the Latin option seems more plausible.
For OE sluices, we do have to alternate between syntactic and semantic solutions, be it only to capture a minority of cases, If we so cast ellipsis into diachronic mode, the PDE facts fall into place; there is a lot of syntax in sluicing, there is some semantics, and finally there Is pragmatics.
Below, I consider another point frequently made about sluicing--namely, that embedded sluices typically trigger less violation of structural identity than do non-embedded ones.
An asymmetry between embedded and non-embedded sluices
Naturally, a syntactic approach better accounts for embedded sluices, which see a reduction in the number of the recalcitrant instances; it will lose ground as soon as a linguist crosses sentential boundaries to accommodate non-embedded sluices.
We have already seen that the shift from Early to Late OE interacts with an increased frequency of sluices.
I conclude that there is early evidence indicating that syntactic licensing is overwhelmingly more often required for embedded sluices than for non-embedded ones, and if that is so, then no syntactic accounts constrained by sentential bounds are straightforwardly wrong.
The data suggest that many records of sprouting, because of the rule's pronounced sensitivity to nonembedded sluices, may have been missed by those linguists who have never reached beyond embedded sluicing.
3) The search itself determined sluices by applying the category of a stranded wh-phrase.
Culicover and Jackendoff 2005), a fact straightforwardly captured on a theory that projects syntactic reconstruction of a sluice.