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The term spiral separator can refer to either a device for separating slurry components by density (wet spiral separators), or for a device for sorting particles by shape (dry spiral separators).
Spiral separators of the wet type, also called spiral concentrators, are devices to separate solid components in a slurry, based upon a combination of the solid particle density as well as the particle's hydrodynamic properties (e.g. drag). The device consists of a tower, around which is wound a sluice, from which slots or channels are placed in the base of the sluice to extract solid particles that have come out of suspension.
As larger and heavier particles sink to the bottom of the sluice faster and experience more drag from the bottom, they travel slower, and so move towards the center of the spiral. Conversely, light particles stay towards the outside of the spiral, with the water, and quickly reach the bottom. At the bottom, a "cut" is made with a set of adjustable bars, channels, or slots, separating the low and high density parts.
Efficiencyedit
Typical spiral concentrators will use a slurry from about 20%-40% solids by weight, with a particle size somewhere between 0.75—1.5mm (17-340 mesh), though somewhat larger particle sizes are sometimes used. The spiral separator is less efficient at the particle sizes of 0.1—0.074mm however.[citation needed] For efficient separation, the density difference between the heavy minerals and the light minerals in the feedstock should be at least 1 g/cm3;[1] and because the separation is dependent upon size and density, spiral separators are most effective at purifying ore if its particles are of uniform size and shape. A spiral separator may process a couple tons per hour of ore, per flight, and multiple flights may be stacked in the same space as one, to improve capacity.[2]
Many things can be done to improve the separation efficiency, including:
running the output of one spiral separator (often, a third, intermediate, cut) through a second.
adding washwater inlets along the length of the spiral, to aid in separating light minerals
adding multiple outlets along the length, to improve the ability of the spiral to remove heavy contaminants
adding ridges on the sluice at an angle to the direction of flow.[4]
Dry spiral separatorsedit
Dry spiral separators, capable of distinguishing round particles from nonrounds, are used to sort the feed by shape. The device consists of a tower, around which is wound an inwardly inclined flight. A catchment funnel is placed around this inner flight. Round particles roll at a higher speed than other objects, and so are flung off the inner flight and into the collection funnel. Shapes which are not round enough are collected at the bottom of the flight.
Separators of this type may be used for removing weed seeds from the intended harvest, or to remove deformed lead shot.
^"Shanchuan Heavy Industry Co, Ltd". Retrieved Dec 14, 2010.
^"Outotec separator selection guide". Retrieved Dec 14, 2010.
^"Fine Anthracite Coal Washing Using Spirals". May 2001.
^"alicoco mineral technology co, ltd". Retrieved Dec 14, 2010.
US Design of a take-off point for the extraction of dense material separated from a helical spiral separator. 922804, Wright, Douglas, "Spiral Separators", published 7. Jul. 1978, issued 19. Feb. 1980
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You can help expand this article with text translated from the corresponding article in Russian June 2010 Click show for important translation instructions View a machine translated version of the Russian article Machine translation like DeepL or Google Translate is a useful starting point for translations but translators must revise errors as necessary and confirm that the translation is accurate rather than simply copy pasting machine translated text into the English Wikipedia Consider adding a topic to this template there are already 1 187 articles in the main category and specifying topic will aid in categorization Do not translate text that appears unreliable or low quality If possible verify the text with references provided in the foreign language article You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation A model attribution edit summary is Content in this edit is translated from the existing Russian Wikipedia article at ru Vintovoj separator see its history for attribution You should also add the template Translated ru Vintovoj separator to the talk page For more guidance see Wikipedia Translation The term spiral separator can refer to either a device for separating slurry components by density wet spiral separators or for a device for sorting particles by shape dry spiral separators Drawing of a spiral separator Contents 1 Wet spiral separators 1 1 Efficiency 2 Dry spiral separators 3 See also 4 References and further readingWet spiral separators editSpiral separators of the wet type also called spiral concentrators are devices to separate solid components in a slurry based upon a combination of the solid particle density as well as the particle s hydrodynamic properties e g drag The device consists of a tower around which is wound a sluice from which slots or channels are placed in the base of the sluice to extract solid particles that have come out of suspension As larger and heavier particles sink to the bottom of the sluice faster and experience more drag from the bottom they travel slower and so move towards the center of the spiral Conversely light particles stay towards the outside of the spiral with the water and quickly reach the bottom At the bottom a cut is made with a set of adjustable bars channels or slots separating the low and high density parts Efficiency edit Typical spiral concentrators will use a slurry from about 20 40 solids by weight with a particle size somewhere between 0 75 1 5mm 17 340 mesh though somewhat larger particle sizes are sometimes used The spiral separator is less efficient at the particle sizes of 0 1 0 074mm however citation needed For efficient separation the density difference between the heavy minerals and the light minerals in the feedstock should be at least 1 g cm3 1 and because the separation is dependent upon size and density spiral separators are most effective at purifying ore if its particles are of uniform size and shape A spiral separator may process a couple tons per hour of ore per flight and multiple flights may be stacked in the same space as one to improve capacity 2 Many things can be done to improve the separation efficiency including changing the rate of material feed changing the grain size of the material changing the slurry mass percentage 3 adjusting the cutter bar positions running the output of one spiral separator often a third intermediate cut through a second adding washwater inlets along the length of the spiral to aid in separating light minerals adding multiple outlets along the length to improve the ability of the spiral to remove heavy contaminants adding ridges on the sluice at an angle to the direction of flow 4 Dry spiral separators editDry spiral separators capable of distinguishing round particles from nonrounds are used to sort the feed by shape The device consists of a tower around which is wound an inwardly inclined flight A catchment funnel is placed around this inner flight Round particles roll at a higher speed than other objects and so are flung off the inner flight and into the collection funnel Shapes which are not round enough are collected at the bottom of the flight Separators of this type may be used for removing weed seeds from the intended harvest or to remove deformed lead shot See also editScrew conveyor Cyclone separator Sieve Mineral processing Mechanical screeningReferences and further reading edit Shanchuan Heavy Industry Co Ltd Retrieved Dec 14 2010 Outotec separator selection guide Retrieved Dec 14 2010 Fine Anthracite Coal Washing Using Spirals May 2001 alicoco mineral technology co ltd Retrieved Dec 14 2010 US Design of a take off point for the extraction of dense material separated from a helical spiral separator 922804 Wright Douglas Spiral Separators published 7 Jul 1978 issued 19 Feb 1980 Retrieved from https en wikipedia org w index php title Spiral separator amp oldid 1122258281, wikipedia, wiki, book, books, library,
