Material washing system and apparatus

Patent metadata

Field	Value
Publication number	US-2022016636-A1
Application number	US-202117377679-A
Country	US
Kind code	A1
Filing date	Jul 16, 2021
Priority date	Jul 20, 2020
Publication date	Jan 20, 2022
Grant date	—

Abstract

A washing apparatus comprises a screening apparatus having a first screening deck located below a second screening deck, wherein the first screening deck passes material that is larger than the material passed by the second screening deck. A liquid delivery system delivers liquid onto the first screening deck to wash material on the first deck. Material that passes through the first deck is conveyed upwards and delivered onto the second deck for dewatering. The apparatus is able to wash and dewater aggregate material in a single unit with a relatively small footprint and relatively high throughput.

First claim

1 . A washing apparatus comprising:
a screening apparatus having a first screening deck configured to pass material of up to a first particle size, and a second screening deck configured to pass material of up to a second particle size; and a liquid delivery system configured to deliver liquid onto the first screening deck,
wherein the second screening deck is located above the first screening deck, and wherein said first particle size is larger than said second particle size.

2 . The washing apparatus of claim 1 , further including, or being co-operable with, means for conveying material that passes through said first screening deck to said second screening deck.

3 . The washing apparatus of claim 1 , wherein said first screening deck has a feed inlet, a discharge outlet spaced apart from said feed inlet in a longitudinal direction, and a screen located between said feed inlet and said discharge outlet, and wherein said second screening deck has a feed inlet, a discharge outlet spaced apart from said feed inlet in the longitudinal direction, and a screen located between said feed inlet and said discharge outlet.

4 . The washing apparatus of claim 3 , wherein said first and second screening decks are aligned with each other such that they overlap in the longitudinal direction and in a transverse direction that is perpendicular to the longitudinal direction.

5 . The washing apparatus of claim 3 , wherein said liquid delivery system comprises at least one liquid delivery device, preferably comprising at least one spray device configured to spray liquid onto the screen of said first screening deck, and is preferably located above said screen of said first screening deck.

6 . The washing apparatus of claim 5 , wherein said at least one spray device comprises a plurality of spray devices spaced apart in said longitudinal direction between the feed inlet and the discharge outlet of the first screening deck.

7 . The washing apparatus of claim 3 , wherein said at least one spray device comprises a plurality of spray nozzles spaced apart in the transverse direction.

8 . The washing apparatus of claim 3 , wherein the screen of said second screening deck is inclined upwardly from the feed inlet of said second screening deck to the discharge outlet of said second screening deck.

9 . The washing apparatus of claim 3 , wherein said second screening deck comprises a drain at the feed inlet.

10 . The washing apparatus of claim 9 , wherein said drain is configured to drain liquid from said second screening deck onto said first screening deck.

11 . The washing apparatus of claim 9 , wherein said drain comprises a screen section extending upwardly from the screen of said second screening deck.

12 . The washing apparatus of claim 3 , wherein at least one liquid-guiding channel structure is located beneath the screen of the second screening deck, said at least one liquid-guiding channel structure having at least one inlet for receiving liquid that passes through the screen of the second screening deck, and at least one outlet for delivering liquid to the first screening deck.

13 . The washing apparatus of claim 12 , wherein said at least one liquid-guiding channel structure is configured to guide liquid towards the feed inlet of said second screening deck, and wherein, preferably, said at least one outlet is located above the feed inlet of the first screening deck.

14 . The washing apparatus as claimed in claim 12 , wherein said at least one liquid-guiding channel structure is inclined downwards in a direction from the discharge outlet of said second screening deck to the feed inlet of said second screening deck.

15 . The washing apparatus of claim 12 , wherein said at least one liquid-guiding channel structure comprises a tray.

16 . The washing apparatus of claim 12 , including a liquid delivery system configured to direct liquid onto said at least one channel structure to flush material towards said at least one outlet.

17 . The washing apparatus as claimed in claim 3 , wherein a dam is provided at the discharge outlet of the second screening deck.

18 . The washing apparatus of claim 1 , further including a vibratory drive system coupled to said screening apparatus for imparting vibratory movement to said first and second screening decks.

19 . The washing apparatus of claim 18 , wherein said vibratory drive system is configured to impart vibratory movement to said first and second screening decks that moves material on the respective screens in a direction from the respective feed inlet to the respective discharge outlet.

20 . A washing system comprising a washing apparatus as claimed in claim 1 , wherein the washing system further comprises conveying means for conveying material that passes through said first screening deck to said second screening deck,
and wherein said washing system optionally includes a sump, preferably located beneath said first screening deck, for receiving material that passes through the first screening deck, and wherein said conveying means is configured to convey material from said sump, and wherein said conveying means optionally comprises either one or both of:
a pump system comprising at least one pump and at least one conduit;
a liquid-solid separating device, preferably comprising one or more hydrocyclone,
and wherein said washing system optionally includes feeding means, typically comprising a feed receptacle, arranged to feed material to the first screening deck, and wherein said washing system optionally includes a respective output apparatus for receiving material from the first and second screening decks, wherein each output apparatus may comprise a chute and/or a conveyor.

Assignees

• Terex Gb Ltd

Inventors

• Haslett Steven
• Patterson Johnston

Classifications

• B07B1/55 Primary

  with fluid jets · CPC title

• B03B7/00

  Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage · CPC title

• B03B5/00 Primary

  Washing granular, powdered or lumpy materials; Wet separating (separating by pneumatic tables or by pneumatic jigs B03B4/00) · CPC title

• B07B2230/01

  Wet separation · CPC title

• B03B5/02

  using shaken, pulsated or stirred beds as the principal means of separation (B03B5/28, B03B5/48 take precedence) · CPC title