Widespread wet options in mobile washing plants

Pecisionscreen, which has numerous national outlets, has outlined the benefits of its wash plant inventory, which includes the SRD240x mobile dewaterer, the SRD180 dewaterer, the Super Reclaimer 1050 wet screen and the Barrel Washer. Precisionscreen is also offering wash kits that will transform its dry screen models to rinsing screens, and offering similar conversions to its range of Sandvik mobile tracked dry screens.

Mobile dewaterers

{{image2-a:r-w:300}}The SRD240x is an all-in-one wash plant, boasting all components required for processing sand products, while the SRD180 is capable of manufacturing coarse and fine grade sand simultaneously, and even a super fine product if desired.

The SRD240x has been designed to provide a mobile solution for new and existing sand washing projects. The roadworthy, towable chassis allows the plant to be easily moved via prime mover, with the set-up costs normally associated with sand washing plants being minimal.

The SRD240x requires a clean water source supplied to the four-inch inlet manifold for the washing screen deck, and a 12-inch wastewater pipe discharging from the machine to a settlement pond. The machine is packed full of features that make it the perfect tool for effectively testing the material cost to an operator’s goals. It comprises:
• An 8’ x 5’ two-deck wash screenbox.
• Dual bucket wheels.
• The ability to make three different sand fractions in one pass.
• A vibrating dewatering screen deck. 
• A 50m weir area.
• A submerged screw.
• A 12-inch cyclone.
• An on-board power pack.
• A roadworthy, towable chassis.

The unique submerged back screw available on the SRD180 dewaterer greatly assists in floating off organic silts, and allows for an enormous effluent water overflow area that ensures excellent dewatering capacity.

The unique polyurethane bucket inserts assist in the low maintenance and efficient dewatering.

Wet screen

The Super Reclaimer 1050 is the largest of the “conventional” wash screening plants currently manufactured by Precisionscreen.

It features 1200mm wide belts (feed and main) and a 10’ x 5’ two-deck, fully floating efficient screenbox. The wash kit includes a boiler box with spray bar at the end of the conveyor to wash the aggregate before it enters the screenbox, followed by a two-deck wash kit with coarse nozzles on the top deck and fine nozzles on the bottom deck. This is a high production sand plant that can work in conjunction with the SRD180 dewaterer or sand screw. Its features include:
• A large hopper capacity – 8.5m3.
• A 1200mm main and feed belt.
• A 10’ x 5’ two-deck screenbox with rinse kit.
• The ability to make two different sand products in one pass.
• A triple-deck option to wash decorative stone.

Barrel washer

The Precisionscreen Barrel Washer designed to scrub and clean natural pebble so it can be sold as decorative stone to landscape yards. The Barrel Washer circuit consists of an open feed hopper with variable speed belt and control gate to regulate material flow. As the bin has an open style, the feed material must be pre-screened, with a top size of 150mm (ideal feed size is minus 50mm).

Various size stakers can be used to stockpile the finished product and can be set-up in the radial wheel motion, so bins can be made for the different size rock products. The Barrel Washer is equipped with the following features:
• An inlet feed box with water fitting.
• A 4m x 1.5m diameter closed barrel length.
• 12 internal lifters.
• A 10mm rubber lining.
• A barrel variable speed of one to 10 revolutions per minute.
• A discharge chute with wear liners.
• A heavy duty skid frame.
• Four independent hydraulic drive wheels for the barrel.
• A 2.4m long mesh trommel attached to the enclosed barrel for draining and final wash.
• An internal spray bar up the middle of the entire barrel to assist with cleaning.
• A spray bar on the outside of the trommel mesh to help keep it clean.

Wash decks

Precisionscreen can adapt the Sandvik tracked screening range from a dry to a wet process by adding the renowned Precisionscreen Rinse Kit.

The top deck of the screenbox has a number of spray bars (depending on the size of the screenbox), each with its own coarse nozzles. There is one manifold that supplies the spray bars, controlled by a two-inch brass gate valve positioned at the inlet end of each spray bar. This allows individual control over the flow to each spray bar and the choice to shut them off if necessary.

The bottom deck has the same number of spray bars, with 20 nozzles positioned at different angles along the bar for even dispersion and a finer blade of water.

The spreader plate before the screenbox is replaced with a boiler box, with one spray bar and an inlet hose. This is designed to help slurry up the material before it heads to the screenbox.

There is an underscreen bladder to collect the water/slurry coming down from the screen, which funnels the material out the discharge pipes and onto the next stage for dewatering the sand. This plant can be converted back to a dry screening plant with minimal fuss by simply removing the internal bladder. The original fines conveyor does not need to be removed when washing if this option is chosen.

Alternatively, the fines conveyor can be removed and a steel wet funnel box can be added in its place if preferred.

Wash kits

Precisionscreen’s wash kits range from the single deck “sling on” type for rinsing operations to sophisticated two- or three-deck wash kits built into the screenbox. Typically, each deck will have multiple spray bars fitted, with numerous spray nozzles best suited to the duty of the screen deck and the product being processed. Fine control is available via individual gate valves to each bar.

Rinse kits are designed for all Precisionscreen screenboxes – both static and mobile – which include 6’ x 4’, 8’ x 4’, 10’ x 5’, 12’ x 5’ and 20’ x 5.

Source: Precisionscreen.


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